1967 CHEVROLET CAMARO Chassis Workshop Manual

seats reset brake pads recommended oil oil change wheel

Page 393 of 659

CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
CLUTCH AND TRANSMISSIONS 7-34

3.
Pressure regulator valve stuck.

4.
Leak at valve body to case gasket.

5.
Leak between valve body gaskets,.

6. Leak at servo center.

7.
Front pump clearances.

Page 394 of 659

CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
1967
SHIFT POINTS-POWERGLIDE

Chevrolet Models
(MPH)

Engine

Throttle

Position

Closed

"DefcenT

Touch

Full

Detent
L250 (Base)

3.36 Axle - 8.25

14 Tire

Up

13.5-16.8

40.8-50.0

49.5-56.9

1967
SHIFT POINTS-POWERGLIDE

Chevrolet Models
(MPH)

Engine

Throttle

Position

Closed

"DefcenT

Touch

Full

Detent
L250 (Base)

3.36 Axle - 8.25

14 Tire

Up

13.5-16.8

40.8-50.0

49.5-56.9
Down

12.3-15.B

22.4-34.2

45.8-53.6
L250 (Base) Taxi

3.07 Axle- 8.15

15 Tire

Up

15.1-18.8

45.9-57.2

55.6-63.9
Down

13.8-17.7

24.7-38.0

51.2-60.0
L250 (Base) Police

3.31 Axle - 8.25

14 Tire

Up

13.7-17.0

41.5-51.7

50.2-57.7
Down

12.5-16.0

22.3-34.3

46.2-54.2
V283 (Base)

3.36 Axle - 8.25

14 Tire

Up

13.5-16.7

43.7-53.2

52.5-59.4
Down

12.4-15.8

15.3-23.1

49.2-56,5
V327 (L30)

3.08 Axle - 8.25

14 Tire

Up

15.0-18.5

53.8-65.1

65.8-73.5
Down

13.7-17.4

16.9-27.9

61.5-69.7
V327 (L30/K19)

3.08 Axle - 8.25

14 Tire

Up

15.0-18.5

53.8-65.1

65.8-73.5
Down

13.8-17.6

17.1-28.4

61.7-69.9
V396 (L35)

3.07 Axle - 8.25

14 Tire

Up .

15.1-18.6

54.0-65.3

66.0-73.8
Down

13.8-17.5

17.0-28.0

61.7-69.9

Chevelle Models (MPH)

Engine

Throttle

Position

Closed

"UHenf"

Touch

Full

Detent
L230 (L26)

3.08 Axle - 7.35

14 Tire

Up

14.0-17.4

42.3-52.8

51.3-59.0
Down

12.8-16.4

22.8-35.0

47.2-55.3
L250 (L22)

3.08 Axle- 7.35

14 Tire

Up

14.0-17.4

42.3-52.8

51.3-59.0
Down

12.8-16.4

23.3-35.4

47.5-55.6
V283 (Base)

3.08 Axle - 7.35

14 Tire

Up

14.0-17.4

45.3-55.2

54.4-61.5
Down

12.8-16.3

15.8-23.9

51.0-58.5
V327 (L30)

3.08 Axle - 7.35

14 Tire

Up

14.3-17.6

51.1-61.9

62.5-69.9
Down

13.0-16.6

16.1-26.5

58.5-66.2
V327 (L30/K19)

3.08 Axle - 7.35

14 Tire

Up

14.3-17.6

51.1-61.9

62.5-69.9
Down

13.2-16.7

16.2-27.0

58.7-66.4
V396 (L34)

3.31 Axle - F70

14 Tire

Up

13.9-17.1

56.7-68.8

70.7-78.5
Down

12.7-16.1

15.7-21.6

65.8-74.1
V396 (L35)

3.07 Axle - F70

14 Tire

Up

14.8-18.3

55.3-67.4

68.9-76.9
Down

13.5-17.2

16.7-20.8

64.1-72.6

Chevy II Models (MPH)

Engine

Throttle

Position

Closed

Detent

Touch

Full

Detent
L194 (Base) M35

3.08 Axle - 6.95

14 Tire

Up

13.1-16.9

39.8-49.8

48.2-55.6
Down

12.4-15.9

22.6-33.9

44.7-52.4
L194 (Base) C60

3.36 Axle - 6.95

14 Tire,

Up

12.4-15.5

36.5-45.6

44.2-51.0
Down

11.4-14.6

20.8-31.1

41.0-48.1
L250 (L22)

3.08 Axle - 6.95

14 Tire

Up

13.7-17.0

41.4-51.6

50.2-57.7
Down

12.5-16.0

22.8-34.7

46.4-54.4
V283 (Base)

Chevy II

3.08 Axle- 6.95

14 Tire

Up

13.8-17.1

46.1-56.0

55.3-62.5
Down

12.6-16.1

15.6-24.3

51.9-59.4
V283 (Base)

Super Sport

3.08 Axle - 6.95

14 Tire

Up

13.7-17.0

44.3-54.0

53.2-60.2
Down

12.5-16.0

15.5-23.4

49.9-57.3
V327 (L30)

3.08 Axle - 6.95

14 Tire

Up

14.0-17.2

50.0-60.5

61.1-68.3
Down

12.8-16.2

15.7-25.9

57.2-64.8
V327 (L3O/K19)

3.08 Axle - 6.95

14 Tire

Up ,

14.0-17.2

50.0-60.5

61.1-68.3
Down

12.9-16.3

15.9-26.4

57.4-65.0

Corvette Models
(MPH)
Comoro Models
(MPH)

Engine

Throttle

Position

Closed

Detent

Touch

Full

Detent
V327 (Hi. Perf.)

3.3*6
Axle - -7.75

15 Tire

Up

13.8-17.0

49.3-59.7

60.3-67.4
Down

12.6-16.0

15.5-25.5

56.4-63.9
V427 (L36)

3.36 Axle - 7.75

15 Tire

Up

13.8-17.0

55.7-66.9

68.1-75.6
Down

12.6-16.0

15.5-28.5

63.7-71.6
L230 (L26)

(M35
&
D55)

2.72 Axle - 7.35

14 Tire

Up

15.8-19.6

47.8-59.5

57.9-66.5
Down

14.4-18.5

25.7-39.5

53.2-62.4
L250 (L22)

(M35
&
D55)

2.73 Axle - 7.35

14 Tire

Up

15.8-19.6

47.8-59.5

57.9-66.9
Down

14.4-18.5

26.2-40.0

55.5-62.3
V327 (M35
&
D55)

2.73 Axle - 7.35

14 Tire

Up

16.1-19.9

57.7-69.8

70.5-78.8
Down

14.7-18.7

18.2-29.9

66.0-74.1
V327 (K19)

(M35
&
D55)

2.73 Axle - 7.35

14 Tire

Up

16.1-19.9

57.7-69.8

70.5-78.8
Down

14.8-18.8

18.3-30.4

66.7-74.9
V327 (Base) 28RL

2.73 Axle - 7.35

14 Tire

Up

16.9-18.3

56.7-63.4

68.4-71.9
Down

15.6-17.2

34.4-42.9

64.8-68.6

Page 395 of 659

CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
CLUTCH AND TRANSMISSIONS 7-36

TURBO HYDRA-MATIC TRANSMISSION

INDEX

Page

General Description . . , . 7-36

Maintenance and Adjustments . 7-37

Transmission Fluid 7-37

Fluid Level Indicator 7-37

CLUTCH AND TRANSMISSIONS 7-36

TURBO HYDRA-MATIC TRANSMISSION

INDEX

Page

General Description . . , . 7-36

Maintenance and Adjustments . 7-37

Transmission Fluid 7-37

Fluid Level Indicator 7-37

Shift Control Linkage Adjustment ........... 7-37

Neutral Safety Switch Adjustment 7-37

Draining and Refilling Transmission . . . 7-37

Pressure Regulator Valve 7-38

Control Valve Body . 7-39

Governor ..'.... 7-40

Modulator and Modulator Valve 7-40

Parking Linkage . . 7-40
Page

Rear Seal -. 7-40

Other Service Operations . . 7-40

Transmission Replacement 7-40

Turbo Hydra-Matic Diagnosis Procedure. ......... 7-41

Sequence . ; ; 7-41

Oil Level and Condition Check 7-41

Manual Linkage 7-41

Oil Leaks .' 7-41

Case Porosity - Repair ................ 7-42

Oil Pressure Check 7-42

Transmission Shift Points 7-42

Special Tools 7-43

GENERAL DESCRIPTION

The Turbo Hydra-Matic transmission is a fully auto-

matic unit consisting primarily of a 3-element hydraulic

torque converter and a compound planetary gear set.

Three multiple-disc clutches, one sprag unit, one roller

clutch and two bands provide the friction elements re-

quired to obtain the desired function of the compound

planetary gear set.

The torque converter couples the engine to the plane-

tary gears through oil and provides hydraulic torque

multiplication when required. The compound planetary

gear set produces three forward speeds and reverse.

The
3-
element torque converter consists of a pump or

driving member, a turbine or driven member, and a

stator assembly. The stator is mounted on a one-way

roller clutch which will allow the stator to turn clock-

wise but not counter-clockwise.

The torque converter housing is filled with oil and

is attached to the engine crankshaft by a flex plate and

always rotates at engine speed. The converter pump is

an integral part of the converter housing, therefore the

pump blades, rotating at engine speed, set the oil within

the converter into motion and direct it to the turbine,

causing the turbine to rotate.

As the oil passes through the turbine it is traveling in

such a direction that if it were not re-directed by the

stator it would hit the rear of the converter pump blades

and impede its pumping action. So at low turbine speeds,

the oil is re-directed by the stator to the converter pump

in such a manner that it actually assists the converter

pump to deliver power or multiply engine torque.

As turbine speed increases, the direction of the oil

leaving the turbine changes and flows against the rear

side of the stator vanes in a clockwise direction. Since

the stator is now impeding the smooth flow of oil, its

roller clutch releases and it revolves freely on its shaft.

Once the stator becomes inactive, there is no further

multiplication of engine torque within the converter. At

this point, the converter is merely acting as a fluid

coupling as both the converter pump and turbine are

being driven at approximately the same speed - or at a

one-to-one ratio.

A hydraulic system pressurized by a gear type pump

provides the working pressure required to operate the

friction elements and automatic controls.

External control connections to transmission are:
Manual Linkage

Engine Vacuum

12 Volt Electrical

Signal
To select the desired op-

erating range.

To operate a vacuum mod-

ulator unit.

To operate an electrical

detent solenoid.

A vacuum modulator is used to automatically sense

any change in the torque input to the transmission. The

vacuum, modulator transmits this signal to the pressure

regulator for line pressure control, to the 1-2 accumula-

tor valve, and to the shift valves so that all torque re-

quirements of the transmission are met and smooth

shifts are obtained at all throttle openings.

The detent solenoid is activated by an alectric switch

on the carburetor. When the throttle is fully opened, the

switch on the carburetor is closed, activating the detent

solenoid and. causing the transmission to downshift at

speeds below approximately 70 MPH.

The selector quadrant has six selector positions: P,R,

N,D,
L2,L1.

P.
*
- Park position positively locks the output shaft to

the transmission case by means of a locking pawl

to prevent the vehicle from rolling in either di-

rection. The engine may be started in Park

position.

R. - Reverse enables the vehicle to be operated in a

reverse direction.

N.
- Neutral position enables the engine to be started

and run without driving the vehicle.

D,
- Drive Range is used for all normal driving condi-

tions and maximum economy. Drive Range has

three gear ratios, from the starting ratio to

direct drive. Detent downshifts are available by

depressing the accelerator to the floor.

L2.
- L2 Range has the same starting ratio as Drive

Range, but prevents the transmission from shift-

ing above second speed to retain second speed

acceleration when extra performance is desired.

L2 Range can also be used for engine braking.

L2 Range can be selected at any vehicle speed,

and the transmission will shift to second gear and

remain in second until the vehicle speed or the

throttle are changed to obtain first gear operation

in the same manner as in D Range.

CHIVROLET CHASSIS SERVICE MANUAL

Page 396 of 659

CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
CLUTCH AND TRANSMISSIONS 7-37

LI.
- LI Range can be selected at any vehicle speed,

and the transmission will shift to second gear

and remain in second until vehicle speed is re-

duced to approxi

CLUTCH AND TRANSMISSIONS 7-37

LI.
- LI Range can be selected at any vehicle speed,

and the transmission will shift to second gear

and remain in second until vehicle speed is re-

duced to approximately 40 MPH, .depending on

axle ratio. LI Range position prevents the trans-

mission from shifting out of first gear.
It is very important that any communication concerning

the Turbo Hydra-Matic always contain the transmission

serial number and that all transmission parts returned

to Chevrolet Motor Division always be tagged with the

transmission serial number.

MAINTENANCE AND ADJUSTMENTS

TRANSMISSION FLUID

Transmission fluid level should be checked with trans-

mission warm and selector lever in "P" Park position,

every time engine oil level is checked or as specified in

Section 0 when engine oil is changed.

CAUTION: Since the Turbo Hydra-Matic trans-

mission is very sensitive to oil level, special

precautions should be taken when checking the

oil level, to insure against an overfifE

Transmission fluid should be changed as specified in

Section 0.

FLUID LEVEL INDICATOR

The fluid level indicator is located in the filler pipe at

the right rear corner of the engine. To bring the fluid

level from the add mark to the full mark add 1 pint.

Fluid level should be to the full mark with transmission

at normal operating temperature. With cold fluid the

level should be at the add mark or slightly below.

SHIFT CONTROL LINKAGE ADJUSTMENT

Adjust linkage as shown below and in Figure 2.

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 selector 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.

See schematic diagram.

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

Steps 2 and 6. -

l(h Readjust indicator needle if necessary to agree with

the transmission detent" positions. See Section 9.

11.
Readjust neutral safety switch if necessary to pro-

vide the correct relationship to the transmission de-

tent positions. See Section 12.

12.
When properly adjusted the following conditions must

be met by manual operation of the steering column

shift lever:

a. From reverse to drive position travel, the trans-

mission detent feel must be noted and related to

indicated position on dial.

b.
When in drive and reverse positions, pull lever

rearward (towards steering wheel) and then re-

lease. It must drop back into position with no

restrictions.

NEUTRAL SAFETY SWITCH ADJUSTMENT

The neutral safety switch must be adjusted so that the

car will start in the park or neutral position, but will not

start in the other positions. For replacement refer to

Section 12 of this Manual.

DRAINING AND REFILLING TRANSMISSION

Drain oil immediately after operation before it has had

an opportunity to cool.

To drain oil proceed as follows:

1.
Remove bottom pan attaching screws, pan, and gas-

ket.

2.
Remove oil strainer. Remove "O" ring seal from

pick-up pipe and discard.

3.
Discard strainer if dirty.

4.
Install new "O" ring seal on pick-up pipe and install

strainer and pipe assembly.

5.
Thoroughly clean bottom pan.

6.. Affix new gasket to bottom pan with petroleum jelly.

7.
Install bottom pan with attaching screws and torque

to specifications;

8. If only the pan has been removed, pour approximately

7-1/2 pints of fluid into the transmission. If the

valve body has also been removed use 9-1/2 pints.

After a complete overhaul approximately 19 pints

are required. Be sure container, spout, or funnel is

clean.

9. Start engine and let idle (carburetor off fast idle

step).
Place selector lever in P position and apply

hand brake.

10.
With transmission warm (approximately 150°F), add

fluid to bring level to full mark on indicator.

CAUTION: Do not overfill. Foaming will re-

sult.

CHEVROLET CHASSIS SERVICE MANUAL

Page 397 of 659

CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
CLUTCH AND TRANSMISSIONS 7-38

Fig.
IT - Gearshift- Controls (column) - Typical

PRESSURE REGULATOR VALVE

Removal

1.
Remove bottom pan and Strainer.

2.
Compress regulator boost valve bushing ag

Page 398 of 659

CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
CLUTCH AND TRANSMISSIONS 7-39

LINKAGE ADJUSTMENT

1.
Set lever (D) & control lever (E) in "Drive" detent.

2.
Apply Forward load (Y) on lever (G) to Fully

seat lever (E) in "Drive".

3. Place a %

Page 399 of 659

CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
CLUTCH AND TRANSMISSIONS 7-40

pipes.
If
care
is
taken
in
removing control valve

body
the six (6)
check balls will stay
in
place above

the spacer plate.

CAUTION:
Do not
drop manual val

CLUTCH AND TRANSMISSIONS 7-40

pipes.
If
care
is
taken
in
removing control valve

body
the six (6)
check balls will stay
in
place above

the spacer plate.

CAUTION:
Do not
drop manual valve.

5. Remove
the
governor pipes
and
manual valve from

control valve body.

Installation

Installation
of the
control valve body
is the
reverse
of

the removal.

GOVERNOR

Removal
.

1.
Remove governor cover attaching screws, cover,
and

gasket.

2.
Discard gasket.

3.
Withdraw governor assembly from case.

Installation

Installation
of the
governor assembly
is the
reverse
of

the removal.
Use a new
gasket under
the
governor

cover.

MODULATOR AND MODULATOR VALVE

Removal

1.
Remove modulator assembly attaching screw
and

retainer.

2.
Remove modulator assembly from case. Discard

"O"
ring seal.

3.
Remove modulator valve from case.

Installation

Installation
of the
modulator assembly
and
modulator

valve
is the
reverse
of the
removal.
Use a new
"O" ring

seal
on the
modulator assembly.
PARKING LINKAGE

Removal

1.
Remove bottom
pan and oil
strainer.

2.
Unthread
jam nut
holding detent lever
to
manual

shaft.

3.
Remove manual shaft retaining
pin
from case.

4.
Remove manual shaft
and jam nut
from case.

NOTE:
DO NOT
remove manual shaft seal
un-

less replacement
is
required.

5. Remove parking actuator
rod and
detent lever
as-

sembly.

6. Remove parking pawl bracket attaching screws
and

bracket.

7. Remove parking pawl return spring.

NOTE:
The
following steps should
not be com-

pleted unless part replacement
is
required.

8. Remove parking pawl shaft retainer.

9.
Remove parking pawl shaft,
cup
plug, parking pawl

shaft, and parking pawl.

Installation

Installation
of the
parking linkage
is the
reverse
of the

removal.
Use new
seal
and cup
plug,
if
removed,
and

new bottom
pan
gasket.

REAR SEAL

Removal

1.
Remove propeller shaft.

2.
Pry
seal
out
with screw driver.

Installation

1.
Using Tool J-5154
or
J-21359 install
new
seal.

2.
Re-install propeller shaft.

OTHER SERVICE WITH TRANSMISSION IN VEHICLE

The following operations when done
as
single opera-

tions
and not as
part
of a
general overhaul should,
as a

practical matter,
be
performed with
the
transmission
in

the.
vehicle. Refer
to the
"Transmission Disassembly

and Reassembly" section
of the
Overhaul Manual
for

service procedures.

a. Oil
filler pipe
and
"O"
ring seal.

b.
Oil pan
and
gasket.

c. Down shift solenoid
or
connector.
d. Valve body spacer plate, gasket
and
check balls.

e. Front accumulator piston.

f.
Rear servo
and
rear accumulator assembly.

g.
Rear band apply checking with Tool J-21370.

Ji.
Front servo assembly.

i. Speedo driven gear.

j.
Case extension
or
gasket.

k.
Strainer
and
"O"
ring.

TRANSMISSION REPLACEMENT

Before raising
the car,
disconnect
the
battery
and re-

lease
the
parking brake.

1.
Remove propeller shaft.
8.

2.
Disconnect speedometer cable, electrical lead to case
9.

connector, vacuum line
at
modulator,
and oil
cooler
10.

pipes.

3.
Disconnect shift control linkage.

4.
Support transmission with suitable transmission jack.
11.

5. Disconnect rear mount from frame crossmember.

6. Remove
two
bolts
at
each
end of
frame crossmember
12.

and remove crossmember.

7. Remove
oil
cooler lines, vacuum modulator line,
speedo cable,
and
detent solenoid connector wire
at

transmission.

Remove converter under
pan.

Remove converter
to
flywheel bolts.

Loosen exhaust pipe
to
manifold bolts approximately

1/4
inch,
and
lower transmission until jack
is
barely

supporting
it.

Remove transmission
to
engine mounting bolts
and

remove
oil
filler tube
at
transmission.

Raise transmission
to its
normal position, support

engine with jack
and
slide transmission rearward

from engine
and
lower
it
away from vehicle.

CHEVROLET CHASSIS SERVICE MANUAL

Page 400 of 659

CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
CLUTCH AND TRANSMISSIONS 7-41

CAUTION: Use converter holding ToolJ-5384

when lowering transmission or keep rear of

transmission lower than front so as not to lose
converter.

The installation of

CLUTCH AND TRANSMISSIONS 7-41

CAUTION: Use converter holding ToolJ-5384

when lowering transmission or keep rear of

transmission lower than front so as not to lose
converter.

The installation of the transmission is the reverse of

the removal.

TURBO HYDRA-MATIC DIAGNOSIS PROCEDURE

Accurate diagnosis of transmission problems begins

with a thorough understanding of normal transmission

operation. In particular, knowing which units are in-

volved in the various speeds or shifts so that the specific

units or circuits involved in the problem can be isolated

and investigated further. Analytical diagnosis will pro-

tect the technician from come backs and certainly will

improve owner satisfaction.

An important and often overlooked aspect of diagnosis

is finding out specifically what the customer is com-

plaining of. For this purpose a short ride with the cus-

tomer will often prove beneficial. It may be found that

the condition the customer wants corrected is standard

and should not be altered.

The following sequence, based on field experience, pro-

vides the desired information quickly and in most cases

actually corrects the malfunction without requiring the

removal of the transmission. Details of the items listed

in this sequence are covered further in the text.

SEQUENCE FOR TURBO HYDRA-MATIC

DIAGNOSIS PROCEDURE

1.
Check oil level and condition.

2.
Check and correct detent switch.

3.
Check and correct vacuum line and fittings.

4.
Check and correct manual linkage.

OIL LEVEL AND CONDITION CHECK

Always check the oil level before road testing. Oil

must be visible on dip stick prior to operating the ve-

hicle. Erratic shifting, pump noise, or other malfunc-

tions can in some cases be traced to improper oil level.

Oil level should be checked with the selector lever in

the Park (P) position, engine running, and the vehicle on

level pavement.

Fluid level should be to the FULL mark with the trans-

mission at normal operating temperature (170°-190°
F.).

With warm fluid (room temperature), the level should be

at or slightly below the ADD mark.

If oil level was low, refer to Oil Leaks.

The condition of the oil is often an indication of whether

the transmission should be removed from the vehicle, or

to make further tests. When checking oil level, a burned

smell and discoloration indicate burned clutches or bands

and the transmission 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

from rolling. The pointer on the indicator quadrant

should line up properly with the range indicators in all

ranges.
OIL LEAKS

Before attempting to correct an oil leak, the actual

source of the leak must be determined. In many cases,

the source of the leak can be deceiving due to "wind flow"

around the engine and transmission.

The suspected area should be wiped clean of all oil be-

fore inspecting for the source of the leak. Red dye is

used in the transmission oil at the assembly plant and

will indicate if the oil leak is from the transmission.

. The use of a "black light"* to identify the oil at the

source of leak is also helpful. Comparing the oil from

the leak to that on the engine or transmission dip stick

(when viewed by black light) will determine the source

of the leak.

Oil leaks around the engine and transmission are gen-

erally carried toward the rear of the car by the air

stream. For example, a transmission "oil filler tube to

case leak" will sometimes appear as a leak at the rear of

the transmission. In determining the source of an oil

leak it is most helpful to keep the engine running.

POSSIBLE POINTS OF OIL LEAKS

• 1. TRANSMISSION OIL PAN LEAK

a. Attaching bolts not correctly torqued.

b.
Improperly installed or damaged pan gasket.

c. Oil pan gasket mounting face not flat.

2.
REAR EXTENSION LEAK

a. Attaching bolts not correctly torqued.

b.
Rear seal assembly — damaged or improperly

installed.

c. Gasket seal — (extension to case) damaged or

improperly installed.

d. Porous casting.

3.
CASE LEAK

a. Filler pipe "O" ring seal damaged or missing;

misposition of filler pipe bracket to engine —

"loading" one side of
"O"
ring.

b.
Modulator assembly "O" ring seal
—
damaged or

improperly installed.

c. Governor cover, gasket and bolts — damaged,

loose; case face leak.

d. Speedo gear
—
"O" ring damaged.

e. Manual shaft seal — damaged, improperly in-

stalled.

f. line pressure tap plug — stripped, shy sealer

compound.

g. Parking pawl shaft cup plug
—
damaged, improp-

erly installed.

h. Vent pipe (refer to Item 5).

i. Porous case.

4.
FRONT END LEAK

a. Front seal - damaged (check converter neck for

nicks,
etc., also for pump bushing moved for-

ward);
garter spring missing from pump to con-

verter seaL

b.
Pump attaching bolts and seals
—
damaged, miss-

ing, bolts loose.

CHEVROLET a
SERVICE

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