Mack ASET AC, Руководство по обслуживанию, Страница: 525 / 536

Page 512
APPENDIX
If it is not possible to see inside the manifold, a
piece of wire or similar object could be inserted
into the manifold and used to check if oil is
present. Accumulated oil can be removed with a
suction pump by removing the air compressor
boost pressure supply line and fitting located at
the rear of the manifold, then inserting a suction
pump hose into the opened port. Make sure the
hose extends all the way to the bottom of the
manifold. Using this method ensures that oil
accumulated at the rear of the manifold will be
removed.
In most instances, the engine is mounted in the
chassis tilted toward the rear. Because of this, oil
will collect at the back of the inlet manifold
making it possible for some oil to enter cylinder
No. 6. If enough oil enters the cylinder, hydraulic
lock could occur and result in severe damage
when attempting to start the engine. To avoid
such damage, use the barring tool to rotate the
engine several revolutions before starting.
Resistance felt as the engine is rotated (as
cylinder No. 6 approaches TDC of the
compression stroke), indicates that oil may be
present in the combustion chamber. To remove
this oil, remove the injection nozzle from cylinder
No. 6 and rotate the engine several more
revolutions to push the oil from the cylinder.
Before reinstalling the nozzle, clean the oil from
the nozzle hole in the cylinder head.
Cleaning Oil from the Charge Air
Cooler
Oil can be removed from the charge air cooler as
follows:
1. Remove the charge air cooler and flush the
inside with a safety solvent to remove oil and
other debris.
2. Shake the cooler from side-to-side to
remove large pieces.
3. Wash the cooler with hot, soapy water (use
liquid gel automatic dishwasher detergent to
minimize foaming). Rinse with clean water
and blow dry with compressed air in the
reverse direction of flow.
4. Carefully inspect the cooler to ensure
cleanliness.
Do not use caustic cleaners when flushing the
cooler. Be extremely careful when handling the
cooler so as not to damage the core.
When flushing the charge air cooler, it is
recommended that the cooler be turned upside
down and a reverse flow be used to flush the
inside.
If oil and debris are still evident inside the charge
air cooler after it has been thoroughly cleaned,
contact the Mack Trucks, Inc. Warranty
Department to authorize replacement.
Cleaning the Intake Air System
When a turbocharger fails, debris from the
compressor wheel and surrounding area has very
high inertia and can travel throughout the intake
air piping and into the air cleaner. Additionally,
small metal pieces resulting from the failure are
extremely hot and will melt into and stick to the
insides of the plastic hoses and tubing. All these
pieces must be removed from the intake air
system. Because the turbocharger wheels spin at
such high speeds, even a small piece of debris
can throw the wheels out of balance, resulting in
eventual failure of the replacement turbocharger.
The intake air ducts should be disassembled and
the insides of the ducts, elbows, hoses, etc.,
carefully checked for debris and cleaned as
necessary. The air filter element should also be
removed, inspected (be sure to check the inside
of the filter) and replaced as necessary.
Thoroughly clean the inside of the air cleaner
canister of any debris.
5-111.bk Page 512 Monday, July 10, 2006 2:26 PM