Chevrolet 1979 Light Duty Truck User manual

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IOrl9S2

OPERATOR'S MANUAL
Fo r 19 52
Chevrolet Light, Medium and
Heavy Duty Trucks
SECOND EDITION
INTRODUCTION
Thi s operator's and owner's
manua l has been prepared to fur-
nish information pertaining to the
driving, ca re and mainte n ance of
Chevro l et truck s as well as to pro-
vide te chni cal data th at may be of
value or interest to truck owners.
The subject index at the right
is a r eady r eference to the key
s ub jects and will assist in fi nd ing
any subject cover ed in the b oo klet.
Chevrolet Motor Division
General Mot ors Cor porati on
Detr o it 2, Michigan
SUBJ E CT INDEX
Driv e r' s Ope ra tine
Inform ation Page
Bre a ki ng· in P eriad . ..... 3
Co n trols and Jnstrumen ls .. •. 4
Prestarling l nspection . 14
SlarlingllleEn'ine ...... .... 14
Gearshitting .... ... ... .... 15
Cold Wealller Operation ..... 17
tkllWeather Operation. 19
Tirelnflati on ........... . .. 19
Description, Ca re a nd
Maint enance
Pr evenliveMaintenance . 21
E ngi~e ...................... 22
Cooling System . 34
Cl u tch. . ......... ..... 40
T ransm is sion . 41
Rear Axle ..... .. .. . ..... 43
F rontAxle ... .. ... 45
~~ ~ r ~ n~y~te:~ .............. ... : ~
SpringsandSh ackles .. ... .. 56
El ectrica l Syslem . 57
Tires .. . ..... ........ 63
Lubr ication
E ngine _ .... .... .. . .... ..... 70
R ea r Ax le and Tr ansmis si on .. 77
Universal J oint .. ......... __ 78
Fro nt Wh e el Bea ri ngs .. .... ~ 80
R ear W heel Bearings.. 81
C hassi s .. 81
Hints (or Loca tin,
Road Troubl es
~~~rse_ ............ :::::::::::: :: ~
Genera l .... . ... . ........ 95
G en er al Inf o rmation
Manufaclurer'sWarranly .. .. . 96
TireWarranty . ... ..... __ _ .. 97
Owner's Serv ic e P olicy ....... 104
Tec hnical Data
Un i tCapaci lyChart. ... _. __ .98
lamp Bulb Char t ..... .... .. 99
Sp ec ifi cations ............ ... 99
Adjustment Specifica t ion s tOO
loadCapacilyChart . .... 102·103

F ig. I-Co"'1OI, ond l"st,um."Is_'j, o"d % To"

CHAPTER I
DRIVER 'S OPERATING INFORMATION
BREAKING-IN PERIOD
The crankcase of the engine in this vehicle, as rec eived,
is filled with a light body "breaking -in" oil. Use this oil
only during the breaking-in schedule shown below. It shou ld
not be used after completion of the breaking-in schedule.
Check the oil frequently during the first 500 miles and at
the end of 500 miles, drain the crankcase-while hot-and refill
using the grade of oil recommended in Lubrication section.
To properly break-in th e moving parts of the engine do not
drive faster than:
35
miles per hour for the first 100 miles
45 miles per hour for the next 200 miles
50 miles per hour for the next 200 miles
f ig. 2_Co,"I.o1o ond ''''',,,,,,.,,h-' 'h e .... ., 2 To ..
-3'

CONTROLS AND INSTRUMENTS
The type, location and operation of instruments and con-
trols vary on different models and makes of vehicles; therefore,
regardless of the experience an owner or driver may have had
it is advisable to familiarize one's self with the instruments
and controls, and their use before driving this new truck. The
locations of the various instruments and controls are shown in
figures 1 and 2.
Instrument Group
Gasoline Gauge. The electrically operated gasoline gauge is at
the upper left side of the instrument group (fig. 3). It is wired
through the ignition switch; therefore, only indicates the
fig. 3-J'''tfllmtnt Grollp
amount of fuel in the tank when the
ignition switch is turned on.
Temperature Indicator. The water
temperature indicator is at the
lower left side of the instrument
group (fig. 3). It is, in effect, a ther-
mometer with the operating bulb
located in the water jacket at the
left. rear corner of the cylinder
head. Normally this thermometer
will register between 100 and 180
degrees when the engine is thoroughly warmed up. The driver
should watch this instrument closely, as a quick rise in tem-
perature usually indicates trouble. Should the temperature
rise above 212 degrees the engine should be stopped and a
check made for cause of overheating (see "Hints for Locating
Road Troubles ," page 91,
NOTE: Do not remove the radiator cap when engine is e"ces-
sively hot, do not put water in a bot engine and do Dot run en-
gine when indicator is above 212 degrees.
•• ' Anuneter (Battery Indicator). The ammeter -is the right upper
instrument in the group (fig. 3). The anuneter indicates the
flow of current to and from the battery, except the current
taken by the starting motor. When the engine is turned off
or idling and any of the electrical equipment is in use, it is
'4'

natural for the ammeter to show discharge. When the engine
is running at medium speed and most of the electrical equip..
ment is turned off the ammeter should show a slight charge,
depending on the state of charge of the battery. Should the
ammeter show discharge when the truck is being driven at
medium speed, trouble is indicated in the charging system
and the battery will soon become discharged.
Oil Pressure Gauge. This instrument is in the lower right side
of
the instrument group (fig. 3). The oU pressure gauge indi-
cates whether or - not the oil pump is working, but does not
indicate the amount of oil in the crankcase.
The pressure gauge reading is controlled by the engine
speed and the oil being used. A low reading is normal at idling
speeds with a warm engine and light oil; however, as the
engine speed is increased the hand should move over near the
"IS" mark. In cold weather (especially with heavy oil) the
hand may move over to ' the "30" mark at comparatively low
engine speeds. This indicates that the
oil is too heavy to properly lubricate
the engine.
NOTE: Do not accel erate the engine
excessive ly until the oil is suffi.
dently warm to permit a l ower pres-
su~. If the gauge does not show
any pressme, stop the engine im-
mediately and determine the cause.
Speedometer. The speedometer is
located to the right of the instru-
ment group (fig..A). As the vehicle
flg.4-Sp .. dom.'.,
is driven, the hand moves around the dial indicating the speed
of the vehicle in miles-per-hour. The figures visible through
the opening near the center of the speedometer indicate the
total mileage the truck has been driven. This part of the
speedometer is known as the odometer.
fIg. S_/gnitionSwl'd.
Switches
Ignition Switch. 'The ignition switch
is located near the bottom of the in-
strument panel to the right of · the
steering column (fig. 5).
'5 '

The ignition switch is located in the .low tension circuit and
wired between the battery and the coil. This switch is used to
make or break the ignition circuit when starting or stopping
the engine.
The key is turned clockwise to turn the switch on and
counterclockwise to turn the switch off.
Fie·6-UllfltlllgSw /ICh
Lighting Switch. The lighting
switch, located to the left of the in-
strument group (fig. 6), controls the
instrument lamps, headlamps, park-
ing lamps and tail lamp. When this
switch is pulled out to the first "on"
position the parking lamps and tail
lamp are lighted. When the switch
is pulled out to the last position the
headlamps and tail lamp are lighted.
Current for the lighting circuits
passes through a thermal circuit breaker located on the light-
ing switch behind the instrument panel. In case all lights fail
to operate, check for trouble at the thermal circuit breaker.
The instrument lights can be dimmed or turned off by turning
the light switch knob clockwise.
Dimmer Switch. The dimmer switch located on the toe·board
to the left of clutch pedal (fig. 10) is used to switch the head·
lamp beam from "high" to "low" or "low" to "high". Each
time the switch is depressed the light beam is reversed. A
headlamp beam indicator is located between the 0 and 80 at
the bottom of spe~dometer. When the lights are on upper beam
a red light is visible through the in-
dicator opening. Avoid use of upper
beam when meeting other vehicles
on the highway or in city traffic.
Dome Lamp Switch. The dome lamp
switch is located at the left end of
the dome lamp assembly directly
:::~g ~is rse:tc:~:cok:a;:g~u! fig. 1-~O':;~chUgh' find
. the light on and moving it forward turns the light off.
-6-

Horn Button. The horn button is
conveniently located at the center of
the steering wheel. Depre ssing the
button blows the horn.
Controls
Hand Throttle Control. The throttle
control knob is located on the instru -
ment panel directly above the igni-
tion switch (fig. 8). Pulling out on the
control knob opens the carburetor
throttle to provide a uniform engine
speed above the idle setting. It is fig. 8_T"ro"'. ond Choke
generally advisable to pull the hand Control.
throttle control out slightly when starting the engine, especially
if the engine has a tendency to stall a time or two after starting.
Choke Control. The carburetor choke control knob is located
directly' above the hand throttle control knob (fig. 8). The
purpose of this control is to dose (or partly close) the carbu-
retor choke valve. This restricts the air intake and produc es
a richer fuel mixture for starting while at the same time open-
ing the throttle by means of a fast idle link on the carburetor
on all truck models except those equipped with an updraft
carburetor.
When the engine is' warm and the weather is warm, it
should not be necessary to use the choke when starting the
engine. When it is necessary to use the choke for starting, it
should be pushed part way in as soon as the engine starts and
all the way in as ~ , on as the engine will run smoothly without
its use.
CAUTION: Excessive use of the choke will provide a fuel mix-
ture too rich to burn. Some of this unburned fuel wiD leak past
fig. 9_Starte. and Acc.l.ralor
' e dab
the pistons and dilute the engine
oil and result in improper lubrica-
tion, excessive engine wea~ and
poor performance.
Starter Pedal. The starter pedal is
located near the center of the toe
board to the right of the accelerator
pedal (fig. 9). Depressing this pedal
with the foot engages the starting
motor pinion with the teeth in the
'7'

engine flywheel and closes the starter switch to provide an
electrical circuit between the battery and starting motor, there-
by cranking the engine. The starting motor draws considerable
current from the battery; there fore, it sho uld not be operated
for more than 15 seconds at a time. If the engine does not star t,
locate the
cause and correc t it before the battery is run down.
CAUTION: The s tarter pedal must be relellSed til! soon as the
eneine starts and should never be depressed when the engine is
running or ser io us damage ma,. result.
Accelerator Pedal. The accel erator pedal, located to the left
of
the start er peda l (fig. 9), is used to open and close the
Fill. IO-C/",'(h and Itab 'adols
carburetor throttle valve.
The driver res ts his right foot
on this pedal
and by varying
the pressure applied, opens
the carburetor throttle th e
correc t amount to obtain the
desired engine or vehicle
speed.
Clutch Pedal. Th e clutch
pedal is conveniently located
for
use by the driver's left
foot (fig. 10).
It is used to
engage
and disengage the
clutch,
thereby connecting the eng ine to or disconnecting it
from the transmission
an d drive line to rear wheels.
The cl utch pedal should ha ve ;'4 to 1 inch free travel; if less
than %0" adjust free trave l (see Clutch Adj ustment, pa ge 41 ).
NOTE: Never d'iy e with the foot res tin l" on the dutcl! pedal as
this produces undue wear on th e throwout bearln, and othe r
pa
rts .
Brake Peda l. The brake pedal is located to the right of clutch
pedal (fig. 10).
Depressing this pedal applies the hydraulic
service brakes at all four wheels in propertion to the pressure
applied on the pedal. For peda l free trave l, see page 55.
Parking Brak e. On all11h. and 2 Ton, except C.O.E., the park-
ing brake is a propeller shaft brake, hand operated with l ever
extending up through floor to the right of the gear shift lever
and with the grip just below the instrument pan el ( fig. 2) .
Hand brake lever on C.O.E. is to the left of the gearshift lever.
Pulling this lever back applies the propeller shaft brake by
• 8 ·