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Maintenance Section
Cooling System Water Temperature Regulator - Replace
i00912898
Cooling System Water
Temperature Regulator -
Replace
SMCS Code: 1355-510
Replace the water temperature regulator before
the water temperature regulator fails. This is a
recommended preventive maintenance practice.
Replacing the water temperature regulator reduces
the chances for unscheduled downtime.
A water temperature regulator that fails in a
partially opened position can cause overheating or
overcooling of the engine.
A water temperature regulator that fails in the
closed position can cause excessive overheating.
Excessive overheating could result in cracking of
the cylinder head or piston seizure problems.
A water temperature regulator that fails in the open
position will cause the engine operating temperature
to be too low during partial load operation. Low
engine operating temperatures during partial loads
could cause an excessive carbon buildup inside
the cylinders. This excessive carbon buildup could
result in an accelerated wear of the piston rings and
wear of the cylinder liner.
NOTICE
Failure to replace 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
temperature 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 temperature regulator vent hole is open.
Do not use liquid gasket material on the gasket or
cylinder head surface.
Refer to the Service Manual for the replacement
procedure of the water temperature regulator, or
consult your Caterpillar dealer.
Note: If only the water temperature regulators are
replaced, drain the coolant from the cooling system
to a level that is below the water temperature
regulator housing.
i01008141
Engine Air Cleaner Element -
Clean/Replace
SMCS Code: 1054-070; 1054-510
If your air cleaner element becomes plugged, the air
can split the element filter material. Unfiltered air will
drastically accelerate internal engine wear. Contact
your Caterpillar dealer for the correct filter element.
Note: The engine will be equipped with either an
AIRSEP
®
air cleaner or a single element air cleaner.
AIRSEP
®
air cleaner elements may be cleaned. The
single element air cleaner must be replaced.
AIRSEP
®
Air Cleaner Element
NOTICE
Never run the engine without an air cleaner element
installed. Never run the engine with a damaged air
cleaner element. Do not use air cleaner elements with
damaged pleats, gaskets or seals. Dirt entering the
engine causes premature wear and damage to engine
components. Air cleaner elements help to prevent air-
borne debris from entering the air inlet.
NOTICE
Never service the air cleaner element with the engine
running since this will allow dirt to enter the engine.
g00517117
Illustration 22
(1) Vacuum regulator element
(2) Air cleaner element
Note: Use the 102-9720 Cleaning Kit. This
product contains the detergent and oil that is made
specifically for the maintenance of the AIRSEP
®
elements.
1. Remove the vacuum limiter element and the
AIRSEP
®
element.
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