1967 CHEVROLET CAMARO air filter

CRUISE MASTER SYSTEM CHECKS

Will not engage

Does not cruise at engage-

ment speed

System hunts or pulses

System does not disengage -

with brake pedal

System applies full throtUe

when engaged

Cannot adjust speed down-

ward with Engage Button

Does not engage or engages

lower than limits referred

to in "Driver Operation"
Cause

Brake Switch Circuit Open

Fuse blown

Defective Engage Switch

Vacuum leak in Servo and/or Brake

Switch and connecting lines.

Open in wiring harness

Defective Regulator

Orifice Tube misadjusted

Bead Chain loose.

Kinked or deteriorated hoses

Dirty Air Filter

Defective and/or improperly posi-

tioned Drive Cables and/or Casing

Assemblies

Defective Regulator

Brake and/or Vacuum Switch mis-

adjusted or defective

Hoses interchanged at Servo

Defective Regulator

Defective Engagement Switch or

Wiring

Internally Misadjusted Regulator
Correction

Check connections - adjust or replace switch. Refer to

Electrical Check Out.

Replace fuse - if it blows again, check for:

1.
Engage Switch stuck in the center of travel - Refer

to Electrical Check Out.

2.
Incorrect wiring - Refer to Electrical Check Out.

3.
Short to ground - Refer to Electrical Check Out.

Make necessary corrections.

Replace as needed - Refer to Electrical Check Out.

Vacuum test and repair or replace as needed. Refer to

Servo and Vacuum System Check Out.

Repair or replace as needed.

Replace Regulator.

Adjust as required.

Tighten Bead Chain.

Repair or replace.

Service as required.

Repair or replace as needed.

Replace Regulator.

Adjust or replace as required. Refer to Servo

and Vacuum System Check Out and Electrical Check

Out.

Correct as needed.

Replace Regulator.

Replace as needed. Refer to Electrical Check Out.

Replace Regulator

ACCESSORIES 15-11

12 VOLTS D.C.
ELECTRIC BRAKE

RELEASE

IGNITION

SWITCH

ENGINE

VACUUM

TRANSDUCER

Fig.
11 - Vacuum and Electrical Diagram

AUTOMATIC LEVEL CONTROL

INDEX

Page

General Description . . 15-11

System Checks and Adjustments 15-13

Service Operation . 15-15

GENERAL DESCRIPTION

A pneumatic level control system that automatically

maintains correct rear trim height of a car under varying

load conditions, the optional automatic level control is

used only in conjunction with the Superlift Shock Absorber

option.

The Superlift Shock Absorber option alone, consists of

the two shock absorbers with pressure lines to a "Tee"

where a ill valve is located, the shocks are inflated

with (or deflated of) compressed air (at any gas station)

to obtain the vehicle level desired with any given load

change.

The automatic leveling system is added to the Superlift

Shock Absorbers and supplies its own compressed air.

The system (fig. 13) consists of a vacuum operated air

compressor with pressure regulator,
and
integral storage

tank, vacuum line to engine, air intake filter, air lines,

and a height control valve.

The COMPRESSOR is a two-stage, vacuum actuated

type, requiring no lubrication. Vacuum supply is taken

from engine carburetor base. High pressure air is
supplied to the reservoir tank by the second stage of

the two-stage compressor. The first stage intake stroke

draws air at atmospheric pressure through a oneway

check valve located in the end of the first stage housing

under the first ^tagei housing cover. On the first stage

compression stroke, the intake valve is closed and the

oneway check valve in the second stage end of the piston

is opened. This allows the air from the first stage

cylinder to flow through the hollow piston into the second

stage cylinder for jhigh pressure compression. The

second stage compression stroke closes the check valve

in the piston and opeijis the check valve in the end of the

second stage housing.

The intake and compression strokes are controlled by a

sliding distributor valive that is actuated through an arm

that is tripped by the piston as it nears the end of each

stroke. Each time the arm actuates the distributor

valve, a different set of holes are covered in the first

stage housing. The distributor valve controls the flow of

intake manifold vacuum and air under atmospheric pres-

CHEVROLET CHASSIS SERVICE MANUAL

ACCESSORIES 15-14

Deflate system through service valve and disconnect

line at pressure regulator valve. Install test gauge on

regulator valve high pressure fitting.

Inflate system through service valve to maximum

available pressure.

NOTE: If available pressure is less than 140

psi,
start engine to build-up reservoir to this

pressure.

Regulated pressure should build-up to and hold

steady at 100-130 psi on test gauge.

Check regulated pressure by momentarily (not more

than one second) depressing valve core on test gauge

arid observe gauge reading.

If regulated pressure now reads less than 100 psi,

replace regulator assembly.

If regulated pressure exceeds 130 psi, replace regu-

lator assembly.

Control Valve Test

Exhaust (Superlifts Inflated)

1.
Disconnect control valve lever from link.

2.
Hold lever down in exhaust position until Superlifts

deflate or for a minimum of 18 seconds.

3.
If Superlifts deflate, perform Intake Check.

4.
If Superlifts do not deflate, remove exhaust adapter

from control valve and hold lever down as in Step 2.

Replace adapter, O-ring and filter if this deflates

Superlifts.

5.
Replace control valve if none of the above steps solve

problem.

Intake (Reservoir Pressure 125 psi Minimum)

1.
Disconnect overtravel lever from link.

2.
Hold lever up in intake position until Superlifts in-

Fig.
16 - Assembly Leak Test Preparation
flate or for a minimum of fifteen seconds.

3.
If Superlifts inflate and hold, proceed to Time Delay

Check. '•

4.
If Superlifts inflate and then leak down, perform leak

test on lines and fittings and then on Superlifts and

control valve. Repair or replace as indicated.

Time Delay Test (Reservoir Pressure 125 psi Minimum)

1.
Record rear trim height of empty car (rear bumper

to ground).

2.
Add weight equivalent to two passenger load to rear

of car. Car should begin to level in 4-18 seconds.

3.
Remove weight. After 4-18 seconds car should begin

to settle.

4.
Replace valve if time delay is not within the 4-18

seconds.

Trim Adjustment—On Car

Trim adjustment should be performed with a full fuel

tank (or the equivalent in load at the rate of 6 lbs
./gal-

lon)
,
but no other load.

Abbreviated Adjustment

1.
Fill the compressor at the service valve with the

available air line pressure.

2.
Disconnect link from height control valve lever.

Move the height control valve lever upward until air

fills the Superlifts.

3.
Move lever downward and hold until air stops escap-

ing from the exhaust port of the height control valve.

The Superlifts will now automatically hold 8 to 15

PSI.
;

4.
Let lever go to its neutral position> and loosen the

lever adjustment nut.

5.
Assemble the link to the height control valve lever

and tighten the lever adjustment nut.

NOTE: Do not move control valve lever and

overtravel body while tightening nut.

Leak Tests

Compressor, Reservoir and Regulator

1.
Remove assembly intact.

2.
Connect test gauge to regulator. Inflate reservoir

through service valve to 80-110 psi.

3.
Route an 8" rubber hose between vacuum and vent

ports,
(fig. 16).

4.
Submerge in water and observe for air leaks at:

Reservoir weld seam.

Reservoir to compressor O-ring.

Regulator to compressor O-ring.

Regulator boot-defective internal.O-rihg.

Diaphragm between first and second stage housings.

' Tightening through bolts may correct the leak.

Cover gasket and retainer screw. A few bubbles here

is not a leak. A continuous stream indicates defec-

tive compressor check valves.

Service valve.

Test gauge connections.

5.
Correct any leaks detected by either tightening

screws or replacing parts.

CHEVROLET CHASSIS SERVICE MANUAL

ACCESSORIES 15-16

Fig.
17 - Compressor, Regulator and Reservoir - Exploded View

1.
Regulator Assembly

2.
Adapter Assembly

3. Boot

4.
Sleeve

5. Piston

6. Spring

7. Retainer

8. "O" Ring

9. Valve Core

10..
Retainer, Screen

11.
Screen, Filter

12.
Adapter Assembly

13.
Adapter

14.
Valve Core

15.
"O" Ring

16..
Cap

17.
Screw, Regulator Retaining

18.
"O" Ring, Regulator to

Compressor
19.
Reservoir

20.
"O" Ring, Reservoir to

Compressor

21.
Thru Bolt, Reservoir

Retaining

22.,
Nut, Thru .Bolt Reservoir

23.
Thru Bolt, Compressor

Retaining

24.
Nut, Thru Bolt Compressor

25.
Compressor Assembly

26.
Housing, 2nd Stage

27.
Check Valve

28.
Spring

29.
Expansion Plug Retainer

30.
Housing 1st Stage

31.
Arm, Swivel

32.
Bushing

33.
Arm, Rocker .

34.
Pin, Rocker Arm Retaining
35.
Intake Valve

36,
Washer

37.
Spring, Intake Valve

Retaining

38.
Pin, Bushing

Retaining

39.
Piston Assembly

40.
Plate, Diaphragm

41.
Diaphragm

42.
Washer (.760-.765 I.D.)

43.
Retainer, Diaphragm

44.
Check Valve

45.
Spring

46.
Expansion Plug Retainer

47.
"O" Ring (.357-.367 I.D.)

48.
Seal (.569-.571)

49.
"O" Ring (.732-.742 I.D.)

50.
Seal (.943-.945)

51.
Piston
52.
Distributor Valve

53.
Bushing, Distributor Valve

54.
Washer (.160-. 163 I.D.)

55. Arm Assembly, Distributor

56. Screw

57. Spring, Valve Tension

58.
Bushing, Distributor Valve

Stop

59. Bussing, Arm Assembly

Stop

60.
Arm Actuating

61.
Spring, Arm Tension

62.
Screw, Arm Pivot

63.
Cover

64.
Gasket

65. Screw, Cover Retaining

66. Gasket, Cover

67. Mount, Flexible

68.
Adapter

NOTE: Position diaphragm retainer securely

to effect air tight seal against corprene washer.

Seals

1.
Inspect seals for evidence of excessive wear or

coring. If necessary replace seals and O-rings.

2.
Remove seals and O-rings from piston.

3.
Install new O-rings by rolling into groove. Relieve

any resulting twist.

4.
Install new seals using a piece of .020" shim stock,

(fig. 19). Make sure shim stock has no sharp edges

that may cut seal. Do not stretch seal more than
necessary to install. Seals should be installed so

they are not twisted.

Distributor Valve Mechanism and

Intake Valve (First Stage Housing)

NOTE: Actuate distributor valve with finger.

' Valve tension spring should press against dis-

tributor valve, holding it against either stop. If

valve action is not free and positive, it will be

necessary to rebuild using new parts in Distrib-

utor Valve and Arm Package. If action is free

CHEVROLET CHASSIS SERVICE MANUAL