1967 CHEVROLET CAMARO turn

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-J2

Fig.
8c—Ammeter Method Test Connections

10.
Turn off ignition, disconnect battery ground cable,

and remove all test equipment.

11.
li the Delcotron meets the test specifications, the

problem is not in the generator.

12.
Ti the Delcotron fails to meet the test specifications,

remove it and perform bench tests and make repair

needed.

DELCOTRON DIODE AND FIELD TEST (Fig. 9c)

NOTE:
These tests will indicate good,, shorted

or open field or shorted diode but will not indi-

cate a failed open diode. If output was low and

following tests show good, refer to service op-

erations to determine cause and repair.

1.
Disconnect battery ground cable at battery.

2.
Positive diodes (Test A) connect an ohmmeter be-

tween "R" terminal and "BAT" terminal and note

Fig.
9c-Deicotron Diode and Field Test
reading, then reverse the leads at same terminals

and note this reading. Meter should read high re-

sistance in one direction and low in the other.

3.
Negative diodes (Test B) connect ohmmeter between

"R" terminal and "GRD" and note reading, then

reverse the leads and note this reading. Meter

should read high in one direction and low in the

other.

NOTE:
A high or low reading in both directions

indicates a defective diode.

4.
Open Field Check:

a. Connect an ohmmeter from "F" terminal to

"GRD"
terminal stud and note reading on the

lowest range scale. Meter should read 7 to

20 ohms.

b.
If meter reads zero or excessively high resist-

ance, the Delcotron is faulty.

5. If above tests indicate a defective Delcotron, remove

and completely check Delcotron as outlined under

''Service Operations".

INDICATOR LAMP/INITIAL FIELD

EXCITATION CIRCUIT TESTS (Fig. 10c)

On standard models the indicator lamp circuit provides

initial field excitation (causing lamp to glow). The light

is cancelled by closing the field relay which applies bat-

tery voltage to both sides of bulb (bulb goes out).

The indicator light should glow when ignition switch is

"ON"
and go out almost immediately when engine starts.

Ammeter equipped vehicles use the same initial field

excitation and control circuits as the indicator lamp ex-

cept the lamp is omitted. The continuity tests on both

type vehicles can be made as follows:

If Lamp Fails to Glow or Ammeter Fails to

Function the Possible Causes are:

1.
Faulty bulb or bulb socket.

2.
Faulty ammeter.

3.
An open circuit in wiring, regulator, or field.

4.
A shorted positive diode—(may also cause glow with

ignition switch "OFF").

TEST AS FOLLOWS:

1.
Disconnect connector from regulator and turn

ignition switch to "ON". Connect a test lamp from

connector terminal "4" to ground (fig. 10c, Step 1)

and note test lamp.

a. Lamp fails to glow—check for faulty bulb, socket

or open circuit between switch and regulator con-

nector. Repair as needed.

b.
Light goes on—failure is in regulator, Delcotron,

or wire between "F" terminals on regulator and

Delcotron. Go to Step 2.

2.
Disconnect lamp lead at ground end and connect be-

tween connector "F" and "4" terminals (fig. 10c,

Step 2), and note lamp:

a. Test Lamp glows—problem is in regulator. An

open circuit in regulator or relay is stuck dosed.

See "Service Operations" for repair.

b.
Fails to glow—problem is in wire between "F"

terminals on generator and regulator or infield

windings. Go to Step 3.

3.
Disconnect test lamp at connector "F" terminal and

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE-ELECTRICAL 6Y-13

F 2 3 4

f 2 3 4

F 2 3 4

Fig.
10c—Initial Field Excitation Circuit Tests

connect to "F" terminal on Delcotron (fig. 10c,

Step 3), and note lamp:

a. Lamp glows-an open circuit in wire between "F"

terminals—correct as needed.

b.
Fails to glow—Delcotron field has open circuit,

see "Service Operations" to repair %

If Lamp Fails to Go Out, or if Ammeter Shows

Discharge the Possible Causes are:

1.
Loose drive belt—adjust as necessary.

2.
Faulty field relay—(see relay test and adjustment).

3.
Defective Delcotron—(see Delcotron output test).

4.
At normal idle—parallel resistance wire open (see

Resistance test). On ammeter models the initial

field excitation wire to "ACC" terminal is open.

5. Switch off—positive diode shorted (see Diode test).

FIELD CIRCUIT RESISTANCE

WIRE CHECKS

The resistance wire is an integral part of the ignition

harness. However, the resistance wire is not solderable;

it must be spliced with a crimp-type connector. It is

rated at 10 ohms, 6.25 watts minimum.

The check for an open resistor or field excitation wire

(connected to the ignition switch "ACC" terminal) is as

follows:

1.
Connect a test lamp from the wiring harness con-

nector terminal "4" to ground as shown in Figure

10c (Step 1).

2.
Turn the ignition switch to the "ON" position and

note test bulb.

a. Test lamp glows—resistance is O.K.

b.
Test lamp does not glow—the resistor is open

circuited—note also that dash lamp does not glow

during this test because series resistance of the

2 bulbs causes amperage to be too low.
VOLTMETER

3 4

WIRING*
HARNESS

CONNECTOR

Fig.
11c—Testing Field Relay

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE-ELECTRICAL 6Y-14

VOLTMETER

WIRING HARNESS

CONNECTOR

Fig.
12c—Field Relay Closing Voltage Test

FIELD RELAY CHECKS AND ADJUSTMENT

To check for a faulty relay proceed as follows:

1.
Connect a voltmeter into the system at the regulator

No.
2 terminal to ground (fig. lie).

2.
Operate the engine at fast idle (1500 to 2000 rpm) and

observe voltmeter reading.

3.
If voltmeter shows zero voltage at regulator, check

circuit between No. 2 terminal on regulator to "R"

terminal on Delcotron.

4.
If voltage at regulator exceeds closing voltage
Fig.
13c—Adjusting Field Relay Closing Voltage

specification and light remains on, regulator field

relay is faulty (Refer to specifications). Check and

adjust regulator as follows:

CLOSING VOLTAGE ADJUSTMENT

•1.
Make connections as shown in Figure 12c using a 50

ohm variable resistor.

NOTE: This gives us a variable resistance in

series from a hot lead to the relay coil.

2.
Turn resistor to "open" position.

3.
Turn ignition switch off.

4.
Slowly decrease resistance and note closing voltage

of the relay. Adjust by bending heel iron in the man-

ner illustrated in Figure 13c.

OTHER HARNESS CHECKS

Other wires in the charging system harness need be

checked for continuity by use of an ohmmeter or a test

ligjit (12 Volt). Connect the test so the wire in question is

in series in the test circuit.

SERVICE OPERATIONS

Service Procedures described in this section are for

the 5.5" aluminum and 6.2" perforated stator Delcotrons

(fig. 14c). Where important differences are encountered

separate mention will be made of the two generators.

GENERATOR

REMOVAL AND INSTALLATION

1.
Disconnect the battery ground strap at battery to

prevent damaging diodes.

2.
Disconnect wiring leads at Delcotron.

3.
Remove generator brace bolt, (if power steering

equipped, loosen pump brace and mount nuts) then

detach drive belt (belts).

4.
Support the generator and remove generator mount

bolt (6.2" Delcotron uses 2 mount bolts) and remove

from vehicle.
5.
Reverse the removal procedure to install then adjust

drive belt.

PULLEY REPLACEMENT

5.5" Delcotron

Single Groove Pulley

1.
Place 15/16" box wrench on retaining nut and insert

a 5/16" alien wrench into shaft to hold shaft while

removing nut (fig. 15c).

2.
Remove washer and slide pulley from shaft.

3.
Reverse Steps 1 and
2
to install, use a torque wrench

with a crow-foot adapter (instead of box wrench) and

torque the nut to 50 ft. lbs. (fig. 16c).

Double Groove Pulley

1.
Place a 15/16" socket (with wrench flats on the drive

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-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-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