Lubrication System; Engine Oil Pressure - Test; Engine Oil Pump - Inspect - Perkins 1103 Series Workshop Manual

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,
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

i01854908
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,
Pump
1. Remove the oil pump from the engine. Refer
2. Remove the outer rotor. Clean all of the parts.
" Engine Oil
Illustration 31
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
Testing and Adjusting Section
" .
to the Disassembly and Assembly,
Pump - Remove " . Remove the cover of the oil
pump.
Look for cracks in the metal or other damage.
the outer rotor to the body (1).
35
i01893791
" Engine Oil
" Engine Oil
g00985779