Lubrication System; Engine Oil Pressure - Test; Engine Oil Pump - Inspect - Perkins 1104D NH1 Systems Operation Testing And Adjusting

RENR7967

Lubrication System

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.
Refer to the Specifications 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.
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.

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.
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Refer to the Specifications Module, "Engine Oil
Pump".
1. Remove the oil pump from the engine. Refer to
the Disassembly and Assembly, "Engine Oil Pump
- Remove". Remove the cover of the oil pump.
2. Remove the outer rotor. Clean all of the parts.
Look for cracks in the metal or other damage.
Illustration 58
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).
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Testing and Adjusting Section
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