Lubrication System
i02648880
Engine
Oil
Pressure
-
Test
Low Oil Pressure
The following conditions will cause low oil pressure.
• The oil level is low in the crankcase.
•
A restriction exists on the oil suction screen.
• Connections in the oil lines are leaking.
• The connecting rod or the main bearings are worn.
• The rotors in the oil pump are worn.
• The oil pressure relief valve is operating
incorrectly.
A worn oil pressure relief valve can allow oil to leak
through the valve which lowers the oil pressure.
The minimum oil pressure at the maximum engine
speed and at normal operating temperature is
315 kPa (45 psi). A lower pressure is normal at low
idle.
A suitable pressure gauge can be used in order to
test the pressure of the lubrication system.
High Oil Pressure
High oil pressure can be caused by the following
conditions.
• The spring for the oil pressure relief valve is
installed incorrectly.
• The plunger for the oil pressure relief valve
becomes jammed in the closed position.
• Excessive sludge exists in the oil which makes the
viscosity of the oil too high.
i02400036
Engine Oil Pump - Inspect
If any part of the oil pump is worn enough in order to
affect the performance of the oil pump, the oil pump
must be replaced.
Perform the following procedures in order to inspect
the oil pump. Refer to the Specifications Module,
“Engine Oil Pump” for clearances and torques.
Illustration 33
g00938064
1.
Remove the oil pump from the engine. Remove the
cover of the oil pump.
2.
Remove the outer rotor (1). Clean all of the parts.
Look for cracks in the metal or other damage.
3.
Install the outer rotor. Measure the clearance of the
outer rotor to the body .
Illustration 34
g00938061
Clearance for the inner rotor body
4.
Measure the clearance of the inner rotor to the
outer rotor (2).
34
UENR0617
This document has been printed from SPI2. NOT FOR RESALE.