Inspection and/or Replacement
Crankshaft Bearings, Valve Rotators, and
Crankshaft Seals
The following components may not last until the
second overhaul.
• Thrust bearings
• Main bearings
• Rod bearings
• Valve rotators
• Crankshaft seals
Caterpillar Inc. recommends the installation of new
parts at each overhaul period.
Inspect these parts while the engine is disassembled
for an overhaul.
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 following
components:
• Rod bearing
• Main bearings
Note: If the crankshaft is removed for any reason,
use the magnetic particle inspection process to check
for cracks in the crankshaft.
Inspect the camshaft for damage to the journals and
to the lobes.
Note: If the 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 bearings
• Camshaft followers
Caterpillar Inc. recommends replacing the crankshaft
vibration damper.
Oil Cooler Core and Aftercooler Core
During an overhaul, Caterpillar Inc. recommends the
removal of both the oil cooler core and the aftercooler
core. Clean the oil cooler core and the aftercooler
core. Then, pressure test both of these cores.
NOTICE
Do not use caustic cleaners to clean the core.
Caustic cleaners can attack the internal metals of the
core and cause leakage.
Note: Use this cleaning procedure to clean the oil
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: Caterpillar Inc. recommends the use of
Hydrosolv Liquid Cleaners. Table 22 lists the
Hydrosolv Liquid Cleaners that are available from
your Caterpillar dealer.
Table 22
Hydrosolv Liquid Cleaners
(1)
Part Number
Description
Size
1U-5490
Hydrosolv 4165 19 L (5 US gallon)
174-6854
Hydrosolv 100 19 L (5 US gallon)
(1)
Use a two to five percent concentration of the cleaner at tem-
peratures up to 93°C (200°F).
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.
5. Wash the oil cooler core and the aftercooler core
with hot, soapy water. Rinse the oil cooler core
and the aftercooler core thoroughly with clean
water.
146
SEBU7125-13
Maintenance Section
Overhaul Considerations
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