GM 12591689 Sprocket, Camshaft

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To remove the timing chain cover, you need to first detach the negative cable from the battery and drain all the coolant. Afterwards, take out cooling fan, water pump, drive belt pulley and vibration damper. Then remove crankshaft position sensor and wiring harness nut. Remove oil pan then disconnect wiring harness clips from front cover. Remove crankshaft position sensor and camshaft position sensor with its jumper wiring harness. Afterward, remove the cover bolts and separate timing chain cover from block. Remove crankshaft position sensor reluctor ring and check timing chain free play. When needed replace the chain as well as sprockets. Be sure to align sprocket timing marks as well as release timing chain tensioner. To install timing chain cover clean engine block sealing surfaces then line up keyway on crankshaft sprocket. Press sprocket onto crankshaft while aligning balance shaft gears on opposite ends of shafts. Position crankshaft comparison camshaft sprocket in a way that allows passage of a looped chain over it. Apply thread locking compound onto camshaft sprocket bolt threads then tighten them up. Install crankshaft position sensor reluctor ring and apply RTV sealant to engine block sealing surface. Place new front cover and oil seal assembly in place plus tighten down on retaining bolts of cover afterward screws are tightened except for one at each end of upper edge of front plate where the attachment is made at an angle toward middle). Finally put back oil pan, vibration damper and then crankshaft position censor.

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.

To the above we add, To eradicate these parts, one should first unplug the wire from the doormat negative terminal followed by draining coolant. Subsequently, the drivebelt and tensioner must be taken off, the engine oil pan and the crankshaft balancer pulley must also be taken off. Remove the camshaft position actuator magnet and its O-ring, remove the thermostat and the water pump. Remove the bolts between the timing chain cover and the engine block, and then release the connected sections by applying a soft face hammer in case of possible rigidity. For the same purpose tighten the crankshaft pulley bolt for some time and rotate the crankshaft until the timing mark of the crankshaft sprocket is brought in line with the chain tensioner plate and at the same time the hole on the camshaft sprocket is at the 6 o'clock position. If you are PF or have a TCI solenoid, use a TORX PLUS socket to loosen and remove the camshaft sprocket bolt(s) without rotating the camshaft. Loosen the variable camshaft timing sprocket from the camshaft dowel pin and take the timing chain and a camshaft sprocket away from the engine. Check the timing chain worn, damaged or showing more freeplay than permissible limit, also check the sprockets of the timing chain and replace them both as pairs. The step of alignment during the installation is the matching of key in the crankshaft to the keyway in the sprocket, pay attention to the wear and defects of the timing chain tensioner, and wash the parts. Recut and clean the mating surface of the cover and remove the old gasket material on the engine block, put the tensioner plate into the engine block and align the dowel pin of the camshaft and also against 3 o'clock before mating the timing chain with the sprockets of the camshaft and crankshaft. Bolt the variable camshaft timing sprocket, apply oil on the chain and sprocket then, remove the tensioner locking pin. Use of the anaerobic sealant to stick the new gasket into place and the cover fitted and tightening the bolts in the star pattern. Last of all, pour the oil and the coolant; switch on the engine; look for any signs of leakage.

To the above we add, To eradicate these parts, one should first unplug the wire from the doormat negative terminal followed by draining coolant. Subsequently, the drivebelt and tensioner must be taken off, the engine oil pan and the crankshaft balancer pulley must also be taken off. Remove the camshaft position actuator magnet and its O-ring, remove the thermostat and the water pump. Remove the bolts between the timing chain cover and the engine block, and then release the connected sections by applying a soft face hammer in case of possible rigidity. For the same purpose tighten the crankshaft pulley bolt for some time and rotate the crankshaft until the timing mark of the crankshaft sprocket is brought in line with the chain tensioner plate and at the same time the hole on the camshaft sprocket is at the 6 o'clock position. If you are PF or have a TCI solenoid, use a TORX PLUS socket to loosen and remove the camshaft sprocket bolt(s) without rotating the camshaft. Loosen the variable camshaft timing sprocket from the camshaft dowel pin and take the timing chain and a camshaft sprocket away from the engine. Check the timing chain worn, damaged or showing more freeplay than permissible limit, also check the sprockets of the timing chain and replace them both as pairs. The step of alignment during the installation is the matching of key in the crankshaft to the keyway in the sprocket, pay attention to the wear and defects of the timing chain tensioner, and wash the parts. Recut and clean the mating surface of the cover and remove the old gasket material on the engine block, put the tensioner plate into the engine block and align the dowel pin of the camshaft and also against 3 o'clock before mating the timing chain with the sprockets of the camshaft and crankshaft. Bolt the variable camshaft timing sprocket, apply oil on the chain and sprocket then, remove the tensioner locking pin. Use of the anaerobic sealant to stick the new gasket into place and the cover fitted and tightening the bolts in the star pattern. Last of all, pour the oil and the coolant; switch on the engine; look for any signs of leakage.

To remove the timing chain cover, you need to first detach the negative cable from the battery and drain all the coolant. Afterwards, take out cooling fan, water pump, drive belt pulley and vibration damper. Then remove crankshaft position sensor and wiring harness nut. Remove oil pan then disconnect wiring harness clips from front cover. Remove crankshaft position sensor and camshaft position sensor with its jumper wiring harness. Afterward, remove the cover bolts and separate timing chain cover from block. Remove crankshaft position sensor reluctor ring and check timing chain free play. When needed replace the chain as well as sprockets. Be sure to align sprocket timing marks as well as release timing chain tensioner. To install timing chain cover clean engine block sealing surfaces then line up keyway on crankshaft sprocket. Press sprocket onto crankshaft while aligning balance shaft gears on opposite ends of shafts. Position crankshaft comparison camshaft sprocket in a way that allows passage of a looped chain over it. Apply thread locking compound onto camshaft sprocket bolt threads then tighten them up. Install crankshaft position sensor reluctor ring and apply RTV sealant to engine block sealing surface. Place new front cover and oil seal assembly in place plus tighten down on retaining bolts of cover afterward screws are tightened except for one at each end of upper edge of front plate where the attachment is made at an angle toward middle). Finally put back oil pan, vibration damper and then crankshaft position censor.

To remove the timing chain cover, you need to first detach the negative cable from the battery and drain all the coolant. Afterwards, take out cooling fan, water pump, drive belt pulley and vibration damper. Then remove crankshaft position sensor and wiring harness nut. Remove oil pan then disconnect wiring harness clips from front cover. Remove crankshaft position sensor and camshaft position sensor with its jumper wiring harness. Afterward, remove the cover bolts and separate timing chain cover from block. Remove crankshaft position sensor reluctor ring and check timing chain free play. When needed replace the chain as well as sprockets. Be sure to align sprocket timing marks as well as release timing chain tensioner. To install timing chain cover clean engine block sealing surfaces then line up keyway on crankshaft sprocket. Press sprocket onto crankshaft while aligning balance shaft gears on opposite ends of shafts. Position crankshaft comparison camshaft sprocket in a way that allows passage of a looped chain over it. Apply thread locking compound onto camshaft sprocket bolt threads then tighten them up. Install crankshaft position sensor reluctor ring and apply RTV sealant to engine block sealing surface. Place new front cover and oil seal assembly in place plus tighten down on retaining bolts of cover afterward screws are tightened except for one at each end of upper edge of front plate where the attachment is made at an angle toward middle). Finally put back oil pan, vibration damper and then crankshaft position censor.

To remove the timing chain cover, you need to first detach the negative cable from the battery and drain all the coolant. Afterwards, take out cooling fan, water pump, drive belt pulley and vibration damper. Then remove crankshaft position sensor and wiring harness nut. Remove oil pan then disconnect wiring harness clips from front cover. Remove crankshaft position sensor and camshaft position sensor with its jumper wiring harness. Afterward, remove the cover bolts and separate timing chain cover from block. Remove crankshaft position sensor reluctor ring and check timing chain free play. When needed replace the chain as well as sprockets. Be sure to align sprocket timing marks as well as release timing chain tensioner. To install timing chain cover clean engine block sealing surfaces then line up keyway on crankshaft sprocket. Press sprocket onto crankshaft while aligning balance shaft gears on opposite ends of shafts. Position crankshaft comparison camshaft sprocket in a way that allows passage of a looped chain over it. Apply thread locking compound onto camshaft sprocket bolt threads then tighten them up. Install crankshaft position sensor reluctor ring and apply RTV sealant to engine block sealing surface. Place new front cover and oil seal assembly in place plus tighten down on retaining bolts of cover afterward screws are tightened except for one at each end of upper edge of front plate where the attachment is made at an angle toward middle). Finally put back oil pan, vibration damper and then crankshaft position censor.

To remove the timing chain cover, you need to first detach the negative cable from the battery and drain all the coolant. Afterwards, take out cooling fan, water pump, drive belt pulley and vibration damper. Then remove crankshaft position sensor and wiring harness nut. Remove oil pan then disconnect wiring harness clips from front cover. Remove crankshaft position sensor and camshaft position sensor with its jumper wiring harness. Afterward, remove the cover bolts and separate timing chain cover from block. Remove crankshaft position sensor reluctor ring and check timing chain free play. When needed replace the chain as well as sprockets. Be sure to align sprocket timing marks as well as release timing chain tensioner. To install timing chain cover clean engine block sealing surfaces then line up keyway on crankshaft sprocket. Press sprocket onto crankshaft while aligning balance shaft gears on opposite ends of shafts. Position crankshaft comparison camshaft sprocket in a way that allows passage of a looped chain over it. Apply thread locking compound onto camshaft sprocket bolt threads then tighten them up. Install crankshaft position sensor reluctor ring and apply RTV sealant to engine block sealing surface. Place new front cover and oil seal assembly in place plus tighten down on retaining bolts of cover afterward screws are tightened except for one at each end of upper edge of front plate where the attachment is made at an angle toward middle). Finally put back oil pan, vibration damper and then crankshaft position censor.

Avoid rotating the crankshaft or camshafts separately with the timing belt removed to prevent valve damage.

Begin by removing the timing chain cover. For 2005 through mid-2007 models, rotate the crankshaft clockwise until the timing mark aligns with the oil pump housing mark in the 9 o'clock position, ensuring the flat segment on the rear of each camshaft on the right-side cylinder head is facing up.

Rotate the exhaust camshaft actuator clockwise until it stops, ensuring it is in the full advance position before tightening the bolt.

Ensure the timing chains are replaced as a set with the sprockets, clean all sealing areas, and apply RTV sealant to the timing cover.

To install the timing chain cover, you need to follow these steps:1. Clean the engine block sealing surfaces.2. Align the keyway in the crankshaft sprocket.3. Press the sprocket onto the crankshaft.4. Align the balance shaft gears.5. Position the crankshaft and loop the chain over the camshaft sprocket.6. Apply thread locking compound to the camshaft sprocket bolt threads and tighten them.7. Install the crankshaft position sensor reluctor ring.8. Apply RTV sealant to the engine block sealing surface.9. Position the new front cover and oil seal assembly.10. Tighten the cover retaining bolts.11. Install the oil pan.12. Install the vibration damper.13. Install the crankshaft position sensor.

Lift the timing chain and guide the exhaust camshaft actuator into place, aligning the mark on the actuator sprocket with a darkened link, and install the actuator onto the exhaust camshaft without fully tightening the bolt.

Take out the timing chain tensioner shoe bolt and the timing chain guide bolt before removing the guide and shoe, as well as the tensioner if it is being replaced.