GM 12591746
Timing Cover, Front

You should start your repair of the engine front cover (all versions except RPOs LC9, LH6, LMG, LY2, LY5) by removing the Water Pump after which you should take out the crankshaft balancer. The engine harness electrical connector needs removal from the camshaft position (CMP) sensor wire harness before you take out the Oil Pan-to-front cover bolts then the front cover bolts. First remove the front cover along with its gasket while discarding the gasket, then take off the crankshaft front oil seal. To replace the engine front cover you must remove bolts holding the cmp sensor wire harness after disconnecting the wire harness from the cmp sensor before extracting the cmp sensor and actuator magnet with their gaskets and bolts. Replace the crankshaft oil seal and avoid using new front cover gasket during installation unless otherwise directed. Also do not apply sealant in any case. Properly position the front crankshaft oil seal to stop premature wear and leakage. After applying the cmp actuator magnet gasket to the magnet you should install the magnet along with its bolts while torqueing them to 12 nm (106 lb in). Before sensor installation inspect and apply lubrication to the cmp sensor o-ring seal while securing both cmp sensor and its wire harness with torque bolts set to 12 nm (106 lb in). Before installation put a 5 mm (0.20 in) sealant bead at the Oil Pan to engine block junction point. Position the new engine front cover gasket and front cover and tighten bolts on the front cover and Oil Pan-to-front cover connection but avoid over-torquing. After front cover alignment with tool j 41476 apply crankshaft balance bolt hexagonal nut. Reconnect the engine harness electrical connector before installing a new crankshaft front oil seal but perform the following tasks first: snug the crankshaft balancer bolt with the j 41476 tool then tighten the Oil Pan to front cover bolts and engine front cover bolts to 25 nm (18 lb ft).

Install the front cover bolts, tightening them to 12 N.m (106 lb in), and do not reuse the original O-ring seal.

Reinstall the engine wire harness clip to the front cover, followed by the engine shield and bolts, tightening them to 20 Nm (15 lb ft), and finally reinstall the oil pan, crankshaft balancer, and water pump.

Remove the crankshaft front oil seal, CMP sensor wire harness bolts, disconnect the wire harness from the CMP sensor, and remove the CMP sensor wire harness and the CMP sensor.

Connect the engine wiring harness electrical connector from the CMP sensor wiring harness jumper, ensuring not to reuse the original CKP sensor O-ring seal.

Lubricate a NEW CKP sensor O-ring seal with clean engine oil and install it onto the CKP sensor, making sure the sensor is fully seated before tightening the bolt to 8 Nm (71 lb in).