Chevrolet 70 1969 Series, Shop Manual

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ENGINE C O O L IN G SYSTEM 6K-12
FAN DRIVE HUB ASSEMBLY
(TILT CAB MODELS)
G A S O L IN E ENGINES
Gasoline engines in tilt cab models employ
the type of fan drive shown in Figure 11. The
pulley hub on these engines is also used as a
vibration damper. The pulley hub is secured to
front of engine crankshaft by a single bolt. Fan
hub assembly is fastened to pulley hub by six
equally spaced bolts. Fan blade assembly is
mounted on front of fan hub assembly and secured
by six special bolts.
Fan Drive Hub Removal
(Refer to Fig. 11)
1. Remove six bolts attaching fan blade as­
sembly to fan hub and remove fan blade assembly.
2. Remove six bolts which secure fan hub to
pulley hub and remove fan hub. Remove pulleys if
desired.
Fan Drive Hub Installation
1. Position pulleys (if removed) on pulley hub.
2. Install fan hub and retain with six bolts.
Tighten bolts to 15 to 20 foot-pounds torque.
3. Install fan blade and secure with six special
bolts. Tighten bolts evenly to 20 to 25 foot-pounds.
SPECIFICATIONS
The cooling system capacities listed in "Anti-Freeze Chart" and
"Model Capacity Chart" below apply to vehicles with standard equip­
ment only. Because of some optional equipment whicy may be used, such
as engine oil cooler, air conditioning, larger engine, water filter, in­
creased cooling, etc., the capacity of cooling system will vary. For the
purpose of obtaining an accurate cooling system capacity before adding
anti-freeze to an optional equipped vehicle, it is recommended that the
cooling system be first replenished until visible in filler opening and
then drained into a graduated container of which the contents can be
measured.
Refer to "Anti-Freeze Solutions” under "Cold Weather Operation"
in this section.
C O O L IN G S Y S T E M C A P A C IT IE S (QTS.) U.S. Q U A R T S O F P E R M A N E N T
IN C L U D IN G H E A T E R (E T H Y L E N E G L Y C O L ) A N T I- F R E E Z E
R E Q U IR E D A T IN D IC A T E D T E M P E R A T U R E
Quarts
Temperature °F) 0 -10 -20
-30
Truck Series U.S. Imperial
Capacity (Qts.)
H V , JV70, JM 80 . . . . 38 32 3 4 ...................... ... .
11.5 13 15 16
T M 8 0 ............................. 44
37 3 5 ............................. 12 13.5 15.5 16.5
H M 8 0 ............................ 35 29 1/2 4 2 .............................
14 16 18.5 20
JM 80 ............................. 34
28 1/2 4 4 ............................. 15.0 17.0 19.0 21.0
EN G IN E T H E R M O S T A T S
Mean
Engine Number Temp. Starts to Fully
Used (°F) Open (°F) Open (°F)
V6 Gasoline......................................................................... ... 2 180 177-183 202
6V-53 D i e s e l ......................................................................... 2 175 174-176 190
EN G IN E O V E R H E A T SW IT C H
Switch Contacts Close at:
Gasoline E n g i n e s ................................ 225°F
Diesel Engines ................................... 215°F
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L