'Jeep*
UNIVERSAL
SERIES
SERVICE
MANUAL
FIG.
G-8—TEMPERATURE SENDING UNIT- HURRICANE
F4
ENGINE
1—Temperature
Sending Unit
b.
Dauntless V-6 Engine.
The
thermo-couple coolant sending unit is mounted
in
the left
rear
area of the intake manifold and is
connected by a single wire to the dash unit of
the instrument cluster.
G-ll.
WATER PUMP
a.
Hurricane
F4 Engine.
The
water pump on the
Hurricane
F4
engine
is a
centrifugal
impeller type of large capacity to
cir
culate water in the entire cooling system. The double row
ball
bearing (Fig. G-9), is integral with
the shaft and is packed at assembly with a special
high melting point grease which
will
last the life of
the bearing. The bearing is sealed to retain the
lubricant
and prevent
dirt
and dust from entering.
The
bearing and shaft are retained in the water
pump body by the bearing retaining wire. The
water
seal bears against the ground seat on the
pump body and the inside of the impeller, maintain
ing a constant pressure against both and preventing
water
leakage. A
drain
hole
in the
bottom
of the
pump body precludes any water
seepage
past the
seal
from entering the bearing.
The
impeller and the pulley hub are pressed on
the shaft under high pressure,
b.
Dauntless V-6 Engine.
A
centrifugal-type water pump, shown in
Fig.
G-10,
circulates
coolant through the Dauntless V-6
engine
and
its cooling system.
This
pump is mounted on
the timing chain cover.
Similar
to the
engine
cooling
fan
mounted on its hub, the pump is driven through
a
V-belt from the crankshaft pulley.
Coolant
enters the water pump at its center.
Centri
fugal force then forces coolant radially outward, through vanes of the pump impeller, and backward
through two discharge passages in the timing chain cover. These passages conduct an equal amount of
coolant to each cylinder bank water jacket.
This
water
pump has a sealed double row
ball
bearing
and
a ceramic water seal, neither of which can be
serviced.
In
event
of bearing or water seal failure, the entire water pump assembly must be replaced.
G-l2.
Water
Pump Inspection
Check
the water pump for leaks, and excessive end play or
looseness
of the shaft in the pump. A
quick
way to check is to work the fan blades up
and
down by hand. If any play is noticed, this
indicates that the bearings are rough. Rough bearings should be checked to see if the water pump
should be replaced or rebuilt.
G-13.
Water Pump
Disassembly
—
Hurricane
F4
Engine
•
Refer to Fig. G-9.
a.
Remove the fan belt, fan blades, and fan pulley.
b.
Remove the
bolts
attaching the water pump
to the block. Remove the pump.
c.
Remove the bearing retainer spring.
d.
Remove the pump impeller and pulley with a suitable puller.
e.
Remove the pump seal, bearing and shaft, and
bearing
slinger.
G-l4.
Water Pump Reassembly
—
Hurricane
F4
Engine
•
Refer to Fig. G-9.
Before assembling the water pump, examine water
seal
seat in the pump body and should it be rough,
install
a new pump body.
To
reassemble the unit, insert the long end of the shaft into the pump body from the front end until
the outer end of the bearing is flush against the
FIG.
G-9—WATER
PUMP-
HURRICANE
F4
ENGINE
1—
Fan
and Pump Pulley
2—
Bearing
and Shaft
3—
Bearing
Retainer Spring
A—Pipe
Plug 5—
Pump
Body
6—
Seal
Washer 7—
Pump
Seal
8—
Impeller
9—
Gasket
167
G
COOLING SYSTEM G-20.
SERVICE DIAGNOSIS
SYMPTOMS
PROBABLE REMEDY
Overheating:
Lack
of Coolant Refill radiator
Thermostat inoperative . Replace thermostat
Water
pump inoperative. Overhaul or replace
Incorrect
ignition or valve timing. Set
engine
timing
Excessive piston blowby Check pistons, rings and cylinder walls
Fan
belt
broken or badly worn Replace
belt
Radiator
clogged
Reverse flush and clean
Air
passages
in core
clogged
Clean with water and air pressure
Excessive carbon formation. Remove carbon from cylinder head(s) Muffler
clogged
or
bent
exhaust
pipe
Replace damaged part
Loss
of Cooling
Liquid:
Loose
hose
connections
Tighten
connections
Damaged
hose
Replace
hose
Leaking
water pump Overhaul or replace
Leak
in radiator Remove and repair
Leaky
cylinder head
gasket
Replace
gasket
Crack
in cylinder block. Small crack can be closed with
Radiator
or Block Sealer
G-21. COOLING SYSTEM SPECIFICATIONS
Radiator
Cap:
Relief
Pressure
Vacuum
Valve Release.
Thermostat:
Rating
Starts to Open
Fully
Open
Water
Pump:
Type.
Drive
Radiator:
Type
Cooling System Capacity: Without Heater
With
Heater..
Fan:
Number of Blades Diameter
Drive
Belt: Angle of V
Length
Width
HURRICANE
F4
7 and 15 psi. [0,5 kg-cm2 and 1,05 kg cm2]
lA to 1 psi. [0,04 a 0,07 kg-cm2]
190°F.
[87,8°C]
180°F.
[82°C]
202°F.
[94°C]
Centrifugal
V-Belt
Tube
8s Fin
11 qt. [10,4 ltr.] 12 qt. [11,5 ltr.]
15" [38 cm.]
38°
42%" [108 cm.] [1,74 cmJ
DAUNTLESS
V-6 15 psi. [1,05 kg-cm2]
1 psi. [0,07 kg-cm2]
190°F.
[87,8°C]
180°F.
[82°C]
202°F.
[94°C]
Centrifugal
V-Belt
Tube
& Fin
9 qt. [8.5 ltr.]
10 qt. [9,4 ltr.]
4
\SbA"
[39,7 cm.]
38°
43.92"
[111,5
cm.] Vg"
[0.952
cm.] G-22. ANTIFREEZE CHERT
Quarts
i
Quarts
Ethylene Glycol
U.S.
Imperial
Liters
Fahr.
Cent.
10-Quart
System
2
m
2
16°
-
8.8°
3
2V2
2%
4°
-15.5°
4
3H
-12°
-24.4°
5 4M -34°
-36.6°
6
5
5Vs
-62°
-52.2°
11-Quart
System
2 2
18° -
7.6°
3 2H
2%
8°
-13.3°
4
3%
-
6°
:
-21.10
5 4M 4M -23°
-30.5°
6
5
SVs
-47°
-43.8°
12-Quart
System
2
1 m 2 1
19° ;
- 7.2°
3
2*A
10°
!
-12.2°
4
I
3H
3M 0°
;
-17.7°
5 !
4M 4^ :
-15°
s
-26.1°
6 1 5
5%
-34°
-36.6°
170
