1967 CHEVROLET CAMARO lock

ENGINE-ELECTRICAL 6Y-10

circuit. Make absolutely certain all connections in

the circuit are secure.

5.
Do not short across or ground any of the terminals

on the generator or regulator.

6. Do not attempt to polarize the generator.

7.
Do not disconnect lead at generator without first dis-

connecting battery ground cable.

Trouble in the A.C. charging system will usually be

indicated by one or more of the following conditions:

1.
Faulty indicator lamp or ammeter operation.

2.
An undercharged battery (usually evidenced by slow

cranking speeds).

3.
An overcharged battery (usually evidenced by exces-

sive battery water usage).

4.
Excessive generator noise or vibration.

Described below are a series of on-the-vehicle quick

checks which are designed to assist the service tech-

nician in locating troubles within the various components

of the engine electrical system. Additional checks, ad-

justments and overhaul procedures of these components

are also described in the "Charging Systems—Service

Operations Section" and should be referred to as

necessary.

STATIC CHECKS

Before making any electrical checks, perform the fol-

lowing static checks:

1.
Check for loose fan belt.

2.
Check for defective battery. (Refer to Battery).

3.
Inspect all connections, including the slip-on con-

nectors at the regulator and Delcotron.

NOTE: Do not short field to ground to check if

generator is charging since this will seriously

damage the charging system.

SYSTEM CONDITION TEST

This test is used .to indicate the overall condition of the

charging system (both good and defective) and to isolate

the malfunctioning unit if the system is defective.

NOTE: On Corvette models difficulty may be

encountered -when attempting to make the re-
quired test connections at the voltage regulator.

It is advisable to remove the regulator from its

mounting location to perform the necessary con-

nections at the regulator for the following tests

but make sure unit is grounded.

1.
With ignition off, perform the prescribed Static

Checks outlined in this section. Then set hand brake

and shift transmission
into
neutral.

2.
Connect a voltmeter from junction block relay to

ground at regulator base.

CAUTION: Be sure meter clip does not touch a

resistor or terminal extension under regulator,

3.
Connect a tachometer on engine.

4.
Models equipped with Indicator Lamp: Turn ignition

switch on "ON" position and check indicator lamp.

If lamp fails to glow, perform appropriate tests and

corrections (Indicator Lamp Circuit Tests) before

continuing.

Models equipped with Ammeter: Turn ignition

switch to "ACC" with an accessory on and check

ammeter. If ammeter fails to read discharge, check

ammeter circuit before continuing.

5.
Models equipped with Indicator Lamp: If lamp glows,

start the engine and run' it at 1500 rpm or above.

Check indicator lamp. If lamp fails to go out, per-

form appropriate test and corrections (Indicator

Lamp Circuit Test) before continuing.

Models equipped with Ammeter: If ammeter reads

discharge, start the engine and observe ammeter. If

meter fails to move toward charge (from original

position), perform appropriate test and corrections

(Field Circuit Tests) before continuing.

NOTE: At this point a field circuit has been

established and any other problem will lie in

generator or regulator.

6. Turn on high-beam headlights and heater blower

motor to high speed, run engine at or above 1500

rpm (for a few minutes, if necessary) and read the

voltage on meter.

AIR GAP

ADJUSTING NUT

ONLY

ADJUSTING SCREW

(Turn To Adjust

Voltage Setting)

Fig.
6c—Adjusting Voltage Setting

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE-ELECTRICAL 6Y-11

I
BAT
JUNCTION BLOCK
DELCOTRON

—GRQ

BATTERY

&HJVVWV

0 VA OHM TEST RELAY >

RESISTOR [ 1 d

FUSIBLE

LINK

TO CRANKING

MOTOR
Ik

REGULATOR

VOLTMETER

FUSIBLE LINK

IGN.
SWITCH

Fig.
7c—Voltage Setting Test Connections

NOTE:
Voltage will not greatly exceed 12-1/2

volts until the battery develops a surface charge,

a few minutes generally, unless the battery is

severely discharged or is hot.

If reading is:

a. 12-1/2 volts or more, turn off electrical loads,

stop engine and proceed to Step 7.

b.
Less than 12-1/2 volts, perform "Delcotron Out-

put Test-Voltmeter Method."

(1) Delcotron tests bad—refer to "Service Op-

erations" and repair Delcotron, then repeat

Step 6.

(2) Delcotron tests good—disconnect regulator

connector, remove regulator cover and recon-

nect the connector. Then repeat Step 6 and

turn voltage adjusting screw (fig. 6c) to raise

setting to 12-1/2 volts. On transistor regula-

tor remove pipe plug (fig. 6c), insert screw

driver into slot and turn clockwise one or two

notches to increase setting. Turning counter-

clockwise decreases setting. For each notch

moved, the voltage setting will change ap-

proximately .3 volt. Turn off loads, stop en-

gine and proceed to Step 7. If 12-1/2 volts

cannot be obtained, install a new regulator and

repeat Step 6.

ADJUSTING REGULATOR VOLTAGE

7. Connect a 1/4 ohm-25 watt fixed resistor (purchased

commercially) into the charging circuit at the junc-

tion block as shown in Figure 7c.

NOTE:
Between both leads and the terminal.

8. Run engine at 1500 rpm or above for at least 15

minutes of warm-up, then cycle regulator voltage

control (by disconnecting and re-connecting regulator

connector) and read voltage.

If voltage is 13.5 to 15.2, the regulator is okay.

If voltage is not within 13.5 to 15.2 volts, leave en-

gine running at 1500 rpm or above and:
a. Disconnect four terminal connector and remove

regulator cover. Then re-connect four terminal

connector and adjust voltage to i4.2 to 14.6.

(Refer to Step 6 and fig. 6c).

b.
Disconnect four terminal connector and reinstall

regulator cover, then reinstall connector.

c. Continue running engine at 1500 rpm for 5-10

minutes to re-establish regulator internal

temperature.

d. Cycle regulator voltage by disconnecting and re-

connecting regulator connector. Read voltage. A

reading between 13.5 and 15.2 indicates a good

regulator.

CAUTION: Be sure four terminal regulator

connector is disconnected when removing or in-

stalling cover. This is to prevent regulator

damage by short circuits.

DELCOTRON OUTPUT TEST

Ammeter Method (Fig. 8c)

1.
Disconnect the battery ground cable at the battery.

2.
Disconnect the red wire at Delcotron battery termi-

nal and connect an ammeter in series between the

wire and terminal.

3.
Connect a voltmeter from battery terminal to a good

ground on the generator.

4.
Disconnect the F-R terminal connector at the

Delcotron.

5. Connect the jumper wire between Delcotron "F" and

battery terminals.

6. Connect the battery ground cable at the battery.

7. Connect an adjustable carbon pile across the battery

posts.

8. Start the engine and slowly bring the speed to 1500

RPM and at the same time adjust the carbon pile

load to hold the voltage at 14 volts.

9. Read the amperage and compare with a specifications

chart.

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE-ELECTRICAL 6Y-20

cause oxidized contact points. Check for these conditions

where burned contacts are experienced. An
out-of-

balance condition in the ignition system, often the result

of too much or too little condenser capacity, is indicated

where point pitting is encountered.

REPLACEMENT

Four and Six Cylinder Engine Distributor

1.
Release distributor cap hold-down screws, remove

cap and place it out of work area.

2.
Remove rotor.

3.
Pull primary and condenser lead wires from contact

point quick disconnect terminal (fig. 4i).

4.
Remove contact set attaching screw, lift contact point

set from breaker plate.

5.
Clean breaker plate of oil smudge and dirt.

6. Place new contact point assembly in position on

breaker plate, install attaching screw.

CAUTION: Carefully wipe protective film from

point set prior to installation.

NOTE: Pilot on contact set must engage match-

ing hole in breaker plate.

7.
Connect primary and condenser lead wires to quick

disconnect terminal on contact point set. .

8. Check and adjust points for proper alignment and

breaker arm spring tension (fig. 5i). Use an aligning

tool to bend stationary contact support if points need

alignment.

NOTE: The contact point pressure must fall

within specified limits. Weak tension will cause

CONTACT SET

ATTACHING

SCREW

QUICK

DISCONNECT

TERMINAL

BREAKER PLATE

ATTACHING SCREWS
chatter, resulting in arcing and burning of-the

points and an ignition miss at high speed, while

excessive tension will cause undue wear of the

contact points, cam and rubbing block. Breaker

arm spring tension should be 19-23 ounces. The

contact point pressure should be checked with a

spring gauge. The scale should be hooked to the

breaker lever and the pull exerted at 90 degrees

to the breaker lever as shown in Figure 5i. The

reading should be taken just as the points sepa-

rate.
The pressure can be adjusted by bending

the breaker lever spring. If the pressure is ex-

cessive, it can be decreased by pinching the

spring carefully. To increase pressure,, the

lever must be' removed from the distributor so

the spring can be bent away from the lever.

Avoid excessive spring distortion.

9. Set point opening (.019" for new points).

10.
Reinstall rotor, position and lock distributor cap to

housing.

11.
$tart engine and test dwell and ignition timing.

Eight Cylinder Engine Distributor

1.
The contact point set is replaced as one complete

assembly and only dwell angle requires adjustment

after replacement. Breaker lever spring tension and

point alignment are factory set.

2.
Remove the distributor cap by placing a screw driver

in the slot head of the latch, press down and turn 1/4

turn in either direction.

3.
Remove the two attaching screws which hold the base

of the contact set assembly in place.

4.
Remove the primary and condenser leads from their

nylon insulated connection (fig. 6i) in contact set.

5.
Reverse Steps 2, 3 and 4 to install new contact set.

CAUTION:. Install the primary and condenser

leads as shown in Figure 6i. Improper installa-

tion will cause lead interference between the

cap,
weight base and breaker advance plate.

6. If car has 20,000 to 25^000 miles (or sooner if

desired) the cam lubricator wick (fig. 7i) should be

changed. Using long nosed pliers squeeze assembly

together at base and lift out. Remove all old lubri-

cant from cam surface. Replace in same manner.

Fig.
4i—Breaker Plate and Attaching Parts
Fig. 5i—-Checking Breaker Arm Spring Tension

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE-ELECTRICAL
6Y-21

Fig.
6i—Distributor Lead Arrangements

NOTE:
End of cam
lubricant wick should
be

adjusted
to
just touch
cam
lobes. Over lubrica-

tion
of cam
resulting
in
grease
on
contact points

can-
be
caused
by cam
lubrication wick bearing

too hard against
cam
surface.
A
correctly
ad-

justed
cam
lubricator wick will provide adequate

lubrication
for cam. Do not
apply additional

grease
to cam
surface.

7.
Start engine
and
check point dwell
and
ignition

timing.
ACTUAL
POINT OPENING
.021

.016
FEELER GAUGE

LOCATOR ___JH^H

(ROUND)
V~^3H|

CENTRIFUGAL
\
jdft

ADVANCE
-~-»JBlMBl

MECHANISM
«H

CAM g^k. / X

LUBRICATOR
V^^^

REPLACEMENT
^£9

^-ADJUST
SQUARELY

AND
JUST

TOUCHING
LOBE

OF
CAM
.ROTOR

I^^I^BL
LOCATOR

(PBV 7
(SQUARE)

SBSSF
/

WWjga^/
^/
LUBRICATOR

H^f
CAUTION!

S5y
NEVER
OIL

•-^
CAM
LUBRICATOR-

REPLACE
WICK

WHEN
NECESSARY
Fig.
8i—Inaccurate Gauging
of
Rough Points

SETTING DWELL ANGLE

Four
and Six
Cylinder Engine Distributors

The point opening
of new
points
can be
checked with
a

feeler gauge,
but the use of a
feeler gauge
on
rough
or

uncleaned used points
is not
recommended since accurate

mechanical gauging cannot
be
done
on
such points (fig. 8i).

Contact points must
be set to the
proper opening.

Points
set too
close
may
tend
to
burn and
pit
rapidly.

Points with excessive separation tend
to
cause
a
weak

spark
at
high speed. Proper point setting
for all

models
are:

.019"
for new
points

.016"
for
used points

New points must
be set to the
larger opening
as the

rubbing block will wear down slightly while seating
to the

cam. Contact points should
be
cleaned before adjusting
if

they have been
in
service.

LATERAL

MISALIGNMENT
PROPER

LATERAL
ALIGNMENT

pCORRECT
LATERAL MISALIGNMENT
BY

M
BENDING FIXED CONTACT SUPPORT

[NEVER
BEND BREAKER LEVER

Fig.
7i—Top View
of
Distributor

Fig.
9i—Alignment
of
Points

CHEVROLET
CHASSIS SERVICE /MANUAL

ENGINE-ELECTRICAL 6Y-22

ADJUST DWELL

ANGLE SETTING OR

POINT OPENING

Fig.
lOi—Settihg Point Opening

To adjust the contact point opening:

1.
If necessary, align points (fig. 9i) by bending the

fixed contact support. Do not bend the breaker lever.

Do not attempt to align used points; replace them

where serious misalignment is observed. Use an

aligning tool if available.

2.
Turn or crank the distributor shaft until the breaker

arm rubbing block is on the high point of the cam

lobe.
This will provide maximum point opening.

3.
Loosen the contact support lock screw.

4.
Use a screw driver (fig. lOi) to move the point sup-

port to obtain a .019" opening for new points and a

.016"
opening for used points.

5.
Tighten the contact support lock screw and recheck

the point opening.

6. After checking and adjusting the contact point open-

ing to specifications, the cam angle or dwell should

be checked with a dwell angle meter if such equip-

ment is available (see Specifications for proper dwell

angle).
If the cam angle is less than the specified

minimum, check for defective or misaligned contact

points or worn distributor cam lobes. The variation

in cam angle readings between idle speed and 1750

engine rpm should not exceed 3°. Excessive varia-

tion in this speed range indicates wear- in the

distributor.

NOTE:
Cam angle readings taken at speeds

above 1750 engine rpm may prove unreliable

on some cam angle meters.

Eight Cylinder Engine Distributor

On the Vehicle

With the engine running at idle and operating tempera-

tures normalized, the dwell is adjusted by first raising

the window provided in the cap and inserting a "Hex"

type wrench into the adjusting screw head (fig. Hi).
WINDOW

r- "HEX" TYPE

WRENCH

ADJUSTING

SCREW

Fig.
-lli—Adjusting Dwell Angle

1.

Preferred Method - Turn the adjusting screw until

the specified dwell angle is obtained as measured in

degrees (28° to 32°, 30° preferred) by a dwell angle

meter.

2.
Alternate Method - Turn adjusting screw in (clock-

wise) until the engine begins to misfire, then turn

screw 1/2 turn in the opposite direction (counter-

clockwise). This will give the approximate dwell

angle required. (Use only when meter is not

available.)

Off the Vehicle

1.
Distributor Test Method:

a. With the distributor mounted on a distributor

testing machine, connect the dwell meter to the

distributor primary lead.

b.
Turn the adjusting screw (fig. lli) to set the dwell

angle to 30 degrees.

2.
Test Light Method:

a. With the distributor mounted in a vise, connect a

testing lamp to the primary lead.

b.
Rotate the shaft until one of the circuit breaker

cam lobes is under the center of the rubbing block

of the breaker lever.

c. Turn the adjusting screw clockwise (fig. lli) until

the lamp lights, then give the wrench 1/2 turn in

the opposite direction (counter-clockwise) to ob-

tain the proper dwell angle.

DISTRIBUTOR CONDENSER

PERFORMANCE DIAGNOSIS

The following four factors affect condenser perform-

ance,
and each factor must be considered in making any

condenser test.

1.
Breakdown - A failure of the insulating material. A

direct short between the metallic elements of the

condenser. This prevents any' condenser action.

2.
Low Insulating Resistance (Leakage) - Low insula-

tion resistance prevents the condenser from holding

a charge. All condensers are subject to leakage

which, up to a certain limit, is not objectionable.

3.
High Series Resistance - Excessive resistance in

the condenser circuit due to broken strands in the

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE-ELECTRICAL 6Y-24

Fig.
13I-V-8 Distributor (Typical)-Exploded View

1.

2.

2a.

3.

4.
Condenser

Contact Point Assembly

Cam Lubricator

Retaining Ring

Breaker Plate
5.

5a.

6.

7.
Felt Washer

Plastic Seal

Vacuum Advance

Unit

Housing
8.^
Shim
Washer

9. Drive Gear Pin

10.
Drive Gear

11.
Cap

12.
Rotor
13.
Weight Springs

14.
Mainshaft

15.
Advance Weights

16.
Cam Weight

Base Assembly

When mounting distributors for tests, first secure the

gear in the test drive mechanism, then push the distribu-

tor housing downward toward the gear to take up any end

play between the gear and the housing.

NOTE:
When testing distributors that have

their lower shaft support bushing located in the

engine block (6 cylinder engines), a special

adapter should be used to insure the shaft will

run true in its housing.

Test the distributor for variation of spark, correct

centrifugal and vacuum advance and condition of contacts.

This test will give valuable information on distributor

condition and indicate parts replacement which may be

necessary. Check the area on the breaker plate just

beneath the contact points. A smudgy line indicates that

oil or crankcase vapors have been present between the

points.

Four and Six Cylinder Engines

Refer to Figure 12i.

1.
Remove the rotor.
2.

3.
Remove the vacuum control assembly retaining

screws, detach the unit from the distributor housing.

Disconnect the primary and condenser leads from the

contact point quick disconnect terminal, remove the

contact point set attaching screw, condenser attach-

ing screw. Remove the point set and condenser from

the breaker plate.

Remove the breaker plate attaching screws, remove

the breaker plate from the distributor housing (fig.

NOTE:
Do not disassemble breaker plate any

further.

5. Remove the roll pin retaining the driven gear to the

mainshaft, slide the gear from the shaft.

6. Slide the cam and mainshaft from the distributor

housing.

7. Remove the weight cover, and stop plate screws, re-

move the cover, weight springs, weights and slide

cam assembly from the mainshaft.

V-8 Engines

Refer to Figure 13i.

CHEVROLET CHASStS SERVICE MANUAL

ENGINE-ELECTRICAL 6Y-25

1.
Remove the rotor.

2.
Remove both weight springs and advance weights.

3.
Remove roll pin retaining driven gear to distributor

shaft, slide the gear and spacers from the shaft.

Remove tachometer drive gear on Corvette models.

4.
Before sliding the distributor shaft from the hous-

ing, check for and remove any burrs on the shaft.

This will prevent damage to the seals and bushing

still positioned in the housing.

5. Slide the distributor mainshaft and cam-weight base

assembly from the housing.

6. Remove vacuum advance mechanism retaining

screws, remove the vacuum advance assembly.

7. Remove the spring retainer, remove the breaker

plate assembly from the distributor housing. Re-

move the contact point and condenser from the

breaker plate. Remove the felt washer and plastic

seal located beneath the breaker plate.

CLEANING AND INSPECTION

1.
Wash all parts in cleaning solvent except cap, rotor,

condenser, breaker plate assembly and vacuum con-

trol unit. Degreasing compounds may damage insula-

tion of these parts or saturate the lubricating felt in

the case of the breaker plate assembly.

2.
Inspect the breaker plate assembly for damage or

wear and replace if necessary.

3.
Inspect the shaft for wear and check its fit in the

bushings in the distributor body. If the shaft or bush-

ings are worn, the parts should be replaced.

4.
Mount the shaft in "V" blocks and check the shaft

alignment with a dial guage. The run-out should not

exceed .002".

5. Inspect the advance weights for wear or burrs and

free fit on their pivot pins.

6. Inspect the cam for wear or roughness. Then check

its fit on the end of the shaft. It should be absolutely

free without any roughness.

7. Inspect
the •
condition of the distributor points. Dirty

points should be cleaned and badly pitted points

should be replaced. (See Distributor Contact Points.)

8. Test the condenser for series resistance, micro-

farad capacity (.18 to .23) and leakage or breakdown,

following the instructions given by the manufacturer

of the test equipment used.

9. Inspect the distributor cap and sparkplug wires for

damage and replace if necessary.

ASSEMBLY

Four and Six Cylinder Engine

Refer to Figure 12i for Exploded View of Distributor.

1.
Replace cam assembly to mainshaft.

NOTE:
Lubricate top end of shaft with Delco

cam and ball bearing grease or equivalent prior

to replacing.

2.
Install governor weights on their pivot pins, replace

weight springs. Install weight cover and stop plate.

3.
Lubricate mainshaft and install it in distributor

housing.

4.
Install distributor driven gear to mainshaft and in-

sert attaching roll pin. Check to see that shaft turns

freely.
5. Install breaker plate assembly in the distributor body

and attach retaining screws.

6. Attach condenser and contact point set in proper lo-

cation with appropriate attaching screws.

NOTE:
Contact point set pilot must engage

matching hole in breaker plate. Connect primary

and condenser leads to contact set quick-

disconnect terminal.

7. Attach vacuum control assembly to distributor

housing.

8. Check and adjust contact point opening and align-

ment (See setting and alignment of points.)

9. Check breaker lever spring tension which should

be.
19-23 ounces. (See contact point replacement.)

V-8 Assembly-(Fig. 13i)

1.
Fill housing lubricating cavity with proper compound,

press in new plastic seal and install felt washer.

2.
Replace the vacuum advance unit, install the breaker

plate in housing and install the spring retainer on

the upper bushing.

3.
Lubricate and slide weight cam over mainshaft and

install weights and spring (fig. 14i).

4.
Insert mainshaft into housing, indexing it with drive

gear and washers. Install tachometer drive gear on

Corvette models.

5. Slide distributor drive gear shims and gear over

shaft and install new pin. Tap new pin through gear

and mainshaft. Check shaft for free rotation.

NOTE:
Mainshaft end clearance should be

.002"-.007". Add or remove shims as necessary.

6. Install contact point set and condenser to breaker

plate. Connect leads as shown in Figure 6i.

NOTE:
Contact point spring tension is factory-

set above specifications to assure ease of final

adjustment. Correct tension is 19-23 oz.

7. Install rotor to cam assembly, indexing round and

square pilot holes.

Flg.
Hi-Advance Weights Installed

CHEVROLET CHASSIS SERVICE

ENGINE-ELECTRICAL 6Y-26

INSTALLATION-ENGINE NOT DISTURBED

(ALL MODELS)

1.
Turn the rotor about 1/8 turn in a clockwise direc-

tion past the mark previously placed on the distribu-

tor housing to locate rotor.

2.
Push the distributor down into position in the block

with the housing in a normal "installed" position

(fig. 15i).

NOTE: It may be necessary to move rotor

slightly to start gear into mesh with camshaft

gear, but rotor should line up with the mark

when distributor is down in place.

3.
Tighten the distributor clamp bolt snugly and con-

nect vacuum line. Connect primary wire to coil

terminal and install cap. Also install spark plug and

high tension wires if removed.

NOTE: It is important that the spark plug wires

be installed in their proper location in the

supports.

4.
Time ignition as previously described under Tune-

Up in Section 6.

INSTALLATION-ENGINE DISTURBED

(ALL MODELS)

1.
Locate No. 1 piston in firing position by either of two

methods described below,

a. Remove No. 1 spark plug and, with finger on plug

hole,
crank engine until compression is felt in the

No.
1 cylinder. Continue cranking until timing

mark on crankshaft pulley lines up with timing

tab attached to engine front cover.

b.
Remove rocker cover (left bank on V-8 engines)

and crank engine until No. 1 intake valve closes

and continue to crank slowly about 1/3 turn until
CENTRIFUGAL

jS ADVANCE

ROTATING

POLE PIECE

STATIONARY

POLE PIECE

MAGNETIC

PICKUP

ASSEMBLY

VACUUM

ADVANCE

DISTRIBUTOR

HOUSING

Fig.
151—Six Cylinder Engine Distributor
Fig.
16i—Magnetic Pulse Distributor Components

CHEVROLET CHASSIS SERVICE MANUAL