Tools Required
| • | J 21867
Pressure Gage and Hose Assembly |
- With the vehicle on a level surface, run the vehicle for a few minutes, allow adequate drain down time (2-3 minutes)
and measure for a low oil level.
- If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
- Run the engine briefly (10-15 seconds) and verify low or no oil pressure on the vehicle gage or light.
- Listen for a noisy valve train or a knocking noise.
- Inspect for the following:
| • | Oil diluted by water or glycol (anti freeze) |
- Remove the oil filter and install the
J 42907
(1) .
- Install
J 21867
(2) or equivalent to the
J 42907
.
- Run the engine and measure the engine oil pressure.
- Compare the readings to
Engine Mechanical Specifications
.
- If the engine oil pressure is below specifications, inspect the engine for one or more of the following:
| • | 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 |
| • | Broken valve lash adjusters |
- If the reading on
J 21867
or equivalent is within specifications, inspect for the following:
| • | Plugged or incorrect oil filter and/or malfunctioning oil bypass valve |
| • | Malfunctioning vehicle oil pressure gage or sensor |
Low or No Oil Pressure
The following can cause low or no oil pressure:
| • | Low oil level -- fill to the full mark on the oil level indicator. |
| • | Incorrect or malfunctioning oil pressure switch -- replace
the oil pressure switch. |
| • | Incorrect or malfunctioning oil pressure gage -- replace
the oil pressure gage. |
| • | Improper oil viscosity or diluted oil |
| - | Install oil of proper viscosity for expected temperature. |
| - | Install new oil if it is diluted. |
| • | The oil pump is worn or dirty -- clean or replace the oil
pump. |
| • | The oil filter is plugged -- replace the oil filter. |
| • | The oil pickup screen is loose or plugged -- replace the
oil pickup screen. |
| • | A hole in the oil pickup tube -- replace the oil pickup tube. |
| • | Excessive bearing clearance -- replace the bearings. |
| • | Cracked, porous, or plugged oil galleries -- repair or replace
the engine block. |
| • | The gallery plugs are missing or improperly installed --
install or repair as necessary. |
| • | The pressure regulator valve is stuck. |
| - | Check the pressure regulator valve for sticking in the bore. |
| - | Check the bore for scoring and burrs. |
| • | The camshaft is worn or poorly machined -- replace the camshaft. |
| • | Worn valve guides -- repair as needed. |
Oil Pressure Testing
Tools Required
| • | J 42907 Oil
Pressure Tester Adapter |
If the vehicle has low oil pressure perform the following tests.
- Check the oil level.
- Raise the vehicle and remove the oil filter.
- Assemble the plunger valve in the large hole of J 42907
(1) base and the hose in the
small hole of J 42907
(1)
base. Connect the J 21867
(2)
to the end of the hose.
- Insert the flat side of the rubber plug in the bypass valve without
depressing the bypass valve itself.
- Install J 42907
(1) on the filter mounting pad.
- Start the engine and check the overall oil pressure and the oil pressure
switch. The engine should be at operating temperature before checking
the oil pressure. The oil pressure should be approximately 85kPa (12 psi)
at 1200 rpm using 5W30 engine oil.
- If adequate oil pressure is indicated, check the oil pressure
switch.
- 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.
