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ENGINE COOLING SYSTEM
Radiator Cap
A pressure–vent cap is used on the radiator. The cap
contains a pressure valve and vacuum valve. The pres-
sure valve is held against its seat by a spring of pre–de-
termined strength which protects the cooling system by
relieving the pressure if the pressure in the cooling sys-
tem rises above 0.9 kg/cm. (12.8 psi, 90 kPa). The vac-
uum valve is held against its seat by a light spring which
permits opening of the valve to relieve vacuum created
in the system when it cools off and which otherwise
might cause the radiator to collapse.
The cap has its face marked 0.9, which means that its
pressure valve opens at 0.9 kg/cm. (12.8 psi, 90 kPa).
NOTE:
Do not remove radiator cap to check engine coolant
level; check coolant visually with the see through
coolant reservoir/overflow tank.
Coolant should be added only to reservoir tank as
necessary.
WARNING
!
As long as there is pressure in the cooling sys-
tem, the temperature can be considerably higher
that the boiling temperature of the solution in
the radiator without causing the solution to boil.
Removal of the radiator cap while the engine is
hot and pressure is high will cause the solution
to boil instantaneously and possibly with explo-
sive force, spewing the solution over engine,
vehicle and person removing cap.
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