STEERING
9-32
arm on frame and install mounting bolts, washers
and nuts. No washer is used on Corvette.
Install relay rod to idler arm, ^making certain seal
is on stud. Install and tighten nut.
Install cotter pin.
Refer to torque specifications at rear of manual for'
correct torque values.
Chevy II (Fig. 62}
Removal
1.
Remove cotter pin, nut and washer securing idler
arm to relay rod.
2.
Remove relay rod from idler arm.
3.
If equipped with power steering disconnect power
cylinder shaft from idler arm bracket.
4.
Remove three idler bracket to frame bolts and nuts
and remove bracket and idler arm assembly.
5.
Remove cotter pin, nut, washer and bolt securing the
idler arm to the bracket.
6. Press out the idler arm bushing for replacement.
Installation
NOTE: Installation must be done with front
wheels straight ahead or the car will lead to one
side.
1.
Install idler arm bushing, if previously removed.
NOTE: Make certain the outer sleeve of the
bushing does not protrude above surface of idler
arm.
2.
Reverse removal procedure and torque all nuts ac-
cording to specifications.
PITMAN ARM
Removal
1.
Remove cotter pin from pitman arm ball stud and
remove nut.
2.
Remove relay rod from pitman arm by tapping on
side of rod or arm in which the stud mounts with a
hammer while using a heavy hammer or similar tool
as a backing. Pull down on relay rod to remove
from stud.
3.
Remove pitman arm nut from sector shaft and mark
relation of arm position to shaft.
4.
Remove pitman arm with Tool J-6632 as shown in
Figure 2.
Installation
1.
Install pitman arm on sector shaft, lining up the
• marks made upon removal.
2.
Install sector shaft nut.
3.
Position relay rod on to pitman arm. Install nut.
Continue to tighten arm enough to align castellation
with hole in stud and install cotter pin.
STEERING ARM
If, through collision or other damage, it becomes nec-
essary to remove and replace either steering arm, pro-
ceed as follows:
Removal
1.
Remove tie rod from steering arm as outlined in this
section.
2.
Remove front wheel, hub and brake drum as a unit
by removing hub cap and dust cap, cotter pin from
spindle nut and the spindle nut. Pull assembly to-
ward outside of vehicle. If removal is difficult, it
may be necessary to back off brake adjustment to
increase brake shoe-to-drum clearance; see Hy-
draulic Brake Adjustment, Section 5. On models
with disc brakes, remove caliper and disc.
3.
With wheel and drum assembly or caliper and disc
removed, steering arm retaining bolt heads are ac-
cessible and removal of steering arm from vehicle
may be accomplished by removing retaining nuts.
Installation
1.
Place steering arm in position on vehicle and install
retaining bolts*
2.
Install nuts. Use only the special locknut listed for
this use in the Chevrolet Parts Catalog.
3.
Pack wheel bearings using a high quality wheel
bearing lubricant. Install bearings and wheel-hub-
brake drum assembly removed previously. On disc
brake models, install disc and caliper.
4.
Install keyed washer and spindle nut. Proceed as out-
lined under t{ Front Wheel Bearing Adjustment" in
Section 3.
5.
Install tie rod ball stud in steering arm. Be sure that
the dust cover is in place on ball stud.
6. Install castellated nut on ball stud, tighten securely
and install cotter pin.
7.
Following directions given in Section 3 to check cor-
nering wheel relationship and toe-in; correct as
required.
STEERING DAMPER-CORVETTE
Removal
1.
Remove bolt from damper pivot bracket at relay rod.
2.
Remove nut from damper pivot at frame bracket and
withdraw damper assembly.
Damper is serviced as a unit. Replace damper if
3.
damaged or excessively worn.
Installation
1.
Place piston rod end into frame bracket and install
retainers, bushings, and nut.
2.
Insert cylinder end pivot into relay rod bracket and
install through bolt.
CHEVROLET CHASSIS SERVICE MANUAL
WHEELS AND TIRES 10-2
either case, tires will revolve with a side motion and
scrape the tread rubber off. If misalignment is severe,
the rubber will be scraped off of both tires (or all four
tires if front toe is not correct); if slight, only one will
be affected.
The scraping action against the face of the tire causes
a small feather edge of rubber to appear on
one .side
of
the tread and this feather edge is certain indication of
misalignment (fig. 1). The remedy is. readjusting toe-in
within specifications, or rechecking the entire front end
alignment if necessary.
Heei and Toe
This is a saw-toothed effect where one end of each
tread block is worn more than the other.
The end that wears is the one that first grips the road
when the brakes are applied.
Heel and toe wear is less noticeable onsrear tires than
on front tires, because the propelling action of the rear
wheels creates a force which tends to wear the opposite
end of the tread blocks. The two forces, propelling and
braking, make for more even wear of the rear tires,
whereas only the braking forces act on the front wheels,
and the saw-tooth effect is more noticeable.
A' certain amount of heel and toe wear is normal.
Excessive wear is usually due to high speed driving and
excessive use of brakes. The best remedy, in addition
UNDERINFLATION WEAR
Fig.
1 - Toe In or Toe Out Misalignment Wear
Fig.
2 - Over and Under Inflation Wear
CHEVROLET CHASSIS SERVICE MANUAL
WHEELS AND TIRES 10-3
Fig.
3 - Spof Wear
to cautioning the owner of his driving habits, is to inter-
change tires regularly.
Side
This may be caused by incorrect wheel camber, under-
inflation, high cambered roads or taking corners at too
high a rate of speed.
The first two causes are the most common. Camber
wear can be readily identified because it occurs only on
one side of the treads, whereas underinflation causes
wear on both sides (fig. 2).
There is, of course, no correction for high cambered
roads.
Cornering wear is discussed further on.
Center
This is caused primarily by overinflation pf the tire
(fig. 2). Invisible fabric damage can also be caused by
overinflation.
Uneven
Uneven or spotty wear (fig. 3) is due to such irregu-
larities as unequal caster or camber, bent front or rear
suspension parts, out-of-balance wheels, brake drums
Fig.
4 - Cornering Wear
out-of-round, brakes out-of-adjustment, or other me-
chanical conditions. The remedy in each case consists
of locating the mechanical defect and correcting it.
Cornering
Since the introduction of independent spring front and
rear wheels, improvements in spring suspension have
enabled drivers to negotiate curves at higher rates of
speed with the same feeling of security that they had
with the older cars at lower speeds. Consequently,
curves are being taken at higher speeds with the result
that a type of tire wear called "Cornering Wear" (fig. 4),
frequently appears.
When a car makes an extremely fast turn, the weight
is shifted from a normal loading on all four wheels to an
abnormal load on the tires on the outside of the curve
and a very light load on the inside tires due to centrifugal
force. This unequal loading may have two unfavorable
results.
First, the rear tire on the inside of the curve may be
relieved of so much load that it is no longer geared to
CHEVROLET CHASSIS SERVICE MANUAL
WHEELS AND TIRES 10-5
WHEELS
The wheel and tire assembly should be removed from
vehicles equipped with disc brakes to properly perform
balancing operations. This is necessary due to drag of
the spring loaded brake shoes on the disc.
Static Balancing (W/Tire)
Static Balance (still balance) is the equal distribution
of weight of the wheel and tire assembly about the axis
of rotation so that the assembly has no tendency to rotate
by
itself.
Static unbalance causes the pounding action of
the front wheels that is called "tramp".
To correct static unbalance (front and rear): The
quickest and best methods to correct static unbalance
are through the use of wheel balancers which are com-
mercially available. Refer to the Information and in-
structions included with these balaricers.
Dynamic Balancing (W/Tire)
Dynamic Balance (running balance) requires the wheel
to be not only in static balance, but balanced and running
smoothly while turning on an axis which runs through the
centerline of the wheel and tire perpendicular to the axis
of rotation.
The quickest and best methods of testing and correcting
dynamic unbalance are by the use of dynamic wheel
balancers which are commercially available. These bal-
ancers include all necessary information on where and
how the balancing weights should be placed. The follow-
ing information, however, will help in the correction of
dynamic balance.
NOTE:
Before attempting to balance the
wheels, check to be certain that no foreign
matter has been trapped in the wheel ventila-
tion slots or in the accessory wheel discs. This
is especially important if the vehicle has been
run in soft mud and then parked in freezing
weather.
When a wheel that is statically unbalanced is dynam-
ically in balance the dynamic balance can be retained
while correcting "the static balance by installing the cor-
rective weights so that half of the weight required is
placed on the inner edge of the rim and the other half
on the outer edge of the rim.
Dynamic unbalance can be corrected without destroying
static balance by installing weights so half of weight
required for dynamic balance is placed on the rim op-
posite the heavy point, while the other half is placed 180°
away and on the opposite side of the rim.
NOTE:
Vehicles with wire wheel covers should
have the wheels balanced with the wire wheel
covers installed on the wheels.
Run Out (W/OTire)
The wheels should not run out (wobble) more than
1/16" as measured on the side of the rim at the base
of the tire. Excessive run-out is the result of a bent
wheel, an improperly mounted wheel, worn knuckle bear-
ings or steering connections. These parts should be
checked for correct adjustment, proper alignment and
wear whenever excessive run-out is encountered.
The wheels should also run concentric with the steering
knuckle spindle within 1/16 inch as measured on the tire
bead seat of the rim with the tire removed.
Wheel run-out, eccentricity and balance are closely
associated with steering and front wheel alignment.
Further information on these subjects will be found under
"Suspension".
Cleaning Aluminum Wheels
Do not use wire brush or abrasive cleaners when
cleaning wheels. Use only cleaners that will not react
with aluminum.
SERVICE OPERATIONS
TIRES
Removal
Dismounting tubeless tires presents no problems if the
correct procedures are used and the following precau-
tions observed.
1.
Remove the valve cap and valve core. Let out all the
air.
2.
Press the inner side of the tire into the rim well.
Use bead loosening tool or if regular tire irons are
used, take particular care not to injure or tear the
sealing ribs on the bead.
CAUTION: Never use tire irons with sharp
edges or corners.
3.
Using tire irons on the opposite side, remove bead,
taking small "bites" around the rim.
4.
Turn the tire over, and use two tire irons, one be-
tween the rim flange and the bead to pry the rim
upward, the other iron to pry outward between the
bead seat and the bead.
Installation
Extreme care must be exercised to prevent injury to
the sealing bead and circumferential bead when forcing
tire over rim.
1.
Apply a light film of Ruglyde or other suitable rubber
lubricant to sealing bead of tire.
NOTE:
The use of excessive lubrication may
lead to rim slippage and subsequent breaking of
air seal.
2.
Carefully mount the outer bead in usual manner by
using tire irons, taking small "bites" around rim,
being careful not to injure the tire bead.
CAUTION: DO NOT use a hammer, as damage
to the bead will result.
3.
Install the inner bead in the same manner.
NOTE:
If a seal cannot be effected in the fore-
going manner with the rush of air it can be
, accomplished by applying to the circumference
of the tire a tire mounting band or heavy sash
cord and tightening with the use of a tire iron.
On tire mounting machines, bouncing the tire
assembly is not required. The tire should be
CHEVROLET CHASSIS SERVICE MANUAL
CHASSIS SHEET METAL 11-17
Fig.
28- Hood Spring Removal
Installation
Skirt installation is written for the installation of a
stripped skirt, with suspension and otiier parts added
after skirt is attached to vehicle. Proceed as follows:
1.
Position skirt assembly on vehicle with insulator,
shown in Figure 26, in place and original shims in-
stalled at top dash mount
2.
Install the three bolts at top mount and four bolts at
lower dash brace.
3.
Install front crossmember, replacing the four bolts
and nuts removed previously.
4.
Replace engine mount cushion; refer to Section 6.
5.
Install front suspension parts as outlined in Sec-
tion 3. Connect stabilizer link to stabilizer (if so
FINAL POSITION
Fig.
30 - Installing Hood Molding Clip
equipped) and connect tie rod end to steering arm as
outlined in Section 9.
6. Install radiator support and fender assembly as out-
lined in this section. Install grille (Section 13).
7.
If left skirt was removed, proceed as follows:
a. Install steering gear. Carefully follow outline
under Steering Gear - Installation in Section 9.
Do not fail to perform adjustments listed under
Mast Jacket Installation in that section.
b.
Install clutch cordon shaft (if so equipped).
c. Install power steering hose clamp (if so equipped).
8. Install brake lines and bleed brakes as outlined in
Section 5.
9. Install hood and adjust as outlined in this section.
10.
Perform following checks and adjustments:
a. Check and adjust front body section alignment
as outlined in Fisher Body Service Manual.
Fig.
29 - Installing Tool J-9559 in Nev/Spring
Fig.
31 - Removing Front End Assembly from Vehicle
CHEVROLET CHASSIS SERVICE MANUAL
5.
6.
7.
8.
2.
Install all fender mounting screws, replacing original
shimming. Refer to removal procedure for screw
location.
3.
Install hydraulic lines at main cylinder and right
hand skirt. Install fuel line at right hand skirt.
4.
Install steering gear as outlined in Section 9. Do
not fail to perform adjustment procedure listed under
Mast Jacket - Installation.
CAMARO
INDEX
Page
General Description 20
Maintenance and Adjustments 20
Hood / . 20
Hinge 20
Bumpers ' . . . 20
Catch Assembly 21
Lock . 21
Fenders 21
Sheet Metal 22
CHASSIS SHEET METAL 11-19
Install pitman arm as outlined in Section 9 under
Maintenance and Adjustments - Steering Gear Ad-
justments.
Remove jack stands and jack.
Bleed brakes as outlined in Section 5.
Perform body alignment as outlined in Fisher Body
Service Manual.
Page
Component Part Replacement . 22
Battery Tray 22
Radiator Support 22
Fender and Skirt Assembly 22
Hood Assembly . 22
Lock and Catch Assembly 22
Trim and Insulation . . . 24
Cowl Vent Grille . . 24
Fig.
32 - Front End Sheet Metal - Camaro
1.
Fender
2.
Hood Hinge
3. Hood
4.
Cowl Vent Grille
5. Trim
6. Molding
7. Fender Extension
8. Bumper Bracket
9. Valance Pane!
10.
Header Panel
11.
Radiator Support
12.
Radiator
13.
14.
15.
Shroud
Hood Lock
Radiator Cap
16.
17.
18.
Bracket (V-8
Hood Catch
Brace
Engine
Only)
19.
20.
21.
Skirt
Seal
Battery
Tray
CHEVROLET CHASSIS SERVICE MANUAL
ACCESSORIES 15-7
6. The car begins to descend a hill--car speed in-
creases slightly and the regulator movements oc-
curing above occur again except in reverse. The
rubber drum is turned further against spring tension
and the air bleed orifices are uncovered more. This
bleeds more air to the Servo reducing the vacuum in
the unit. The diaphragm moves away from the
vacuum port, closes the throttle slightly, and with-
draws the tapered needle from the vacuum orifice.
With the orifice enlarged, the increased vacuum
counteracts the increased air bleed and the dia-
phragm finds a balance again at a reduced throttle
opening.
7.
Driver accelerates by pressing accelerator pedal-
car speed increases and the system responds by
moving the diaphragm to decrease throttle opening.
Since a bead chain is used, the chain merely relaxes
and has no effect on throttle operation. After the
driver releases pressure from the pedal, the throttle
will close until car speed decreases to the pre-set
speed. At that point the Regulator bleeds less air
to the Servo which opens the throttle enough to
maintain the pre-set speed. The system returns to a
stable condition.
8. Driver desires higher controlled speed, presses ac-
celerator until new speed is reached, and depresses
Engagement Switch fully and releases button--speed
sensing assembly tries to turn in a direction that
would decrease the throttle opening until the driver
fully depresses the Engagement Switch. Then the
current is cut off to the solenoid which retracts; the
solenoid nose expands the "U" clip releasing its
grip on the rubber drum. The drum and disk as-
sembly then rotates to a new position because of the
higher car speed. When the solenoid retracts, it also
shuts off vacuum to the Servo and opens the vacuum
port to atmospheric pressure within the Regulator
thereby bleeding down the Servo toward idle throttle
position. As the driver releases the Engagement
Switch, the contacts cause "pull in" and "hold in" of
the solenoid respectively. The system is engaged to
maintain the car speed at the time of Engagement
Switch release.
9. Driver desires lower cruising speed, presses En-
gagement Switch fully, waits until car speed de-
creases to desired speed then releases Switch--when
the Engagement switch is fully depressed the sole-
noid is de-energized causing the vacuum switch to
bleed down the Servo to idle throttle position and the
"U"
clip of the idle bleed valve is released from the
rubber drum. The drum and disk assembly is free
to rotate to a position which corresponds to vehicle
speed as the car slows. When the driver releases
the Engagement Switch, the unit "pulls in" and "holds
in" in the normal manner. The air bleed valve is
clutched to, the rubber drum at the car speed during
switch release. Vacuum is again applied to the
Servo and throttle control is assumed by the Regu-
lator to maintain the car speed at the time of switch
release.
10.
With system in operation, driver applies brakes--
simultaneously the Vacuum Release and Electric
Release Switches operate. The Vacuum Switch
bleeds air into the Servo through the air bleed line
coming from the Regulator. The vacuum is reduced
in the Servo and the throttle returns to idle position.
The Electric Release Switch cuts off power to the
entire system and the solenoid is de-energized. If
the driver removes his foot from the brake pedal the
Electric Switch again feeds voltage to the Engage-
ment Switch and the Vacuum Switch seals the air
bleed line. If the vehicle speed is above 20 mph
when this occurs, reduced voltage will flow to the
solenoid through the 40 ohm wire which will not be
sufficient to "pull in" the unit. If vehicle speed is
below 20 mph no current will flow since the tang
on the rubber drum has opened the low limit switch
points in the Regulator. In either case, after de-
pressing the brake pedal, the system will not con-
trol car speed until the driver operates the engage-
ment switch above 20 mph.
SERVICE OPERATIONS
The components of the Cruise Master system are de-
signed to be replaced should they become inoperative.
The Regulator is calibrated in such a manner during
manufacturing that overhaul operations are impractical.
However, one adjustment may be made to the Regulator to
correct speed drop or increase at the time of
engagement.
BRAKE RELEASE SWITCHES
ELECTRIC
Service — An inoperative switch must be replaced.
Switch replacement is identical to standard brake lamp
switch replacement.
Adjustment- The brake switch plunger must clear the
pedal arm when the arm is moved 1/4 inch measured at
the switch (Figure 7).
VACUUM
Service
—
An inoperative (sticking, plugged, or leaking)
switch must be replaced. Switch replacement is similar
to brake switch replacement. Be certain that the hose to
the switch is connected firmly and is not cracked or
deteriorated.
Adjustment- The brake switch plunger must clear the
pedal arm when the arm is moved 5/16 inch measured at
the switch (Figure 7).
ENGAGEMENT SWITCH
Service
replacement.
The engagement is serviced only by
Removal
1.
Pry the engagement button out of the turn signal knob
with a small thin bladed screwdriver (Figure 2).
2.
With a small hook or long nosed pliers, remove the
switch retaining ring.
3.
.Pull switch outward utilizing the slack in the wiring
harness.
4.
With a small soldering iron, unsolder the wires and
resolder them to the correct terminals of the re-
placement switch.
CHEVROLET CHASSIS SERVICE MANUAL
SPECIFICATIONS
2
RIDING HEIGHT MEASUREMENT*
Chevrolet
All Biscayne
and Bel Air 2 and 4
Doors,
All Impala
and
Caprice
4
Doors
and
All Station Wagons
. . . .
All Impala
and
Caprice
2
Doors
. . . . .
5-1/8"
± 1/2"
5-3/8"
± 1/2"
Chevelle
All Sedans
SS Coupe
and
Convertible
El Camino
and
Station W*
1-3/811
± 1/2"
1-1/8"
± 1/2"
..
2" ± 1/2"
Chevy
u
All
4 and 6
Cylinder Standard
2 and 4
Doors,
All Station Wagons,
and 6
Cylinder Nova
4
Door
All
8
Cylinder Standard
2 and 4
Doors,
All
Nova
2
Doors
and 8
Cylinder Nova
4
Door
. . .
3-3/4'
3-1/4'
±
1/2'
±
1/2'
Corvette
With
327 or 427
Engine
. . . .
327 Engine with
A/C or 427
Engine with
A/C,
P.S.,.and
P.B
Convertible with
327
Engine, Hardtop,
A/C, P.S., P.B., and
Powerglide
427 Engine with Optional Suspension
.
2-1/2"
.
2"
1-1/2"
1-1/2"
±
1/2"
±1/2"
±
1/2"
±
1/2"
Camaro
With
230
Engine
..... . . .
With
250
Engine
.... ...
With
283 - 327 and
350 Engine
2-3/4"
2-7/8"
2-5/8"
± 1/2"
± 1/2"
± 1/2"
•Must be within 1/2" from side to side
BOLT TORQUES
TORQUES
Spherical Joint
Upper Stud
Nut
Lower Stud
Nut
Stud
to
Control
Arm Nuts (Service)
Lower Forging
Nut
Steering
Arm
Attaching Nuts
Shock Absorber
Upper Shaft
Nut
Lower Attachment
Bracket
to
Spring Tower
Stabilizer
Bar
Frame Bracket Bolts
Link Nuts
Strut
Rod
Rod
to Arm Nut
Adjustment
Nut
Front Spring
Spring Seat
to
Control
Arm Nuts
Lower Control
Arm
Inner Pivot Nuts
Upper Control Arm
Attaching Nuts
Collar Bolts
Brake Anchor Pin
Drum Brakes
Brake Anchor Bolt
Disk Brakes
Lower Control Arm
Cross Shaft Bolts
Front
Rear .
Wheel Stud Nuts
Chevrolet
50 ft. lbs.
80 ft lbs.
25 ft. lbs.
40 ft. lbs.
50 ft. lbs.
8 ft. lbs.
15 ft. lbs.
—
15 ft lbs.
8 ft. lbs.
70 ft lbs.
80 ft lbs.
115 ft lbs.
75 ft lbs.
45 ft lbs.
130 ft lbs.
—
65 ft lbs.
Chevelle
50 ft lbs.
80 ft lbs.
25 ft. lbs.
—
85 ft lbs.
8 ft lbs.
20 ft lbs.
—
15 ft lbs.
8 ft lbs.
—
80 ft lbs.
50 ft. lbs.
45 ft. lbs.
130 ft lbs.
—
65 ft lbs.
Chevy H
45 ft lbs.
45 ft lbs.
25 ft lbs.
—
65 ft. lbs.
8 ft lbs.
9 ft lbs.
9 ft. lbs.
9 ft. lbs.
10 ft. lbs.
45 ft lbs.
80 ft lbs.
30 ft lbs.
65 ft lbs.
50 ft. lbs.
50 ft lbs.
130 ft lbs.
_
—
65 ft lbs.
Corvette
45 ft lbs.
20 ft lbs.
20 ft lbs.
—
20 ft lbs.
10 ft lbs.
—
10 ft lbs.
10 ft. lbs.
—
95 ft lbs.
35 ft lbs.
40 ft lbs.
75 ft lbs..
70 ft lbs.
135 ft lbs.
75 ft lbs.
Camaro
50 ft lbs.
65 ft lbs.
25 ft lbs.
—
85 ft lbs.
8 ft lbs.
20 ft lbs.
.
—
15 ft. lbs.
8 ft._lbs.
_
85 ft lbs.
50 ft lbs.
45 ft lbs.
130 ft lbs.
_
—
65 ft lbs.
CHEVROLET CHASSIS SERVICE MANUAL