User Manual

SENR9977 43
TestingandAdjustingSection
Lubrication System
i01854908
Engine O il Pres sure - Test
Low Oil Press
ure
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
theoilpumpareworn.
•
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.
Refer to the S
pecifications Module, “Engine Oil Relief
Valve” for the correct operating pressure and other
information.
When the engine runs at the normal temperature for
operation and at high idle, the oil pressure must be
a minimum of
280 kPa (40 psi). A lower pressure is
normal at low idle.
Asuitablep
ressure gauge can be used in order to
test the pressure of the lubrication system.
High Oil P ressure
High oil pre
ssure can be caused by the following
conditions.
•
The spring
for the oil pressure relief valve is
installed incorrectly.
•
The plunge
r 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.
i01893791
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 for
clearances and torques.
Refer to the Specifications Module, “Engine Oil
Pump”.
1. Remove the oil pump from the engine. Refer to
the Disassemb
ly and Assembly, “Engine Oil Pump
- Remove”. Remove the cover of the oil pump.
2. Remove the out
er rotor. Clean all of the parts.
Look for cracks in the metal or other damage.
g00985779
Illustration 50
Clearance for the outer rotor body
(1) Measure the clearance of the outer rotor to the body.
3. Install the outer rotor. Measure the clearance of
the outer rotor to the body (1).