automatic transmission fluid CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
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Page 15 of 659
LUBRICATION 0-13
LUBRICATION
INDEX
Page
Engine Crankcase Oil . 0-13
Crankcase Capacities. . 0-13
Lubrication . ,
•
o-13
SAE Viscosity Oils 0-13
Types of Oils 0-14
Maintaining Oil Level 0-14
Oil and Filter Change Intervals 0-14
Oil.
. . ...:.. 0-14
Filter o-14
Crankcase Dilution . 0-14
Automatic Control Devices to Minimize
Crankcase Dilution 0-14
Crankcase Breather Cap 0-14
Crankcase Ventilation System 0-15
Valve Type 0-15
Fuel Filter 0-15
Air Cleaner . 0-15
Polyurethane Type 0-15
Oil Wetted Paper Element Type 0-15
Battery Terminal Washers 0-15
Page
Distributor 0-15
Rear Axle and 3-Speed and Overdrive
4-Speed Transmission 0-15
Recommended Lubricants 0-15
Multi-Purpose Gear Lubricants 0-15
Lubricant Additions 0-15
Lubricant Changes 0-15
Powerglide Transmission 0-15
Turbo Hydra-Matic 0-16
Front Wheel Bearings 0-16
Manual Steering Gear . . . . 0-16
Power Steering 0-16
Air Conditioning 0-16
Brake Master Cylinder. 0-16
Parking Brake 0-16
Clutch Cross-Shaft , 0-16
Chassis Lubrication 0-16
Lubrication Diagrams . . 0-19
Body Lubrication (Chevrolet, Chevelle, Chevy n, Camaro). 0-20
Body Lubrication Points (Corvette) . 0-21
The selection of the proper lubricant and its correct
application at regular intervals does much to increase the
life and operation of all moving parts of the vehicle.
Consequently, it is important that the correct grade of
oil or grease, as noted in the following pages, be used.
ENGINE CRANKCASE OIL
Crankcase Capacity
4 Cylinder 4 qt.
6 Cylinder 4 qt.
8 Cylinder (283) 4 qt.
8 Cylinder (327) 4 qt.
8 Cylinder (350) 4 qt.
8 Cylinder (396) 4 qt.
8 Cylinder (427) Chevrolet 4 qt.
8 Cylinder (427) Corvette 5 qt.
For 4 Cyl. Add .5 qt. with filter change;
1 qt. for 6 and 8 Cyl. engines.
Lubrication
Crankcase oil should be selected to give the best per-
formance under the climatic and driving conditions in the
territory in which the vehicle is driven.
During warm or hot weather, an oil which will provide
adequate lubrication under high operating temperatures
is required.
During the colder months of the year* an oil which will
permit easy starting at the lowest atmospheric tempera-
ture likely to be encountered, should be used.
When the crankcase is drained and refilled, the crank-
case oil should be selected, not on the basis of the exist-
ing temperature at the time of the change, but on the
lowest temperature anticipated for the period during
which the oil is to be used.
Unless the crankcase oil is selected on the basis of
viscosity or fluidity of the anticipated temperature, dif-
ficulty in starting will be experienced at each sudden
drop in temperature.
SAE Viscosity Oils
SAE Viscosity Numbers indicate only the viscosity or
body of the oil, that is, whether an oil is a light or a
heavy body oil, and do not consider or include other
properties or quality factors.
The lower SAE Viscosity Numbers, such as SAE 5W
and SAE 10W which represent the light body oils, are
recommended for use during cold weather to provide
easy starting and instant lubrication. The higher SAE
Viscosity Numbers such as SAE 20 and SAE 20W, which
represents heavier body oils, are recommended for use
during warm or hot weather to provide improved oil
economy and adequate lubrication under high operating
temperatures.
Oils are available which are designed to combine the
easy starting characteristics of the lower SAE Viscosity
Number with the warm weather operating characteristics
of the higher SAE Viscosity Number. These are termed
"multi-viscosity oils," SAE 5-10W, SAE 5W-20, SAE
10W-20W, and SAE 10W-30.
The following chart will serve as a guide for the
selection of the correct SAE Viscosity Number for use
under different atmospheric temperature ranges, and
suggests the appropriate SAE Viscosity Numbers when
multi-viscosity oils are used.
Lowest Anticipated
Temperature
During Time
Oil Will Be
in Crankcase
32°F.
0°F.
Below 0°F.
Recommended
SAE Viscosity
Oils
SAE 20 or 20W
SAE 10W
SAE 5W
Recommended
SAE
Multi-
Viscosity
Oils
SAE 10W-30 .
SAE 10W-30
SAE 5W-20
SAE 30 or 10W-30 is recommended when most of the
driving is at high speeds and/or at temperatures above
90
°F.
CHEVROLET CHASSIS SERVICE MANUAL
Page 17 of 659
LUBRICATION 0-15
CRANKCASE VENTILATION VALVE
VALVE TYPE
NOTE: Under prolonged dusty driving condi-
tions,
it is recommended that these operations
be performed more often. Every 12,000 miles
or 12 months the valve should be replaced.
Connecting hoses, fittings, flame arrestor and
crankcase breather cap (where used) should be
cleaned. At every oil change the system should
be tested for proper function and serviced, if
necessary.
FUEL FILTER
Replace filter element located in carburetor inlet if
flooding occurs, if engine surges during constant speed
operation (pulsating effect) or if poor performance is
experienced during acceleration or at higher speeds.
AIR CLEANER
NOTE: Under prolonged dusty driving condi-
tions,
it is recommended that these operations
be performed more often.
POLYURETHANE TYPE-
Every 12,000 miles clean element in solvent, squeeze
out solvent, then soak in engine oil and squeeze out
excess.
OIL WETTED PAPER ELEMENT TYPE-
First 12,000 miles inspect or test element; if satis-
factory, re-use element but recheck every 6,000 miles
until replaced. Element must not be washed, oiled,
tapped or cleaned with an air hose.
BATTERY TERMINAL WASHERS
Battery terminals have felt washers between top of
case and cable connections to minimize corrosive action
of battery acid. These felt washers should be saturated
with engine oil every 6,000 miles.
DISTRIBUTOR
4 and 6-Cylinder Engine—Remove distributor cap and
rotate lubricator 1/2 turn at 12,000 mile intervals. Re-
place at 24,000 mile intervals.
8-Cylinder Engine—Change cam lubricator end for end
at 12,000 mile intervals. Replace at 24,000 mile
intervals.
REAR AXLE AND 3-SPEED AND
OVERDRIVE, 4-SPEED TRANSMISSIONS
The passenger car operates under the most severe
lubrication conditions at high speed and requires a hypoid
lubricant which will meet this condition.
Recommended Lubricants
Standard Rear Axles—SAE 90 "Multi-Purpose" gear
lubricant.
Positraction Rear Axles—Use special Positraction
lubricant.
CAUTION: Straight Mineral Oil gear lubricants
must not be used in hypoid rear axles.
Transmissions—SAE 90 "Multi-Purpose" gear
lubricant.
The SAE 90 viscosity grade is recommended for year
round use. However, when extremely low temperatures
are encountered for protracted periods during the winter
months, the SAE 80 viscosity grade may be used.
"Multi-Purpose" Gear Lubricants
Gear lubricants that will satisfactorily lubricate hypoid
rear axles have been developed and are commonly re-
ferred to as ' 'Multi-Purpose" gear lubricants meeting
U.S.
Army Ord. Spec. MIL-L-2105B.
These lubricants can also be satisfactorily used in
manual transmissions.
CAUTION: With Positraction rear axles use
special Positraction lubricant.
"Multi-Purpose" gear lubricants must be manufac-
tured under carefully controlled conditions and the
lubricant manufacturer must be responsible for the
satisfactory performance of his product. His reputation
is the best indication of quality.
Lubricant Additions
The lubricant level in the axle and transmission hous-
ings should be checked periodically. (Every 6,000 miles.)
It is recommended that any additions required to bring
up the lubricant level be made using the same type lubri-
cant already in the housing.
When checking lubricant level in transmission or rear
axle the unit being cheeked should be at operating
temperature. With unit at operating temperature the
lubricant should be level with bottom of the filler plug
hole.
If the lubricant level is checked with the unit cold
the lubricant level should be 1/2 inch below the filler
plug hole.
Lubricant Changes
The rear axle lubricant does not require changing for
the life of the vehicle. If additions are needed, or when
refilling the axle after service procedures, use lubricants
described above.
POWERGLIDE TRANSMISSION
NOTE: Every 12,000 miles, it is recommended
that the Powerglide low band be adjusted as
specified in Section 7 of this manual.
Every 6,000 miles--Check fluid level on dipstick with
engine idling, selector lever in neutral position, parking
brake set and transmission at operating temperature. If
fluid level is below full mark on dip stick, adding a small
amount of Automatic Transmission Fluid, General Motors
Automatic Transmission Fluid (Part Numbers 1050568-
69,
70) is recommended. If this fluid is not obtainable,
use Automatic Transmission Fluid Type 'A' bearing the
mark AQ-ATF followed by a number and the suffix letter
'A'.
Recheck fluid level on dip stick and again add a
small amount of fluid if needed to bring level to full
mark. DO NOT OVERFILL.
CHEVROLET CHASSIS SERVICE MANUAL
Page 18 of 659
LUBRICATION 0-16
Every 12,000 miles (more frequently*, depending on
severity of service, if vehicle is used to pull trailers,
carry full loads during high ambient temperatures,
operate in mountainous terrain or operate under other
severe conditions--Remove fluid from the transmission
sump and add one and a half quarts of fresh fluid for
Camaro and Chevy II and two quarts for Chevrolet,
Chevelle, and Corvette. Operate transmission through all
ranges and check fluid level as described above.
•Except if vehicle is equipped with transmission pro-
vided in heavy duty service options. If so equipped,
drain converter and pump every 12,000 miles and add
approximately seven and a half quarts of fresh fluid
for Chevy II and nine quarts for Chevrolet and Chevelle.
TURBO HYDRA-MATIC
Lubrication. recommendations for the Turbo Hydra-
Matic are the same as outlined for the Powerglide
transmission except for fluid capacity and filter change
listed below.
After checking transmission fluid level it is important
that the dip stick be pushed all the way into the fill tube.
Every 12,000 miles — after removing fluid from the
transmission sump, approximately 7 1/2 pints of fresh
fluid will be required to return level to proper mark on
the dip stick.
Every 24,000 miles, or at every other fluid change--
the transmission sump strainer should be replaced.
FRONT WHEEL BEARINGS
It is necessary to remove the wheel and hub assembly
to lubricate the bearings. The bearing assemblies should
be cleaned before repacking with lubricant. Do not pack
the hub between the inner and outer bearing assemblies
or the hub caps, as this excessive lubrication results in
the lubricant working out into the brake drums and
linings.
Front wheels of all passenger car models are equipped
with tapered roller bearings and should be packed with a
high melting point water resistant front wheel bearing
lubricant whenever wheel and hub are removed.
CAUTION: "Long fibre" or "viscous" type
lubricant should not be used. Do not mix wheel
bearing lubricants. Be sure to thoroughly clean
bearings and hubs of all old lubricant before
repacking.
The proper adjustment of front wheel bearings is one
of the important service operations- that has a definite
bearing on safety. A car with improperly adjusted front
wheel bearings lacks steering stability, has a tendency to
wander or shimmy and may have increased tire wear.
The adjustment of these bearings is very critical. The
procedure is covered in Section 3 of this manual under
Front Wheel Bearings—Adjust,
MANUAL STEERING GEAR
Check lubricant level every 36,000 miles. If required,
add EP Chassis Lubricant.
POWER STEERING
On models equipped with power steering gear, check
fluid at operating temperature in pump reservoir. Add
GM Power Steering Fluid, or, if this is not available, use
Automatic Transmission Fluid "Type A" bearing the
mark AQ-ATF followed by a number and the suffix letter
'A'
to bring level to full mark on dip stick.
AIR CONDITIONING
After the first 6,000 miles, check all hose clamp
connections for proper tightness.
Every 6,000 miles check sight glass under the hood,
after the system has been in operation for several
minutes. Sight glass should be clear but may, during
milder weather, show traces of bubbles. Foam or dirt
indicate a leak which should be repaired immediately.
BRAKE MASTER CYLINDER
Check level every 6,000 miles and maintain 1/4" below
lowest edge of each filler opening with GM Hydraulic
Brake Fluid Supreme No. 11.
PARKING BRAKE
Every 6,000 miles, apply water resistant lube to park-
ing brake cable, cable guides and at all operating links
and levers.
CLUTCH CROSS-SHAFT
Periodic lubrication of the clutch cross shaft is not
required. At 36,000 miles or sooner, if necessary;
remove plug, install lube fitting and apply CHASSIS
LUBRICANT.
CHASSIS LUBRICATION
For chassis lubrication, consult the lubrication chart.
It shows the points to be lubricated and how often the
lubricant should be applied.
The term "chassis lubricant" as used in this manual,
describes a water resistant EP chassis grease designed
for application by commercial pressure gun equipment.
CHEVROLET CHASSIS SERVICE MANUAL
Page 19 of 659
LUBRICATION 0-17
LUBRICATE EVERY 6,000 MILES
LUBRICATE EVERY 12,000 MILES
LUBRICATE EVERY 36,000 MILES
Refill Positraction Rear Axle with
Special Lubricant Only.
GL—Multi-purpose
or
Universal Gear Lubricant4
WB-Wheel Bearing Lubricant
(Whenever Brakes are serviced)
CL—Chassis Lubricant
EO-EngineOil
AT-Automatic Transmission Fluid {Type
A)
BF-Brake Fluid
Fig.
32—Lubrication Diagram—Chevrolet
1.
Front Suspension
2.
Steering Linkage
3. Steering Gear
4.
Air Cleaner
5. Crankcase Breather Cap
6. Front Wheel Bearings
7. Transmission
8. Rear Axle
9. Oil Filter
10.
Battery
11.
Parking Brake
12.
Brake Master Cylinder
CHEVROLET CHASSIS SERVICE MANUAL
Page 20 of 659
LUBRICATION 0-18
12
LUBRICATE EVERY 6000 MILES GL -Multi-purpose Gear Lubricant*
WB—Wheel Bearing Lubricant
LUBRICATE EVERY 12000 MILES (Whenever Brakes are serviced)
CL —Chassis Lubricant
LUBRICATE EVERY 36000 MILES E°-En9ine°il
"Refill Positraction Rear Axle with Special Positraction Rear Axle
Lubricant Only.
AT —Automatic Transmission Fluid (Type A)
SL —Steering Gear Lubricant
BF -Hydraulic Brake Fluid
1.
Front Suspension
2.
Steering Linkage
3. Steering Gear
Fig.
33—Lubrication Diagram—Chevelle
4.
Air Cleaner
5. Crankcase Breather Cap
6. Front Wheel Bearings
7. Transmission
8. Rear Axle
9. Oil Filter
10.
Battery
11.
Parking Brake
12.
Brake Master CylincU
CHEVROLET CHASSIS SERVICE MANUAL
Page 21 of 659
LUBRICATION
0-19
.
3-SPEED
4-SPEED
7 OVER DRIVE
10 9 5 1 6 2 '
AUTOMATIC
3 12 11
LUBRICATE EVERY 6,000 MILES GL-Gear Lubricant*
WB-Wheel Bearing Lubricant
(Wh Bk
AT-Automdtic Transmission Fluid
^ WB-Wheel Bearing Lubricant (Type A)
-TV
LUBRICATE
EVERY 12,000 MILES (Whenever Brakes are serviced)
' CL—Chassis Lubricant
• LUBRICATE EVERY 36,000 MILES EO_Engine Oil
BF
-Brake Fluid
•Refill Positt
Special Lubricant Only.
Axl«
with
1.
Front Suspension
2.
Steering Linkage
3. Steering Gear
Fig.
34—Lubrication Diagram—Chevy I!
4. Air Cleaner
5. Crankcase Breather. Cap
6. Front Wheel Bearings
7. Transmission
8. Rear Axle
9.
Oil Filter
10.
Battery
11.
Parking Brake
12.
Brake Master Cylinder
CHEVROLET CHASSIS SERVICE MANUAL
Page 22 of 659
LUBRICATION 0-20
3-SPEED
4—SPEED
AUTOMATIC
LUBRICATE EVERY 6000 MILES
LUBRICATE EVERY 12000 MILES
LUBRICATE EVERY 36000 MILES
*
Refill
positraction rear axle with
special lubricant only.
GL -GEAR LUBRICANT*
WB-WHEEL BEARING LUBRICANT
(WHENEVER BRAKES
ARE
SERVICED)
CL -CHASSIS LUBRICANT
CO-ENGINE
Oil;
AT -AUTOMATIC TRANSMISSION
FLUID (TYPE
A)
BF -BRAKE FLUID
Fig.
35—Lubricafion Diagram—Camaro
1.
Front Suspension
2.
Steering Linkage
3. Steering Gear
4.
Air Cleaner
5. Crankcase Breathe Cap
6. Front Wheel Bearings
7. Transmission
8. Rear Axle
9. Oil Filter
10.
Battery,
11.
Parking Brake
12.
Brake Master Cylinder
BODY LUBRICATION
See Body Service Manual
for
Body Lubrication,
cept Corvette)
(Ex-
CHEVROLET CHASSIS SERVICE MANUAL
Page 23 of 659
LUBRICATION
0-21
6
3-SPEED
4-SPEED
AUTOMATIC
10
LUBRICATE EVERY 6,000 MILES GL -Multi-purpose
or
Universal Gear Lubrincant*
-(V LUBRICATE EVERY 12,000 MILES WB-Wheel Bearing Lubricant
V/^ (Whenever Brakes
are
serviced)
AT —Automatic Transmission Fluid (Type)
BF -Brake Fluid
a
LUBRICATE EVERY 36,000 MILES
* Refill Positraction Rear Axle with
Special Lubricant Only.
CL -Chassis Lubricant
EO—Engine
Oil
Fig.
36—Lubrication Diagram—Corvette
1.
Front Suspension
2.
Steering Linkage
3. Steering Gear
4.
Air
Cleaner
5. Front Wheel
Bearings
6. Transmission
7. Rear Axle
8.
Oil
Filter
9. Battery
10.
Parking Brake
11.
Brake Master Cylinder
BODY LUBRICATION POINTS (CORVETTE)
Lubricate the following items when possible.
Hood Latch Mechanism and Hinges --Apply light engine oil
to pivot points. Don't oil lock pins or catch plates.
i
Rear Compartment Lid Release and Hinges --Apply light
engine
oil.
Side Door Hinge Pins—Apply light engine oil.
Door Lock Rotor and Striker Plate—Apply light engine oil or
stainless stick lubricant.
Lock Cylinders—Lubricate with powdered graphite.
Window Regulators and Controls and Door Lock Remote
Link —Apply light engine
oil.
Gas Tank Filler Cap Hinge—Apply light engine oil.
Weatherstrips and Rubber Bumpers —Coat lightly with
a
rubber lubricant.
CHEVROLET CHASSIS SERVICE MANUAL
Page 382 of 659
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
Page 395 of 659
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