Lubrication System; Engine Oil Pressure - Test; Engine Oil Pump - Inspect - Perkins 1204F-E44TA Systems Operation Testing And Adjusting

UENR4490-01

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.
The minimum oil pressure at a maximum engine
speed of 2200 rpm and at normal operating
temperature is 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.
This document has been printed from SPI2. NOT FOR RESALE
Perform the following procedures in order to inspect
the oil pump. Refer to Specifications, "Engine Oil
Pump" for clearances and torques.
i03994210
Illustration 101
Typical example
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 102
Typical example
4. Measure the clearance of the inner rotor to the
outer rotor (2).
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107
Lubrication System
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