Oil Pressure Diagnosis and Testing
Special Tools
KM-498-B Oil Pressure Gauge Adapter
For equivalent regional tools, refer to
Special Tools .
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With the vehicle on a level
surface, allow adequate drain down time of 2-3 minutes and measure
for a low oil level. |
| |
Add the recommended grade engine oil and fill the crankcase
until the oil level measures full on the oil level indicator. |
| • |
Run the engine, and verify
low, or no oil pressure on the vehicle gauge or light. |
| |
Listen for a noisy valve train or a knocking noise. |
| • |
Inspect for the
following: |
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Oil diluted by
moisture or unburned fuel mixtures |
| |
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Improper oil
viscosity for the expected temperature |
| |
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Incorrect or
malfunctioning oil pressure sender |
| |
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Incorrect or
malfunctioning oil pressure gauge |
| |
- |
Malfunctioning
oil bypass valve |
| • |
Remove the oil pressure sender
or another engine block oil gallery plug. |
| • |
Install the KM-498-B
adapter and an oil pressure gauge and measure the engine oil
pressure. |
| • |
If the engine oil pressure is
below specifications, inspect the engine for one or more of the
following: |
| |
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Oil pump screen
loose, plugged, or damaged |
| |
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Oil pump screen
O-ring seal missing or damaged |
| |
- |
Oil pump to oil
pump pipe and screen assembly gasket missing or damaged
|
| |
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Oil pump pipe and
screen assembly restrictions or damaged |
| |
- |
Oil pump driven
gear damaged or loose |
| |
- |
Oil pump drive
gear damaged |
| |
- |
Malfunctioning
oil pump pressure regulator valve |
| |
- |
Cracked, porous
or restricted oil galleries |
| |
- |
Oil cooler
restrictions |
| |
- |
Oil cooler
O-rings damaged or missing |
| |
- |
Cracked, porous
or restricted oil galleries |
| |
- |
Damaged or
missing oil spray cooling nozzles |
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