- With the vehicle on a level surface, allow adequate drain down
time, 2-3 minutes, and measure for a low engine oil level.
Add the recommended grade engine oil, and fill the crankcase until the
oil level measures FULL on the oil level indicator.
- Operate the engine and verify low or no oil pressure on the vehicle
oil pressure gage or the oil indicator light.
Listen for a noisy
valve train or a knocking noise.
- Inspect for the following:
| • | Engine oil diluted by moisture or unburned fuel mixtures |
| • | Improper engine oil viscosity for the expected temperature |
| • | Incorrect or faulty oil pressure gage sensor |
| • | Incorrect or faulty oil pressure gage |
| • | Malfunctioning oil filter bypass valve |
- Remove the oil pressure gage sensor or another engine block oil
gallery plug.
- Install an oil pressure gage.
- Start the engine and then allow the engine to reach normal operation
temperature.
- Measure the engine oil pressure at the following RPM:
Specification
- 42 kPa (6 psig) minimum, at 1,000 RPM
- 125 kPa (18 psig) minimum, at 2,000 RPM
- 166 kPa (24 psig) minimum, at 4,000 RPM
- If the engine oil pressure is below minimum specifications, inspect
the engine for one or more of the following:
| • | Malfunctioning oil pump pressure relief valve |
| • | Oil pump screen loose, plugged, or damaged |
| • | Excessive bearing clearance |
| • | Cracked, porous or restricted oil galleries |
| • | Engine block oil gallery plugs missing or incorrectly installed |
