GM 12594939
Timing Cover, Front

To replace the engine front cover for rpos ly6/l76/l92, start by removing the Water Pump, crankshaft balancer, as well as disconnecting the engine harness electrical connecter from the camshaft position (CMP) sensor wire harness. Next, loosen the oil pan-to-front cover bolts, front cover bolts (501), and then remove the front cover (502) and gasket (503), and discard the old gasket. Take off the crankshaft front oil seal, and if the engine front cover is to be replaced, proceed to remove the cmp sensor wire harness bolts (738), disconnect the wire harness from the cmp sensor, and remove the cmp sensor wire harness (737) and cmp sensor (703). Alsoimitive recover the cmp actuator magnet bolts (751) & magnet (752) discarding the cmp actuator magnet gasket (753). For installation, be careful not to reuse the crankshaft oil seal or front cover gasket and use no sealant unless stated. Center the crankshaft front oil seal correctly to avoid premature wear or leaking. When replacing the front cover, install a new cmp actuator magnet gasket (753), the cmp actuator magnet (752) and the bolts (751) applying 12 n.m (106 lb in). Check for wear and tear and lubricate the cmp sensor o-ring seal (704) with clean engine oil and then install the cmp sensor (703). Mount the cmp sensor wire harness (737) to the front cover, take it to the cmp sensor, then take the wire harness bolts (738) and tighten them to 12 n.m (106 lb in). Apply 5 mm (0.20 in) bead of sealant to the oil pan-to-engine block junction, place a new engine front cover gasket- (503) and front cover (502) onto the engine, and tighten front cover bolts (501) and oil pan to the front cover bolts until tight. Apply the j 41476 front and rear cover alignment tool (J 41476) to align the front cover, install the crankshaft balancer bolt snugly. Lastly, tighten the oil pan to front cover bolts at 25 n.m (18 lb ft), tighten the engine front cover bolts at 25 n.m (18 lb ft), remove the j41476, connect the engine harness electrical connector back to cmp sensor wire harness, replace a new crankshaft front oil seal and install the Water Pump.

If you are to change the engine front cover, remove the Water Pump and crankshaft balancer first. Unplug the cmp sensor wire harness from cmp actuator magnet and the engine harness from cmp sensorarness. The next step is to remove Oil Pan to front cover bolts and front cover bolts (501), after which the front cover (502) should be removed along with its gasket (503) which should be discarded. Strip the crankshaft front oil seal off it and in case of changing the engine front cover take off the cmp sensor wire harness and bolts and disconnecting it from the cmp sensor off and besides taking off the cmp sensor wire harness and the cmp sensor (703) and cmp actuator magnet bolts (751) and magnet (752) but discarding cmp actuator magnet gasket (753). For installation, do not use the reused crankshaft oil seal or the front cover gasket and do not apply the sealant to the front cover gasket in the absence of instructions. Use the en-48853 front cover alignment tool which will adjust the crankshaft front oil seal properly. Install a new cmp actuator magnet gasket (753), put the cmp actuator magnet (752) and bolts (751) on and tighten them to 12 nm (106 lb in) check the cmp sensor o-ring seal (704) for damage, lubricate its o-ring with clean engine oil and install the cmp sensor (703). Mount the cmp sensor wire harness to the front cover, attach it to the compressor pressure sensor, tighten the cmp sensor wire harness bolts to 12 nm (106 lb in), and apply gasket between the wire harness and the front cover. Put a 5 mm, 20 mm 0.20in,0.80in length bead of sealant on the Oil Pan, the Oil Pan to engine block junction ,and then to position the new engine front cover gasket (503) and front cover (502) on the engine. Putting in front cover bolts (501) until snug in sequence avoiding overtightening, oil pan to front cover bolts in finger-tight sequence. Install the crank shaft balancer bolt partially tight then tighten the Oil Pan to front cover at 25 nm (18 lb ft) then tighten the engine front cover bolts at 25 nm (18 lb ft). Unplug the tools, place the cmp sensor, and connect the engine harness electrical connector to the cmp sensor wire harness electrical connector and the Camshaft Position Sensor wire harness electrical connector to the cmp actuator magnet. Finally, seal a new crankshaft front oil seal and also the Water Pump.

Remove the crankshaft balancer and the camshaft position sensors, followed by the camshaft position actuator solenoid valves from the front cover.

Inspect the CMP sensor O-ring seal for damage; if undamaged, lubricate it with clean engine oil and install the CMP sensor.

Remove the 7 mm center bolt and the remaining engine front cover bolts.

Tighten the oil pan to front cover bolts and engine front cover bolts to 25 Nm (18 lb ft).

First, remove the water pump, crankshaft balancer, and oil pan.

Use the Front and Rear Cover Alignment Tool (J 41476) to align the front cover.