SEBU8603-01 87
Maintenance Section
Cooling System Water Temperature Regulator - Replace
Add the SCA, If Necessary
NOTICE
Do not exceed the recommended amount of sup-
plemental coolant additive concentration. Excessive
supplemental coolant additive concentration can form
deposits on the higher temperature surfaces of the
cooling system, reducing the engine's heat transfer
characteristics. Reduced heat transfer could cause
cracking of the cylinder head and other high temper-
ature components. Excessive supplemental coolant
additive concentration could also result in radiator
tube blockage, overheating, and/or accelerated water
pump seal wear. Never use both liquid supplemental
coolant additive and the spin-on element (if equipped)
at the same time. The use of those additives together
could result in supplemental coolant additive concen-
tration exceeding the recommended maximum.
Pressurized System: Hot coolant can cause seri-
ous burns. To open the cooling system filler cap,
stop th
e engine and wait until the cooling system
components are cool. Loosen the cooling system
pressure c ap slowly in order to relieve the pres-
sure.
NOTICE
When any servicing or repair of the engine cooling
system is performed the procedure must be performed
with the engine on level ground. This will allow you to
accurately check the coolant level. This will also help
in avoiding the risk of introducing an air lock into the
coolant system.
1. Slowly loosen the cooling system filler cap in
order to relieve the pressure. Remove the cooling
system filler cap.
Note: Always discard drained fluids according to
local regulations.
2. If necessary, drain some coolant from the cooling
system into a suitable container in order to allow
spacefortheextraSCA.
3. Add the correct amount of SCA. Refer to the
Operation and Maintenance Manual, “Refill
Capacities and Recommendations” for more
information on SCA requirements.
4. Clean the cooli
ng system filler cap and inspect the
gasket. If the gasket is damaged, discard the old
filler cap and install a new filler cap. If the gasket
is not damaged
, use a suitable pressurizing pump
in order to pressure test the filler cap. The correct
pressure is stamped on the face of the filler cap. If
the filler cap
does not retain the correct pressure,
install a new filler cap.
i04020355
Cooling Sy
stem Water
Temperature Regulato r -
Replace
Replace t
he water temperature regulator before
the water temperature regulator fails. This is a
recommended preventive maintenance practice.
Replaci
ng the water temperature regulator reduces
the chances for unscheduled downtime. Refer to this
Operation and Maintenance Manual, “Maintenance
Interva
l Schedule” for the proper maintenance
interval.
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
overh
eating could result in cracking of the cylinder
head or piston seizure problems.
Awate
r temperature regulator that fails in the open
position will cause the engine operating temperature
to be too low during partial load operation. Low
engi
ne 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.
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