88
Maintenance Section
Overhaul Considerations
•
Increased fuel consumption
Reduced engine efficiency and increased fuel
consumption translates into higher operating costs.
Therefore, Caterpillar Inc. recommends repairing
out-of-spec parts or replacing out-of-spec parts.
Component Replacement
Replace the following components during the
overhaul:
•
Piston Rings
•
Thrust bearings
•
Main bearings
•
Connecting rod bearings
•
Gaskets and seals
•
Engine mounts
•
Hoses
Inspection
Inspect the following components according to
the instructions that are in Caterpillar reusability
publications. Refer to Guidelines for Reusable
Parts and Salvage Operations, SEBF8029, “Index
of Publications on Reusability or Salvage of Used
Parts”.
•
Camshaft
•
Camshaft bearings
•
Crankshaft
•
Crankshaft vibration damper
•
Gear train
Inspect the camshaft for damage to the journals
and the lobes. Inspect the camshaft bearings for
signs of wear and/or for signs of fatigue.
Inspect the crankshaft for any of the following
conditions:
•
Deflection
•
Damage to the journals
•
Bearing material that has seized to the journals
Check the journal taper and the profile of the
crankshaft journals. Check these components by
interpreting the wear patterns on the rod bearings
and main bearings.
Note: If the crankshaft or the camshaft are removed
for any reason, use the magnetic particle inspection
process to check for cracks.
Replace the crankshaft vibration damper if any of
the following conditions are found:
•
Engine failure due to a broken crankshaft
•
Excessive wear of the front main bearing
•
Excessive wear of the gear train that is not
caused by a lack of lubrication
•
Visconic damper that is dented, cracked, or
leaking
•
Visconic damper that is discolored from heat
•
Rubber damper that is deteriorated and cracked
•
Rubber damper with slippage of the outer ring
Inspect the gear train for the following conditions:
•
Worn gear teeth
•
Unusual fit
•
Unusual wear
Testing
Test the following components during the overhaul:
•
Fuel injection nozzles
•
Fuel injection pump
•
Governor
Testing the fuel system during the overhaul will
ensure that your engine operates at peak efficiency.
Your Caterpillar dealer can provide these services
and components in order to ensure that your
fuel system is operating within the appropriate
specifications.
Cleaning
The following components should be cleaned and
pressure tested during the overhaul:
•
Engine oil cooler
•
Marine gear oil cooler
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