GM 89017798
Timing Cover

A technician should commence engine front cover replacement by following cooling system draining and filling (GE 47716). Start by removing the air cleaner assembly and all belts including those of the accessory drive and Drive Belt tensioners and Drive Belt idler pulleys. After removing the Water Pump Pulley, water outlet housing, and radiator and heater hoses from the Thermostat Housing. First remove the crankshaft balancer and engine front cover bolts before taking out the cover with the old gasket and oil pump drive to crankshaft balancer friction washer which gets discarded. Engine front cover preparation should start before adding the new friction washer and sealing the upper and lower crankcases split line with a small amount of sealant. Put the new engine front cover gasket in position so it fits over the crankcase dowel pins then put sealant on the gasket pad area. Secure the engine front cover after adding thread locking compound to its bolts and tighten them to 15 nm (11 lb ft) in the proper sequence. Put back the Radiator Hose along with the heater hose and water outlet housing before setting the crankshaft balancer into position and the Water Pump Pulley. Start by placing the accessory Drive Belt idler pulleys, tensioners, and belts before attaching the air cleaner assembly. Conclude your work by performing cooling system draining and filling (GE 47716) procedures.

In order to replace the engine front cover, one should first drain the cooling system with the help of the cooling system draining and filling (Static Fill) (GE 47716). Remove the air outlet duct and then you can access the Thermostat Housing, remove the heater hose by using the hose clamppliers (J 38185) from the Thermostat Housing. Then disconnect the coolant Radiator Hose from the Thermostat Housing, and further, the Drive Belt tensioner and the accessory Drive Belt. Take off the Drive Belt idler pulley bolt and its idler pulley, remove the Water Pump Pulley. Lift up the vehicle and remove the crankshaft balancer. Following that, unbolt the engine front cover bolts and the engine front cover itself and discard the old gasket. Clean and inspect the engine front cover, then apply a small quantity of sealant on top of the split-line in which the upper and lower crankcases join as well as at the upper end of the block face. Apply a new engine front cover gasket to crankcase dowel pins and locate the engine front cover. Apply thread locking compound on the threads of engine front cover bolts, fit the bolts, tightening them (as specified) to 15 n.m (11 lb ft) in the specified sequence. Re-install the crankshaft balancer and then the Water Pump Pulley; tighten its bolts to 10 n.m (89 lb in). Fit the Drive Belt idler pulley together with its bolt and fasten it using the pressure of 50 n.m (37 lb ft). Replace the accessory Drive Belt and the Drive Belt tensioner. Last, connect the coolant Radiator Hose with the heater hose again with the help of the hose clamp pliers (J 38185), reinstall the air outlet duct and fill the cooling system, by following the cooling system draining and filling (Static Fill) (GE 47716).

Reconnect the coolant radiator hose and the heater hose using the Hose Clamp Pliers (J 38185).

Use the Hose Clamp Pliers (J 38185).

A total of 22 M8 bolts must be removed, along with 3 optional M12 bolts.

First, drain the engine cooling system and the charge air cooling system.

Remove the upper intake manifold with the lower intake manifold, and then the camshaft covers.

Insert a piece of cardboard between the oil pan front and the oil pump.

Ensure not to disconnect the power steering pipes or drain the fluid.

Finally, install the camshaft covers, the intake manifold for LLT engines or the upper and lower intake manifold for LP1 and LY7 engines, and the engine cover, followed by filling the cooling system again and changing the engine oil.

Remove the crankshaft balancer and engine front cover bolts to take off the engine front cover.

Reposition the power steering fluid reservoir, remove the power steering pump pulley, and then the power steering pump upper front bolt while loosening the remaining bolts.

Gather the necessary tools: Engine Front Cover Installation Guide Pins (EN 46109).

Reinstall the afterboil coolant pump.

Install the camshaft position actuator solenoid valves and camshaft position sensors, followed by the crankshaft balancer, power steering pump, and power steering pump pulley.

Clean them carefully, ensuring no contaminants fall into the oil pan.