- 103 -
6. Oil pressure relief valve worn or stuck in the OPEN
position.
7. Oil filter bypass valve stuck open. Oil filter is
restricted. Replace oil filter.
High Oil Pressure
Oil pressure will be high if the oil pressure relief valve
in the oil pump cannot move from the closed position.
Too Much Component Wear
When some components of the engine show bearing
wear in a short time, the cause can be a restriction in an
oil passage. A broken oil passage can also be the cause.
If an oil pressure check is done and the oil pressure is
correct, but a component is worn because it does not
get enough lubrication, look at the passage for oil
supply to that component. A restriction in a supply
passage will not let enough lubrication get to a
component and this will cause early wear.
Oil Pressure Check
Oil Pressure Check
(1) LP pressure switch. (two terminals)
(2) Oil pressure switch. (one terminal)
1. With the engine OFF, make sure the oil level is
correct. Connect the analyzer to the engine as
shown in Engine RPM Check in the Testing And
Adjusting.
Before the LP/oil pressure switch is removed, the
engine must be stopped. Make sure oil pressure is
released to prevent personal injury.
2. Remove LP pressure switch (1) or oil pressure
switch (2). Install the pressure gauge in adapter.
3. Start the engine and allow it to warm up to normal
operating temperature.
4. Run the engine at 2000 rpm. Read the pressure
gauge.
5. The oil pressure must be approximately 124 kPa
(18 psi) at 2000 rpm. There is no adjustment to the
oil pressure relief valve.
For the possible cause see Lubrication System
Problems in Troubleshooting.
NOTE: A lower pressure indication, 28 kPa (4 psi), is
normal at low idle speed.
For changing Engine Oil and Filter, See Maintenance
Section
WARNING
LP Engine G430 (3.0L)
Lubrication System
1
2
