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GROUP 7
COOLING SYSTEM
CONTENTS
Page
DESCRIPTION
.........................
1
SERVICE DIAGNOSIS
. . . . . . . . . . . . . . . . . . .
1
SERVICE PROCEDURES
. . . . . . . . . . . . . . . . . .
3
Description
In order to provide satisfactory protection for the
wide variety of corporation models the cooling system
of each must be tailored to specific needs. To do
this effectively the Corporation offers three basic sys-
tems:
1. Standard
2 . Air Conditioning
3. High Capacity
The standard system consists of a tube and spacer
type radiator, 14 psi radiator pressure cap, centrifugal
water pump, 180°F. thermostat, and a four, six or
seven blade fan (Fig. 1 ) . See specifications for appli-
cation.
The cooling system for air conditioned vehicles gen-
erally requires a greater capacity radiator along with
a fan shroud, 16 psi radiator pressure cap, special
centrifugal water pump, larger fan, and thermostat-
ically controlled fan drive (in some installations). See
SPECIFICATIONS AND
TIGHTENING REFERENCE
. .
In Rear of Manual
specifications for applications.
The high capacity system, available as optional
equipment to the standard vehicle, is a combination
of the standard and air conditioning systems as neces-
sary to provide protection against overheating for un-
usually severe operation requirements.
For internal cooling system protection each cooling
system is factory equipped with sufficient perma-
nent type anti-freeze for -20°F.
protection. It i s
recommended that the coolant be changed annually
to insure adequate anti-freeze and corrosion protec-
tion. In areas where anti-freeze is not required,
MO-
PAR rust inhibitor must be added to the water cool-
ant for normal corrosion protection. Air conditioned
vehicles require year round protection with perma-
nent type anti-freeze with a minimum of +15"F.
protection for summer operation and additional anti-
freeze in the winter according to the prevailing tem-
peratures.
Condition
SERVICE DIAGNOSIS
Possible
Cause
Correction
EXTERNAL LEAKAGE
(a)
Loose hose clamp.
(b) Hose Leaking.
(c) Leaking radiator.
(d) Worn or damaged water pump seal.
(e) Loose core hole plug.
(f) Damaged gasket, or dry gasket, if engine has
(9) Cylinder head bolts loose, or tightened un-
(h) Leak at heater connection.
been stored.
evenly.
(i) Leak at water temperature sending unit.
(i)
Leak at water pump attaching bolt.
(k) Leak at exhaust manifold stud.
(I)
Cracked thermostat housing.
(m) Dented radiator inlet or outlet tube.
(n) Leaking heater core.
( 0 )
Cracked or porous water pump housing.
(p) Warped or cracked cylinder head.
(4) Cracked cylinder block.
(r) Sand holes or porous condition in block or
head.
Replace the hose clamp.
Replace the hose.
Repair or replace the radiator
as
necessary.
Replace the water pump seal.
Install new core hole plug.
Replace gaskets as necessary.
Replace the cylinder head gasket and torque
head in correct sequence.
Clean the heater connections and replace
the
hoses and clamps if necessary.
Tighten the water temperature sending unit.
Tighten the water pump attaching bolts
30
foot-pounds torque.
Seal and re-drive the stud.
Replace the thermostat housing.
(m) Straighten the radiator inlet or outlet tube
as
(n) Repair or replace the heater core.
( 0 )
Replace the water pump assembly.
(p) Replace the cylinder head.
(4) Replace the cylinder block.
( 4 Replace the cylinder block or cylinder head
necessary.
as necessary.
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