
SEBU8219-01 97
Maintenance Section
Crankshaft Vibration Damper - Inspect
A water tempera
ture regulator that fails in the open
position will cause the engine operating temperature
to be too low during partial load operation. Low
engine operat
ing temperatures during partial loads
could cause an excessive carbon buildup inside the
cylinde rs. This excessive carbon buildup could result
in an acceler
ated wear of the piston rings and wear
of the cylinder liner.
NOTICE
Failure to re
place your water temperature regulator
on a regularly scheduled basis could cause severe
engine damage.
Caterpillar engines incorporate a shunt design cooling
system and require operating the engine with a water
temperatur
e regulator installed.
If the water temperature regulator is installed incor-
rectly, the
engine may overheat, causing cylinder head
damage. Ensure that the new water temperature reg-
ulator is installed in the original position. Ensure that
the water t
emperature regulator vent hole is open.
Do not use liquid gasket material on the gasket or
cylinder h
ead surface.
Refer to two articles in the Disassembly and
Assembly M
anual, “Water Temperature Regulators
- Remove and Water Temperature Regulators -
Install” for the replacement procedure of the water
temperatu
re regulator, or consult your Caterpillar
dealer.
Note: If o
nly the water temperature regulators are
replaced, drain the coolant from the cooling system to
a level that is below the water temperature regulator
housing.
i02933380
Cranksh aft Vibration Damper
- Inspect
SMCS Code: 1205-040
Damage to the crankshaft vibration damper or failure
of the crankshaft vibration damper can increase
torsional vibrations. This can result in damage to
the crankshaft and to other engine components. A
damper that is damaged can cause excessive gear
train noise at variable points in the speed range.
The damper is mounted to the crankshaft which is
located behind the belt guard on the front of the
engine.
Visconic Damper
The visconic da
mper has a weight that is located
inside a fluid filled case. The weight moves in the
case in order to limit torsional vibration.
Inspect the damper for evidence of fluid leaks. If
a fluid leak is found, determine the type of fluid.
The fluidinth
e damper is silicone. Silicone has
the following characteristics: transparent, viscous,
smooth, and adhering.
If the fluid leak is oil, inspect the crankshaft seals for
leaks. If a leak is observed, replace the crankshaft
seals.
Inspect the damper and repair or replace the damper
for any of the
following reasons:
•
The damper is dented, cracked, or leaking.
•
The paint on the damper is discolored from heat.
•
The engine h
as had a failure because of a broken
crankshaft.
•
Analysis of
the oil has revealed that the front main
bearing is badly worn.
•
There is a la
rge amount of gear train wear that is
not caused by a lack of oil.
Refer to the
Disassembly and Assembly Manual,
“Vibration Damper and Pulley - Remove and Install”
or consult your Caterpillar dealer for information
about damp
er replacement.
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4
Electrical Co nnections - Check
SMCS Code: 4459-535
Check all
exposed electrical connections for
tightness.
Check the
following devices for loose mounting or
physical damage:
•
transfor
mers
•
fuses
•
capacitors
•
lightnin
g arrestors
Check all lead wires and electrical connections for
proper cl
earance.