All vehicles
- Run the engine until normal operating temperature is reached.
- Run the engine at the specified rpm and record the gauge reading.
- The oil pressure should be within specifications. Refer to the appropriate Service Information procedure for each engine for the acceptable oil pressure range and specific vehicle requirements.
- If the pressure is not within specification, check the following possible sources:
Visual Inspection Chart
Mechanical Insufficient oil
Oil leakage
Worn or damaged oil pump
Oil pump screen cover and tube
Excessive main bearing clearance
Excessive connecting rod bearing clearance
Chain tensioner leak