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TM 9-2320-312-24-2
Testing and Adjusting Section
i01126690
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
i01282970
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
i01378651
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

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