Lubrication System; Engine Oil Pressure - Test; Engine Oil Pump - Inspect; Excessive Bearing Wear - Inspect - Perkins 854E-E34TA Systems Operation Testing And Adjusting

68

Lubrication System

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 400 to 480 kPa (58.016 to 69.619 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

1. Remove the oil pump from the engine.
2. Clean the engine oil pump.
3. Look for cracks in the metal or other damage to the
engine oil pump. If necessary, replace the engine
oil pump.
This document is printed from SPI². Not for RESALE
4. Install the oil pump on the engine.
5. Remove the engine oil pressure relief valve from
the engine.
6. Inspect the engine oil pressure relief valve for wear
i04169630
of for damage. If necessary, replace the engine oil
pressure relief valve.
Excessive Bearing Wear -
Inspect
When some components of the engine show bearing
wear in a short time, the cause can be a restriction in
an oil passage.
An engine oil pressure indicator may show that there
is enough oil pressure, but a component is worn due
to a lack of lubrication. In such a case, look at the
passage for the oil supply to the component. A
restriction in an oil supply passage will not allow
enough lubrication to reach a component. Early wear
will result.
Refer to Specifications for more information regarding
component wear limits.
Excessive Engine Oil
Consumption - Inspect
Engine Oil Leaks on the Outside of
the Engine
Check for leakage at the seals at each end of the
crankshaft. Look for leakage at the gasket for the
engine oil pan and all lubrication system connections.
Look for any engine oil that may be leaking from the
crankcase breather. This can be caused by
combustion gas leakage around the pistons. A dirty
crankcase breather will cause high pressure in the
crankcase. A dirty crankcase breather will cause the
gaskets and the seals to leak.
Engine Oil Leaks into the
i04484013
Combustion Area of the Cylinders
Engine oil that is leaking into the combustion area of
the cylinders can be the cause of blue smoke. There
are several possible ways for engine oil to leak into
the combustion area of the cylinders:
UENR0623
i04027269
i02414692