Chevrolet 10 1971 Series User manual

1971
SERIES 10 through 30
CHEVROLET TRUCK
CHASSIS
SERVICE MANUAL
FOREWORD
This manual includes procedures for maintenance and
adjustments, minor service operations, and removal and
installation for components of Chevrolet Series 10 through
30 Trucks. rocedures involving disassembly and assem
bly of major components for these vehicles are contained
in the 1971 Chevrolet assenger Car and Series 10-30
Truck Overhaul Manual.
The Section Index on this page enables the user to
quickly locate any desired section. At the beginning of
each section containing more than one major subject is a
Table of Contents, which gives the page number on which
each major subject begins. An Index is placed at the
beginning of each major subject within the section.
Summaries of Special Tools, when required, are found
at the end of major sections while specifications covering
vehicle components are presented at the rear of the
manual.
This manual should be kept in a handy place for ready
reference. If properly used, it will enable the technician
to better serve the owners of Chevrolet built vehicles.
All information, illustrations and specifications con
tained in this literature are based on the latest product
information available at the time of publication approval.
The right is reserved to make changes at any time without
notice.
• • •
CHEVROLET MOTOR DIVISION
General Motors Corporation
DETROIT, MICHIGAN *
S E C T IO N IN D E X
SECTION NAME
0
GENERAL INFORMATION
AND LUBRICATION
1A
HEATER AND
AIR CONDITIONING
IB
BODY
2
FRAME
3
FRONT SUSPENSION
4-WHEEL DRIVE
4
REAR SUSPENSION
AND DRIVELINE
5
BRAKES
6
ENGINE
6K
ENGINE COOLING
6M
FUEL SYSTEM
6T
EMISSION CONTROL
SYSTEMS
6Y
ENGINE ELECTRICAL
7
CLUTCH AND TRANSMISSION
•%
8
FUEL TANK AND
EXHAUST SYSTEM
9
STEERING
10
WHEELS AND TIRES
11
CHASSIS SHEET METAL
12
ELECTRICAL— BODY
AND CHASSIS
13
RADIATOR AND GRILLE
14
BUMPERS
15
ACCESSORIES
SPECIFICATIONS
© 1970 Genera Motors Corporation Printed in U.S.A.

SECTION 0
GENERAL INFORMATION
AND LUBRICATION
GENERAL INFORMATION
INDEX
Page
Model Line Up ................ .. .................................................................... ........ 0-1
Truck Series and Model Identification ................................................ ........ 0-1
Ve icle Identification Number and
Rating Plate.............................................................. ............................... ........ 0-1
Engine N um ber............................................................................ .. .................0-1
Unit and Serial Number Locations ....................... ........... .. . . ................... 0-2
Page
Service Parts Identification Plate ......................................................... ....... 0-2
Keys and Locks . . . . ................................................................................ ....... 0-3
Pus ing to Start Ve icle ....................................................................... ....... 0-3
Towing ..................................................................................................... ....... 0-3
Engine Ve icle Availability............................................ ...................... ....... 0-4
Load Capacity C art . . ................................ ........................................... ....... 0-5
MODEL LINE UP
The 10 through 30 Series Conventional 2- and 4-Wheel
drive and forward control truck model line-up for 1971
consists of the models shown in the "Engine-Vehicle”
Availability Chart in this section.
TRUCK SERIES AND MODEL IDENTIFICATION
A five digit number preceded by two letters is used to
identify truck series and models. For example, vehicle
CS 10704 would be: Conventional
gine [S], 3600#-5600# GVW [T],
dimension j07j , Stepside pickup [04j
First Letter—Chassis
C], L-6 gasoline en-
42"-47" Cab-to-Axle
as listed below.
[Cl - Conventional (Conventional Cab, Suburban)
K - Four-Wheel Drive
- Forward Control
Second Letter— Engine
A - All
E - V-8 Gasoline
[s] - L-6 Gasoline
First Number— GVW Range
0 - All
[1] - 3900-5800#
2 - 5200-7500#
3 - 6600-14000#
Second and Third Numbers-
Cab-To-Ax e Dimension
Fourth and Fifth Numbers—
Body Sty es
00 - All
02 - Flat Face Cowl
03 - Cab
m - Stepside ickup
06 - Suburban ( anel Rear Doors)
14 - Utility (Blazer)
16 - Suburban (Tail - Liftgate)
32 - Motor Home Chassis
34 - Fleetside ickup
35 - Forward Control (Steel Step-Van King)
42 - Forward Control Chassis
55 - Forward Control (Aluminum Step-Van King)
VEHICLE IDENTIFICATION NUMBER AND
RATING PLATE
A combination vehicle identification number and rating
plate used on all models (fig. 1) is located on the door
pillar, except on School Bus, Flat Face Cowl, and some
Forward Control models (motor home). On School Bus
and Flat Face Cowl models the plate is attached to the
air intake plenum panel. On Forward Control models
( 10, 20, 30 except 30 Motor Home Chassis) it is
attached to the dash and toe panel.
A typical vehicle identification number will decode
as follows: (See Series and Model Identification).
CS14F600025
CS14 Series and model identification, with
out second, third and fourth numbers.
Last number of model year 1971.
00 - All
05 - 30-35 F Assembly plant, F = Flint.
- 42-47”
08 - 48-53" 600025 Twenty fifth vehicle built at that plant.
09 - 54-59" Unit numbering starts at 600001 at all
10 - 60-65" plants.
10-30 CHEVROLET TRUCK SERVICE MANUAL

GENERAL INFORMATION 0-2
oGENERAL MOTORS CORPORATION o
WARRANTY MAY BE VOIDED IF WEIGHT
EXCEEDS ANY OF THE RATINGS SHOWN.
GROSS VEHICLE WEIGHT INCLUDES WEIGHT OF
BASE TRUCK, ALL ADDED EQUIPMENT, DRIVER
AND PASSENGERS, AND ALL PROPERTY LOADED
INTO TRUCK.
*REFER TO OWNER’S MANUAL FOR/EQUIP
MENT REQUIRED FOR INTERMEDIATE OR
MAXIMUM GVW RATINGS, AND FOR OTHER
LOADING INFORMATION, INCLUDING TIRE
INFLATION. RATING IN POUNDS
AS MANU- * MAXIMUM
FACTURED CAPABILITY
GROSS VEHICLE WEIGHT
FOR THIS VEHICLE
MAXIMUM FRONT END
WEIGHT AT GROUND
MAXIMUM REAR END
WEIGHT AT GROUND
VEHICLE IDENTIFICATION NO.
Oo
Fig. 1— Vehic e Identification Number and Rating
P ate Information
ENGINE NUMBER
The engine number indicates manufacturing plant,
month and day of manufacture, and transmission type. A
typical engine number would be F1210TFA, which would
breakdown thus:
F - Manufacturing lant (F-Flint, T-Tonawanda)
12 - Month of manufacture (December)
10 - Day of manufacture (tenth)
T - Truck
FA - Transmission and engine type
UNIT AND SERIAL NUMBER LOCATIONS
For the convenience of service technicians and engi
neers when writing up certain business papers such as
Warranty Reports, roduct Information Reports, or re
porting product failures in any way, the location of the
various unit numbers have been indicated. These unit
numbers and their prefix or suffix are necessary on these
papers for various reasons - such as accounting, follow-
up on production, etc.
The prefixes on certain units identify the plant in
which the unit was manufactured and thereby permits
proper follow-up of the plant involved to get corrections
made when necessary.
Always include the prefix in the number.
Ax es
• Series 10 Rear Axle Serial Number Located at the
Bottom Flange of Carrier Housing,
• Series 20-30 Rear Axle Located at the Forward
Upper Surface of Carrier.
Transmissions
• 3-Speed Transmission Unit Number Located on
Lower Left Side of Case Adjacent to Rear of Cover.
• 4-Speed Transmission Unit Number Stamped on
Rear of Case, Above Output.
• owerglide and Turbo Hydra-Matic 350 Transmis
sion Unit Number Located on Right Rear Vertical
Surface of Oil an.
• The Turbo Hydra-Matic Transmission 400 Serial
Number is Located on the Light Blue late on the
Right Side of the Transmission.
Engines
• 6-Cylinder Engine Unit Number Located on ad at
Right Hand Side of Cylinder Block at Rear of
Distributor.
• 8-Cylinder Engine Unit Number Located on ad at
Front, Right Hand Side of Cylinder Block.
De cotrons
Delcotron Unit Serial Number--Top of Rear Housing.
Batteries
Battery Code Number Located on Cell Cover Top of
Battery.
Starters
Starter Serial Number and roduction Date Stamped
on Outer Case, Toward Rear.
SERVICE PARTS IDENTIFICATION PLATE
The Chevrolet Truck Service arts Identification late
(fig. 2) is provided on all Truck models. On most series
it will be located on the inside of the glove box door, or,
on Forward Control series, it will be located on an inner
body panel. The plate lists the vehicle serial number,
wheelbase, and all roduction options or Special Equip
ment on the vehicle when it was shipped from the factory
including paint information. ALWAYS REFER TO THIS
INFORMATION WHEN ORDERING ARTS,
SERVICE PARTS IDENTIFICATION
W/ ASE |
V.I.N.—VEHICLE IDENTIFICATION NUMBER
N O TE : THE S ECIAL EQUI MENT LISTED B ELOW HAS BEEN INSTALLED ON
TH IS V EH IC L E. F O R RO E R IDEN TIFIC AT ION OF R E L A CE M ENT
ARTS BE SURE TO S ECIFY THE A LICABLE O TION NUMBERS.
IMPORTANT: RETAIN THIS PLATE AS A PERMANENT RECORD
Fig. 2— Service Parts Identification P ate
10-30 CHEVROLET TRUCK SERVICE MANUAL

GENERAL INFORMATION 0-3
KEYS AND LOCKS
Two keys are provided with each vehicle. The keys
operate the ignition switch and door locks.
PUSHING, TO START VEHICLE
NOTE: Towing to start is not recommended due
to the possibility of the disabled truck accelerat
ing into the towed vehicle.
Push Starts— Trucks Equipped with
Manua Transmission
When a push start is necessary turn off all electrical
loads such as heater, radio and, if possible, lights, turn
on key, depress the clutch, and place the shift lever in
3rd gear. Release the clutch when your speed reaches
10 to 15 miles per hour.
Push Starts—Trucks Equipped with
Automatic Transmission
Do not attempt to start the engine by pushing the truck.
Should the battery become discharged, it will be neces
sary to use an auxiliary battery with jumper cables to
start the engine.
CAUTION: To prevent damage to electrical
system never connect booster batteries in ex
cess of 12 volts and connect positive to positive
and negative to negative.
TOWING
A Except Four Whee Drive Trucks
Normally your vehicle may be towed with all four
wheels on the ground for distances up to 50 miles at
speeds of less than 35 M H. The engine should be off
and the transmission in neutral.
However, the rear wheels must be raised off the ground
or the drive shaft disconnected when the transmission is
not operating properly or when a speed of 35 M H or dis
tance of 50 miles will be exceeded.
CAUTION: If a truck is towed on its front
wheels only, the steering wheel must be secured
with the wheels in a straight ahead position.
Four Whee Drive Trucks
It is recommended that the truck be towed with the
front wheels off the ground. The truck can be towed,
however, with the rear wheels off the ground if there is
damage in the rear wheel area. In this event, the trans
mission selector lever should be placed in the “N”
(neutral) position and the front drive disengaged. Towing
speeds should not exceed 35 M H for distances up to 50
miles. If truck is towed on its front wheels, the steering
wheel should be secured to keep the front wheels in a
straight-ahead position.
When towing the vehicle at slow speeds (approx. 20
M H), for a very short distance only, the transmission
must be in NEUTRAL and the transfer case MUST be in
“TWO WHEEL HIGH.”
When towing the vehicle at faster speeds for greater
distances, the following steps MUST be taken:
• If front wheels are on the road, disconnect the front
drive shaft.
• If rear wheels are on the road, disconnect the rear
drive shaft.
Both 3 and 4 speed transmissions should be towed in
neutral only, with parking brakes fully released.
When towing a vehicle on its front wheels only, the
steering wheel should be secured to maintain a straight
forward position.
ENGINE—VEHICLE AVAILABILITY
See chart on following page.
LOAD CAPACITY CHART
New spring capacities and mandatory equipment options
are included in the Load capacity chart on the following
pages.
10-30 CHEVROLET TRUCK SERVICE MANUAL

ENGINE-VEHICLE AVAILABILITY
Body Base Engine W.B. Series 10 Series 20 Series 30
Convent.
Cab
106" BBC
250 L-6 Gas 115 CS10703
127 CS10903 CS20903
133 CS31003
157 CS31403
307 V-8 Gas 115 CE10703
127 CE10903 CE20903
133 CE31003
157 CE31403
Stepside
ickup 250 L-6 Gas 115 CE 10704
127 CE 10904 CS20904
133 CS31004
307 V-8 Gas 115 CE 10704
127 CE 10904 CE20904
133 CE31004
Fleetside
ickup 250 L-6 Gas 115 CS10734
127 CS 10934 CS20934
133 CS21034 CS31034
307 V-8 Gas 115 CE 10734
127 CE 10934 CE20934
133 CE21034 CE31034
Suburban
Carryall 250 L-6 Gas 127 CS10906 CS20906 127 CS10916 CS20916
307 V-8 Gas 127 CE 10906 CE20906
127 CE 10916 CE20916
FF Cowl 250 L-6 Gas 133 CS31002
307 V-8 Gas 133 CE31002
Utility
(K/5 Blazer) 250 L-6 Gas 104 CS10514 307 V-8 Gas 104 CE 10514
Convent.
Cab
106” BBC
250 L-6 Gas 127 KS20903
307 V-8 Gas 127 KE20903
Stepside
ickup 250 L-6 Gas 115 KS10704
127 KS10904 KS20904
307 V-8 Gas 115 KE10704
127 KE10904 KE20904
Fleetside
ickup 250 L-6 Gas 115 KS10734 127 KS10934 KS20934
307 V-8 Gas 115 KE 10734
127 KE 10934 KE20934
Suburban
Carryall 250 L-6 Gas 127 KS10906 KS20906
127 KS10916 KS20916
307 V-8 Gas 127 KE 10906 KE20906
127 KE10916 KE20916
Utility
(K/5 Blazer) 250 L-6 Gas 104 KS10514
307 V-8 Gas 104 KE 10514
Body Base Engine W.B. Series 10 Series 20 Series 30
Steel Step-
Van 7 250 L-6 Gas 102 S10535
Steel Step-
Van King 250 L-6 Gas 125 S20835 S30835
133 S21035 S31035
157 S31435
307 V-8 Gas 125 E20835 E30835
133 E21035 E31035
157 E31435
Aluminum
Step-Van
King
250 L-6 Gas 125 S20855 S30855
133 S21055 S31055
157 S31455
307 V-8 Gas 125 E20855 E30855
133 E21055 E31055
157 E31455
Regular
Chassis 250 L-6 Gas 102 S10542
129 S20842 S30842
133 S21042 S31042
157 S31442
307 V-8 Gas 125 E20842 E30842
133 E21042 E31042
157 E31442
Motor
Home
Chassis
350 V-8 Gas 157 E31132
157 E31432
O TIONAL ENGINES - SERIES AVAILABILITY
292 Cu. In. L-6 Gas CIO, 20, 30 (Except Blazer)
K10, 20 (Except Blazer)
20, 30 (Except Motor Home)
350 Cu. In. V-8 Gas CIO, 20, 30
K10, 20
20, 30
402 Cu. In. V-8 Gas CIO, 20, 30 (Except Blazer)

GENERAL INFORMATION 0-5
LOAD CAPACITY CHART INTERPRETATION
The first column of the Load Capacity Chart on the
following pages shows the basic model series.
The next column reflects the wheelbases available
within each series.
The third column shows the Gross Vehicle Weight
(GVW) Ratings applicable to each series truck. GVW
means the maximum design weight of the truck including
the truck itself and all equipment added to the truck
after it has left the factory, the driver weight and occu
pant weight and everything that is loaded into or onto the
truck.
Following the GVW columns are the minimum recom
mended tires to qualify the vehicle for each GVW rating.
The tire pressures listed in the column adjacent to the
tire sizes in the chart are the minimum required tire
pressures for maximum permissible loads.
The letters “B.E.” under the Front and Rear Axle
and Spring columns indicate that base equipment is
satisfactory to qualify the vehicle for any given GVW
rating. When the letters “R O” denoting Regular ro
duction Option, followed by a number appears in these
columns (example R O G50),the vehicle must be equipped
with the extra cost equipment specified by the R O to
qualify the vehicle for the given GVW rating.
The ratings shown under the column identified ''Maxi
mum Front End Weight At Ground'', "Maximum Rear End
Weight At Ground” , indicates the maximum permissible
loading or weight at the ground regardless of spring or
axle capacity ratings. These ratings are developed on the
basis of the minimum component capability be it axles,
springs or tires.
In loading the vehicle, the combined front and rear end
weights at the ground must not exceed the GVW specified
for the vehicle as manufactured (see illustration).
In trailer hauling applications, the vehicle rear end
weight at the ground with trailer attached must not ex
ceed the "Maximum Rear End Weight at Ground" rating
of the vehicle.
Shown below is a typical example of a Truck in a
loaded condition. Note that the axle or GVW capabilities
are not exceeded.
LOADED-MAXIMUM GVW: 5000-LBS.
FRONT A XL E CAPACITY: 2700 LBS. REAR A X LE CAPACITY: 3221 LBS.
Front Curb 2010 bs.
Front Cargo
Load 200 bs.
2210 bs.
Rear Curb 1435 bs.
Rear Cargo
Load 1 355 bs.
2790 bs.
TOTAL WEIGHT AT GROUND: 5000 bs.
10-30 CHEVROLET TRUCK SERVICE MANUAL

GENERAL INFORMATION 0-6
LOAD CAPACITY CHART FOR 1971 CHEVROLET SERIES 10 THROUGH 30 TRUCKS
1971
GASOLINE
MODELS
WHEEL
BASE
GVW
(LBS.)*
MINIMUM MANDATORY EQUIPMENT FOR GVW RATING
FRONT
TIRES
FRONT
TIRE
PRES
SURE
REAR
TIRES
REAR
TIRE
PRES
SURE
FRONT
AXLE
FRONT
SPRINGS
MAXIMUM
FRONT END
WEIGHT AT
GROUND*
REAR
AXLE
REAR
SPRINGS
MAXIMUM
REAR END
WEIGHT AT
GROUND*
CS-CE10
(03, 04, 34-Models) 115 127 4400 G78-15 28 G78-15 24 .E. .E. 2700 .E. .E. 2500
5400 t H78-15 24 H78-15 32 E. .E. 2700 .E. RPO G50 3221
CS-CE10
(06, 16 Models) 127 4800 G78-15 28 G78-15 28 .E. .E. 2700 .E. .E. 2700
5400 H78-15 24 H7815 32 .E. .E. 2700 .E. RPO G50 3221
CS-CE10
(14 Models) 104 4400 E78-15 32 E78-15 32 .E. .E. 2548 .E. .E. 2500
5000 H78-15 24 H78 15 32 .E. .E. 2700 .E. RPO G50 322.1 .
CS-CE20
(exc. 21034 Models) 127 6200 8.75 16.5-6 30 8 75-16.5-6 45 E. .E. 3000 .E. .E. 3980
6700 8.75 16.5 6 30 8.75-16.5-8 60 .E. .E. 3000 .E. RPO G50 4700
7500 9.50-16.5 8 30 9.50 16.5-8 55 .E. .E. 3000 .E. RPO G50 5200
CS-CE21034 133 6200 8.75 16.5-6 30 8.75-16.5-6 45 .E. .E. 3000 .E. .E. 3980
6700 8.75 16.5 6 30 8.75 16.5 8 60 .E .E. 3000 .E. RPO G50 4700
7500 9.50 16.5 8 30 9.50 16.5 8 55 .E. .E. 3000 .E. RPO G50 5200
CS-CE30
(02, 03, 04, 34 Models)
(Single Rear Wheels)
133
157
6600 8.75 16.5-6 35 8.75-16.5 6 45 .E. .E 3300 .E .E. 3980
8000 9 50 16.5-8 30 9.50 16 .5 8 60 .E. .E. 3300 .E. RPO G50 5560
9000 9.50 16.5 8 30 9.50-16.5-10 75 .E. .E. 3300 .E. RPO G60 6340
CS-CE30
(02, 03 Models)
(Dual Rear Wheels)
133
157
6600 6.50 16-6 45 6 50-16-6 Dual 35 .E. .E. 3220 RPO R05 .E. 4800
8000 6.50 16 6 45 6.50 16 6 Dual 45 .E. .E. 3220 RPO R05 RPO G50 5680
9000 7 00 16 6 40 7.00 16 6 Dual 45 E. .E. 3300 RPO R05 RPO G60 6320
10000 7.'50 1 6 6 35 7 50-16 6 Dual 45 .E. RPO F60 3500 RPO R05 RPO G60 7260
CS-CE30
(02, 03 Models)
(Heavy Duty with Dual
Rear Wheels)
133
157
11000 7.00 18 8 55 7.00 18 8 Dual 65 RPO H22 RPO H22 4000 RPO H22 RPO H22 9080
14000 8-19.5-8 50 8 19.5-10 Dual 80 RPO H22 RPO H22 4000 RPO H22 RPO H22 11000
KS-KE10
(04, 34 Models) 115 127 5200 G7815 32 G78-15 32 .E. .E. 2900 .E .E. 2948
5600 H7815 28 H78-15 32 .E. .E. 2900 .E. .E. 3221
KS-KE10
(06, 16 Models) 127 5200 G78”1 5 32 G78-15 32 .E. .E. 2900 .E. .E. 2948 5800 H78-1 5 28 H78-15 32 .E. .E. 2900 .E. .E. 3221
KS-KE10
(14 Models) 104 4600 E 78-1 5 32 E7815 32 .E. .E. 2548 .E. .E. 2548
5000 G7815 32 G78-15 32 .E. .E. 2948 .E. .E. 2948
KS-KE20 127 6400 8.75-16.5-6 35 8.75-16.56 45 .E. .E. 3200 .E. .E. 3800
7200 8.75-16.5 6 35 8.75 16.5-8 60 .E. .E. 3200 .E. RPO G50 4700
7500 9.50-16.5 8 30 9.50 16.5-8 50 .E. .E. 3200 .E. RPO G50 5000
PS10 102 4600 G78 15 24 G78-15 24 .E. .E. 2500 .E. .E. 2500
5400 t H78-1 5 24 H78-1 5 32 .E. .E. 2500 .E. RPO G50 3221
PS-PE20 125
133 6500 8.75 16.5-6 30 8.75-16.5 6 45 .E. .E. 3000 .E. .E. 3980
7500 9.50 16.5 8 30 9.50 16.5-8 55 .E. .E. 3000 .E. RPO G50 5200
PS PE30
(Single or Dual
Rear Wheels)
125
133
157
7300 8.75-16.5-6 40 8.75 16.5-8 60 .E. .E. 3500 .E. .E. 4700
10000 7.50-16-6 35 7.50-16-6 Dual 45 .E. .E. 3500 RPO R05 RPO G60 7200
PS-PE30
(Heavy Duty with
Dual Rear Wheels)
125
133
157
11000 7.00-18 8 55 7.00 18 8 Dual 65 RPO H22 RPO H22 4000 RPO H22 RPO H22 9080
14000 8-19.5-8 50 8 19.5 10 Dual 80 RPO H22 RPO H22 4000 RPO H22 RPO H22 11000
PE31132
(Motor Home Chassis) 137 7300 8.75-16.5-6 45 8.75 16.5-8 60 .E. .E. 3980 .E. .E. 4700
10000 7.50-16-6 45 7.50-16-6 Dual 45 .E. .E. 4000 RPO R05 RPO G60 7200
PE31432
(Motor Home Chassis) 157 7300 8.75-16.5-6 45 8.75-16.5-8 60 .E. .E. 3980 .E. .E. 4700
10000 7.50-16-6 45 7.50 16-6 Dual 45 .E. .E. 4000 RPO R05 RPO G60 7200
Refer to GVW plate on vehicle. Maximum front and rear end loads on this Load Capacity
Chart are based upon component minimum capacity of axles, springs, or tires,
t RPO J70 Power rakes required
E. denotes "base equipment"
July 10, 1970
10-30 CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-7
LUBRICATION INCL. ENGINE FUEL)
AND MAINTENANCE
INDEX
Page
Engines
Engine Fuel Requirements................................................................ ...... 0-7
Engine Oil Recommendations ......................................................... ...... 0-7
Crankcase Capacities ......................................................................... ...... 0-8
Air Cleaner Care .................................................................................. ...... 0-8
Emission Control Systems ................................................................ ...... 0-9
Tune-up and Electrical System C ecks ........................................... ...... 0-9
Coolant Recommendations ............................................................. ...... 0-10
Fuel System......................................................................................... ...... 0-11
Clutc and Transmissions ..................................................................... ...... 0-11
Clutc .................................................................................................. ...... 0-11
Manual Transmission .............. .. ..................................................... . 0-11
Automatic Transmissions . .................................................................... ...... 0-12
Powerglide............................................................................................ ...... 0-12
Turbo Hydra-Matic ........................................................................... ...... 0-12
Rear Axles .............................................................................................. ...... 0-12
Positraction ......................................................................................... ...... 0-12
Propeller S aft Slip Joints ................................................................ ...... 0-12
Universal Joints .................................................................................. ...... 0-12
Brakes ................ .. .................................................................................... ...... 0-12
Page
Parking Brake....................................................................................... ...... 0-1
Hydraulic Brake System..................................................................... ...... 0-1
Power Brake Vacuum U nits.............................................................. ...... 0-13
W eels and Tires..................................................................................... ...... 0-13
W eel Nut Torques ............................................................................ ...... 0-13
W eel Bearings..................................................................................... ...... 0-13
Steering..................................................................................................... ...... 0-13
Standard Steering . ................................................................................ ...... 0-13
Power Steering..................................................................................... ...... 0-13
Suspension .............................................................................................. ...... 0-14
Steering Linkage and Front Suspension ......................................... ...... 0-14
Rear Suspension .................................................................................. ...... 0-14
Four W eel Drive ................................................................................... ...... 0-14
Front A x le............................................................................................ ...... 0-14
Air Vent Hose ..................................................................................... ...... 0-14
Transfer Case....................................................................................... ...... 0-14
Control Lever and Linkage ................................................................ ...... 0-14
Tac ometer Mec anical ......................................................................... ...... 0-14
Body Lubrication ................................................................................... ...... 0-14
Lubrication Diagrams ......................................... .................................. ...... 0-15
The time or mileage intervals for lubrication and
maintenance services outlined in this section are intended
as a guide for establishing regular maintenance and lu
brication periods. Sustained heavy duty and high speed
operation or operation under adverse conditions may
require more frequent servicing.
ENGINE FUEL REQUIREMENTS
Trucks are designed to operate efficiently on fuel of
approximately 91 Research Octane Number or higher,
commonly sold in the United States and Canada. Use of
a fuel which is too low in anti-knock quality will result
in ''spark knock” and/or “after-run”. Since the anti
knock quality of all gasolines is not the same and factors
such as altitude, terrain and air temperature affect
operating efficiency, knocking and/or “after-run" may
result even though using the fuel recommended. It may
be necessary to change to a higher grade of gasoline
and if knocking continues, further check on the condition
of the engine will be necessary.
In any case, continuous or excessive knocking may
result in engine damage and constitutes misuse of the
engine for which the Chevrolet Division is not responsible
under terms of the Manufacturer's New Vehicle
Warranty.
Operation in a Foreign Country
If it is planned to operate a truck outside the continen
tal limits of the United States or Canada, there is a
possibility that the best fuels available are so low in
anti-knock quality that excessive knocking and serious
engine damage may result from their use. To minimize
this possibility, it is suggested that customers write to
Chevrolet Motor Division, Owner Relations Department,
Detroit, Michigan 48202, giving:
1. The compression ratio of the engine.
2. The Vehicle Identification Number.
3. The country or countries in which the customer plans
to travel.
The customer will be furnished details of adjustments
or modifications which should be made to the engine by
the Chevrolet Dealer prior to departure.
Failure to make the necessary changes to the truck and
subsequent operation under conditions of continuous or
excessive knocking is considered misuse of the engine
for which the Chevrolet Motor Division is not responsible
under terms of the Manufacturer's New Vehicle
Warranty.
After arriving in a foreign country, contact should be
made at the nearest authorized General Motors Dealer
for brand names of the best fuels available and advice as
to where they may be purchased.
ENGINE OIL RECOMMENDATIONS
Use only engine oil which meets GM 6041-M standard.
High quality oils which are intended for service MS and
pass car maker's tests are of this quality. The oil
change interval (see section of "Engine Oil Change In
terval") and the new vehicle warranty are based on the
use of oils that meet these requirements.
NOTE: Non-detergent and other low quality
oils are specifically not recommended., The use
of proper engine oils and oil change intervals
are the best assurance of continued reliability
and performance.
10-30 CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-8
Supp ementa Engine Oi Additives
The regular use of supplemental additives is specifi
cally not recommended and will increase operating costs.
However, in cases of specific problems which may arise
under certain conditions, additive supplements are avail
able that can effectively and economically solve these
problems without causing other difficulties. For example,
if higher detergency is required to reduce varnish and
sludge deposits resulting from some unusual operational
difficulty, a thoroughly tested and approved concentrate—
"Engine Oil Supplement”—is available.
Checking Oi Leve
The engine oil should be maintained at proper level.
The best time to check it is before operating the engine
or as the last step in a fuel stop. This will allow the oil
accumulation in the engine to drain back in the crankcase.
To check the level, remove the oil gauge rod (dip stick),
wipe it clean and reinsert it firmly for an accurate read
ing. The oil gauge rod is marked "FULL” and "ADD
OIL”. The oil level should be maintained in the safety
margin, neither going above the "FULL” line nor below
"ADD OIL” line. Reseat the gauge firmly after taking
the reading.
NOTE: The oil gauge rod is also marked. "Use
GM 6041-M Quality MS oil” as a reminder to use
only high quality oils as prescribed under "En
gine Oil Recommendations.”
Crankcase Capacity (Does not inc ude fi ter)
292 L6 Engine; 5 quarts U.S. measure, 4.25 quarts
Imperial measure.
All other engines; 4 quarts U.S. measure, 3.25 quarts
Imperial measure.
Engine Oi Change Interva
Change oil each 4 months. If more than 6,000 miles
are driven in a 4-month period, change oil each 6,000
miles.
In the following types of service the oil change interval
should not exceed 2 months, or 3,000 miles, whichever
occurs first.
• operation under dusty conditions,
• trailer hauling or camper use,
• extensive idling,
• frequent long runs at high speeds and high ambient
temperatures,
• short trip operation at freezing temperatures (en
gine not thoroughly warmed up), or
• STO and GO type service such as delivery trucks,
etc.
The above recommendations apply to the first change
as well as subsequent oil changes. The oil change in
terval for the truck engine is based on the use of oils
that meet the requirements indicated in the section on
"Engine Oil Recommendations.” Oil change intervals
longer than those listed above will result in serious re
ductions in engine life and may affect Chevrolet's obliga
tion under the provisions of the new vehicle warranty.
A high quality MS oil meeting General Motors Standard
GM 6041-M was installed in the engine at the factory. It
is not necessary to change this factory-installed oil prior
to the recommended normal change period. However, the
oil level should be checked more frequently during the
break-in period since somewhat higher oil consumption
is normal until the piston rings become seated.
Recommended Viscosity
The following chart will serve as a guide in selecting
the proper oil viscosity. The proper viscosity helps as
sure good cold and hot starting by reducing friction and
thus increasing cranking speed.
• SAE 5W-20 oils are not recommended for sustained
high speed driving.
• SAE 30 oils may be used at temperatures above
40°F.
RECOMMENDED SAE VISCOSITY NUMBER
10W, 5W-30, 10W-30, 10W-40
w m m
-30 - 0 0 0 40 60 80 100
TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE, °F.
Fig. 3— O i Viscosity Guide
Engine Oi Fi ter Rep acement
Replace filter at first oil change and at every second
oil change thereafter. This recommendation is based on
the use of engine oils that meet the requirements indi
cated in the section on "Engine Oil Recommendations,”
and the use of the applicable A.C. oil filter or equivalent.
Oi Fi ter Type and Capacity—Throwaway type, 1 quart
U.S. measure, .75 quart Imperial measure.
AIR CLEANER CARE
CAUTION: In addition to its function of filtering
air drawn into the engine through the carburetor,
the air cleaner also acts as a flame arrestor in
the event the engine backfires. Because back
firing may cause fire in the engine compart-
ment, the air cleaner should be installed at all
times unless its removal is necessary for re-
pair or maintenance services.
NOTE: Under prolonged dusty driving condi
tions, it is recommended that these operations
be performed more often.
Paper E ement Type
First 12,000 miles, inspect element for dust leaks,
holes or other damage, replace if necessary. If satis
factory, rotate element 180° from originally installed
position. Replace element at 24,000 miles. Element
must not be washed, oiled, tapped or cleaned with an air
hose.
Oi Wetted Paper E ement Type
The oil wetted paper element is a long-life efficient
air cleaner and should not require replacement before
24,000 miles except under extremely dusty conditions.
10-30 CHEVROLET TRUCK SERVICE MANUAL