Chevrolet 17122490 Lifter,Valve

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Keep lifters and pushrods in order! This is absolutely necessary for installation, since these parts have differences which could result in engine damage if not installed in their original positions! Remove intake manifold, valve covers, rocker arm assemblies and pushrods. Remove the valve lifter guide retainer bolts, the retainer guides and valve lifters. Disassemble by removing the retainer ring with a small screwdriver, pushrod seat and oil metering valve, plunger and plunger spring, and check valve retainer from plunger, then remove valve and spring. After lifters are disassembled, all parts should be cleaned in clean solvent. A small particle of foreign material under the check valve will cause malfunctioning of the lifter. Close inspection should be made for nicks, burrs or scoring of parts. If either the roller body or plunger is defective, replace with a new lifter assembly. Whenever lifters are removed, check as follows: Roller should rotate freely, but without excessive play. Check for missing or broken needle bearings. Roller should be free of pits or roughness. If present, check camshaft for similar condition. If pits or roughness are evident replace lifter and camshaft. Assemble by coating all lifter parts with a coating of clean kerosene or diesel fuel. Assemble the ball check, spring and retainer into the plunger. Install plunger spring over check retainer. Hold plunger with spring up and insert into lifter body. Hold plunger vertically to prevent cocking spring. Submerge the lifter in clean kerosene or diesel fuel. Install oil metering valve and pushrod seat into lifter and install retaining ring. Prime new lifters by working lifter plunger while submerged in clean kerosene or diesel fuel. Lifter could be damaged when starting engine if dry. When a rocker arm is loosened or removed, valve lifter bleed down is required. Lifters must be bled down as possible valve to piston interference due to the close tolerances could exist. Before installing a new or used lifter in the engine, lubricate the roller and bearings of the lifter with No. 1052365 lubricant or equivalent. Install lifters and pushrods into original position in cylinder block. Install manifold gaskets and manifold. Position rocker arms, pivots and bolts on cylinder head. Install valve covers. Install intake manifold assembly.

To isolate a noisy valve lash adjuster, place a length of hose or tubing near each valve while listening at the other end, or remove the rocker arm cover and touch each valve spring retainer with the engine idling; a defective lash adjuster will be evident from the shock felt at the retainer. The most common cause of noise is dirt trapped between the plunger and lash adjuster body. Begin by removing the rocker arm cover, then loosen both rocker arm bolts at the cylinder with the noisy lash adjuster and rotate the rocker arms away from the pushrods. Next, remove the pushrod guides and pushrods, followed by the pushrod cover. Unscrew the locknuts on the pushrod cover studs to remove the lash adjuster guide, keeping the guides in order if multiple are removed. Lash adjuster extraction can be done with a special tool, a small magnet, or fingers on newer engines without varnish buildup; avoid using pliers unless replacing the lash adjuster. Store lash adjusters in a labeled box to ensure proper reinstallation. Clean the lash adjusters with solvent and check for wear; if the base is concave or damaged, replace the entire set. If new lash adjusters are installed, a new camshaft must also be used, and never install used lash adjusters unless the original camshaft is reused. For roller lash adjusters, check for wear and ensure they turn freely. Used roller lash adjusters can be reinstalled with a new camshaft. When installing used lash adjusters, ensure they are placed in their original positions and coat them with moly-base grease or engine assembly lube. Lubricate the bearing surfaces of the lash adjuster bores with engine oil, then install the lash adjusters with the oil orifice facing the front of the engine. Follow with the installation of the lash adjuster guides and retainers, then the pushrods, pushrod guides, rocker arms, and rocker arm retaining bolts, ensuring each pair of lash adjusters is on the base circle of the camshaft before tightening. Finally, tighten the rocker arm bolts to the specified torque and reinstall the pushrod cover and rocker arm cover.

Begin with taking off the camshaft by unscrewing or unbolting the rocker arms, push rods, intake manifolds, timing chains, cam sprocket and balance shaft drive gear; in addition, you may have to do away with such things as fan radiator and condenser. Place the lash adjusters in a labeled box and disconnect the lash adjuster retainer. A special tool can be employed together with magnet or even your fingers to extract the lash adjusters from their bores. Remove the camshaft retainer plate and use three 6-inch long, 5/16-18 bolts as a handle to remove the camshaft from block. When inspecting clean lash adjuster & cam shaft using solvent checking for wear on both of them. The journals as well as cam lobes should be checked for wear. Measure. If its damaged then it must be replaced along with bearings. To lubricate bearing journals and cam lobes with assembly lube, the camshaft will finally slide into engine during installation. Fix other parts like this: install that thrust plate for a Cam Shaft; balance shaft drive gear plus also timing chain & sprockets. Lubricate lash adjusters using clean engine oil then fix them within block. The rest of installation is opposite to that of removing these components. Cooling system should be refilled at last because we are starting again after changing an engine oil filter. Finally start engine (run) and check there are no leaks.

To take off the camshaft, first disconnect the cable from the negative battery terminal and release fuel system pressure. From there on, remove; radiator, auxiliary automatic transmission fluid cooler (if equipped), power steering cooler, air conditioning condenser, valve covers, intake manifold, rocker arms, pushrods, timing chain and sprockets, and cylinder heads. Before you remove the lifters arrange to store them in a labeled container. Remove lash adjusters and camshaft retainer plate using a bolt as a handle to carefully pull out camshaft. To check out the camshaft measure lobe height and base circle for lobe lift determination; compare with specifications and replace the camshaft if necessary. Check the camshaft bearing journals for wear or damage; use a micrometer to measure them. Inspect the camshafts lobes for discoloration; score marks; chipped areas; unalike wear. Clean and inspect lash adjuster bodies for damage, wear and proper roller function. Put in place by lubricating bearing journals and lobes with assembly lube before sliding it into the engine, securing it with the Cam Thrust Plate. Install timing chain and sprockets , camshaft position sensor, lash adjusters As well as this refill cooling system, change oil, new oil filter installation precede start up-run engine process.

Rocker arms can be pivoted away from the pushrods by removing the valve covers and loosening the rocker arm nuts before removal to measure camshaft lobe lift. The plunger on a dial indicator is to be positioned directly above the first pushrod, which is mounted on the engine. Disconnect the engine's electrical connectors from the distributor. Rotate the engine very slowly until it comes to rest with this pushrod sitting against its lowest point (base circle of camshaft lobe) then zero dial readout. As an effect of rotating crankshaft in normal direction indicator needle reaches its highest peak and starts reversing showing maximum cam lobe lift. Write this down and make check for all lobes comparing results obtained. If cam lobe lift is 0.003 inches less than specified, there will be a need for new camshaft installation since there has been a wear out of cam lobe. Also, remove fan shrouds, fan, radiator and condenser if applicable. Carefully remove them while properly labeling and storing before lifting off Lash Adjuster retainer. One must always be careful never to try to extract a camshaft with the Lash Adjusters left inside. Lash Adjuster removal from bores can also take different directions depending on what one wants to do next or how many Lash Adjusters are being replaced at once or maybe whether one has no other option but replace all of them because they are so bad that individual replacement would not solve anything here otherwise there could be no further discussion where others may simply call for removal with every other thing remaining intact Some other methods may include using tongs or pliers etc., By holding onto this chain while forcing it outwards (meaning our efforts are aimed at removing without damaging crankcase bearings which are located near bottom part). At this juncture, note carefully how two torx screws have been used here as well as appropriate directionality provided by manufacturer themselves. Three 6-inch long, 5/16-18 bolts can be threaded into the camshaft sprocket bolt holes to serve as handles when pulling on the camshaft, thus preventing any possible damage to bearings straight out. During an examination, there are several features that indicate damage in form of wear of cam lobes and bearing journals. Obtain a micrometer and take measurements of each cam journal's diameter and also determine height of every cam lobe using these results compared against appropriate tolerances. Should any journal have a diameter less than what it ought to be, then replace the particular camshaft. The procedure for changing these bearings is normally outsourced to automotive machine shops due to difficulties involved since they use specific tools and are manned by experts in this field. Once again, lubricate both camshaft bearing journals along with the cams lobes utilizing assembly lube meant for these parts, then gently slide it into block without damaging those sensitive lower ends of crankcase bearings near mounting points near crankcase face. As soon as position (dowel pin) after pivoting cylinder head in clockwise direction has been reached (that means 3 o'clock), lock it through tightening the thrust plate. By aligning dowel pins also confirming position of balancer shaft timing marks install balance shaft drive gear accordingly. Next, install the timing chain and gears in their right place using clean engine oil on Lash Adjusters when returning them into their respective bores because old Lash Adjusters may be reused if one is not installing new cams together with new Lash Adjusters too as was mentioned above or which case always follows after changing some worn out stock ones Finally, do everything else you did back but change oil before starting engine and put another filter.

Before removing the camshaft, test the lobe lift to verify how much wear has occurred on the cam lobes. First, set number one piston at TDC on compression stroke. Then loosen rocker arm nuts and pivot the arms sideways. Thereafter fit a dial indicator over the engine, and set its stem touching top of first pushrod. Zero 0 Dial Indicator as well as slowly rotate crankshaft in normal direction until needle of indicator stops and begins to move in opposite way. Record this reading then replicate for every other valve. Where the maximum value of cam lobe lift is below that specified, install a new camshaft. Take off the intake manifold, rocker arms, push rods, timing chain and cam sprocket from the head prior to removing it from cylinder block; unfasten balancer shaft drive and driven gears if any; draw out camshaft very cautiously holding it at near block area; after removal look up bearing journals if they were worn out or damaged; inspect with micrometer bearing surfaces for increased clearances or ovality conditions; also review cams for discoloration as well as scoring marks being present; wash out lash adjusters and verify them under light projections or even examining several pittings or variable wear patterns; take off old gear roller followers too when replacing lobes including wipers along with it only; check rollers on roller type Lash Adjusters for wear/scoring/any damage that might be noticed therefrom/moly based grease/lube oil between lobes besides journals/insert nozzle into a hole (where not abraded), which must be careful at all costs not to scrape groove bearings. Next Lubricate all journals both lateral zones plus lopes with molly base greases or assembly compounds intended strictly for engines respectively: insert executive's element without scratching related beds but before enjoying harmonic aspect together by looking whether matching bones actually are still available plus need refitting them again: finally, oil changes should chiefly concern replacement of filters too then engine run on.

The camshaft should always be checked well for any signs of damage before it is fitted and the end play must, however, be checked before the removal of the camshaft. To discern cam lobe wear look at the lobe lift before pulling the camshaft out; remove the valve covers first and be sure that the number one piston is at top dead center on the compression stroke. Remove the lock nut underneath the rocker arm and turn the rocker arm to the side to allow the use of the dial indicator which is fixed on the engine with the plunger on top of the first push rod. Rotate the crankshaft until the pointer of the dial indicator touches zero and then rotate the crankshaft slowly until the needle of the dial indicator withdraws reversing its direction and gets the maximum cam lobe lift. Do this for each valve and be sure that each piston is at the top dead center on the compression stroke. If the lobe lift is low compared to the specified values, the car requires a new camshaft to be fitted. On versions up to 2014, separate the intake manifold, rocker arms, pushrods, timing chain, and camshaft sprocket, and then use the right tools to get the Lash Adjusters out and place them in the boxes that show their position for reinstallment. Camshaft and bearings should be checked for signs of wear, pitting, and any other sign of damage while checking the bearing journals with a micrometer. Remove and inspect conventional Lash Adjusters for wear, they should be slightly crowned; if any are depressed or badly worn, replace them with new Lash Adjusters and camshaft. Regarding roller Lash Adjusters, they should be checked for the ability to rotate smoothly to the surface of the cylinder bore and for excessive wear. Lubricate the camshaft and as for the installation; slide the camshaft into the engine and rotate it until the dowel pin is in the correct place. On 2018 and later models, before removing the camshaft and Lash Adjusters, the air conditioning system must be discharged and the fuel pressure reduced, the cooling system must be drained, and some components must be unbolted. Make sure that oil is put on the camshaft and Lash Adjusters when installing, align and snug torque the camshaft and Lash Adjusters and then bolt the rest in a reversal of the removal process. One must ensure the cooling system is full, the oil is new and must have changed the oil filter before starting the engine.

Before taking out the camshaft, measure the lobe lift to ascertain the extent of cam lobe wear. Put number one piston at TDC on compression stroke. Then open the rocker arm nuts by loosening up the valve cover to access pushrods. A dial indicator should be set up on the engine and a plunger placed against the top of the first pushrod. Zeroing will then follow and this can be done by turning crankshaft slowly in the normal direction of rotation until it reaches its maximum lobe lift position which shows that it has fully opened. Note down this measurement and repeat for other valves. If cam lobes have been worn down below specified limits, mount a new camshaft. To test for noisy lash adjuster, use a mechanic's stethoscope or a length of hose near each valve while listening for excessive clearance in valvetrain. Any defective lash adjuster is identified through noise produced. This requires removing cylinder head to remove lash adjusters. The removal tool used may either be magnet or scribe but lash adjuster guides help in separating them from the cylinder head. These are then washed and checked whether they have score marks, uneven wear and scuffing too. In addition, inspect rollers for damage or wear and replace them if necessary. To pull out a camshaft one should remove front cover with timing chains as well as sprockets on them; there will also need removal bolts together with oil pump drive as well as thrust plate of camshaft before you carefully withdraw it from block after which bearing journals are cleaned and examined for any destructions; size of bearing journals and camshaft lobes measured where obvious inspection of lobes revealing discoloration, score marks, chipped areas pitting, deformation etcetera indicates that they can no longer serve while some other good conditions along with correct measurements will allow further utilization thus lubricating these components such as bearing journal alongside their respective lobes through assembly lube should be done in a way that it easily slides into the engine after which thrust plate is put back with its bolts tightened while oil pump drive is reinstalled thus where lash adjusters are still intact, they may be reinstalled at their original locations and then coated using assembly lube. On the other hand, lash adjuster bores are also lubricated by engine oil prior to installing them whereby; pushrods as well as pushrod guides should be positioned while rocker arms together with rocker arm retaining nuts are tightened.

A noisy lash adjuster can be located in the same manner, or, while the engine is idling, remove the valve cover and rap on each valve spring retainer to feel the shock if there's a bad adjuster for it. Rough adjusters are usually as a result of dirt accumulation in the adjuster gallery and low oil supply; the oil should therefore be tested for contaminants, quantity, cleanliness and quality before attributing a rough idle to ruinous adjusters. Adjusters must be uninstalled by first often the intake manifold and the valve cover and then by taking off the rocker arms and pushrods together with the bolts, which secure the roller adjuster guides to the block. The adjusters on most of the engines can be removed by using a special tool, small magnet or fingers, especially on the newer models but pliers should not be used if not replacing them as this causes damage. Pack the adjusters, that should be reused during assembly, into a box marked with their placement so as to guarantee correct assembly, and decontaminate them with solvent, checking if they are scratched. Given that parts for lash adjusters cannot be bought separately, the process of removing them in case cleaning does not work is more Herculean than the need to repair the part. On reassembly ensure that adjusters are put back to their original bores, new adjusters should be dipped in oil, all should be coated with moly-base grease or engine assembly lube before the pushrods and the rocker arms are fitted. The other steps of installation are done in the reverse order of teardown and after everything is put back into place start the engine and look for signs of oil leakage.

A noisy lash adjuster can be located in the same manner, or, while the engine is idling, remove the valve cover and rap on each valve spring retainer to feel the shock if there's a bad adjuster for it. Rough adjusters are usually as a result of dirt accumulation in the adjuster gallery and low oil supply; the oil should therefore be tested for contaminants, quantity, cleanliness and quality before attributing a rough idle to ruinous adjusters. Adjusters must be uninstalled by first often the intake manifold and the valve cover and then by taking off the rocker arms and pushrods together with the bolts, which secure the roller adjuster guides to the block. The adjusters on most of the engines can be removed by using a special tool, small magnet or fingers, especially on the newer models but pliers should not be used if not replacing them as this causes damage. Pack the adjusters, that should be reused during assembly, into a box marked with their placement so as to guarantee correct assembly, and decontaminate them with solvent, checking if they are scratched. Given that parts for lash adjusters cannot be bought separately, the process of removing them in case cleaning does not work is more Herculean than the need to repair the part. On reassembly ensure that adjusters are put back to their original bores, new adjusters should be dipped in oil, all should be coated with moly-base grease or engine assembly lube before the pushrods and the rocker arms are fitted. The other steps of installation are done in the reverse order of teardown and after everything is put back into place start the engine and look for signs of oil leakage.

Rocker arms can be pivoted away from the pushrods by removing the valve covers and loosening the rocker arm nuts before removal to measure camshaft lobe lift. The plunger on a dial indicator is to be positioned directly above the first pushrod, which is mounted on the engine. Disconnect the engine's electrical connectors from the distributor. Rotate the engine very slowly until it comes to rest with this pushrod sitting against its lowest point (base circle of camshaft lobe) then zero dial readout. As an effect of rotating crankshaft in normal direction indicator needle reaches its highest peak and starts reversing showing maximum cam lobe lift. Write this down and make check for all lobes comparing results obtained. If cam lobe lift is 0.003 inches less than specified, there will be a need for new camshaft installation since there has been a wear out of cam lobe. Also, remove fan shrouds, fan, radiator and condenser if applicable. Carefully remove them while properly labeling and storing before lifting off Lash Adjuster retainer. One must always be careful never to try to extract a camshaft with the Lash Adjusters left inside. Lash Adjuster removal from bores can also take different directions depending on what one wants to do next or how many Lash Adjusters are being replaced at once or maybe whether one has no other option but replace all of them because they are so bad that individual replacement would not solve anything here otherwise there could be no further discussion where others may simply call for removal with every other thing remaining intact Some other methods may include using tongs or pliers etc., By holding onto this chain while forcing it outwards (meaning our efforts are aimed at removing without damaging crankcase bearings which are located near bottom part). At this juncture, note carefully how two torx screws have been used here as well as appropriate directionality provided by manufacturer themselves. Three 6-inch long, 5/16-18 bolts can be threaded into the camshaft sprocket bolt holes to serve as handles when pulling on the camshaft, thus preventing any possible damage to bearings straight out. During an examination, there are several features that indicate damage in form of wear of cam lobes and bearing journals. Obtain a micrometer and take measurements of each cam journal's diameter and also determine height of every cam lobe using these results compared against appropriate tolerances. Should any journal have a diameter less than what it ought to be, then replace the particular camshaft. The procedure for changing these bearings is normally outsourced to automotive machine shops due to difficulties involved since they use specific tools and are manned by experts in this field. Once again, lubricate both camshaft bearing journals along with the cams lobes utilizing assembly lube meant for these parts, then gently slide it into block without damaging those sensitive lower ends of crankcase bearings near mounting points near crankcase face. As soon as position (dowel pin) after pivoting cylinder head in clockwise direction has been reached (that means 3 o'clock), lock it through tightening the thrust plate. By aligning dowel pins also confirming position of balancer shaft timing marks install balance shaft drive gear accordingly. Next, install the timing chain and gears in their right place using clean engine oil on Lash Adjusters when returning them into their respective bores because old Lash Adjusters may be reused if one is not installing new cams together with new Lash Adjusters too as was mentioned above or which case always follows after changing some worn out stock ones Finally, do everything else you did back but change oil before starting engine and put another filter.

Begin with taking off the camshaft by unscrewing or unbolting the rocker arms, push rods, intake manifolds, timing chains, cam sprocket and balance shaft drive gear; in addition, you may have to do away with such things as fan radiator and condenser. Place the lash adjusters in a labeled box and disconnect the lash adjuster retainer. A special tool can be employed together with magnet or even your fingers to extract the lash adjusters from their bores. Remove the camshaft retainer plate and use three 6-inch long, 5/16-18 bolts as a handle to remove the camshaft from block. When inspecting clean lash adjuster & cam shaft using solvent checking for wear on both of them. The journals as well as cam lobes should be checked for wear. Measure. If its damaged then it must be replaced along with bearings. To lubricate bearing journals and cam lobes with assembly lube, the camshaft will finally slide into engine during installation. Fix other parts like this: install that thrust plate for a Cam Shaft; balance shaft drive gear plus also timing chain & sprockets. Lubricate lash adjusters using clean engine oil then fix them within block. The rest of installation is opposite to that of removing these components. Cooling system should be refilled at last because we are starting again after changing an engine oil filter. Finally start engine (run) and check there are no leaks.

Begin with taking off the camshaft by unscrewing or unbolting the rocker arms, push rods, intake manifolds, timing chains, cam sprocket and balance shaft drive gear; in addition, you may have to do away with such things as fan radiator and condenser. Place the lash adjusters in a labeled box and disconnect the lash adjuster retainer. A special tool can be employed together with magnet or even your fingers to extract the lash adjusters from their bores. Remove the camshaft retainer plate and use three 6-inch long, 5/16-18 bolts as a handle to remove the camshaft from block. When inspecting clean lash adjuster & cam shaft using solvent checking for wear on both of them. The journals as well as cam lobes should be checked for wear. Measure. If its damaged then it must be replaced along with bearings. To lubricate bearing journals and cam lobes with assembly lube, the camshaft will finally slide into engine during installation. Fix other parts like this: install that thrust plate for a Cam Shaft; balance shaft drive gear plus also timing chain & sprockets. Lubricate lash adjusters using clean engine oil then fix them within block. The rest of installation is opposite to that of removing these components. Cooling system should be refilled at last because we are starting again after changing an engine oil filter. Finally start engine (run) and check there are no leaks.

In general, hydraulic lash adjusters are rather durable and do not require much attention to be paid to them. A noisy adjuster can be checked while the engine is running by putting a section of hose or tubing in contact with each intake or exhaust adjuster and listening to what is at the other end. As for the other ideas, touching each of the valve spring retainers with the finger, after the rocker cover has been unbolted, would lead to the feel of a bad adjuster through the shock as the valve seats down. If so, noise may be due with dirt got between the plunger and adjuster body when adjustments are correct. To get rid of the adjusters you have to eliminate the intake manifold with the valve cover and then, with the help of a lift rod pusher, you can pull each push rod out of the cylinder block. Where possible a special tool can be used to pull out the adjusters or a sharp scribe can be used to force up the adjusters instead using pliers on the adjuster body. Often, stuck adjusters can be released through the use of carb cleaner around the body of the adjuster and gently pumping the adjuster. It is also essential to store and label all the adjusters such that reinstallation of each adjuster is not mixed up with another. Once each of the adjusters is cleaned, one should look for either nicks or gauges, and if either of the two is present then replacement is required. The bottom contacting camshaft should be inspected for scratches as well as nicks and adjusters which should be replaced in case they show convexity due to wear. On the installation of the adjusters proper care must be taken in that they must be well covered with 'Molykote' or any equivalent product if the original adjusters are to be used again, they must be fitted to proper bore. Finally, replace all the valve parts and the covers, the valve cover, and the intake manifold.

To take off the camshaft, first disconnect the cable from the negative battery terminal and release fuel system pressure. From there on, remove; radiator, auxiliary automatic transmission fluid cooler (if equipped), power steering cooler, air conditioning condenser, valve covers, intake manifold, rocker arms, pushrods, timing chain and sprockets, and cylinder heads. Before you remove the lifters arrange to store them in a labeled container. Remove lash adjusters and camshaft retainer plate using a bolt as a handle to carefully pull out camshaft. To check out the camshaft measure lobe height and base circle for lobe lift determination; compare with specifications and replace the camshaft if necessary. Check the camshaft bearing journals for wear or damage; use a micrometer to measure them. Inspect the camshafts lobes for discoloration; score marks; chipped areas; unalike wear. Clean and inspect lash adjuster bodies for damage, wear and proper roller function. Put in place by lubricating bearing journals and lobes with assembly lube before sliding it into the engine, securing it with the Cam Thrust Plate. Install timing chain and sprockets , camshaft position sensor, lash adjusters As well as this refill cooling system, change oil, new oil filter installation precede start up-run engine process.

If a valve lash adjuster is noisy, one way to make it difficult for another noisy valve lash adjuster is to attach a piece of hose or tube to each valve while listening for the sound at the other end, or, remove the valve cover and place your hand on each of the valve spring retainers with the engine running to feel the shudder if the lash adjuster is bad. One frequently seen source of noise is debris that gets lodged in-between the plunger and the body of the lash adjuster. To start, begin with the valve cover and then slacken the two nuts that are sighted on the rocker arm at the cylinder harboring the louder lash adjuster and then turn the rocker arms away from the pushrods. Then you take out the pushrod guides and the pushrods, there is a cover for the pushrod that is fastened with four nuts. Loosen the locknuts on the cover studs to take off the lash adjuster guide retainer and lash adjuster guide, and retain them in order when more than one guide is to be taken off. Lash adjuster extraction can be made with a special tool, a small magnet or fingers on the newer engines that are not covered by the varnish; pliers must not be used. Lash adjusters should be kept in their proper box to avoid confusion during the time of re-establishing them in their right places. Wipe the lash adjusters with solvent and look at scuffing, score marks, or uneven wear of the rollers and be certain they rotate without hesitation. One can always re-install worn out roller lash adjusters with a new camshaft, the original camshafts on the other hand, can be reused with new roller lash adjusters. When using re-used lash adjusters place them only in their original bores, and apply moly-base grease or engine assembly lube to the lash adjusters, while the bearing surface of the lash adjusters' bores must be lubricated by engine oil. Position the aluminium lash adjusters in their respective bores with the oil orifice pointing towards the front of the engine and fit the lash adjuster guides and retaining nuts. Replace the pushrods, the pushrod guides, the rocker arms and the rocker arm retaining bolts and tighten the same to the recommended torque. Wipe the pushrod cover and draw a continuous line of the RTV sealant on the cover, then fit it along with the nuts as earlier tightened. Lastly, screw back the valve cover and it is done in a sequence but in a backward manner to removal.

Coat the lip of the camshaft seal with clean engine oil, press it into the end of the bearing cap, and use a seal driver to ensure it is flush and square.

Begin by removing the intake manifold or supercharger, valve covers, rocker arms, pushrods, timing chain, and cylinder heads, along with the radiator and air conditioning condenser. For 6.0L and 6.2L engines, also remove the Camshaft Position (CMP) sensor.

Ensure the oil passage hole in each hydraulic lifter is not blocked and that there are no burrs on the base of the lifter.

Use bolts threaded into the camshaft sprocket bolt holes to pull the camshaft out of the block, supporting it to prevent damage to the bearings.

To remove the camshaft, you need to remove the front cover, timing chain, and sprockets. Unbolt and remove the oil pump drive and the camshaft thrust plate. Carefully pull the camshaft out of the block.

Long bolts or a single bolt can be threaded into the camshaft sprocket bolt hole(s) to assist in removing the camshaft.

Alternatively, measure the camshaft lobe height and base circle with a micrometer after removal to determine lobe lift.

Avoid withdrawing the camshaft with the lifters in place. If the lifters are built up with gum and varnish, they may require special tools for extraction, although a small magnet or fingers may suffice in some cases. Do not use pliers unless intending to replace the lifters, as this can damage them.

After installing the camshaft, install the timing chain and sprockets. Lubricate the lifters with clean engine oil and install them in the block. Finally, change the oil and install a new oil filter before starting and running the engine.

Lubricate the camshaft bearing journals and lobes with assembly lube before sliding the camshaft into the engine, supporting it near the block. Turn the camshaft until the dowel pin is in the correct position, install the thrust plate, and tighten the bolts to the specified torque. Install the timing chain and sprockets, along with the camshaft position sensor using a new O-ring.

The steps for installing the camshaft are as follows:1. Lubricate the camshaft bearing journals and cam lobes with assembly lube.2. Slide the camshaft into the engine.3. Install the camshaft thrust plate.4. Install the balance shaft drive gear.5. Install the timing chain and sprockets.6. Lubricate the lifters with clean engine oil.7. Install the lifters in the block.8. Complete the installation in reverse order of removal.

The lifters should be stored in a clearly labeled box before removing them.

The steps to remove the camshaft are as follows: 1. Remove the intake manifold. 2. Remove the rocker arms. 3. Remove the pushrods. 4. Remove the timing chain. 5. Remove the camshaft sprocket. 6. Remove the balance shaft drive gear. 7. Remove the fan, radiator, and condenser. 8. Store the lifters in a labeled box. 9. Remove the lifter retainer. 10. Extract the lifters from the bores using a special tool, magnet, or your fingers. 11. Remove the camshaft retainer plate. 12. Use three 6-inch long, 5/16-18 bolts as a handle to remove the camshaft from the block.

If the cam lobe lift is less than specified, you should install a new camshaft.

If any camshaft journal diameter falls below the specified value, it is necessary to replace the camshaft.

Remove the camshaft sprocket bolts and carefully detach the sprockets from the camshafts.

During inspection, visually examine the cam lobes and bearing journals for wear, scoring, pitting, galling, overheating evidence (discoloration), and flaking of the hardened surface.

It is necessary to reach down into the cylinder block to remove the lifters.

Lubricate the lifters with clean engine oil and install them in the lifter retainers, aligning the flats properly. For 2005-on 5.3L models, ensure the raised surface aligns with the notched area of the retainer.

After installing the camshaft, you should install the thrust plate and tighten the bolts. Reinstall the oil pump drive.

Before removing the camshaft, the radiator, auxiliary automatic transmission fluid cooler (if equipped), power steering cooler, air conditioning condenser, valve covers, intake manifold, rocker arms, pushrods, timing chain and sprockets, and cylinder heads need to be removed.

The camshaft can be removed by removing the lifters and camshaft retainer plate, and using a bolt as a handle to carefully pull it out.

The steps to remove the camshaft are as follows:1. Remove the intake manifold.2. Remove the rocker arms.3. Remove the pushrods.4. Remove the timing chain.5. Remove the camshaft sprocket.6. Remove the balance shaft drive gear.7. Remove the fan, radiator, and condenser.8. Store the lifters in a labeled box.9. Remove the lifter retainer.10. Extract the lifters from the bores using a special tool, magnet, or your fingers.11. Remove the camshaft retainer plate.12. Use three 6-inch long, 5/16-18 bolts as a handle to remove the camshaft from the block.

The camshaft can be removed by removing the lifters and camshaft retainer plate, and using a bolt as a handle to carefully pull it out.

Begin by removing the cam carrier and the lifters from the cam carrier housing, keeping the lifters in order for reinstallation.

Store the lifters in a clearly labeled box to ensure they are reinstalled in their original locations. Note that some engines may have both standard and oversize lifters marked on the block.

Earlier models have conventional lifters, while later engines feature roller lifters, which are secured by a guide plate and lifter guides that must be removed to access the lifters.

Disconnect the idle speed power steering pressure switch, remove the power steering pump and brackets, and take off the power steering pump drive pulley using a puller to avoid damage.

Yes, these are AC Delco

These are sold individually, so only 1 lifter per order