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7. Install J 21867 or equivalent to the. See Special Tools and Equipment . J 42907 .
8. Run the engine and measure the engine oil pressure.
9. Compare the readings to Engine Mechanical Specifications (LS1) or Engine Mechanical
Specifications (LS6) .
10. If the engine oil pressure is below specifications, inspect the engine for one or more of the following
conditions:
Oil pump worn or dirty
Refer to Oil Pump Cleaning and Inspection .
Oil pump-to-engine block bolts loose
Refer to Oil Pump, Pump Screen and Deflector Installation .
Oil pump screen loose, plugged, or damaged
Oil pump screen O-ring seal missing or damaged
Malfunctioning oil pump pressure regulator valve
Excessive bearing clearance
Cracked, porous, or restricted oil galleries
Oil gallery plugs missing or incorrectly installed
Refer to Engine Block Plug Installation .
Broken valve lifters
Repair as necessary
11. If the oil pressure reading on the J 21867 or equivalent is within specifications, inspect for the following
conditions:
Plugged or incorrect oil filter and/or malfunctioning oil bypass valve
Malfunctioning oil pressure gage or sensor
Repair as necessary.
OIL LEAK DIAGNOSIS
Oil Leak Diagnosis
Step
IMPORTANT:
You can repair most fluid leaks by first visually locating the leak, repairing or replacing the
component, or by resealing the gasket surface. Once the leak is identified, determine the cause of
the leak. Repair the cause of the leak as well as the leak itself.
Action
Yes
No
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