Check all radiator hoses and clamps.
Replace cracked and deteriorated hoses
Use extreme care when removing
a n d damaged clamps.
the coolant pressure control cap.
Remove the cap slowly after the
e n g i n e has cooled. The sudden re-
Install Radiator
lease of pressure from a heated
c o o l i n g system can result in loss of
Assemble the radiator, grill and shroud.
c o o l a n t and possible personal inju-
Then mount the assembly on the engine
r y (scaling) from the hot liquid.
base by reversing the procedure given
for removal.
Check the clearance between the tips of
the fan blades and radiator shroud after
the radiator is in place. There must be
sufficient clearance between these parts
or damage to the fan and shroud will re-
sult when the engine is started. Use
shims between the radiator and base, if
necessary
to
obtain
the
proper
clearance.
Figure 11F-13. Pressure Control Cap
(Vacuum Valve Open)
COOLANT PRESSURE CONTROL CAP
To ensure against possible damage to the
cooling system from either excessive
Description
pressure or vacuum, check both valves
periodically for proper opening and clos-
ing pressures. If the pressure valve
does not open between 6.25 psi (43.1
kPa) and 7.5 psi (51.7 kPa) or the vacu-
um valve does not open at .625 psi (4.3
kPa) (differential pressure), replace the
pressure control cap.
ENGINE COOLING FAN
Figure 11F-12. Pressure Control Cap
( P r e s s u r e Valve Open)
Description
The radiator has a pressure control cap
The engine cooling fan is belt driven
with a normally closed valve. The cap,
crankshaft
pulley
from
the
with a number 7 stamped on its top, is
designed to permit a pressure of approx-
imately seven pounds in the system be-
The fan is bolted to a hub and pulley
fore the valves opens. This pressure
which is carried on two bearings. The
raises the boiling point of the cooling li-
bracket and shaft is mounted on the fan
quid and permits somewhat higher engine
support which is in turn attached to the
operating temperatures without loss of
balance weight cover. The bracket is
any coolant from boiling. To prevent the
slotted to permit adjustment of the fan
collapse of hoses and other parts which
belt tension by moving the bracket and
are not internally supported, a second
shaft on the attaching bolts (see
valve in the cap opens under vacuum
Figure 11F-15 on page 11F-16).
when the system cools.
