Chevrolet 1948 light duty User manual

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"

LIGHT

"

and

HEAVY

"

11

" I ,

DUTY

TRUCKS

"

"1

, . , I

.

t

OPERATOR'S

MANUAL

FOR

1948

Chevrolet Light

and

Heavy

Duty

·Trucks

INTRODUCTION

Whim y

ou

pur

c

hased

your

new

Chevrolet

truck

it

was

a

bu

siness

investment

on

your

part.

You

can

rightl

y

expect

it

to

pay

divid

e

nds

on

th

e

investment

by

handling

your

hauling

and

transportation

requirements.

Ch

ev

rolet

tru

cks

are

d

es

igned

to

handl

e

maximum

loads effi-

ciently

and

economically,

provid-

ing

they

are

given

the

care

and

consid

e

ration

due

any

fine

piece

of

machin

e

ry

subjected

to

severe

operating

conditions.

This

booklet has

been

prepared

to

give

you

information

pertaining

to

the

driving,

care

and

mainte-

nanc

e of

your

truck

as

well

as

to

provide

technical

data

that

may

be of v

alue

or

interest

to

you.

The

s

ubject

index

at

the

right

is a

ready

reference

to

the

key

subjects

and

will

enable

you

to

find

any

subject

covered

in

the

booklet

.

Chevrolet Motor Division

General

Motors

Corporation

Detroit

2,

Mi~l'an

SUBJECT INDEX

Driver

's

Operatin(

Information

Page

Breaking-in

Period.

.......... 3

Controls

and

In

struments

4

Pr

estartin

g

Inspect

i

on

.......

_

13

Starting

thelngine

..

.

....

.

..

14

GearsMbn

g .

14

Cold

Weather

OperatIOn.

17

Hot

Weather

Operation

... .,.. .

18

Tire

Inflation.

..

.

........

19

T

ool

s

......

20

Description,

Care

and

Maintenance

Preventive

M

ai

ntenance

...

Engine

.

..

Cooling

System

Clutch

..

Transmission

.

..

.

·

11

·

11

..

34

.

40

41

Rear

Axle

.

..

.

hont

Axle

.. .

Steering

Ge

ar

Brake

Sy

stem..

43

.

....

'

45

.. .

47

S

prings

and

Sha

ckl

es

..

Electrical

System

...

Tires

..

Lubrication

·

48

51

58

Eng

in

e.. .

62

Rear

Axle

and

Transmiss

i

on

..

.

70

Universal

Joints

.. ..'

71

Front

Wheel

Bearings

..

73

Re

ar

Wheel

Bearings

..

.

73

Chassi

s.. .

74

Hints

for

Lot:ating

Road Troubles

Engine

...

Ughts

..

General.

.....

General

Information

81

.

85

..

86

Manufacturer

's

Warranty

...'

..

87

Tire

Warranty

.. .

...

.

88

Owner's

Se

rv

ice

Po

licy..

..

88

Service

Fa

c

il

i

ties

.. .

...

.

88

Labor

Charges

and

Repa

ir

Pa

r

ts

89

Technica1

Data

Unit

Capac

i

ly

Chart

.. ... ... !Il

lamp

Bulb

Chart

...

... !Il

Specificat

io

ns

... .

90

Adjustment

Specifications

....

92

load

Capacily

Chart.

.........

93

1ig. J

-Controls

and

'nstrumenfs-

'12

and

'I.

Ton

CHAPTER I

DRIVER'S

OPERATING

INFORMATION

BREAKING-IN PERIOD

The

moving

parts

of

your

Chevrolet

truck are preCISlon

built

to

very

close fits.

For

this

reason

high

speeds

should

be

avoided

and

special

attention

given

to

proper

lubrication

for

the

first 2,000 miles.

To

properly

break

in

the

moving

parts

and

assure

long

care-

free

service

do

not

drive

faster

than:

35 miles

per

hour

for

the

first 100 miles

45

miles

per

hour

for

the

50 miles

per

hour

for

the

Continuous

high

speed

driving

should

be

avoided

until

the

truck

has

been

driven

2,000 miles.

The

engine

should

not

be

raced

or

run

at

high

speed

in

lower

gears, especially

until

it

is

thoroughly

warmed

up.

Fig.

2-Conlrols

and

Instrumenls-I-I

'12

and 2

Ton

• 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-lnstrument

Group

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

140

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

200

degrees

the

engine

should

be

stopped

and

a

check

made

for cause

of

overheating

(see

"Hints for Locating

Road

Troubles,"

page

85).

NOTE:

Do

not remove the radiator

~ap

when engine

is

exces-

sively hot, do

not

put

water

in

a hot engine and do

not

run

en-

gine when indicator is above

212

degrees.

Ammeter

(Battery

Indicator).

The

ammeter

is

the

right

upper

instrument

in

the

group

(fig.

3).

The

ammeter

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

oil

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

"15"

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 accelerate the engine

excessively

until

the

oil

is

suffi-

ciently warm to permit a lower pres-

sur~.

If

the gauge does not show

any

pressure, stop

the

engine im-

mediately and determine the cause.

Speedometer.

The

speedometer

is

located

to

the

right

of

the

instru-

ment

group

(fig.

4).

As

the

vehicle

Fig.

4-Speeclomefe,

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.

5-lgnifion$wltch

Switches

Ignition

Switch.

The

ignition

switch,

located

near

the

bottom

of

the

in-

strument

panel

to

the

right

of

the

steering

column

(fig.

5),

is

used

to

• 5 •

"make"

and

"break"

the

ignition

circuit

when

starting

or

stop.-

ping

the

engine.

There

are

two

"off" positions,

one

to

the

right

and

one

to

the

left

of

the

"on"

(vertical)

position.

The

key

can

be

removed

with

the

ignition

switch

in

any

of

the

three

posi-

tions.

When

the

ignition

is

turned

off

by

turning

the

switch

clockwise

and

the

key

removed

the

ignition

can

.

be

turned

"on" or "off"

without

the

use

of

a

key.

When

the

ignition is

turned

off

by

turning

the

switch

counterclockwise

and

remov-

ing

the

key

the

ignition

is

locked

"off".

Fig.

6-1ighting

Switch

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

button

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

speedometer.

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

above

the

rear

window

(fig.

7).

Moving

this

switch

backward

turns

• 6 •

Fig.

7-Dome

Light and

Switch

the

light

on

and

moving

it

forward

turns

the

light

off.

Horn

Button.

The

horn

button

is

conveniently

located

at

the

center

of

the

steering

wheel.

Depressing

the

button

blows

the

horn.

Controls

Hand

Throttle

Control.

The

throttle

control

knob

is

located

on

the

in-

strument

panel

directly

above

the

ignition

switch

(fig.

8).

Pulling

out

on

the

control

knob

opens

the

car_

fig,

8-Throtfle

and

Choke

Controls

buretor

to

provide

a

uniform

engine

speed

above

the

idle

set..:.

ting.

It

is

generally

advisable

to

pull

the

hand

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

close

(or

partly

close)

the

carbu-

retor

choke

valve

restricting

the

air

intake

and

producing

a

richer

fuel

mixture

for

starting.

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

soon

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

will

leak

past

Fig.

9-Starter

and

Accelerafor

Pedals

the

pistons

and

dilute

the

engine

oil

and

result

in

improper

lubrica-

tion,

excessive

engine

wear

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

• 1 •

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;

therefore,

it

should

not

be

operated

for

more

than

15 seconds

at

a time.

If

the

engine

does

not

start,

locate

the

cause

and

correct

it

before

the

battery

is

run

down.

CAUTION:

The

starter pedal must be released as soon as the

engine starts and should

never

be depressed

when

the engine

is

running or serious damage may result.

Accelerator

Pedal.

The

accelerator

pedal,

located

to

the

left

of

the

starter

pedal

(fig.

9),

is

used

to

open

and

close

the

Fig. J

o-ell/reh

and

Brake

Pedals

carburetor

throttle

valve.

The

driver

rests

his

right

foot

on

this

pedal

and

by

varying

the

pressure

applied

opens

the

carburetor

throttle

the

correct amount

to

obtain

the

desired

engine

or

vehicle

speed.

Clutch

Pedal.

Is

conveniently

located

for

use

by

the

driv-

er's

left

foot (fig. 10).

It

is

used

to

engage

and

disengage

the

clutch,

thereby

connect-

ing

the

engine

to or disconnecting it from

the

transmission and

drive

line

to rear

wheels.

The

clutch

pedal

should

have

%

to

1

inch

free

travel;

if less

than

%"

adjust

free

travel

(see

Clutch

Adjustment,

page

41).

NOTE:

Never

drive with the foot resting on the clutch pedal as

this produces

undue

wear

on

the throwout bearing and other

parts.

Brake

Pedal.

Located

to

the

right

of

clutch

pedal

(fig.

10).

Depressing

this

pedal

applies

the

hydraulic

service

brakes

at

all

four

wheels

in

proportion

to

the

pressure

applied

on.

the

pedal.

Hand Brake

Lever-I-I¥.

and 2 Ton.

Extends

up

through

floor

to

the

right

of

the

gear

shift

lever

with

the

grip

just

below

the

instrument

panel

(fig.

2).

Pulling

this

!ever

back

applies

the

rear

wheel

brakes

by

means

of

mechanical

linkage

entirely

independent

of

the

hydraulic

system.

To

release

brakes,

grip

• 8 •

the

two sections of

the

handle

and

pull lever

back

slightly,

then

move

it

forward.

Foot

Operated

Parking

Brake

Pedal-'h

and

3/

4 Ton.

Parking

brakes

on all

'h

and

%

ton

models

are

pedal ·operated.

The

operating pedal (fig. 10) is located

to

the

left of

the

clutch

pedal

and

'pressing down on this pedal applies

the

rear

wheel

brakes

through

mechanical linkage entirely independent of

the

hydraulic system. To release

the

brakes

a release

lever

is

mounted

on

the

instrument

panel.

Gearshift

I-ever

(4-speed Synchro-mesh Transmission).

Ex-

tenq.

to

the

left

and

back

from transmission cover dome

at

cen-

ter

of floor (fig. 2). This

lever

is

used

to

shift

the

transmission gears

to

the

desired position.

Figure

11 shows

the

lever

knob

positions

when

the

trans-

mission

is

in

neutral, reverse and the

four

forward

speeds. To shift

the

transmission into any

of

the

forward

speeds, disengage

the

clutch,

move

Fig.

II-Four

Sp

••

d

the

lever

across neutral to right or T,an.mission Shlflin9 Diagram

left

as

desired,

and

then

forward

or

back into gear.

To shift into reverse, disengage

the

clutch, move

the

lever

to

the

left against

the

spring tension as

far

as

it

will

go

and

pull

it

back

into reverse position.

Gearshift

Lever

(3-speed Synchro-mesh Transmission).

Gear-

shift control on all 'h

and

% ton

trucks

with

3-speed transmission

is

REV.

2- D located on

the

steering column (fig.

3-D

1).

This mounting

at

the

upper

end

of

the

steering column

and

the

gear-

shift

lever

are

similar to those used

on

the

passenger car.

The

shift

pat-

tern is

the

same

as heretofore

except

that

it

is

now

in a vertical plane in-

stead

of a horizontal plane as witli

Fig.

12-Thre~SpHd

the

floor mounted gearshift

lever

.

Transmiuion Shit,ing -Diagram Figure 12

shows

the gearshift

pat-

tern

in neutral,

reverse

and three forward speeds. To shift into

any

gear position, disengage

the

clutch, move

the

shift

lever

up

or

down from

neutral

position

and

then

forward

or

back

into

the

desired gear.

• 9 •

Cowl Ventilator

Control

Knob.

This

knob

located

below

'/g.

'3-Cowl

Sid.

VMtllator Con,,01

Knob

the

instrument

panel

in

line

with

the

ignition

switch

(figs. 1

and

2) is

used

to

open

and

close

the

cowI ventila-

tor.

When

the

knob

is

up

toward

the

instrument

panel

the

ventilator

is

closed

and

locked.

By

pushing

the

lever

down

and

forward,

the

desired

amount

of

air

circulation

can

be

ob-

tained.

Side Cowl

Ventilator

Control

Knob.

This

knob

extends

through

the

left

side cowl

trim

pad

just

below

the

instrument panel (fig. 13).

Pushing

the

knob

forward

opens

Fig

.

'4-Ash

Tray

the

ventilator

in

the

left side of cowl

and

pulling

the

knob

back

closes

the

ventilator

.

Ash

Tray. A convenient

ash

tray

is

located

in

the

instrument

panel

to

the

left of

the

package

compartment

(fig.

14).

The

tray

is

opened

or

closed

by

pulling

back

or

pushing

forward

on

the

handle. .

Instrument

Panel

Compartment

Lock.

The

door to

the

convenient

package

compartment

at

the

right

end

of

instrument

panel

is

controlled

by

a lock above

the

com-

partment

(fig. 15).

When

the

lock is

unlocked, depressing

the

lock cyIin-

der

releases

the

latch

and

the

door

opens.

When

the

lock is locked

the

cylinder

cannot

be

depressed.

The

key

used

for

the

door lock

and

igni-

ti

on

switch

is used to lock

and

un-

lock

the

package

compartment.

FIg. J5

-Packoge

Compartment

Lock

Keys.

Two

identical

(octa

g

onal

head)

keys

are

furnished

with

each

truck.

These

keys

are

used

for locking

and

unl

ocking

the

right

door

,

the

package

compartment

and

ignition.

The

key

number

is

stamped

on

a

"knockout"

plug

in

each

key

(fig. 16).

The

•

10

•

dealer

and

the

owner

should

make

a

record

of

this

number

so

that

the

key

can

be

easily

replaced

in

case

it

is lost, and then the "knockout"

plug

should

be

removed

so

that

un-

authorized

persons

cannot

obtain

the

key

number

and

have

a

dupli-

cate

made.

Fig.

'6-Key

Door

Locks.

Your

Chevrolet

truck

is

equipped

with

theft-

resisting

door

locks

which

provide

a

means

of

locking

the

cab

when

the

truck

is

to

be

left

un-

attended

and

a

means

of

locking

it

from

the

inside.

The

right

door

lock

cylinder

is

located

in

the

door

below

the

door

handle.

To

unlock

the

right

door

in-

sert

key

in

lock

and

turn

key

clock-

wise

as far as

it

will go

and

back

Fig.

17-Door

Lock

and

Key

to

vertical

position

to

remove

key

(fig.

17).

To

lock

the

door

insert

key

in

lock

and

turn

key

counterclockwise

as

far

as

it

will

go

and

back

to

ver-

tical

position

to

remove

key.

To

lock

either

door

from

the

inside

it

is

only

neces-

sary

to

move

the

inside ..re-

mote

control

handle

up

(fig.

18).

Pushing

down

on

the

inside

handle

unlocks

the

door

even

when

it

has

been

locked

with

a key. Fig. J

8-Door

Remote Control

and

Window Regulotor

Window

Regulators.

The

door

win-

dows

are

opened

and

closed

by

turning

the

window

regulator

han-

dles

located

near

the

front

upper

cor-

ner

of

each

door

inner

panel

(fig. 18).

Windshield

Wiper.

The

windshield

wiper

motor

is

mounted

under

the

instrument

panel

and

is

vacuum

op-

erated

from

the

engine.

The

control

knob

located

on

the

instrument

•

11

•

fig.

'9-Windsltield

Wip.r

Control

Knob

panel

above

the

choke

button

(fig. 19) is

used

to

turn

the

wiper "on" or "off".

Moving

the

knob

to

the

left

turns

the

wiper

on

and

moving

it

to

the

right

decreases

wiper

speed

or

turns

it

off completely.

Rear

View

Mirror.

An

adjustable rear

view

mirror

is

mounted

on

the

left

side of

cowl

in

a

position

so

that

the

driver

can

get

a

clear

vision

along

the

left

side

of

truck

by

looking

at

the

Fig_

20-Seaf

Ad;usfer

mirror

through

the

left

door

window.

Seat

Adjuster.

The

entire

seat

as-

sembly

can

be

moved

forward

or

back

to

obtain

the

most

comfortable

position for

the

driver.

As

the

seat

is

moved

forward it raises and tips for-

ward and as

it

is

moved

hack

it

is

lowered

to

accomodate

a

tall

person.

Moving

the

adjuster

handle

forward

(fig. 20)

releases

the

seat

adjuster

lock

so

that

the

seat

assembly

can

be

moved

for-

ward or hack as desired.

Two

coil springs·assist in

moving

the

seat

forward.

Fig.

21

-Hood

Lock

Release

Hood

Lock

and

Safety

Catch.

The

hood

is

of

the

"alligator

jaw"

type

and

is

held

closed

by

a lock

at

the

front.

This

lock

• 12 •

can

be released

by

reaching

in

below

the

upper

grille

bar

in

line

with

the

left

end

of

name

plate

and

pulling

the

lever

for-

ward

(fig 21).

The

safety catch can

then

be

released

by

reaching

under

the

nose of hood

and

pulling

forward

and

up

on

the

catch

re-

lease (fig. 22).

The

hood

can

then

be

pushed

up

to

the

open posi-

tion.

The

spring loaded hood

support

will

a~ist

in

raising

the

hood

and

hold

it

open.

To close

the

hood,

lower

it

to

the

safety

latch

posi-

tion

and

then

push

down

on

nose of hood to lock it.

fig.

22_Hood

Salety Catth Release

PRE-STARTING INSPECfION

The

following inspections

are not necessary each time

the

vehicle is

started

provid-

ing

the

driver

has

recently

driven

the

vehicle

and

is

cer-

tain that attention is not re-

quired,

1.

Raise

the

hood,

remove

the

oil gauge

rod

from

right

side of crankcase

just

back

of

distributor

(fig. 23), wipe

oil from

rod

with

clean cloth

and

replace. Remove

gauge

rod

and

note

level of oil.

If

down to the "add oil" mark,

oil should

be

added.

See

"Lubrication Instructions."

Install oil gauge rod. Fig.

23-0il

Gaug.

Rod

2.

Remove

radiator

cap

and

check

the

level

of coolant.

If

coolant is down a quart or more,

water

or anti.:.freeze should

be

added.

3.

Check

to

make

sure

the

tires

are

properly

inflated.

Un-

derinflated tires

wear

rapidly

and

are

subject

to road damage.

." 13 "

4.

Rear

window,

windshield

and

headlights

should

be

cleaned

to

provide

clear

vision

and

good lights.

STARTING THE ENGINE

1.

Place

ignition

key

in

switch

and

turn

key

to

vertical

position

to

tUrn

on

ignition.

2.

Pull

hand

throttle

out

about

%"

to

provide

an

engine

speed

just

above

"idle."

This

is

not

always

necessary

in

warm

weather or

with

a warm engine, especially if the carburetor is

adjusted

for

a

fast

idle.

3.

Pull

choke

button

out

part

or

all

the

way

depending

on

cli-

matic

conditions.

If

the

engine

is

warm

or

in

summer

weather

it

is

not

generally

necessary

to

use

the

choke

at

all.

In

extremely

cold

weather

the

choke

should

be

pulled

all

the

way

out.

4. Make

sure

the transmission shift

lever

is

in

neutral.

De-

press

the

clutch

pedal

to

relieve

the

load

in

the

transmission.

5.

Step

on

starter

pedal

to

crank

engine.

Remove

foot from

starter

pedal

as

soon

as

engine

starts.

If

engine

does

not

start

in

15 seconds,

release

pedal

and

check

to

see

that

the

above

operations

have

been

completed.

6.

As

soon

as

engine

starts,

push

choke

button

in

part

way

and

adjust

throttle

for

smooth

idle.

7.

Note

oil

gauge

and

ammeter

readings.

Ammeter

should

show

some

charge

unless

engine

is

idling

slowly.

Oil

gauge

should

show

some

pressure.

In

unusually

cold

weather

the

oil

gauge

needle

may

go

over

nearly

to

30.

If

so,

run

the

engine

just

above

idling

speed

until

the

pressure

drops

to

around

15

before

driving

vehicle.

The

choke

and

throttle

should

be

pushed

in

all

the

way

as

soon

as

the

engine.

is

sufficiently

watmed

up.

GEARSHIFl'ING

Starting

the

Vehicle

1.

Push

clutch

pedal

down

to

disengage

the

clutch.

2.

Move

gearshift

lever

into

low

gear

position.

(If

4-speed

transmission

see

Figure 11,

or·

if 3-speed transmission

see

Figure

12.)

3.

Release

the

parking

brake.

4.

Push

down

slightly

on

accelerator

pedal

and

at

the

same

time

slowly

engage

the

clutch.

Continue

to

depress

the

accel-

erator

pedal

until

the

vehicle

is

moving

.

•

14

•

Shifting

to

Higher Gears.

1. Depress clutch pedal

and

release accelerator

at

the

same

time. Move

the

shift

lever

into

neutral

and

then

to

the

Figures

11

and

12.

2. Accelerate

the

engine slightly

and

slowly engage

the

clutch.

3.

Accelerate

the

engine

to

about

'/3

maximum

engine speed

before shifting to

the

gear

and

proceed as outlined

above.

Shifting to Reverse (4-speed transmission).

The

vehicle

must

not

be moving

forward

when

shifting to

reverse.

1. Depress clutch

pedal

to disengage

the

clutch.

2. Move shift

lever

across

neutral

to left, against

the

spring

tension

as

far

as

it

will go. Move

lever

back

into reverse

(fig. 11).

3.

If

parking

brake

is on, release

the

brake.

4.

Push

down slightly

on

accelerator pedal

and

at

the

same

time slowly engage

the

clutch. Control

the

vehicle speed

with

the

accelerator.

Shifting to Reverse (3-speed transmission).

Th

e vehicle should

not

be

moving

forward

when

shifting

to reverse.

1. Depress clutch pedal to disengage

the

clutch.

2. Raise shift

lever

up

across

neutral

and

forward into

re-

verse

position. (fig. 12).

3.

If

parking

brake

is on, release

the

brake

.

4.

Push

down slightly

on

accelera

tor

pedal

and

at

the

same

time slowly engage

the

clutch. Control

the

vehicle speed

with

the accelerator.

Shifting

to

Lower

Gears

To obtain more pulling

power

for negotiating

bad

roads

or

climbing hills,

or

to

travel

at

unusually

slow speed

it

is

sometimes necessary to shift to lower transmission gears.

The

shift from

high

to second with

the

3-speed synchro-mesh

transmission

or

from high to

third

or

third

to second

with

the

4-speed synchro-mesh transmission is accomplished

in

the

same

manner

as

up.shifting

.

•

15

•

The

following

procedure

should

be

used

when

shifting

the

3-speed

or

4-s

peed

transmission

from

second to low.

1.

Disengage

the

clutch

and

shift

the

transmission into

neutral

while maip.taining

enough

pressure

on

accelerator

to

noticeably increase

engine

speed.

2.

Engage

clutch

and

quickly

disengage

it

again.

3.

Shift

into

the

gear

quickly

and

then

gradually

engage clutch.

Shifting

Two-Speed Rear Axle.

The

n

ew

vacuum

shift

makes

this

operation

comparatively

simple as it

is

unnecessary

to de-

clutch

while

shifting.

The

control

lever

for

the

vacuum

shift

is

located

bel

ow

the

instrument

panel

·

and

to

the

right

olthe

steering

column

(fig.

24).

Turning

this

lever

also shifts

the

speedometer

adapter

to

main-

tain reasonably accurate speedom-

eter

and odometer

reading

regard-

less of

the

axle

ratio

used.

To

shift

from low

speed

to

high

fig.

24_Two_Sp

••

d Axle Shift

speed,

move

control

lever

to

high

Control

speed

position,

as

indicated

on

uDECAL" above speedometer,

release

accelerator, pause a

second to allow engine

speed

to

drop

down,

then

again

step

down

on the accelerator.

To

shift

from

high

speed

to low speed, move control

lever

to

low

speed position, release accelerator and again step

down

on accelerator.

Stopping

the

Vehicle.

1. Remove foot from

accelerator

and

place

it

on

brake

pedal.

Push

down

on

pedal

to slow

the

vehicle down

gradually

(unless

an

emergency

stop).

2.

When

th

e vehicle is

nearly

stopped, disengage

th

e

clutch

and

shift

the

transmission to

neutral,

co

ntinuing

to apply

the

brakes

until

the

vehicle

is

stopped.

3.

If

vehicle is to

stand

any

length

of

time

set

parking

brak

e, release

clutch

pedal

artd foot brake.

Starting

on

an

Upgrade.

1.

Set

the

parking

brake

to

hold

the

vehicle from rolling

back.

2.

Disengage

clutch

and

shift

transmission

into

low

gear.

3.

Accelerate

the

engine

and

slowly

release

clutch

pedal

until

clutch

starts

to

engage,

then

gradually

release

the

park-

ing

brake

as

the

clutch

engages

and

the

vehicle

starts

to

move

forward.

COLD WEATHER OPERATION

Cold

weather

presents

many

problems

to

the

motoring

pub-

lic;

however,

your

Chevrolet

truck

will

be

equally

dependable

in

cold

weather

if

given

a

minimum

amount

of

attention.

1.

The

cooling

system

must

be

protected

against

freezing

by

the

use

of

anti-freeze

solutions

(see

"Cooling

System"

and

"Anti-Freeze"),

or

the

system

must

be

drained at

the

lower

right corner

of

radiator

and

the

left

rear corner

of

cylinder

block

each

time

the

vehicle

is

to

stand

any

length

of

time.

2.

Light

oil

should

be

used

in

the

engine

(see

"Engine

Lubrication").

3.

The

battery

should

be

kept

fully

charged

to

provide

the

additional

power

necessary

to crank a cold engine and furnish

a good

spark.

A

discharged

battery

will

freeze

in

extremely

cold

weather

which

will

make

battery

replacement

necessary.

4.

The

carburetor,

fuel

pump

and

fuel

tank

should

be

kept

free

from

water

which

will

freeze

and

restrict

fuel

flow.

5.

The

ignition

system

should

be

kept

in

good condition.

6.

Assuming

that

the

above

items

have

been

given

normal

attention,

the

engine

should

start promptly,

even

in

extremely

cold

weather,

by

following

this

simple

procedure:

a.

Turn

on

ignition.

b.

Pull

hand

throttle

out

about

'h".

c.

Pull

choke

button

all

the

way

out.

d.

Depress

foot

accelerator

slowly a few times.

e.

Disengage

the

clutch.

f.

Step

on

starter

pedal.

g.

Release

starter

as

soon

as

engine

starts

and

push

choke

button

in

slightly.

h.

Regulate

hand

throttle

to

provide

a

fast

idle

and

gradu-

ally

push

choke

button

in

as

engine

warms

up.

i.

In

abnormally

cold

weather

the

engine

should

be

run

slightly

above

idling

speed

for

a

few

minutes

to

warm

up

the

oil

before

driving

the

truck

.

•

17

•

NOTE:

Never race the engine

untH

the oil gauge needle will stay

around

15.

7.

The

Chevrolet

cooling

system

is

designed

to

properly

cool

the

engine

under

most

severe

operating·conditions in

hot

weather.

A

thermostat

is

used

in

the

system

to

restrict

the

water

circulation

until

the

engine warms up.

In

very

cold

weather

and

under

certain driving conditions

such

as

house

...

to-house

delivery

where

the

engine

idles a

lot

or

is

stopped

and

started

frequently,

the

production

thermostat

does

not

maintain

high

enough

temperature

for

best

economy

and

per-

formance.

In

this

case

a

higher

temperature

thermostat

should

be

used

or

part

of

the

radiator

area

covered.

HOT

WEATHER

OPERATION

Hot

weather

does

not

generally

present

as

many

problems

as cold weather,

however,

a little special attention

will

pay

dividends in

the

form

of

economy and convenience.

1.

Check

the

radiator

regularly

for

sufficient

coolant

as

the

rate

of

evaporation is higher in

hot

weather.

2.

Make

sure

the

fan

belt

is

in

good

condition

and

properly

adjusted.

3.

Keep

the

radiator

area

free

of

bugs

and

other

things

that

restrict air circulation.

4.

Have

the

water

level

in

the

battery

checked

at

lO-day

intervals.

5.

Starting a cool engine

in

hot

weather

does

not

present a

problem

and

the

procedure

outlined

under

"Starting

the

En-

gine"

should

be

followed.

A

hot

engine

is

easily

flooded

and

may

start

hard.

If

the

carburetor

is flooded

proceed

as

follows:

a.

Turn

on

ignition.

b.

Pull

hand

throttle

out

about

'h".

c.

Do

not

pull

choke

button

out

or

step

on

accelerator.

d.

Depress

starter

pedal

without

depressing

accelerator.

e.

When

engine

starts,

release

starter,

but

do

not

accelerate

engine.

f.

Regulate

hand

throttle

for

desired

engine

speed.

If

the

engine

still

does

not

start

look

for

trouble

in

the

fuel

pump

or ignition

systems

.

• 18 •

Chevrolet 1948 light duty User manual

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