
118 SEBU8219-01
Maintenance Section
Overhaul Considerations
Reduced engine
efficiency and increased fuel
consumption translates into higher operating costs.
Therefore, Caterpillar Inc. recommends repairing
out-of-spec p
arts or replacing out-of-spec parts.
Inspection and/or Replacement
Piston Rings, Crankshaft Bearings, Valve
Rotators, and Crankshaft Seals
The following components may not last until the
second overhaul.
•
Thrust bearings
•
Main bearing
s
•
Rod bearings
•
Valve rotators
•
Crankshaft s
eals
Caterpillar Inc. recommends the installation of new
parts at each
overhaul period.
Inspect these parts while the engine is disassembled
for an overha
ul.
Inspect the crankshaft for any of the following
conditions
:
•
Deflection
•
Damage to the journals
•
Bearing mat
erial 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 following
components:
•
Rod bearing
•
Main bearin
gs
Note: If the crankshaft is removed for any reason,
use the mag
netic particle inspection process to check
for cracks in the crankshaft.
Inspect th
e camshaft for damage to the journals and
to the lobes.
Note: If th
e camshaft is removed for any reason, use
the magnetic particle inspection process to check for
cracks in the camshaft.
Inspect the following components for signs of wear or
for signs of scuffing:
•
Camshaft beari
ngs
•
Camshaft followers
Caterpillar Inc. recommends replacing the crankshaft
vibration damper.
Oil Cooler Core and Aftercooler Core
During an over
haul, the removal of the oil cooler
core and the aftercooler core is recommended. The
oil cooler core and the aftercooler core should be
cleaned and p
ressure tested.
NOTICE
Do not use caustic cleaners to clean the core.
Caustic cleaners can attack the internal metals of the
core and cause leakage.
Note: Usethiscleaningproceduretocleantheoil
cooler core and the aftercooler core.
1. Remove the oil cooler core and the aftercooler
core.
2. Remove any debris from the oil cooler core and
the aftercooler core. To remove debris from the oil
cooler core, turn the oil cooler core onto one end.
To remove debris from the aftercooler core, turn
the aftercooler core upside-down.
3. Flush the oil cooler core and the aftercooler core
internally with cleaner in order to loosen foreign
substances. This will also help to remove oil from
the oil cooler core and the aftercooler core.
Note: The use of Hydrosolv Liquid Cleaners is
recommended. Table 18 lists the Hydrosolv Liquid
Cleaners that are available from your Caterpillar
dealer.
Table 1 8
Hydrosolv Liquid Cleaners
(1)
Part
Number
Description Size
1U-5490 Hydrosolv 4165
19L(5USgallon)
174-6854 Hydrosolv 100
19L(5USgallon)
(1)
Use a two to five percent conc entration of the cleaner
at temp eratures up to 93°C (200°F). Refer to Application
Guide, NEHS0526 or consult y our Caterpillar dealer for more
information.
4. Use steam to clean the oil cooler core and the
aftercooler core. This removes any remaining
residue from the cleaner. Flush the fins of the oil
cooler core and the aftercooler core. Remove any
other trapped debris.