Skylark L4-138 2.3L DOHC VIN D MFI QUAD 4 (1989)
CORRECTION
Replace oil flow check valve. Inspect and replace any damaged valve train components. Refer to "Oil Flow Check Valve Replacement" procedure in
this bulletin.
CONDITION
4.
Engine can not be turned over.
POSSIBLE CAUSE
Intake or exhaust camshaft seized in carrier resulting from restricted oil flow due to ball check in valve stuck closed.
CORRECTION
Replace oil flow check valve. Inspect and replace any damaged valve train components. Refer to " Oil Flow Check Valve Replacement" procedure in
this bulletin.
Checking Engine Oil Pressure
IMPORTANT:
Prior to checking engine oil pressure, insure engine oil is at the correct level.
Oil pressure test at oil filter:
1.
Disconnect cooling fan connector.
CAUTION:
To prevent injury, the engine cooling fan must be disconnected when servicing oil filter area.
2.
Remove oil filter from engine.
3.
Install oil pressure tester J 25087-C or equivalent to filter base.
4.
Start engine and observe oil pressure. Minimum pressure cold engine: 40 PSI.
5.
Remove pressure tester.
6.
Install oil filter.
7.
Connect cooling fan connector.
8.
Check for correct engine oil level. Adjust if necessary.
OIL PRESSURE TEST AT EXHAUST CAM CARRIER
1.
Remove oil pressure switch/sensor from end of exhaust cam carrier.
2.
Install an accurate engine oil pressure gage.
3.
Start engine and observe oil pressure. Minimum pressure cold engine: 40 PSI.
4.
Remove pressure tester and install switch/sensor.
IMPORTANT:
If pressure is nomal at the filter base but low or zero at the exhaust cam carrier the oil flow check valve is the probable cause.
If pressure is low or zero at the filter base, the oil pump is the probable cause.
Oil Flow Check Valve
OIL FLOW CHECK VALVE REMOVAL AND INSTALLATION
The oil flow check valve is located in the top of the block to the right of number one cylinder. The valve is press fit into the block and can be removed,
