User Manual

RENR9968-02 45
Testing and Adjusting Section
NOTICE
Care must be taken to ensure that fluids are contained
during performance of inspection, maintenance, test-
ing, adjusting and repair of the product. Be prepared to
collect the fluid with suitable containers before open-
ing any compartment or disassembling any compo-
nent containing fluids.
Refer to Spe cia l Publication, NENG2500 , “Caterpillar
Dealer Service Tool Catalog” for tools and supplies
suitable to collect and contain fluids on Caterpillar
products.
Dispose of all fluids according to local regulations and
mandates.
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
in the engine oil system could be the cause for the
restriction of the oil fl ow and the movement of the
engine oil bypass valv es. If the engine oil byp ass
valves are stuck in the closed position , rem ove each
bypass valve and clean each bypass valve in order
to correct this problem. You must also clean each
bypass valve bore. Install new engine oil filters.
New engine oil filters will prevent more debris from
causing this prob lem. R efer to the D isassembly and
Assembly manual for more inform at ion on servicing
the bypass valves and the oil filters.
NOTICE
Caterpillar oil filters are built to Caterpillar speci-
fications. Use of an oil filter not recommended by
Caterpillar could result in severe engin e damage to
the engine bearings, crankshaft, etc., as a result of
the larger waste particles from u n filtered oil entering
the engine lu bricating system. Only use oil filters
recomm ended by Caterpillar.
i01432243
Engine Oil Pump - Inspect
SMCS Code: 1304-040
The inlet screen of the supply tube for the engine
oil pump can have a restriction. This will cause
cavitation and a loss of o il pressure. Air leakage in
the supply side of the engine oil pump will also cause
cavitation and loss of oil pressure. If the bypass valve
for the engine oil pump is held in the open position,
the lubric ation system cannot achiev e maximum
pressure. Oil pump gears that have too much wear
will cause a reduction in the oil pressure.
If any part of the engine oil pump is worn enough
in order to affect the performance of the engine oil
pump, the engine oil pump must be re placed. Refer
to Specifications, “Engine Oil Pump” for clearances.
i01126690
Excessive Bearing Wear -
Inspect
SMCS Code: 1203-040; 1211-040; 1219-040
When some compon ents of the e ng ine 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
duetoalackoflubrication.Insuchacase,lookat
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. This will
result in early wear.
i02487769
Excessive Engine Oil
Consumption - Inspect
SMCS Code: 1348-040
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 causehighpressureinthe
crankcase. A dirty crankcase breather will cause the
gaskets and the seals to leak.
Engine Oil Leaks into the
Combustion Area of the C ylinders
Engine oil that is leaking into the combustion area of
thecylinderscanbethecauseofbluesmoke.There
are several possible ways for engine oil to leak into
the combustion area of the cylinders:
•
Leaks between worn valve guides and valve stems
•
Worn components or damaged components
(pistons, piston rings, or dirty return holes for the
engine o il)
•
Incorrect installation of the compression ring and/or
the intermediate ring
•
Leaks past the seal rings in the turbocharger shaft
•
Overfilling of the crankcase