Chevrolet 12637743 Chain Assembly, Cm/Shf Inter Drv

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It is however important to note that before disturbing the timing chain(s) from the sprocket(s) all the sprockets on the chain should be fitted with timing marks. In a car, it is necessary to rotate the engine as certain degrees just in order to match all these timing marks. This procedure requires three special tools to lock the camshafts on each cylinder head: tool numbers including EN48383-1, EN 48383-2 as well as EN 48383-3. Start by removing the cable from the negative terminal and also removing the cover of the timing chain. Bolt on the crankshaft pulley and turn the crankshaft clockwise until the mark on the primary timing chain sprocket lines up with the mark as shown on the oil pump housing in the 5 o'clock position for the stage one. Timing pointer position settings: if overhauling the right-side chain only, turn the timing mark to the 9 'clock position. Check to make sure that the flat segment on the rear of each camshaft on the left side cylinder head is up and parallel with the valve cover mating surface; if not turn the crankshaft clockwise 360 degrees and recheck the timing marks. Place the special tool to the left side camshafts Remove both timing chain tensioner bolts of the right side cylinder head, followed by removing the tensioner and discarding the gasket. Take off the right side cylinder head timing chain and its guides and do the same with the left side cylinder head. If so desired, undo the bolts that hold the idler sprockets and the sprockets in place. Fit identification marks on the camshaft sprockets and their respective camshafts, and while holding the camshaft correctly fitted, slacken and remove the camshaft sprocket bolt. Check for damages on timing chain cover, wash all related parts and ascertain that the guides/timing chain sprockets are worn out or damaged. Release the tension of the cables and thereafter make sure they remain in their position in case of any tension build up. The fact is that before starting the engine, the crankshaft should be turned by hand no less than two times checking its perspectively. Find the Woodruff key which fits onto the crankshaft and position it so that the planed crank face is adjacent to the cylinder head and indexed marks are easily seen. Insert the special retaining tool onto the left side camshafts, then place left side secondary chain over the sprocket on the gear, ordering the timing links. Go on and thread the chain over both of the camshaft actuator sprockets while maintaining the correct orientation. Finally fit the left side timing chain tensioner, timing chain guides and the similarly the right side timing chain idler and the primary timing chain must all be positioned in such a way that the timing mark lines up properly. Place the tensioner and compare the alignment marks on it. Turn the crankshaft to the nine position and fit the two special locking tools on the two cylinder heads. Subsequent to this, place the over head camshaft timing right-side timing chain in the right position at the camshaft sprockets and thereafter assemble the timing chain guides and the tensioner. Scrape off all the prior contour sealants from the block and the timing chain cover, besides that, take out all the special locking tools from the camshafts. The rest of the installation also works in the process of dismantling, step by step starting from the top part of the installation.

While performing the timing system, care should be taken since an error can result to the severe damage of the engines; this procedure should be performed by an expert, and if a question arise, one should seek advice. Ensure that all the sprockets contain the timing marks and in that case ensure that the engine is turned to the correct positions for the removal of the timing chain(s). This operation needs three special tools to immobilise the camshafts and these tools should be procured in advance. Start with removing the negative terminal of the battery, draining the oil, and the oil filter and spark plugs to help with turning of the engine. Move on to the Discover more removal of drive belt, intake manifold, valve covers, water pump, power steering reservoir bracket, alternator, crankshaft pulley, CMP sensor bolts, electrical connectors for the camshaft position actuator valves, engine mount bracket, drive belt idler pulley, and thermostat housing. All the bolts to be pulled out of the timing chain cover; a bolt should be employed to lever on so as to remove the bolt holding the cover. Adjust the crankshaft to set the primary timing chain sprocket with the mark on the oil pump housing also make sure that flat segments on camshaft are set. That means the timing chain tensioner bolts and guides must be removed and once again you need to be careful because the tensioner is under spring tension. Do the same for the lower timing chain; check the conditions of each component for wear or damages, and then wash them. During installation stage make sure that on the crankshaft sprocket, the special retaining tool is fitted on the camshaft and that all the timing chains, guides and tensioners are well fitted with correct alignment marks. Once all these are lined and aligned well, the sealing surfaces should then be cleaned, a new seal fitted on the timing cover, some RTV sealant applied and then placing the cover well before tightening the bolts properly and in the sequence that is equally recommended. The rest of the installation is done in the reverse order that is used in the removal process.

Caution! This is a complex process with an possibility of causing serious engine damage if not done correctly. Without significant experience in this kind of repair, do not try to replace the timing chain; unless you are sure about it, consult a specialist. Before attempting to start the engine, ensure accuracy through double-checking all work. Make sure that all sprockets have timing marks before removing the timing chain(s) from their sprockets. These tools required for this procedure (EN 48383-1, 48383-2, and EN 48383-3) can be obtained from SPX Tools. The following steps outlined below must assume that we have already got rid of the engine, subframe and transaxle assembly,Begin by disconnecting the battery ground cable negative terminal, drain oil out of the car and remove oil filter. Remove spark plugs for easier engine rotation; drivebelt and tensioner; intake manifold; valve covers; water pump; power steering components without disconnecting lines; alternator; crankshaft pulley; Camshaft Position (CMP) sensors; camshaft position actuator valves; engine mount bracket; drivebelt idler pulley thermostat housing. Disconnect each corner bolt with a bolt close to the water pump to release cover from block at bottom end of engine cover and carefully separate from block tapping gently with soft mallet. Turn the crankshaft till primary timing chain sprocket mark aligns with oil pump housing mark at five o'clock position. Engage special tools onto camshafts remove rear cylinder head timing chain tensioner bolts and cautiously take off tensioner. Release special holding tools off cams (camshafts). Repeat this process for lower or primary timing chain on front cylinder head. Clean components replacing as necessary and reset tensioners. Installation with crankshaft sprocket aligned with woodruff key ensuring timing marks are aligned as well as special tools on the camshafts. Mount timing chains, guides and tensioners ensuring accurate positioning of all timing marks, remove camshaft retaining tools. Rotate crankshaft till sprocket mark align with oil pump housing mark at 9 o'clock position; use special locking tools to lock up the cams (camshafts) and proceed to install the rear cylinder head timing chain. Insert inner and outer guides, a new tensioner gasket as well as the tensioner itself. Repeat this process for front cylinder head primary timing chain. Clean timing chain cover carefully, apply RTV sealant then slide over crankshaft using aligning studs before tightening cover bolts. Reinstall everything in reverse but only check proper engine rotation before starting it.

Caution! This is a complex process with an possibility of causing serious engine damage if not done correctly. Without significant experience in this kind of repair, do not try to replace the timing chain; unless you are sure about it, consult a specialist. Before attempting to start the engine, ensure accuracy through double-checking all work. Make sure that all sprockets have timing marks before removing the timing chain(s) from their sprockets. These tools required for this procedure (EN 48383-1, 48383-2, and EN 48383-3) can be obtained from SPX Tools. The following steps outlined below must assume that we have already got rid of the engine, subframe and transaxle assembly,Begin by disconnecting the battery ground cable negative terminal, drain oil out of the car and remove oil filter. Remove spark plugs for easier engine rotation; drivebelt and tensioner; intake manifold; valve covers; water pump; power steering components without disconnecting lines; alternator; crankshaft pulley; Camshaft Position (CMP) sensors; camshaft position actuator valves; engine mount bracket; drivebelt idler pulley thermostat housing. Disconnect each corner bolt with a bolt close to the water pump to release cover from block at bottom end of engine cover and carefully separate from block tapping gently with soft mallet. Turn the crankshaft till primary timing chain sprocket mark aligns with oil pump housing mark at five o'clock position. Engage special tools onto camshafts remove rear cylinder head timing chain tensioner bolts and cautiously take off tensioner. Release special holding tools off cams (camshafts). Repeat this process for lower or primary timing chain on front cylinder head. Clean components replacing as necessary and reset tensioners. Installation with crankshaft sprocket aligned with woodruff key ensuring timing marks are aligned as well as special tools on the camshafts. Mount timing chains, guides and tensioners ensuring accurate positioning of all timing marks, remove camshaft retaining tools. Rotate crankshaft till sprocket mark align with oil pump housing mark at 9 o'clock position; use special locking tools to lock up the cams (camshafts) and proceed to install the rear cylinder head timing chain. Insert inner and outer guides, a new tensioner gasket as well as the tensioner itself. Repeat this process for front cylinder head primary timing chain. Clean timing chain cover carefully, apply RTV sealant then slide over crankshaft using aligning studs before tightening cover bolts. Reinstall everything in reverse but only check proper engine rotation before starting it.

Rotate the crankshaft to align the sprocket mark with the oil pump housing mark in the 9 o'clock position, install special locking tools on camshafts, and proceed to install the rear cylinder head timing chain. Install inner and outer guides, a new gasket for the tensioner, and the tensioner itself. Repeat this process for the front cylinder head's primary timing chain.

The timing system is complex, and severe engine damage can occur if mistakes are made. Therefore, this procedure should only be attempted by those highly experienced in such repairs. If unsure, consulting an expert is advised.

Remove the crankshaft balancer and the Camshaft Position (CMP) sensor.

Inspect the camshaft and crankshaft sprockets for damage or wear, and if necessary, remove the crankshaft sprocket carefully.

Remove the drivebelt and unbolt the drivebelt tensioner.

Before starting the engine, rotate the crankshaft by hand to check for resistance, which may indicate potential issues.

Before removing the timing chain(s), ensure that all sprockets have timing marks and rotate the engine to the necessary positions for alignment.

Take out the thermostat and the water pump pulley, followed by the crankshaft pulley.

The timing system is complex, and severe engine damage can occur from mistakes, so only highly experienced individuals should attempt this procedure. If unsure, consulting an expert is advised.

Disconnect the coolant hoses from the coolant bypass pipe for specific engine models, and take out the crankshaft position sensor and camshaft actuator solenoid.

After installing the timing chain, install the adjustable and fixed timing chain guides, followed by the upper timing chain guide. Tighten the camshaft bolts while holding the camshafts to prevent turning, then install the timing chain tensioner in its compressed state, ensuring it is properly assembled.

Before starting the engine, rotate the crankshaft by hand to check for resistance, which may indicate potential issues.