2006 TrailBlazer 2WD V8-60L VIN H Engine Oil Pressure Diagnostic Testing Page
Engine Oil Pressure: Testing and Inspection
Oil Pressure Relief Valve Diagnosis and Testing
Oil Pressure Relief Valve Diagnosis and Testing
^
Tools Required
-
J 21867 Pressure Gage
-
J 21867-16 Oil Pressure Adapter
-
J 42907 Oil Pressure Tester
Important: This test is performed to verify the operation of the oil pressure relief valve mounted in the oil pan. Refer to Lubrication Description
(Component Locator) Lubrication Description (Main Pressure Below 55 psi) Lubrication Description (Main Pressure Above 55 psi).
1. With the vehicle on a level surface, run the vehicle for a few minutes, allow adequate drain down time, 2-3 minutes, and measure the oil level.
2. If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
3. Run the engine briefly, 10-15 seconds, and verify low or no oil pressure on the vehicle gage or light.
4. Listen for a noisy valve train or a knocking noise.
5. Inspect for the following conditions:
^
Oil diluted by water or glycol antifreeze
^
Foamy oil
6. Remove the oil filter and install the J 42907 (1).
7. Install J 21867 (2), or equivalent to the J 42907 (1).
8. Remove the oil pressure sensor and install the J-21867-16.
