1967 CHEVROLET CAMARO low oil pressure

ENGINE FUEL 6M-11

dripping fuel, but a leak on the suction would not be ap-

parent except for its effect of reducing volume of fuel on

the pressure side.

1.
Tighten any loose line connections and look for bends

or kinks in lines.

2.
Disconnect fuel pipe at carburetor. Disconnect dis-

tributor to coil primary wire so that engine can be

cranked without firing. Place suitable container at

end of pipe and crank engine a few revolutions. If

little or no gasoline flows from open end of pipe then

fuel pipe is clogged or pump is inoperative. Before

removing pump disconnect fuel pipe at gas tank and

outlet pipe and blow through them with an air hose

to make sure they are clear. Reconnect pipes and

retest while cranking engine.

CAUTION: Whenever the engine is cranked re-

motely at the starter, with a special jumper

cable or other means, the primary distributor

lead must be disconnected from the negative

post on the coil and the ignition switch must be

in the "ON" position. Failure to do this will

result in a damaged grounding circuit in the

ignition switch.

3.
If fuel flows from pump in good volume from pipe

at carburetor, check fuel delivery pressure to be

certain that pump is operating withint specified limits

as follows:

a. Attach a fuel pump pressure test gauge to dis-

connect end of pump to carburetor pipe.

b.
Run engine at approximately 450-1,000 rpm (on

gasoline in carburetor bowl) and note reading on

pressure gauge.

c. If pump is operating properly the pressure will

be within specifications and will remain constant

at speeds between 450-1,000 rpm. If pressure

is too low, too high, or varies materially at dif-

ferent speeds, the pump should be replaced.

Removal

1.
Disconnect fuel inlet and outlet pipes at fuel pump.
Fig.
2P-Installing 283, 327, 350 V8 Engine Fuel Pump

2.
Remove fuel pump mounting bolts and remove pump

and gasket.

3.
On V8 engines; if push rod is to be removed, remove

pipe plug then remove push rod (396 and 427 cu. in.

engines), remove fuel pump adapter and gasket then

remove push rod (283 and 327 cu. in. engines).

4.
If a new fuel pump is to be installed, transfer

fittings.

Installation

1.
On V8 engines; if removed, install fuel pump push

rod and pipe fitting or fuel pump adapter. Use.

gasket sealer on gasket or pipe fitting.

2.
Install fuel pump using a new gasket and tighten

securely. Use sealer on fuel pump mounting bolt

threads.

NOTE:
On V8 engines, a pair of mechanical

fingers may be used to hold fuel pump push rod

up while installing fuel pump (fig. 2P).

3.
Connect fuel pipes to pump.

4.
Start engine and check for leaks.

CHEVROLET CHASSIS SERVICE MANUAL

AIR INJECTOR REACTOR SYSTEM
6T-3

MIXTURE

CONTROL

VALVE

SIGNAL

PUMP PRESSURE

(MIXTURE VALVE INLET)

PUMP PRESSURE

(AIR MANIFOLD INLET)

IN LINE
AIR INJECTION

PUMP INLET

MIXTURE

CONTROL

VALVE

SIGNAL

MIXTURE

CONTROL

VALVE

OUTLET

MIXTURE

CONTROL

VALVE

INLET
AIR INJECTION

PUMP INLET

V8 (TYPICAL)
PUMP PRESSURE

(AIR MANIFOLD INLET)

MIXTURE CONTROL

VALVE INLET

MIXTURE CONTROL

VALVE SIGNAL

AIR INJECTION

PUMP INLET

PUMP PRESSURE^

(AIR MANIFOLD

J

MIXTURE CONTROL

VALVE OUTLET
V8 (396-427)

Fig.
4—Air Manifold Hose and Tube Routing (Typical)
a straight pipe thread.
Do
not use
a 1/4"
tapered

pipe
tap. The
hoses
of
the
Air
Injection Reactor

System
are a
special material
to
withstand high

temperature.
No
other type hose should
be

substituted.

• Install
new
hose(s) and/or tube(s), routing them
as

when removed.

• Tighten
all
connections.

NOTE:
Use
anti seize compound
on
threads
of

the
air
manifold
to
exhaust manifold
or
cylinder

head connections.

NOTE:
On
Chevy
n
vehicles equipped with
a

V8 engine,
the air
injection tubes
are
part
of the

air manifold
and
care must
be
used
in
removing

them from
the
exhaust manifold.
It may be

necessary
to
remove
the
exhaust manifold
and

use penetrating
oil on the
injection tubes before

the
air
manifold can
be
removed.

Check Valve

Inspection

•
The
check valve should
be
inspected whenever
the

hose
is
disconnected from
the
check valve
or
when-

ever check valve failure
is
suspected. (A pump that

,
had
become inoperative and had shown indications
of

having exhaust gases
in the
pump would indicate

check valve failure)..

• Orally blow through
the
check valve (toward
air

manifold) then attempt
to
suck back through check

valve. Flow should only
be in one
direction (toward

the
air
manifold).

Replacement

• Disconnect pump outlet hose
at
check valve. Remove

check valve from
air
manifold, being careful not
to

bend
or
twist
air
manifold.

Mixture Control Valve

Inspection

• Check condition
and
routing
of all
lines especially

the signal line.
A
defective signal
or
outlet line will

cause malfunctioning
of the
mixture control valve.

• Disconnect pump
to
valve inlet hose
at
pump.

• Leaking valve will
be
indicated
by an air
gushing

noise coming from
the
hose. Place palm
of
hand over

hose; little
or no
pull with
a
gradual increase
is

normal.
If
immediate strong pull
is
felt
or air
noise

is heard, valve
is
defective
and
should
be
replaced.

• Open
and
close throttle rapidly.
Air
noise should
be

evident
and
then gradually decrease. Check
for

proper valve usage.
If
strong pull
is not
felt
im-.

mediately
or air
noise
is not
present, valve
is not

functioning properly and should be replaced.

•
A
noisy valve should be replaced.

Replacement

• Disconnect
the
signal line,
air
inlet
and air
outlet

hoses then remove
the
valve.

• Install
new
valve
and
connect
air
outlet,
air
inlet

and signal line hoses.

CAUTION: Mixture control valves, though

similar
in
appearance
are
designed
to
meet

particular requirements
of
various engines,

therefore,
be
sure
to
install
the
correct valve.

CHEVROLET CHASSIS SERVICE MANUAL

AIR INJECTOR REACTOR SYSTEM 6T-4

Air injection Tube

Inspection (Fig. 5)

• There is no periodic service or inspection for the

air injection tubes, yet on In Line engines whenever

the cylinder head is removed or on V8 engines when-

ever the exhaust manifolds are removed, inspect the

air injection tubes for carbon build up and warped or

burnt tubes.

• Remove any carbon build up with a wire brush.

• Warped or burnt tubes must be replaced.

Replacement

• On In Line engines remove carbon from tubes and

using penetrating oil, work tubes out of cylinder

head.

• On V8 engines clamp exhaust manifold in a vise,

remove carbon from tubes and using penetrating oil,

work tubes out of manifold.

• Install new tubes in cylinder head or manifold.

Air Injection Pump

Inspection

Accelerate engine to approximately 1500 KPM and

observe air flow from hose.Osf). If air flow increases as

engine is accelerated, pump is operating satisfactorily.

If air flow does not increase or is not present, proceed

as follows:

• Check for proper drive belt tension.

• Check for a leaky pressure relief valve. Air maybe

heard leaking with the pump running.

NOTE:
The Air Injection Reactor System is

not completely noiseless. Under normal condi-

tions noise rises in pitch as engine speed in-

creases. To determine if excessive noise is the

fault of the Air Injection Reactor System, oper-

ate the engine with the pump drive belt removed.

IN LINE

INJECTION

si

AIR AAANIFOLD^

ASSEMBLY
AIR MANIFOLD

ASSEMBLY ^S

~jk
VALVE

V-8

ff

>yi
INJECTION

» TUBE
' ,•

Fig.
5—Air Injection Tube (Typical)
Fig.
6-HRemoving Pressure Relief Valve

If excessive noise does not exist with the belt

removed proceed as follows:

Check for proper installation of relief valve silencer

on L-6 and 283, 327, 350 cu. in. V-8 engines.

Check for a seized Air Injection Pump.

Check hoses, tubes, air manifolds and all connec-

tions for leaks and proper routing.

Cheqk carburetor air cleaner for proper installation.

Check air injection pump for proper mounting.

If none of the above conditions exist and the air in-

jection pump has excessive noise remove then repair

as outlined in the Overhaul Manual.

Replacement

Disconnect,
t&e
hoses at the pump.

Remove pump pulley as outlined.

Remove pump mounting bolts and remove pump.

Install pump with mounting bolts loose.

Install pump pulley as outlined.

Install and adjust belt as outlined.

Connect the hoses at the pump.

Pressure Relief Valve Replacement

1.
Using J-7055-5 and J-6585 pull relief valve from

housing (fig. 6).

2.
Using a 15/16" socket tap the relief valve into hous-

ing until the valve shoulders on the housing (fig. 7).

CAUTION: Use extreme care to avoid distort-

ing housing.

NOTE:
Various length pressure setting plugs

(fig. 8) designed for the particular requirements

of vehicle - engine combinations, determine the

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-4

5.
Install Tool J-5824 to support the clutch assembly

during removal.

NOTE: Look for "X" mark on flywheel and on

clutch cover. If MX" mark is not evident, prick

punch marks on flywheel and clutch cover for

indexing purposes during installation.

6. Loosen the clutch-to-flywheel attaching bolts evenly

1 turn at a time until spring pressure is released,

then remove the bolts, and remove clutch assembly.

Installation to Vehicle

Clean pressure plate and flywheel face. (They should

be free of oil, grease, metal deposits or burned spots).

1.
Position the clutch disc and pressure plate in relar

tive installed position and support them with align-

ment Tool J-5824.

NOTE: The driven disc on the 4 and 6 cylinder

engines is installed with the damfper springs to

the flywheel side; the V-8 is opposite, however,

THE GREASE SLINGER IS ALWAYS ON THE

TRANSMISSION SIDE.

2.
Turn clutch assembly until "X" mark on cover lines

up with "X" mark oh flywheel, then align cover bolt

holes to nearest flywheel holes.

3.
Install a bolt in every hole and tighten down evenly

and gradually until tight (to avoid possible clutch

distortion).

NOTE: Cover loads are as high as 1-1/4 tons.

4.
Remove pilot tool.

5.
Unhook clutch fork and lubricate ball socket and fork

fingers at release bearing end with a high melting

point grease such as graphite and reinstall fork on

ball stud. On Corvette models use Moly Grease.

6. Lubricate the recess on the inside of throwout bear-

ing collar and the throwout fork groove with a light

coat of graphite grease (fig. 4). On Corvette models

use Moly Grease.

7.
Install clutch fork and dust boot into clutch housing

and install throwout bearing to the throwout fork, then

install flywheel housing.

8. Install transmission as outlined in transmission

section.

9. Connect fork push rod and spring.

10.
Adjust shift linkage as outlined in transmission

section.

11.
Perform linkage adjustment for pedal free play and

check clutch release position.

CLUTCH PEDAL

The clutch pedal is the pendant-type hung from a sup-
Fig. 5 - Release Bearing Lubrication and Comparison

port brace common to the brake pedal and must be re-

moved to remove brake pedal. Refer to Section 5 for

brake and clutch pedal service procedure.

CLUTCH CROSS SHAFT (Figs. 6, 7 & 8)

Removal

1.
Remove linkage return and lower linkage springs and

disconnect clutch pedal and fork push rods from re-

spective cross shaft levers.

2.
Loosen outboard ball stud nut and slide stud out of

bracket slot.

3.
Move cross shaft outboard, and as required to clear

inboard ball stud, then merely lift out to remove

from vehicle.

Repairs

The cross shaft has nylon ball stud seats which should

be inspected for wear or damage. Also check condition

of engine bracket ball stud assembly and special anti-

rattle "O" ring. Figures 6, .7
&
8 show component parts

of cross shaft. Replace parts as necessary based on wear

or damage. Lubricate ball studs and seats with graphite

grease before reassembly.

Installation

1.
Reverse removal procedure to install.

2.
Adjust clutch linkage as previously outlined.

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH
AND
TRANSMISSIONS
7-23

Assembly (Fig.
4X)

1.
With detent spring tang projecting
up
over
the 3rd

and
4th
shifter shaft cover opening install
the
first

and second detent
cam
onto
the
detent
cam
pivot
pin.

With
the
detent spring tang projecting
up
over
the

first
and
second shifter shaft cover hole install
the

3rd
and 4th
detent
cam,

NOTE:
The 1-2
detent
cam has a
.090" greater

contour
on the
inside detent notch.

2.

3.
Install detent
cam
retaining
"C"
ring
to
pivot shaft,

and hook spring into detent
cam
notches.

Install
1-2 and 3-4
shifter shaft assemblies
in
cover

being careful
not to
damage seals. Install both shift

forks
to
shifter shaft assemblies, lifting
up on
detent
cam
to
allow forks
to
fully seat into position.

4.
Install reverse detent ball
and
spring
to
cover, then

install reverse shifter shaft assembly
to
cover.

5.
Install outer shifter levers, flat washers, lock wash-

ers
and
bolts.

Installation

1.
Shift shifter levers into neutral detent (center) posi-

tion. Position cover gasket
on
case.

2.
Carefully position side cover into place making sure

the shift forks
are
aligned with their respective

mainshaft clutch sliding sleeves.

Install cover attaching bolts
and
tighten evenly
to

specified torque.

Remove filler plug
and add
lubricant specified
in

Section
0, to
level
of
filler plug hole.
3.

4.

ALUMINUM POWERGLIDE

INDEX

Page

General
Description
7-23

Maintenance
and
Adjustments .............. 7—23

Oil
Level Check
7-23

Periodic
Oil
Change
7-24

Periodic
Low
Band Adjustment
7-24

Manual
Shift Linkage Check
and
Adjust
7-24

Floor
Shift Linkage
7-25

Floor
Mounted Control Lever
and

Bracket
Assembly
7-29

Throttle
Valve Linkage
.... 7-29

Neutral
Safety Switch
.. . 7-30

Throttle
Return Check Valve (Dashpot)
7-30

Component
Parts Replacement
7-30

Transmission
Replacement .............. 7—30
Page

Other
Service Operations
7-32

Diagnosis
7-32

Warming
Up
Transmission
7-32

Shop
Warm
Up , 7-32

Road
Warm
Up 7-32

Checking
Fluid Level
and
Condition
7-32

Manual
Linkage
7-32

Oil
Leaks
7-33

Basic
Pressure Checks
7-33

Wide
Open Throttle Upshift Pressure Check
.... 7-33

Idle
Pressure
in
Drive Range
7-33

Manual
"Low"
Range Pressure Check .......
7-33

Drive
Range Overrun (Coast) Pressure
.
.......
7-33

Powerglide
Shift Points
. . 7-35

GENERAL DESCRIPTION

The case
and
converter housing
of the two
speed alumi-

num Powerglide Transmission
is a
single case aluminum

unit. When
the
manual control
is
placed
in the
drive
po-

sition,
the
transmission automatically shifts
to low
gear

for initial vehicle movement.
As the car
gains speed
and

depending
on
load
and
throttle position,
an
automatic shift

is made
to
high gear.
A
forced downshift feature
pro-

vides
a
passing gear
by
returning
the
transmission
to low

range.

The
oil
pump assembly
is a
conventional gear type
and

the
oil
pump housing
is of the
large diameter type acting

as
the
front bulkhead
of the
transmission.
The
torque

converter
is a
conventional three element welded design

bolted
to the
engine flywheel which drives through
a
two-

speed planetary gearset.
The
high clutch assembly
is

typical
of the
designs used
in
this type transmission.
The

aluminum Powerglide uses
an
output shaft mounted
gov-
ernor which requires
a
hole through
the
output shaft.
The

reverse clutch assembly
is a
multiple disc type clutch.

The steel plates
are
splined directly
to the
case while
the

face plates
are
splined
to the
internal
or
ring gear.
The

clutch piston operates within
the
rear portion
of the
case.

The internal diameter
of the
pistoh
is
sealed to
an
integral

hub portion
of the
case rear bulkhead.
The
outside
dia-

meter
is
sealed
to a
machined portion
of the
case.
The

piston
is
hydraulically applied
and is
released
by
separate

coil springs.
The
valve body assembly
is
bolted
to the

bottom
of the
transmission case
and is
accessible
for

service
by
removing
the oil pan
assembly.
The
valve

body consists
of an
upper
and
lower body located
on
either

side
of a
transfer plate.
The
vacuum modulator
is lo-

cated
on the
left rear face
of the
transmission case.
The

modulator valve bore
is
located
in the
upper valve body.

MAINTENANCE
AND
ADJUSTMENTS

OIL LEVEL CHECK

The transmission
oil
level should
be
checked period-

ically
as
recommended
in
Section
0. Oil
should
be
added

only when level
is on or
below
the
"ADD" mark
on the dip

stick with
oil hot or at
operating temperature.
The oil

level
dip
stick
is
located
at the
right rear
of the
engine
compartment. Fill with
oil
specified
in
Section
0.

In order
to
check
oil
level accurately,
the
engine should

be idled with
the
transmission
oil hot and the
control

lever
in
neutral (N) position.

It
is
important that
the oil
level
be
maintained
no

higher than
the
"FULL" mark
on the
transmission
oil

level gauge.
DO NOT
OVERFILL,
for
when
the oil
level

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-24

is at the full mark on the dip stick, it is just slightly be-

low the planetary gear unit. If additional oil is added,

bringing the oil level above the full mark, the planetary

unit will run in the oil, foaming and aerating the oil. This

aerated oil carried through the various oil pressure pas-

sages (low servo, reverse servo, clutch apply, converter,

etc.) may cause malfunction of the transmission assem-

bly, resulting in cavitation noise in the converter and

improper band or clutch application. Overheating may

also occur.

If the transmission is found consistently low on oil, a

thorough inspection should be made to find and correct

all external oil leaks.

PERIODIC OIL CHANGE

The transmission oil should be changed periodically as

recommended in Section 0, and whenever transmission is

to be removed from the vehicle for repairs.

1.
Run engine for one minute in neutral prior to chang-

ing.

2.
Be sure vehicle is level or raise from the rear only.

3.
Remove the oil pan drain plug and allow oil to drain

thoroughly into a pan or can.

Replace drain plug and refill with approximately two

quarts of oil specified in Section 0.

NOTE: To refill the transmission, remove dip

stick from oil filler tube and refill transmission

with oil specified in Section 0 using filler tube

and funnel J-4264. Then, after shifting into all

ranges at idle speed to fill all oil passages, the

engine should be run at 800-1000 rpm with the

transmission in Neutral until the oil warms up,

then add oil as required to raise the fluid level

to the full mark on the dip stick. Refill capacity

is approximately 2 qts.
4.

Fig.
1PG - Adjusting Low Band Using J-21848
PERIODIC LOW BAND ADJUSTMENT (Fig. 1PG)

Low band adjustment should be periodically performed

at 12,000 mile intervals, or sooner, as necessary if op-

erating performance indicates low band slippage.

1.
Raise vehicle and place selector lever in neutral.

2.
Remove protective cap from transmission adjusting

screw.

3.
a. On Corvette Models: Drop left exhaust pipe for

clearance.

b.
On Chevelle Models: To gain clearance between

underbody and transmission, it may be necessary

to remove rear mount bolts from crossmember,

and move transmission slightly toward passenger

side of vehicle. .

4.
Loosen adjusting screw lock nut 1/4 turn and hold in

this position with wrench.

5.
Using Special Tool J-21848 adjust band to 70 in. lbs.

and back off four (4) complete turns for a band which

has been in operation for 6,000 miles or more,.or

three (3) turns for one in use less than 6,000 miles.

CAUTION: Be sure to hold the adjusting screw

lock nut at 1/4 turn loose with a wrench during"

the.adjusting procedure.

6. Tighten the adjusting screw lock nut to specified

torque.

CAUTION: The amount of back-off is not an

approximate figure, it must be exact.

MANUAL SHIFT LINKAGE CHECK & ADJUST

(Column Type)

1.
The shift tube and lever assembly must be free in the

mast jacket. See Section 9 for alignment of steering

column assembly if necessary.

2.
To check for proper shift linkage adjustment, lift

the transmission selector lever towards the steering

wheel. Allow the selector lever to be positioned in

drive (D) by the transmission detent.

NOTE: Do not use the indicator pointer as a

reference to position the selected lever. When

performing linkage adjustment, pointer is ad-

justed last.

3.
Release the selector lever. The lever should be in-

hibited from engaging low range unless the lever is

lifted.

4.
Lift the selector lever towards the steering wheel,

and allow the lever to be positioned in neutral (N) by

the transmission detent.

5.
Release the selector lever. The lever should now

be inhibited from engaging reverse range unless the

lever is lifted.

6. A properly adjusted linkage will prevent the selector

lever from moving beyond both the neutral detent, and

the drive detent unless the lever is lifted to pass

over the mechanical stop in the steering column.

7.
In the event that an adjustment is required, place

the selector lever in drive (D) position as determined

by the transmission detent. See Steps 2 and 3.

8. Loosen the adjustment swivel at the cross-shaft,

and rotate the transmission lever so that it contacts

the drive stop in the steering column.

9. Tighten the swivel and recheck the adjustment. See

2 and 6.

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-25

Fig.
2PG - Chevrolet Shift Linkage Adjustments

10.

11.
Readjust indicator needle if necessary to agree with

the transmission detent positions. See Section 9.

Readjust neutral safety switch if necessary to pro-

vide the correct relationship to the transmission

detent positions. See Section 12.

CAUTION: Any inaccuracies in the above ad-

justment may result in premature failure of the

transmission due to operation without controls

in full detent. Such operation results in reduced

oil pressure and in turn partial engagement of

the affected clutches. Partial
of the

clutches with sufficient pressure to cause ap-

parent normal operation of the vehicle will

result in failure of the clutches or other in-

ternal parts after only a few miles of operation.

Floor Shift Linkage

Chevrolet Linkage Adjustment (Fig. 6PG)

1.
Loosely assemble Nuts (A) and (B) on Lower Rod (C).

2.
Set Transmission Lever (D) in drive position.
NOTE:
Obtain drive position by moving Trans-

mission Lever counter-clockwise to low detent,

then clockwise one detent position to drive.

3.
Set Control Pawl Lever Rod (E) in Neutral or drive

notch of Detent (F). See View A.

4.
Apply load in direction of Arrow (Y) on Actuating

Lever (G) until pawl Rod comes in contact with

Detent at Contact Point (Z). See View A.

5. Place a 7/64" Spacer (H) between Nut (A) and Swivel

(J),
run Nut (A) until it touches spacer. Remove

Spacer and apply load in the direction on Arrow (X)

until it touches Nut (A). Tighten Nut (B) against

Swivel and lock Swivel between Nuts (A) and (B).

See View B.

Chevelle Linkage Adjustment (Fig. 7PG)

1.
Assemble Nuts (A) and (B) on Lower Rod (C) loosely.

2.
Set Transmission Lever (D) in drive position.

NOTE:
Obrain drive position by moving Trans-

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-32

21.
Remove transmission output shaft slip yoke and in-

sert a plastic shipping plug in end of extension to

prevent spillage of transmission fluid.

NOTE:
The yoke is removed to avoid tearing

the heat reflecting pad on the underbbdy, when

the transmission is being removed.

22.
Remove bright metal ignition shielding from dis-

tributor area.

23.
Remove the transmission dip stick and tube

assembly.

24.
Disconnect transmission vacuum modulator line at

distributor advance line tee.

25.
Position transmission hoist under transmission and

attach safety chain to transmission.

26.
Remove transmission converter housing-to-engine

attaching foolts and slide transmission rearward.
NOTE:
Observe converter when moving trans-

mission rearward. If converter does not move

with the transmission, pry it free of flywheel

before proceeding.

27.
Install converter retaining strap.

28.
Lower and remove transmission from vehicle by

tilting the front down and to the right while inter-

mittently lowering the transmission to facilitate its

• removal.

29.
Reinstall transmission assembly by performing the

above steps in reverse order.

Bolt Torques

Transmission Case to Flywheel

Housing Bolts 35 ft. lbs.

Converter to Flywheel Bolts. . , . . 35 ft. lbs.

OTHER SERVICE OPERATIONS

Although certain operations, such as oil pan or gasket

replacement, valve body, governor, filler pipe "O" ring,

speedometer drive gear, case extension "0" ring and

rear oil seal, vacuum modulator, and servo cover or

gasket service may be performed from underneath the
vehicle without removing the Powerglide; their service

procedure is covered in the Passenger Overhaul Manual

and is not repeated here. Refer to the- Powerglide Sec-

tion of the Passenger Overhaul Manual for all other

service operations not covered here.

DIAGNOSIS

Proper operation of the Powerglide transmission may

be affected by a number of factors, all of which must be

considered when trouble in the unit is diagnosed.

Proper trouble diagnosis can only be accomplished

when performed in a thorough step by step procedure.

The following procedure has been devised and tested and

is recommended for all trouble diagnosis complaints and

if the service man will follow this checking procedure,

accurate and dependable diagnosis may be accomplished.

This will result in a savings of time, not only to the

service man, but to the customer as well.

WARMING UP TRANSMISSION

Before attempting to check and/or correct any com-

plaints on the Powerglide transmission it is absolutely

essential that the oil level be checked and corrected if

necessary. An oil level which is either too high or too

low can be the cause of a number of abnormal conditions

from excessive noise to slippage in all ranges.

It must be remembered that cold oil will slow up the

action of the hydraulic controls in the transmission. For

this reason a trouble or oil leak diagnosis should not be

attempted until the transmission has been warmed up by

either of the following procedures:

Shop Warm Up

1.
Connect tachometer to engine.

2.
Set parking brake tight and start engine.

3.
Place selector light in
"D"
(drive) range.

4.
Adjust carburetor idle speed adjusting screw to run

engine at approximately 750 rpm and operate in this

manner for two minutes. At the end of two minutes

of operation, the transmission will be sufficiently

warmed up for diagnosis purposes.
NOTE:
At this point, readjust the engine idle

speed to 450-475 rpm in
"D"
range.

Road Warm Up

Drive the car approximately 5 miles with frequent

starts and stops.

NOTE:
At this point, make sure the engine idle

speed is set to 450-475 rpm in
"D"
range.

CHECKING FLUID LEVEL AND CONDITION

After transmission has been warmed up, check the

fluid level with the engine idling, parking brake set and

control lever in "N" (neutral). If the fluid level is low,

add fluid to bring level up to the full mark on gauge rod,

CAUTION: If fluid level is too high, fluid may

be aerated by the planet carrier. Aerated fluid

will cause turbulence in the converter which will

result in lost power, lower stall speed and lower

pressures in control circuits. Lower fluid level

to full mark, then shut off engine to allow air

bubbles to work out of fluid.

When checking oil level, aburned smell and discolora-

tion indicate burned clutches or bands and the transmis-

sion will have to be removed.

MANUAL LINKAGE

Manual linkage adjustment and the associated neutral

safety switch are important from a safety standpoint.

The neutral safety switch should be adjusted so that the

engine will start in the Park and Neutral positions only.

With the selector lever in the Park position, the park-

ing pawl should freely engage and prevent the vehicle

CHEVROLET CHASSIS SERVICE MANUAL