Component Tests and General Diagnostics

^ Tools Required
- J25087-C Oil Pressure Test Kit

If the vehicle has low oil pressure perform the following tests.
1. Check the oil level.
2. Raise the vehicle and remove the oil filter.
3. Assemble the plunger valve in the large hole of J 25087-C base and the hose in the small hole of J 25087-C base. Connect the gauge to the end of the hose.
4. Insert the flat side of the rubber plug in the bypass valve without depressing the bypass valve itself.
5. Install J 25087-C on the filter mounting pad.
6. Start the engine and check the overall oil pressure, the oil pressure switch, and for noisy lifters. The engine should be at operating temperature before checking the oil pressure. The oil pressure should be approximately 414kPa (60 psi) at 1850 rpm using 1OW30 engine oil.
7. If adequate oil pressure is indicated, check the oil pressure switch.
8. If a low reading is indicated, press the valve on the tester base to isolate the oil pump and/or its components from the lubricating system. An adequate reading at this time indicates a good pump and the previous low pressure was due to worn bearings, etc. A low reading while pressing the valve would indicate a faulty pump.