Coolant Temperature Regulator - Replace - Perkins 403F-E17T 404F-E22T Operation And Maintenance Manual

86
Maintenance Section

Coolant Temperature Regulator - Replace

• The coolant level (C) is for factory installed
radiator with the four cylinder turbocharged
aftercooled engine.
Note: The coolant level (B) for the four cylinder
turbocharged engine is different form three cylinder
and the four cylinder turbocharged aftercooled
engines. The four cylinder turbocharged engine
coolant level (B) is 20 mm (0.78740 inch) below the
top of the radiator neck.
Radiator Cap
Illustration 49
Typical example
Clean the cooling system filler cap and check the
condition of the filler cap gasket (1). Replace the
cooling system filler cap if the filler cap gasket (2) or
the sealing surface (1) are damaged.
The radiator filler cap should be check at regular
intervals to insure that the filler cap relieve pressure
is correct. The cooling system fill cap pressure is:
• Cooling system filler cap pressure for three
cylinder engine 95 kPa (13.7 psi)
• Cooling system filler cap pressure for four cylinder
engine 110 kPa (15.9 psi)
Reinstall the cooling system filler cap when all
checks are complete.
Coolant Temperature
Regulator - 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.
Failure to replace your water temperature regulator
on a regularly scheduled basis could cause severe
g06165279
engine damage.
Perkins 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 tempera-
ture regulator is installed in the original position. En-
sure that the water temperature regulator vent hole is
open.
Do not use liquid gasket material on the gasket or cyl-
inder head surface.
Refer to the Disassembly and Assembly Manual,
"Water Temperature Regulator - Remove and Install"
for the replacement procedure of the water
temperature regulator, or consult your Perkins dealer
or 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.
SEBU9075-03
i06296588
NOTICE