60 SEBU8337
Maintenance Section
Cooling System Coolant Level - Check
i01197583
Cooling System Coolant Level
- Check
Check the coolant level when the engine is stopped
and cool.
g00285520
Illustration 23
Cooling system filler cap
Pressurized System: Hot coolant can cause seri-
ous burns. To open the cooling system filler cap,
stop the eng
ine and wait until the cooling system
components are cool. Loosen the cooling system
pressure cap slowly in order to relieve the pres-
sure.
1. Remove the cooling system filler cap slowly in
order to re
lieve pressure.
2. Maintain the coolant level within 13 mm (0.5 inch)
of the bott
om of the filler pipe. If the engine is
equipped with a sight glass, maintain the coolant
level to the proper level in the sight glass.
g00103639
Illustration 24
Typical filler cap gaskets
3. Clean the cooli
ng system filler cap and check the
condition of the filler cap gaskets. Replace the
cooling system filler cap if the filler cap gaskets are
damaged. Rein
stall the cooling system filler cap.
4. Inspect the cooling system for leaks.
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Cooling System Water
Temperatu re Regu lato r -
Replace
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.
Refer to Disassembly and Assembly, “Water
Temperature Regulator Housing - Remove and
Install” for the replacement procedure of the water
temperature regulator, or consult your Perkins
distributor.
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.
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