Oil Pressure Test
- Remove the oil pressure switch (1) from the engine block.
- Install a pressure gauge in place of the oil pressure switch.
- Start the engine and run at idle until normal operating temperature is reached.
- Raise the engine speed to 4000 RPM and measure the oil pressure.
- If the oil pressure is below specification refer to the following table.
- Stop the engine.
- Remove the pressure gauge.
- Install the oil pressure switch.
- Run the engine and inspect for oil leaks from the oil pressure switch.
Normal Oil Pressure
330-430 kPa (47-61 psi) at 4000 RPM
Tighten
Tighten the oil pressure switch to 14 N·m (10 lb ft).
Problem | Action | ||||||
|---|---|---|---|---|---|---|---|
The oil level is low. | Fill the oil to the FULL mark on the oil level indicator. | ||||||
The idle speed is low or unstable. | Refer to Engine Controls. | ||||||
The oil pressure switch is incorrect or malfunctioning. | Replace the oil pressure switch. | ||||||
The oil pressure indicator is incorrect or malfunctioning. | Replace the oil pressure indicator. | ||||||
The oil viscosity is improper. | Use oil of the proper viscosity for the expected temperature. | ||||||
The oil is diluted with one of the following materials:
| Fill with new oil. | ||||||
The oil pump is worn or dirty. | Replace or clean the oil pump as necessary. | ||||||
The oil filter is plugged. | Replace the oil filter. | ||||||
The oil pickup screen is loose or plugged. | Adjust or replace the screen as necessary. | ||||||
The oil pickup tube has a hole. | Replace the tube. | ||||||
The oil pickup tube O-ring is faulty. | Replace the O-ring. | ||||||
The bearing clearance is excessive. | Replace the bearings as necessary. | ||||||
The oil galleries display one of the following conditions:
| Repair or replace the block as necessary. | ||||||
The gallery plugs or cylinder head oil jet are missing or incorrectly installed. | Install the plugs / oil jet and repair as necessary. | ||||||
The oil pump pressure regulator valve is malfunctioning. | Inspect and replace the valve. | ||||||
The camshaft or cylinder head is worn or poorly machined. | Replace the camshaft and or the cylinder head. | ||||||
The valve guides are worn. | Replace the guides. |
