Oil Pressure Diagnosis and Testing
| Oil Pressure Diagnosis and Testing |
Special Tools
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EN-21867
Pressure Gauge
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EN-21867-6
Oil Pressure Adapter Fitting
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| 1. |
Let the engine run a few minutes while the vehicle is parked on a level surface. Let the oil run out of the system (2-3 minutes) and check whether the engine oil level is low.
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| 2. |
If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
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| 3. |
Run the engine briefly, 10-15 seconds, and verify low or no oil pressure on the vehicle gauge or light.
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| 4. |
Listen for a noisy valve train or a knocking noise.
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| 5. |
Verify the following:
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Foamy oil
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Slow idle speed
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Plugged oil filter
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Oil diluted by the following:
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Water
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Engine coolant
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Unburned fuel mixtures
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Malfunctioning oil filter bypass valve
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Incorrect or faulty oil pressure gauge
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Incorrect or faulty oil pressure gauge sensor
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Improper engine oil viscosity for the expected temperature
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| 6. |
Remove the engine oil pressure sensor. Refer to
Engine Oil Pressure Sensor Replacement
.
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| 7. |
Install the
EN-21867
pressure gauge with the
EN-21867-6
oil pressure adapter fitting.
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| 8. |
Measure the engine oil pressure.
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| 9. |
Compare the readings to the
Engine Mechanical Specifications
.
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| 10. |
If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:
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Loose oil filter adapter bolts
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Missing or damaged oil filter adapter O-ring seal or seals
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Oil pump worn or dirty
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Loose oil pump-to-engine block bolts
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Loose, plugged or damaged oil pump screen
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Missing or damaged oil pump screen O-ring seal
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Damage or leak in the oil pump screen suction tube
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Malfunctioning oil pump pressure regulator valve
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Missing or incorrectly installed oil gallery plugs
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Loose camshaft intermediate drive shaft bolts
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Excessive bearing clearance for the following:
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Connecting rod or rods
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Crankshaft
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Camshaft or camshafts
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Camshaft intermediate drive shaft sprocket
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Cracked, porous or restricted oil galleries
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Broken valve lifters
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| 11. |
Repair or replace the components, as required.
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