1967 CHEVROLET CAMARO turn

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

ACCESSORIES
15-8

BROWN
BRAKE

SWITCH

+12V *

BLACK
CONNECTOR

AT FUSE BLOCK

CRUISE POSITION

BUTTON RELEASED

ENGAGE POSITION

BUTTON PARTIALLY DEPRESSED^ N. ENOAOi SWITCH

TRIM POSITION N. N. I

BUHON FULLY DEPRESSED. \ ^

BROWN

BLUE

ENGAGE SWITCH

CONFIGURATION

BLACK

BLUE

REGULATOR
- SOLENOID COIL

(5 a RESISTANCE)
9 BLACK

BLUE

REGULATOR

Fig.
10 - Wiring Diagram

Replacement

1.
Insert the switch into the turn signal knob, push the

retaining ring firmly against the switch, and push the

operating button onto the switch plunger. " .
SERVO

Service
—
H the Servo unit is found to be defective, re-

placement is required. Note the condition of the hoses

and replace any which are cracked or deteriorated.

CHEVROLET CHASSIS SERVICE MANUAL

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

ACCESSORIES 15-13

SYSTEM TEST
CHECKS AND ADJUSTMENTS

Automatic Level Control Test Gauge (Fig. 15)

A complete system test includes on and off-the-car

component tests.. '

On the car tests are:

Quick check of Automatic Level Control System

Compressor output test

Regulator test and adjustment

Control valve test

Time delay test

Line and fitting leak test

Trim adjustment

Off-the-car operations include:

Control valve replacement

Compressor repair

Component leak tests

a. Compressor, reservoir, and regulator

b.
Control valve

c. Superlifts

Quick Check-On Car (Reservoir Pressure at 150 PSI)

1.
Fill the fuel tank or simulate at the rate of 6 lbs./

gal.
- otherwise car should be empty.

2.
Turn engine off.

3.
Add a 2 passenger load to the rear bumper or tail-

gate.
Maintain the load until the -car lifts or AT

LEAST 20 SECONDS.

4.
After car lifts remove the load and observe until the

car lowers.

FILL VALVE

J-21999

CONNECTORS

Fig.
15 - Test Gauge Set J-22124
NOTE: To service the Automatic Level Con-

trol it will be necessary to secure Gauge Set

J-22124 or make up the following test gauge. If

the connectors indicated are not readily avail-

able others may be substituted.

1.
Collect the following parts:

a. Fill Valve, J-21999.

b.
A tee which has three 1/8M female taper pipe

threads.

c. An adapter which has a 1/4" female taper pipe

thread on one end and a 1/8" male taper pipe

thread on the other end.

d. Air Pressure Gauge, J-4872.

e. Two metal sleeves, rubber seals and tube nuts.

f. A length of 1/8" tubing. ~

g. Two male connectors which have a 1/8" male

taper pipe thread on one end and a 3/8-24 straight

thread male fitting on the other end.

2.
Assembly

a. Connect Fill Valve, J-21999, (female end) at male

connector 3/8-24 straight thread fitting.

b.
Connect other end of male connector to tee.

c. Connect adapter to tee.

d. Connect pressure regulator to adapter.

e. Connect second male connector to tee, (1/8 inch

male pipe thread fitting).

f. Install tubing to connector; other end of tubing

will go on unit to be checked.

NOTE:
Make certain all fittings are air tight.

Compressor Output Test—On Car

1.
With all accessories off, run the engine until fast idle

screw is off the fast idle cam. Turn off ignition.

2.
Deflate system through service valve, then remove

high pressure line at regulator adapter and connect

test gauge.

3.
Inflate reservoir to 70 psi through service valve.

4.
Observe test gauge for evidence of compressor air

leak.

5.
If leaking, proceed to leak test-compressor reser-

voir, and regulator. If not leaking, continue this

test.

6. With engine running at slow idle, observe reservoir

build-up for five minutes. Reservoir pressure should

build up to a minimum of 90 psi.

7.
If compressor fails to cycle, make sure the vacuum

and air intake lines are open and unobstructed before

removing compressor for repair.

8. If build-up is too slow, proceed to repair com-

pressor.

9. Satisfactory build-up indicates system problem to be

in the control section. However, again observe the

test gauge for evidence of an air leak and proceed

accordingly.

Regulator Test and Adjustment

Performance test the regulator with a known good com-

pressor on the car. *

CHEVROLET CHASSIS SERVICE MANUAL

SPECIFICATIONS
8

Displacement

Horsepower

VALVE SYSTEM:

Lifter

Rocker
Arm
Ratio

Valve Lash
Intake

Exhaust

Face Angle
(Int.
&
Exh.

Seat Angle
(Int. & Exh.)

Seat Runout
(Int. & Exh.)

Seat Width

Stem

Clearani

Valve

Spring

(Outer)

Valve

Spring

(Inner)

Damper
Intake

Exhaust

Production
Int.

Exh.

Service

Free Length

Pressure

lbs.
@
in.
Closed

Open

Installed Height

±1/32"

Free Length

Pressure

lbs.
@
in.
Closed

Open

Installed Height

±1/32"

Free Length

Approx,# of Coils
153

90
194

120
230

140
250

155
283

195
327

210
275

300
325

350
350

295
39e

325

350
427

385

390
400
425
435

1.75:1
Hydraulic

1.50:1

One

One
Mechanical

1.70:1

Turn Down From Zero Lash

Turn Down From Zero Lash
.022"*

.024"*
.024"*

.028"*

...••:•:••
••-•. , 45« •

46°**

.002"
(Max.)

1/32" - 1/16"

1/16" - 3/32"

.0015"-.0032"
.0010"
-.0027"

.0010"-.0027"
<0010It-.0025"

.0012
'-.0027"

Hi Limit Production
+ .001"
Intake
- .002"
Exhaust

2.08"

78-86

@

1.66"

170-180

@

1.26"
1.92"

54-64 @

170-184

@
1.33"
1.90"

1.66"

180-

192

@

1.27"

1
21/32
2.03"

.
. N.A. ' ' .

N.A."

1
5/32
2.11"

84-96

@

1.88"

210-

230

@

1.46"
2.09"

94-106

...©••

1.88"

303-327

@

1.38"

1
2.21"

69-81

@

1.88"

181-205

@

1.32"

7/8

N.A.

1.94tf

4
N.A.

N.A.
N.A.

N.A.

N.A.

1,94"

4
: •
1.94"-2.00"

3
3/4
2.12"

37-45

@

1.78"

92-110

@

1.22"

13/4

2.07'*-

1.95
»

4
1/3
2.09"

94-106

®

1.88"

303-327

@

1.38"

N.A.
.

N.A.

NJl.

1.94"-

2.00"

3 3/4

*Engine at operating temperature and running.

••Aluminum Heads 45°

CHEVROLET CHASSIS SERVICE MANUAL

CARTER
HOLLEY

Carburetor
One Barrel
YF
Four Barrel 4150

Four Barrel
4160
Two Barrel
2100

Prim.
Sec.
Prim,

Engine Displacement

(Horsepower)
153
250
194

230

250
230

250
194
327

(325)
427

(425)
327

(325
396

(350)
327

(300)

327

(350)
427

(390)
396

(350)
327

(300)

327

(350)
427

(390)
427

(400)

427

(435)
427

(400)

427

(435)
427

(400)

Transmission
Auto.
Syn.

Auto.
Syn.

Auto.
Syn.

Syn.

Syn.
Syn.
Syn.
Auto.

Syn.

All
Syn.

Auto.
Syn.

All
All
Syn.

All
Auto.

Part Number

(Mfg. Number)

i

I
sf

i
CO

52
2

1

8

Float

Level
Mechan-

ical
Primary
7/32"
.170"
.350"

170"
.350'

Secondary
.300"

.450'
.300'

Final
Use Sight Plug
Use Sight Plug

Float Drip
1-3/16"

Accelerator Pump

.015"

Idle Vent

Mechanical
.065"
.065'

Fast Idle
.025"
.035*
.025'

Final
2200
RPM
2000

RPM
2200
RPM
2000

RPM
2200
RPM

Choke, Vacuum Break
.220"
.240" .220"
.240"
,240f

.190"
.350'

.190'
.175'
.190"
.175"
.175'
,175f
.250"
.250"

Choke Unloader
.250"

.265"
.350"
.265"
.275'

.275"

Thermostat Choke
Rod
1/2
to 1 Rod
Diameter Interference

Secondary Stop
1/2 Turn After Contact

Main Meter-

ing
Jet
Primary
.096
.1015
.1015 .1023
.104
,104
#67

Secondary
#74

Metering
Rod
.0645

.047

Throttle Bore
.071

.049
.076

.051
.074

.048
.078

.051

.040
.078

.052

.045
#67

#72
#69

.073
#70

.073
#65

.076
#65

.073
#70

.073
#71

.073
#63

.076
#67

.073
#64
.076 #62

.078

.052

.045

Primary
1-11/16"
1-9/16

Secondary
1-9/16
1-3/4

1-3/4
1-9/16

1-9/16
1-1/2 1-3/4
1-1/2

i

With
Air
Injection Reactor System

#74
-
Choke Side.
#78 -
Throttle Lever Side

#82
-
Choke Side,
#80 -
Throttle Lever Side

Carburetor
One Barrel
BV
ROCHESTER

Two Barrel
2GV

©
Quadra-Jet Four Barrel
4MV

©

Engine Displacement

(Horsepower)
194
194
230
230
250
250
283

327

(210)
283

327

(210)
283

327

(210)
283

327

(210)
283

327

(210)
283

327

(210)
283

327

(210)
283

327

(210)
327

(275)

350

(295)
327

(275)

350

(295)
396

(325)

427

(385)
(325)

427

(385)
327

(275)

350

(295)
327

(275)

350

(295)
396

(325)

427

(385)
396

(325)

427

(385)

Transmission
Auto
Syn.
Auto.
Syn.
Auto.
Syn.
Auto.
Syn.
Auto.
Syn.
Auto.
Auto.
Syn.
Auto,
Syn.
Auto,
Syn.
Auto.
Syn.
Auto.
Syn.

Part Number
to

•g

Float Level
1-9/32"

3/4"
9/32"

Float Drop
1-3/4"

1-3/4"

Accelerator Pump
1-1/8'
13/32"
Inner Hole

Idle Vent
.050'
3/8'

Fast Idle
Mechanical
3 Turns After Contact

Running
2200
RPM
2000
RPM
2200
RPM
2200
RPM

Carburetor Choke
Rod
90"
.100"
.90"
.100"
.90'
.100'
.060'

.100"

Choke Vacuum Break
140"
160"
.140" .160" .140" .160"

.110"
.120" .110" .120" .110" .130" .110
,130'
160"
.200"
.160" .240'

.160'
.200"
.16(F .240'

Choke Unloader
.350"

.215"
.260"
.300"

.260'
.300"

Thermostat Choke Rod
1/2 to 1 Rod Diameter Interference
1/2 to 1 Rod Diameter Interference

Air Valve Spring
7/8 Turn

Air Valve Lockout
.015"
(Auto. Trans. Only)

Secondary Opening
75%
Min. Contact (Syn. Trans. Only)

Secondary Lockout
.010"
(Syn.
Trans. Only)

Main Meter-

ing
Jet
Primary
059"

.060'
.058"
.059"

.058"
.060"

.052"
.054"

.052"
.054"
.052"

.054'
.052"
.054'
.071'

Throttle

Bore
Primary
1-9/16"
1-7/16"
1-3/8"

Secondary
2-1/4"

Air Valve Dashpot
.015"

With
Air
Injection Reactor System

With
Air
Conditioning

SPECIFICATIONS
12

TUNE UP CHART

E

N

G

I

N

E
Type

Displacement

Horsepower

Compression ®

srp

;•

D

S

R

I

B

TT

T

o

R
Make

0.

Number
Standard

Cold

Gap

Point Dwell

Point Gap

1 ,

Arm Spring Tension

Condenser

T

I

M

j

N

G ®

Drive

Belts
Exc.

A.I.R.

AXR.
Syn.

Auto.

Syn;

Auto.

Fan & P/S

A/C Compressor

A.LR. Pump

Air Cleaner

Valve

Lash

Idle

<§>

Fuel.

Pump
Inlet
Exhaust
<§)

Exc.

A.LR.

A.LR.
Syn.

Auto.

Syn.

Auto.

Pressure

Volume

Crankcase Vent
In Line

153

90
194

120
230

140
250

155

130

AC

AC

31° -
46N

44N

• 34°
V8

283

195

150

AC 45

AC 44
327

210
275
300

160
325
350

150
350

295
396

325

350
427

385

390
400

160

AC 44

AC 43
425
435

150

AC 43N

AC C42N

.035

28° - 32°

.4)16"
(Used) .019" (New)
<

19 - 23 Ounces

4°B

4°B
4°B

4°B

2°B

4°B
4°B

4°B

4°B

4°B
28

- 32 (
yz.

19 - 23 oz.

.18 - .23 Microfarad

4°B

4°B

4°B

4ftB
4°B

4°B

0°B

4°B

50 lb. Min. 75

65 Jh. Min. 95

35 lb..Min. 5£

500
2°B

2°B

2°B

2°B
8PB

8°B

6°B'

6°B
6°B

6°B

6°B

4°A
10°B

X

ib°B

X
10PB

X

10°B

X
4°B

4°B

4°B

4°B
4°B

4°B

4°B

4°B
4°B

4°B

4°B

4°B

± 5 lbs.
(Used):
125 ± 5 lbs. (New) Using Strand '

± 5 lbs.. (Used) 140 ± 5 lbs. (New) Using Strand '

>
± 5 lbs. (Used) 75 ± 5 lbs. (New) Using Strand r

Hydraulic - One Turn Down From Zero Lash

Hydraulic - One Turn Down From Zero Lash

500

X
700*

600*

3 to
700*

500*

4-1/2
500

600
500

500

700*

600*
700

750
500

500

700

500
500

500

700

500
550

550

700

500
4°B

4°B

4°B

4°B
4°B

4°B

4°B

4°B
4°B

4°B

4°B

4°B

Tension Gauge

Tension Gauge

Tension Gauge

550

550

700

550
550

550

700

550
550

550

750

600
10°B
5°B

X

X

.022"

.024"

1000

X

X

X
.024"

.028"

750

X

750

X

5 to 6-1/2

One Pint in 30 - 45 Seconds

Service at 12,000 Miles

OD Psi at cranking speed, throttle wide open - Maximum variation, 20 lbs. between cylinders.

© At idle speed with vacuum advance line disconnected and plugged. A = A.T.D.C.; B = B.T.D.C.

® Paper Element - Service at 12,000 miles initially - Check every 6,000 miles thereafter, until replaced.

Polyurethane - Service every 12,000 miles.

Oil Bath - Change oil at regular engine oil change intervals.

® Mechanical - Set with engine at operating temperature and running.

@ Automatic Transmission - Set idle with transmission in drive.

Air Conditioned Vehicles - Set idle with air conditioning turned "ON" except on specifications indicated by *.

CHEVROLET CHASSIS SERVICE MANUAL