cruise control CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
[x] Cancel search | Manufacturer: CHEVROLET, Model Year: 1967, Model line: CAMARO, Model: CHEVROLET CAMARO 1967 1.GPages: 659, PDF Size: 114.24 MB
Page 492 of 659
CHASSIS SHEET METAL 11-5
GRILLE TO BE FLUSH
TO +.06 TO W/SHIELD
MOLDING
±.06 GRILLE TO FENDER
.06 -.05 FENDER TO
W/SHIELD MOLDING
GRILLE"
& FENDER; ~ ~
FLUSH ± .06
FENDER FLUSH TO .06 INBOARD
OF DOOR SURFACE. FULL LENGTH
OF VERTICAL OPENING.
12±.O6 HOOD
TO GRILLE
.12 -.04
TO FENDER
FLUSH ± .06
HOOD TO GRILLE
FLUSH ± .06
HOOD TO FENDER
.12/.17 (REF.)
AT RAD. SUPPORT
.18 ± .06 FENDER
TO DOOR
FLUSH ± .06
HOOD TO FENDER
09 zfc .06 FENDER
TO ROCKER
.75 (REF.) AT
TOP FLANGE
1.08 EXC. WAG
URFACE
TYPICAL ON SURFACE
FLUSH CONDITION
DESIRED
.75 REF.
Fig.
4
- Sheet Metal Adjustments - Chevrolet
1.
Remove fender as outlined above.
2.
Jack up front end of vehicle and remove wjheel.
3.
Remove all wires, hoses, cruise control, etc. at-
tached to skirt; also remove bolt attaching battery
tray bracket to skirt. Remove battery, j
Remove battery tray from vehicle. \
5.
On Chevrolet, remove screws securing bj:ace (fig. 1)
to skirt and dash panel and remove brace.;
Remove skirt attaching screws and remove skirt
from vehicle.. !
4.
6.
Installation
j
Install skirt and fender following the removal proce-
dure in reverse order. Refer to torque specifications in
rear of manual for correct torque values. !
FENDER TRIM
On Chevelle, to gain access to spear molding and em-
blem retaining nuts, remove skirt to fender flange screws
top center rearward and pry skirt forward several inches.
Wedge skirt in this position with a wood block and re-
move nuts from inside fender retaining molding to fender.
Emblem attaching hardware is accessible from inside
engine compartment. t
On Chevrolet, open front door and rear inside door
hinge pillar for access to trim retaining nuts. Remain-
ing trim retaining nuts, and emblem retaining nuts are
accessible from inside engine compartment.
CHEVROLET CHASSIS SERVICE MANUAL
Page 509 of 659
CHASSIS SHEET METAL 11-22
wiring harness, and washer bottle from radiator
support.
5.
Remove screw connecting battery tray to radiator
support.
6. Remove shroud from vehicle if so equipped.
7.
Remove shroud and radiator (Section 13).
8. Remove screws securing support to frame, skirts,
and fenders.
9. Remove radiator support from vehicle.
Installation
Install radiator support following the removal pro-
cedure in reverse order. Refer to torque specifications
in rear of manual for correct torque values for radiator
supportj grille, and bumper.
FENDER AND SKIRT ASSEMBLY
Removal
1.
Remove front bumper (Section 14).
2.
Remove hood and hood.hinges (two men).
3.
Remove bolts securing brace to skirt and dash panel
and remove brace (fig. 32).
4.
Disconnect any components attached to fender and
skirt such as cruise control, hoses, electrical har-
ness etc.
5.
Remove screws securing radiator support to fender
and skirt.
6. Remove headlamp bezel and headlamp.
7.
Remove screws securing fender and skirt assembly
to header panel, headlamp housing and valance panel.
Remove screw securing fender extension to valance
panel.
8. Remove screws securing fender and skirt assembly
to vehicle and remove fender and skirt assembly.
9. If necessary, remove screws attaching fender ex-
tension and bumper bracket to fender and remove
extension and bracket. Replace fender trim if nec-
essary.
Installation
Install fender anci skirt assembly following the removal
procedure in reverse order. Refer to torque specifi-
cations in rear of manual for correct torque values.
HOOD ASSEMBLY
Procedures for hood removal and installation for
Camaro are the same as for Chevrolet and Chevelle.
Refer to Chevrolet and Chevelle hood removal and in-
stallation procedures, Figure 35 for Camaro hood catch,
support, and lock plate, and Figure 37 for Camaro hood
and insulator.
HOOD CATCH AND LOCK (Fig. 35)
Removal
1.
Remove catch plate assembly by removing screws
retaining catch to header panel, center support, and
radiator support.
NOTE: Before removing hood lock plate from
hood, locate position on hood by scribing around
base of lock plate.
2.
Remove lock plate by removing screws retaining lock
plate to hood and remove lock plate.
Fig.
35 - Hood Catch, Support, and Lock Plate - Camaro
Installation
Install lock and catch plate following the removal pro-
cedure in reverse order. Refer to torque specifications
in rear of manual for correct torque values. Adjust lock
and catch plate as outlined under adjustment procedure
in this section.
HOOD TRIM AND INSULATION (Fig. 37}
. Figure 37 shows the installation details of the Camaro
hood ornament and insulation pad. The insulation and
ornament retainers and nuts are accessible from under
the raised hood.
COWL VENT GRILLE
.Procedures'for Camaro cowl vent grille replacement
are the same as for Chevrolet and Chevelle. Refer to
Chevrolet and Chevelle cowl vent grille replacement.
CHEVROLET CHASSIS SERVICE MANUAL
Page 610 of 659
SECTION 15
ACCESSORIES
CONTENTS OF THIS SECTION
Page
Cruise Master . . . . .......... 15-1
Automatic Level Control 15-12
CRUISE-MASTER
INDEX
Page
General Description . 15-2
System and Component Operation 15-2
Service Operations . . ...... 15-7
System Checks 15-10
REGULATOR TO
INTAKE MANIFOLD HOSE
SERVO All
BLEED HOSE
VACUUM RELEASE
SWITCH HOSE
THROTTLE
CHAIN
CABLE TO
SPEEDOMETER
ENGAGEMENT
BUTTON
RIC RELEASE
SWITCH
VACUUM RELEASE
SWITCH
SPEEDOMETER CABLE
MOUNTING
BRACKET
WIRING HARNESS FROM ENGAGEMENT
BUTTON & CUTOFF SWITCH
SERVO VACUUM
SUPPLY
Fig.
1 - Cruise Master System
CHEVROLET CHASSIS SERVICE MANUAL
Page 611 of 659
ACCESSORIES 15-2
GENERAL DESCRIPTION
The Cruise Master is a speed control system which
employs engine manifold vacuum to power the throttle
Servo unit. The Servo moves the throttle when speed
adjustment is necessary by receiving a varying amount
of bleed air from the Regulator unit. The Regulator
varies the amount of bleed air through a valve system
which is linked to a speedometer-like mechanism. The
speedometer cable from the transmission drives the
Regulator, and a cable from the Regulator drives the
instrument panel speedometer. The. engagement of the
Regulator unit is controlled by an Engagement Switch
located at the end of the turn signal lever. Two brake
release switches are provided: an Electric Switch dis-
engages the Regulator unit and a Vacuum Switch de-
creases the vacuum in the Servo unit to quickly return
the throttle to idle position.
The operation of each unit of the system and the
operation of the entire system under various circum-
stances is described below. Figure 1 shows the location
of the system components within the vehicle-
COMPONENT OPERATION
ENGAGEMENT SWITCH
This switch, located within the turn signal knob, has
three positions. In the fully released position, the switch
passes current through resistance wire to effect a "hold
in" magnetic field in the Regulator solenoid. This cur-
rent is sufficient only to hold the solenoid in place once
it has been actuated by the "pull in" circuit. Depressing
the button partially allows current to flow to the Regu-
lator solenoid at full voltage which causes the solenoid
to pull in. Depressing the button fully opens the circuit
to both the resistance and standard solenoid feed wires
and the solenoid becomes de-activated.
During vehicle operation the three switch positions
have the following functions:
Released
a. System not engaged: No function of the system
will occur although a small current is flowing
through the solenoid via the resistance wire (at
vehicle speeds over 20 mph).
b.
System engaged: The small current flowing
through the resistance wire is holding the solenoid
in the engaged position.
^r-WIRE RELIEF LUG
1 ^-#2-BLUE WIRE
L'3.BLACK WIRE
X /-TURN SIGNAL LEVER
SWITCH—^
^SN
RETAINING RING-^ %^
BUTTON -^
Fig.
2 - Cruise Master Engagement Switch
Partially Depressed
Full voltage is applied to the solenoid (vehicle speed
over 20 mph) which sets the Regulator to maintain the
vehicle speed at the time of Regulator engagement.
Fully Depressed
No electricity flows to the solenoid and the Regulator
is inactive. This position is used by the driver when he
desires to raise or lower his controlled speed. He may
accelerate to his new speed, press the button fully (Regu-
lator releases previously set speed) and release the but-
ton. Upon releasing the button, it passes through the
partially depressed position and the solenoid is "pulled
in", then into released position which provides "hold in"-
current. The driver may also press the button fully with
no pressure on the accelerator pedal. In this case the
regulator releases control of the throttle which returns
to idle and the car slows. When the button is released
the solenoid is pulled in and held in respectively and the
regulator resumes speed control at the speed of the
vehicle during the moment of button release (at vehicle
speeds over 20 mph).
LOCK
NUT
ORIFICE
TUBE
AND
CONNECTOR
ASSEMBLY
AIR FILTER AND
SOLENOID HOUSING COVER
Fig. 3 - Regulator Unit
CHEVROLET CHASSIS SERVICE MANUAL
Page 612 of 659
ACCESSORIES 15-3
CONTROLLED AIR SUPPLY
FROM REGULATOR
DIAPHRAGM
SPRING
METERING ROD
VARIABLE ORF1CE
ENGINE AAANIFOLD VACUUM
FROM REGULATOR VACUUM VALVE
BEAD CHAIN
VACUUM CHAMBER —*
MOUNTING SCREW
Fig.
4- Servo Unit
BRAKE RELEASE SWITCHES
Two brake release switches are employed in the Cruise
Master System. When the brake pedal is depressed, an
Electric Release Switch cuts off the voltage supplied to
the engagement switch, hence cuts off power to the Regu-
lator unit. The Regulator is then disengaged and requires
Engagement Switch operation to return it to operation.
A Vacuum Release Switch operates simultaneously with
the electric release switch whenever the brake pedal is
depressed. This switch opens a port to atmospheric
pressure which rapidly bleeds down the vacuum in the
Servo unit thereby returning the throttle to the idle
position.
SERVO UNIT
The Servo unit is a vacuum actuated, variable position
diaphragm assembly which operates the carburetor throt-
tle when the system is in operation (fig. 4). It is powered
by engine intake manifold vacuum and operates the throt-
tle linkage via a bead chain. The Servo has two ports on
the sealed side of the diaphragm housing: one is supplied
manifold vacuum, and the other is connected to a variable
air bleed in the Regulator Unit. The vacuum port is
located at the center of the unit and the air bleed port
is near the outer wall. When vacuum is applied to the
center port, atmospheric pressure moves the diaphragm
which pulls on the bead chain opening the carburetor
throttle. As the diaphragm moves, it positions a tapered
needle within an orifice in the vacuum port so that as the
diaphragm moves toward the port, the orifice becomes
smaller; and as it moves away from the port, the orifice
becomes larger.
The air bleed port serves to supply a variable quantity
of air to the diaphragm chamber which causes the dia-
phragm to attain a balanced state (between the force of
the atmospheric pressure to chamber pressure differ-
ential and the force of the diaphragm and throttle return
springs). In operation then, the following events occur:
Vacuum is applied to the center port and the diaphragm
moves toward the port. The tapered needle restricts
the vacuum port more and more as it moves into the
orifice. If no air was allowed to bleed into the chamber,
the diaphragm would move until it contacted the housing,
however, the Regulator meters bleed air into the chamber
and the diaphragm reaches a point at which the air is
bled out of the chamber through the vacuum port orifice
as fast as it enters the air bleed port. If the Regulator
begins to supply less bleed air, (vehicle speed decreas-
ing) the vacuum in the chamber increases and the dia-
phragm moves toward the vacuum port. In so doing, the
tapered needle closes the vacuum port orifice even more
CHEVROLET CHASSIS SERVICE MANUAL
Page 616 of 659
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
Page 618 of 659
ACCESSORIES 15-9
Adjustment- Adjust the bead chain so that it is as tight
as possible without holding the throttle open when the
carburetor is set at its lowest idle throttle position.
When connecting the bead chain (engine stopped) manually
set the fast idle cam at its lowest step and connect the
chain so that it does not hold the idle screw off the cam.
If the chain needs to be cut, cut it three beads beyond the
bead which pulls the linkage.
REGULATOR
Service - A defective regulator, that is one which is not
simply out of adjustment, must be replaced. During re-
placement, check the hoses which connect to the regulator
and replace any which are cracked or deteriorated.
Air Filter
The air filter located in the solenoid cover should be
cleaned and re-oiled at engine oil change intervals.
1.
Snap the solenoid cover off.
2.
Remove the filter and wash it in kerosene or mineral
spirits. Squeeze it dry and wet with SAE 10 engine
oil.
Squeeze out excess oil and reinstall into the
cover.
3.
Attach the cover with neoprene seal to the solenoid
housing. Be certain that the cover fits tightly to the
housing.
One regulator adjustment is possible: Engagement-
Cruising Speed Zeroing (to remove any difference be-
tween engagement and cruising speed).
NOTE:
No regulator adjustment should be
made, however, until the following items have
been checked or serviced:
1.
Bead chain properly adjusted.
2.
All hoses in good condition, properly attached, not
leaking, not pinched or kinked.
3.
Regulator air filter clean and properly oiled.
4.
Electric and vacuum release switches properly
adjusted.
Engagement—Cruising Speed Zeroing
If the cruising speed is lower than the engagement
speed, loosen the orifice tube locknut and turn the tube
outward; if higher, turn the tube inward. Each 1/8 turn
will alter the engagement-cruising speed difference one
mph. Tighten the locknut after adjustment and check the
system operation at 50 mph.
ELECTRICAL SYSTEM CHECK OUT
1.
Check fuse and connector.
2.
Check electric brake switch as follows: Unplug con-
nector at brake switch. Connect ohmmeter at points
A and B on brake switch. The ohmmeter must indi-
cate infinity when the brake pedal is depressed and
continuity when pedal is released. The cruise re-
lease brake switch (electric) is adjusted as is the
standard stop light brake switch. Replace electric
brake switch if needed.
3.
Check engagement switch and connecting wiring as
follows: Unplug push button control connector
(brown, blue, black) at electrical wiring harness con-
nector and perform the following tests. (See Fig-
ure 10)
Test #1
—
Connect ohmmeter between terminal #1 (brown
wire) and terminal #2 (blue wire). Continuity shall be
maintained until switch is depressed all the way in.
Test #2
—
Connect ohmmeter between terminal #1 (brown
wire) and terminal #3 (black). No continuity shall be
shown; however, when the button is depressed halfway,
continuity shall be indicated. When the button is pressed
all the way down, no continuity shall be shown.
Test #3 — Connect ohmmeter between terminal #2 (blue
wire) and terminal #3 (black). Button released, no con-
tinuity; however, when the button is depressed partially
and fully, continuity shall be shown.
4.
Check regulator solenoid coil, low-speed switch, and
wiring harness as follows:
a. Disconnect engagement switch wire harness con-
nector from the main wire harness connector
(brown, blue, and black wires). Connect ohm-
meter
'
between point C (blue wire in main wire
harness) and ground. (Make sure the regulator is
well grounded to chassis.) The ohmmeter should
read 45 ohms ± 2 ohms. If a resistance of
greater value is shown, then disconnect the con-
nector from the regulator and measure the re-
sistance of the blue wire from point C to D. It
should measure 40 ohms. Check the resistance
from point E (vertical bar of terminal forming T)
to ground. It should measure 5 ohms ± 1/4 ohm.
Replace either the wiring harness or solenoid as
needed if greater values are indicated. The black
harness wiring from point F to G should also be
checked for continuity.
ENGAGEMENT SWITCH TEST
BUTTON POSITION
Cruise (released)
Engage (partially depressed)
Trim (fully depressed)
TERMINALS
1 TO 2
closed
Closed
open
1 TO 3
open
closed
open
2 TO 3
open
closed
closed
SERVO AND VACUUM SYSTEM CHECK OUT
To determine the condition of the diaphragm, remove
hoses from power unit and apply 14 inches of vacuum to
either vacuum tube opening (seal the other opening) and
hold in for one minute. The vacuum shall not leak down
more than 5 inches of vacuum in one minute. If leakage
is detected, replace servo. To utilize engine as a vac-
uum source, proceed as follows:
1.
DISCONNECT SERVO $EAD CHAIN and hoses from
servo and connect engine vacuum directly to vacuum
servo fitting (fitting in middle of servo). Seal the
servo unit opening.
2.
Note position of servo diaphragm.
3.
Start engine - the diaphragm should pull in.
4.
Clamp off engine vacuum supply line and check for
leakage. '
The cruise release brake switch (vacuum) and connecting
hoses can likewise be checked using a vacuum pump.
CHEVROLET CHASSIS SERVICE MANUAL