Excessive Bearing Wear

TM 9-2320-312-24-2

Testing and Adjusting Section

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NOTICE

Excessive Bearing Wear -

Care must be taken to ensure that fluids are contained

Inspect

during performance of inspection, maintenance, test-

ing, adjusting and repair of the product. Be prepared to

collect the fluid with suitable containers before open-

SMCS Code: 1203-040; 1211-040; 1219-040

ing any compartment or disassembling any compo-

nent containing fluids.

When some components of the engine show

bearing wear in a short time, the cause can be a

Refer to Special Publication, NENG2500, "Caterpillar

restriction in an oil passage.

Tools and Shop Products Guide" for tools and supplies

suitable to collect and contain fluids on Caterpillar

An engine oil pressure indicator may show that there

products.

is enough oil pressure, but a component is worn

due to a lack of lubrication. In such a case, look at

Dispose of all fluids according to local regulations and

the passage for the oil supply to the component. A

mandates.

restriction in an oil supply passage will not allow

enough lubrication to reach a component. This will

result in early wear.

Engine oil pressure will be high if the engine oil

bypass valves become stuck in the closed position

and the engine oil flow is restricted. Foreign matter

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in the engine oil system could be the cause for the

Excessive Engine Oil

restriction of the oil flow and the movement of the

engine oil bypass valves. If the engine oil bypass

Consumption - Inspect

valves are stuck in the closed position, remove

each bypass valve and clean each bypass valve in

SMCS Code: 1348-040

order to correct this problem. You must also clean

each bypass valve bore. Install new engine oil

Oil Leakage On Outside Of Engine

filters. New engine oil filters will prevent more debris

from causing this problem. For information on the

repair of the engine oil filter bypass valve, refer to

Check for leakage at the seals at each end of the

Disassembly and Assembly, "Engine Oil Filter Base

crankshaft. Look for leakage at the oil pan gasket

- Disassemble".

and all lubrication system connections. Look for any

oil that may be leaking from the crankcase breather.

This can be caused by combustion gas leakage

NOTICE

around the pistons. A dirty crankcase breather

Caterpillar oil filters are built to Caterpillar speci-

will cause high pressure in the crankcase. A dirty

fications. Use of an oil filter not recommended by

crankcase breather will cause the gaskets and the

Caterpillar could result in severe engine damage to

seals to leak.

the engine bearings, crankshaft, etc., as a result of

the larger waste particles from unfiltered oil entering

Oil Leakage Into Combustion Area

the engine lubricating system. Only use oil filters

recommended by Caterpillar.

Of Cylinders

Oil leakage into the combustion area of the cylinders

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can be the cause of blue smoke. There are four

Engine Oil Pump - Inspect

possible ways for oil leakage into the combustion

area of the cylinders:

SMCS Code: 1304-040

Oil leakage between worn valve guides and valve

stems

If any part of the engine oil pump is worn enough

in order to affect the performance of the engine oil

Worn components or damaged components

pump, the engine oil pump must be replaced. Refer

(pistons, piston rings, or dirty oil return holes)

to the Specifications Module, "Engine Oil Pump"

topic for clearances.

Incorrect installation of the compression ring

and/or the intermediate ring

Oil leakage past the seal rings in the impeller end

of the turbocharger shaft