OEM 2004 Chevrolet Impala Timing Cover

2004 Chevrolet Impala Timing Cover Parts Questions & Experts Answers

• Q: How to replace the engine front timing cover on 2004 Chevrolet Impala?

  A: To remove the front cover of the engine, start by lowering the negative cable of the battery and lifting the car for access. Drain the engine oil and the cooling system and drop the vehicle to loosen up the Water Pump Pulley. Removal of the drive belt tensioner and Water Pump Pulley. Move the Power Steering Pump to its new position after unscrewing all its bolts and lift the vehicle up to unscrew the crankshaft balancer being very careful not to damage the crankshaft. Remove the crankshaft front oil seal by using a flat-bladed tool making sure that no damage occurs at the crankshaft surfaces. Pulling the electrical connectors from the camshaft position (CMP) sensor, crankshaft position (CKP) sensor, oil pressure sensor, crankshaft position sensor shield, and the radiator outlet hose away from the Water Pump. Mount the engine support fixture, lift the vehicle, and if needed, lower the Oil Pan a little to provide clearance. Take off the Oil Filter and the engine mount bracket, disconnect the oil lever sensor electrical connector and remove the oil lever sensor. Then, take out the Oil Pan-to-engine front cover bolts and loosen the other Oil Pan bolts without taking them out, and then take out the Crankshaft Position Sensor and engine front cover bolts. Remove the engine front cover along with the Oil Filter adapter as an entire assembly as well as the engine front cover gasket. When replacing the engine front cover, it requires one to remove the Oil Filter adapter, pressure relief valve, water pump, and oil pump cover and gear set, inspecting the oil pump cover and gear set, timing chain, sprockets and Oil Pan gasket for wear. Clean the mating surfaces on the front cover of the engine before installation. If replacing engine front cover, install Camshaft Position Sensor and its bolt and tighten it of 10 nm (89 inch lbs). Mount the oil pump cover and the gear set then the Water Pump tightening the long bolts on the Water Pump to 34 nm (25 ft. Lbs.) and short bolts to 22 nm (16 ft.lbs.). Mount the pressure relief valve, oil filter adapter, and bolts, 15 nm (11 ft. Lbs.) + 50 degrees. Install a new engine front cover gasket, apply sealer gm p/n 12346004 (Canadian P/N 10953480) to the threads of the bolts, and line up cogs on crankshaft sprocket with ones on oil pump gear set. Fix the engine front cover with its bolts and fixing them at 20 nm (15ft. Lbs.) + 40 degrees. Replace the Crankshaft Position Sensor and the sensor studs and secure the studs using a torque from 30 nm to 22 ft. Lbs. Install the Oil Pan-to-engine front cover bolts tightening 14 nm (125 inch lbs), and the oil level sensor that should also be tightened to 20 nm (15 ft lb.). Solder the oil level sensor electrical connector, put on the engine mount bracket, and then fix on the Water Pump Pulley and bolts, tight the bolts with 13 nm (116 inch lbs.). Replace the Oil Filter and radiator outlet hose. The engine Oil Pan drain plug. Install the new engine front cover seal using j 35354 seal installer to tighten the bolt until the crankshaft front oil seal is seated and remove j 35354. Mount the Crankshaft Position Sensor shield and reconnect the electrical connection to the oil pressure sensor, ckp sensor, and cmp sensor. Replace the crankshaft balancer, slightly lower the vehicle; change the Power Steering Pump and bolts, tightening it measuring 34 nm (25 ft. Lbs.). Take out the engine support fixture, install the drive belt tensioner, top up the cooling system and crankcase with engine oil, reconnect the negative Battery Cable, inspect for leaks, and run the ckp system variation learn procedure.