ECU CHEVROLET CAMARO 1967 1.G Chassis Repair Manual

ENGINE 6-36

Fig.
23V - Installing Crankshaft Sprocket

(283,
327
and
350)

8* Draw camshaft sprocket onto camshaft, using the

three mounting bolts. Torque to bolt specifications.

9. Lubricate timing chain with engine oil.

10.
Install crankcase front cover and torsional damper

as outlined.

CAMSHAFT

Measuring Lobe Lift

NOTE: Procedure is similar to that used for

checking valve timing. If improper valve opera-

tion is indicated, measure the lift of each push

rod in consecutive order and record the

readings.

1.
Remove valve mechanism as outlined.

2.
Position indicator with ball socket adapter on push

rod (fig. 26V).

3.
Rotate the crankshaft damper slowly in the direction

of rotation until the lifter is on the heel of the cam

lobe.
At this point, the push rod will be in its lowest

position.
Fig.
25V- Installing Timing Chain

Fig.
24V - Installing Crankshaft Sprocket

(396 and 427)
Fig.
26V - Measuring Camshaft Lobe Lift

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE COOLING 6K-2

are indicative of exhaust gases leaking into the coolr

ing system.

Periodic Maintenance

Periodic service must be performed to the engine cool-

ing system to keep it in efficient operating condition.

These services should include a complete cleaning and

reverse flushing as well as a reconditioning service.

In the course of engine operation, rust and scale ac-

cumulate in the radiator and engine water jacket. The

accumulation of these deposits can be kept to a minimum

by the use of a good rust inhibitor but it should be

remembered that an inhibitor will not remove rust al-

ready present in the cooling system.

Two common causes of corrosion are: (1) air suction--

Air may be drawn into the system due to low liquid level

in the radiator, leaky water pump or loose hose con-

nections; (2) exhaust gas leakage—Exhaust gas may be

blown into the cooling system past the cylinder head

gasket or through cracks in the cylinder head and block.

Cleaning

A good cleaning solution should be used to loosen the

rust and scale before reverse flushing the cooling

system. There are a number of cleaning solutions avail-

able and the manufacturer's instructions with the particu-

lar cleaner being used should always be followed.

An excellent preparation to use for this purpose is GM

Cooling System Cleaner. The following directions for

cleaning the system applies only when this type cleaner

is-used.

1.
Drain the cooling system including the cylinder block

and then close both drain plugs.

2.
Remove thermostat and replace thermostat housing.

3.
Add the liquid portion (No. 1) of the cooling system

cleaner.

4.
Fill the cooling system with water to a level of about

3 inches below the top of the overflow pipe.

5. Cover the radiator and run the engine at moderate

speed until engine coolant temperature reaches 180

degrees.

6. Remove cover from radiator and continue to run the

engine for 20 minutes. Avoid boiling.

7. While the engine is still running, add the powder

portion (No. 2) of the cooling system cleaner and

continue to run the engine for 10 minutes.

8. At the end of this time, stop the engine, wait a few

minutes and then open the drain cocks or remove

pipe plugs. Also remove lower hose connection.

CAUTION: Be careful not to scald your hands.

NOTE:
Dirt and bugs may be cleaned out of

the radiator air passages by blowing out with air

pressure from the back of the core.

Reverse Flushing

Reverse flushing should always be accomplished after

the system is thoroughly cleaned as outlined above.

Flushing is. accomplished through the system in a direc-

tion opposite to the normal flow. This action causes the

water to get behind the corrosion deposits and force

them out.

Radiator

1.
Remove the upper and lower radiator hoses and re-

place the radiator cap,

2.
Attach a lead-away hose at the top of the radiator.
3.
Attach a new piece of hose to the radiator outlet

connection and insert the flushing gun in this hose.

4.
Connect the water hose of the flushing gun to a water

outlet and the air hose to an air line.

5. Turn on the water and when the radiator is full, turn

on the air in short blasts, allowing the radiator to

fill between blasts of air.

CAUTION: Apply air gradually as a clogged

radiator will stand only a limited pressure.

6. Continue this flushing until the water from the lead-

away hose runs clear.

Cylinder Block and Cylinder Head

1.
With the thermostat removed, attach a lead-away

hose to the water pump inlet and a length of new hose

to the water outlet connection at the top of the engine.

NOTE:
Disconnect the heater hose when re-

verse flushing engine.

2.
Insert the flushing gun in the new hose.

3.
Turn on the water and when the engine water jacket

is full, turn on the air in short blasts.

4.
Continue this flushing until the water from the lead-

away hose runs clear.

Hot Water Heater

1.
Remove water outlet hose from heater core pipe.

2.
Remove inlet hose from engine connection.

3.
Insert flushing gun and flush heater core. Care must

be taken when applying air pressure to prevent

damage to the core.

Fan Belt

Adjustment

1.
Loosen bolts at Delcotron slotted bracket.

2.
Pull Delcotron away from engine until desired ten-

sion reading is obtained with a strand tension gauge.

Refer to Section 6, "Engine Tune-Up".

3.
Tighten all Delcotron bolts securely.

Thermostat

The thermostat consists of a restriction valve actuated

by a thermostatic element. This is mounted in the hous-

ing at the cylinder head water outlet above the water

pump,
thermostats are designed to open and close at

predetermined temperatures and if not operating properly

should be removed and tested as follows.

Replacement

1.
Remove radiator to water outlet hose.

2.
Remove thermostat housing bolts and remove water

outlet and gasket from thermostat housing (fig. 2).

3.
Inspect thermostat valve to make sure it is in good

condition.

4.
Place thermostat in hot water 25° above the temper-

ature stamped on the thermostat valve.

5. Submerge the valve completely and agitate the water

thoroughly. Under this condition the valve should

open fully.

6. Remove the thermostat and place in water 10° below

temperature indicated on the valve.

7. With valve completely submerged and water agitated

thoroughly, the valve should close completely.

8. If thermostat checks satisfactorily, re-install, using

a new housing gasket.

9. Refill cooling system.

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE COOLING 6K-3

Fig.
2— Replacing Thermostat
Water Pump

Removal

1.
Drain radiator and break loose the fan pulley bolts.

2.
Disconnect heater hose, lower radiator hose and

by pass hose (as required) at water pump.

3.
Loosen Delcotron and remove fan belt then remove

fan bolts, fan and pulley.

4.
Remove pump to cylinder block bolts and remove

pump from engine.

NOTE:
On in line engines, pull the pump

straight out of the block first, to avoid damage

to impeller.

Installation

1.
Install pump assembly on cylinder block and tighten

bolts securely. Use on new pump to block gasket(s).

2.
Install pump pulley and fan on pump hub and tighten

bolts securely.

NOTE:
A guide stud (5/16"-24 x 1-1/2" bolt

with the head removed) installed in one hole of

the fan hub will aid in aligning hub, pulley and

fan.
Remove stud after starting the remaining

three bolts.

3.
Connect hoses and fill cooling system.

4.
Install fan belt and adjust as previously outlined.

5. Start engine and check for leaks.

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE FUEL 6M-5

3.
Disconnect choke rod or choke cable.

4.
Disconnect accelerator linkage.

5.
If equipped with Automatic transmission, discon-

nect TV linkage.

6. Remove carburetor attaching nuts and/or bolts and

remove carburetor.

Test Before Installation -

It is good shop practice to fill the carburetor bowl

before installing the carburetor. This reduces the strain

on the starting motor and battery and reduces the pos-

sibility of backfiring while attempting to start the engine.

A fuel pump clamped to the bench, a small supply of fuel

and the necessary fittings enable the carburetor to be

filled1 and the operation of the float and'intake needle and

seat to be checked. Operate the throttle several times

and check the discharge from the pump jets before in-

stalling the carburetor.

Installation

1.
Be certain throttle body and intake manifold sealing

surfaces are clean.

2.
Install new carburetor to manifold flange gasket (if

required).

3.
Install carburetor over manifold studs.

4.
Start vacuum and fuel lines at carburetor.

5.
Install attaching nuts and/or bolts and tighten

securely.

6. Tighten fuel and vacuum lines.

7.
Connect and adjust accelerator and TV linkage.

8. Connect choke tube or choke rod.

9. Adjust idle speed and mixture, then install air

cleaner. #

Fuel Filter Maintenance

1.
Disconnect fuel line connection at inlet fuel filter

nut.

2.
Remove inlet fuel filter nut from carburetor with a

1"
box wrench or socket.

3.
Remove filter element and spring (fig. 4c).
Fig. 5C-Choke Coil-L6 Engine

4.

Fig. 4C-Fuel Filter
Check element for restriction by blowing on cone

end, element should allow air to pass freely.

5.
Clean element by washing in solvent and blowing out.

Blow in opposite direction of fuel flow.

NOTE: Element should be replaced if plugged

or if flooding ocpurs. A plugged filter will

result in a loss of engine power or rough (pul-

sating) engine feel, especially at high engine

speeds.

6. Install element spring, then install element in car-

buretor so small section of cone faces out.

7.
Install new gasket on inlet fitting nut then install

nut in carburetor and tighten securely.

8. Install fuel line and tighten connector.

Choke Coil Replacement

L6 Engines (Fig. 5c)

1.
Remove air cleaner then disconnect choke rod upper

clip.

2.
Remove bolts attaching choke coil to manifold, then

remove choke coil and choke rod as an assembly.

3.
Disconnect choke rod from choke coil.

4.
Connect choke rod to new choke coil and install as-

sembly on manifold.

5.
Install bolts and tighten securely.

6. Adjust and connect choke rod as outlined.

7.
Start and warm-up the engine then check operation

of choke and install air cleaner.

V8 Engines (Fig. 6c)

1.
Remove air cleaner then disconnect choke rod upper

clip.

2.
Remove choke coil as follows:

WITH ROCHESTER 2GV CARBURETOR

• Remove the choke coil shield by prying with a

screw driver in the cut out provided then re-

move the choke rod.

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE FUEL 6M-9

4.
Wash body with cleaning solvent and wip dry.

5. Wash filter element by sloshing up and down in

cleaning solvent.

6. Dry filter unit with an air hose or let stand until

dry.

7. Fill body of cleaner to full mark with SAE 50 engine

oil. If expected temperatures are to be consistently

below freezing, use SAE 20 engine oil.

8. Assemble filter and cover assembly to body of

cleaner.

9. Install cleaner, making sure it fits tight and is set

down securely. \

OIL
WETTED
PAPER
ELEMENT

Replacement

1.
Remove wing nut, washer and cover.

2.
Remove paper element and discard.

3.
Remove bottom section of air cleaner and gasket

on air horn of carburetor. Discard air horn gasket.

4.
Clean bottom section of air cleaner and cover pieces

thoroughly, to remove dust and grime.

NOTE:
Check bottom section of air cleaner

seal for tears or cracks.

5. Install a new gasket on carburetor air horn and set

bottom section of air cleaner on carburetor.

6. Install new paper element on bottom section of air

cleaner with either end up.

NOTE:
Plastisol seal is the same material on

both ends.

7. Install cover, washer and wing nut.

Testing (Fig. 5A)

Tool J-7825, is designed to check paper element air

cleaners to determine whether the element has ma-

terially decreased in efficiency arid should be replaced

or has only slightly increased air restriction and is

suitable for further service. In combination with a

tachometer, this instrument will quickly and accurately

determine the air cleaner element condition.

VENT HOLE

TOWARD DASH
NOTE:
t Before testing, inspect for holes or

breaks in the element, as these defects re-

quire immediate replacement. If no holes or

breaks exist, proceed as follows:

1.
Remove all hoses and plug all openings except air

cleaner inlet.

2.
Install air cleaner, using Tool J-7825 in place of the

wing nut. Screw Tool J-7825 onto the stud until it

seals tightly against the air cleaner cover. Rotate

the entire tool so that the scale can be read from

the left side of the car. Be sure the vent hole is

toward the dash.

3.
Connect a tachometer and place it so that it may be

read simultaneously with Tool J-7825.

4.
Zero oil level in the inner tube by pulling inner tube

upward until the rubber seal is above the vent hole,

then raise or lower as' required until the inner tube

oil level is exactly to the "0" mark.

5. Start engine. If engine is cold, allow to run for 2 to

3 minutes. The automatic choke must be fully open.

6. Accelerate the engine slowly until the inner tube oil

level of Tool J-7825 just reaches the 1/4 mark.

Allow engine speed to stabilize and note tachometer

(rpm) reading. Decelerate engine.

7. If the tachometer reading is at or below the follow-

ing, the oil wetted paper air cleaner element is re-

stricted beyond the allowable limit and should be

replaced. If testing indicates that the element

restriction is satisfactory at 12,000 miles, the ele-

ment need not be replaced but should be retested

every 6,000 miles thereafter until replaced.

Engine

Displacement

283 cu.
in.

327 cu.
in.

350 cu. in.

396 cu.
in.

427 cu.
in.
Horsepower

195

210

275

300

325

350

295

325

350

385

390

425
Minimum

Allowable

RPM

2300

2100

210Q

2600

2600

1550

1950

1850

1850

2140

Fig.
5A—Testing Air Cleaner
8. Remove tachometer and Tool J-7825 from vehicle

and push down inner tube until seal is below vent

hole to prevent oil loss.

Tool J-7825

FiHing
Tool

Tool J-7825 is shipped dry and must be filled with the

red gauge oil (specific gravity .826) provided.

Pull the knurled inner tube completely out of the gauge

and add oil to the reservoir until the oil level is between

CHEVROLET CHASSIS SERVICE /MANUAL

ENGINE FUEL 6M-11

dripping fuel, but a leak on the suction would not be ap-

parent except for its effect of reducing volume of fuel on

the pressure side.

1.
Tighten any loose line connections and look for bends

or kinks in lines.

2.
Disconnect fuel pipe at carburetor. Disconnect dis-

tributor to coil primary wire so that engine can be

cranked without firing. Place suitable container at

end of pipe and crank engine a few revolutions. If

little or no gasoline flows from open end of pipe then

fuel pipe is clogged or pump is inoperative. Before

removing pump disconnect fuel pipe at gas tank and

outlet pipe and blow through them with an air hose

to make sure they are clear. Reconnect pipes and

retest while cranking engine.

CAUTION: Whenever the engine is cranked re-

motely at the starter, with a special jumper

cable or other means, the primary distributor

lead must be disconnected from the negative

post on the coil and the ignition switch must be

in the "ON" position. Failure to do this will

result in a damaged grounding circuit in the

ignition switch.

3.
If fuel flows from pump in good volume from pipe

at carburetor, check fuel delivery pressure to be

certain that pump is operating withint specified limits

as follows:

a. Attach a fuel pump pressure test gauge to dis-

connect end of pump to carburetor pipe.

b.
Run engine at approximately 450-1,000 rpm (on

gasoline in carburetor bowl) and note reading on

pressure gauge.

c. If pump is operating properly the pressure will

be within specifications and will remain constant

at speeds between 450-1,000 rpm. If pressure

is too low, too high, or varies materially at dif-

ferent speeds, the pump should be replaced.

Removal

1.
Disconnect fuel inlet and outlet pipes at fuel pump.
Fig.
2P-Installing 283, 327, 350 V8 Engine Fuel Pump

2.
Remove fuel pump mounting bolts and remove pump

and gasket.

3.
On V8 engines; if push rod is to be removed, remove

pipe plug then remove push rod (396 and 427 cu. in.

engines), remove fuel pump adapter and gasket then

remove push rod (283 and 327 cu. in. engines).

4.
If a new fuel pump is to be installed, transfer

fittings.

Installation

1.
On V8 engines; if removed, install fuel pump push

rod and pipe fitting or fuel pump adapter. Use.

gasket sealer on gasket or pipe fitting.

2.
Install fuel pump using a new gasket and tighten

securely. Use sealer on fuel pump mounting bolt

threads.

NOTE:
On V8 engines, a pair of mechanical

fingers may be used to hold fuel pump push rod

up while installing fuel pump (fig. 2P).

3.
Connect fuel pipes to pump.

4.
Start engine and check for leaks.

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE-ELECTRICAL
6Y-4

CLEANING

The external condition of the Battery should be checked

periodically for damage or for the presence of dirt and

corrosion. The top of the Battery should be kept clean.

An accumulation of acid film and dirt may permit current

to flow between the terminals, which will slowly dis-

charge the Battery. For best results when cleaning the

top of Batteries, wash first with a diluted ammonia or a

soda solution to neutralize any acid present; then flush

with clean water. Care must be taken to keep vent plugs

tight, so that the neutralizing solution does not enter the

cells.

CABLES

To insure good electrical contact, the cables should be

clean and tight on the Energizer posts. If the posts or

cable terminals are corroded, the cables should be dis-

connected and the terminals and clamps cleaned sepa-

rately with a soda solution and a wire brush. After

cleaning and installing clamps, apply a thin coating of

petroleum jelly on the cable clamps to retard corrosion.

CARRIER
AND
HOLD-DOWN

The Battery carrier and hold-down should be clean and

free from corrosion before installing the Battery. The

carrier should be in a sound mechanical condition so that

it will support the Battery securely and keep it level.

To prevent the Battery from shaking in its carrier,

the hold-down bolts should be tight (60-80 in. lbs.). How-

ever, the bolts should not be tightened to the point where

the Battery case or cover will be placed under a severe

strain.

BATTERY SAFETY PRECAUTIONS

When Batteries are being charged, an explosive gas

mixture forms in each cell. Part of this gas escapes

through the holes in the vent plugs and may form an

explosive atmosphere around the Battery itself if ventila-

tion is poor. This explosive gas may remain in or around

the Battery for several hours after it has been charged.

Sparks or flames can ignite this gas causing an internal

explosion which may shatter the Battery.

The following precautions should be observed to pre-

vent an explosion:

1.
Do not smoke near Batteries being charged or which

have been very recently charged.

2.
Do not break live circuits at the terminals- of Batr

teries because a spark usually occurs at the point

where a live circuit is broken. Care must always be

taken when connecting or disconnecting booster leads

or cable clamps on fast chargers. Poor connections

are a common cause of electrical arcs which cause

BATTERY CHARGING PROCEDURES

There are three methods of recharging Batteries.

They differ basically in the length of time the Battery is

charged and the rate at which charging current is sup-

plied. One is the Slow Charge method, the second is the

Fast Charge method, and the third is the Emergency

Boost Charge method.

Before recharging a Battery by any method, the elec-

trolyte level must be checked and adjusted if necessary.
SLOW CHARGING

The Slow Charge method supplies the Battery with a

relatively low current flow for a relatively long period of

time. This is the only method that will bring the Battery

to a full state of charge.

The Slow Charge method consists of charging at

approximately a 4 ampere rate for 24 hours or more if

necessary to bring the Battery to full charge. A fully

charged condition is reached when the cells are gassing

freely and three corrected specific gravity readings

taken at hourly intervals show no increase.

FAST CHARGING

The Fast Charge method supplies current to the Bat-

tery at a 40 to 50 ampere rate for a 1 1/2 hour period of

time. If the electrolyte temperature reaches 125°F before

the 1 1/2 hour period is completed, the Battery must be

taken off charge temporarily, or the charging rate

reduced to avoid damage to the Battery.

Although a Battery cannot be brought to a fully charged

condition during Fast Charge, it can be substantially

recharged or "boosted". In order to bring the Battery to

a fully charged condition, the charging cycle must be

finished by the Slow Charge method.

EMERGENCY BOOST CHARGING

In cases where the Battery is not sufficiently charged

to crank the engine, an emergency boost charge may be

applied as a temporary expedient in order to crank the

engine. The Emergency Boost Charge method consists of

charging at a 40 to 50 ampere rate for a period of one-

half hour.

It should be particularly noted that the Emergency

Boost Charge will not necessarily restore the Battery to

a useful state of. charge for continued service. After an

emergency boost charge, failure to charge the Battery

further, either by a long uninterrupted driving period or

by the Fast Charge or Slow Charge method, may result

in failure to crank the engine the next time cranking is

attempted. A Battery should never be condemned on the

basis of failure to crank the engine after an emergency

boost charge. Although an emergency boost charge may

put enough energy into the Battery to crank the engine

once, further charging usually is necessary in order to

create a sufficient reserve to crank a second and third

time.

12
VOLT BATTERY SUGGESTED

CHARGING RATES

(100 Amp/hr or Less Capacity)

TYPE OF

CHARGE

Boost Charge for

Light Load Test

Slow Charge

Fast Charge

Quick Boost .

Dry Charge

Warm-up Boost
LENGTH

OF TIME

20 Minutes

24 Hours

1-1/2 Hours

30 Minutes

10 Minutes
CHARGING

RATE

50 Amps

4 Amps

40-50 Amps

40-50 Amps

15 Amps

CHEVROLET CHASSIS SERVICE MANUAL

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-16

POINT
OPENINGJL

Fig. 17c-6.2"
Brush
Holder
Assembly

5. Rearrange leads as shown in Figure 18c with right-

hand brush lead connected under the right hand hex-

head stud.

6. Remove pin and attach terminal cover with two

screws, making sure leads are not caught under-

neath the cover.

DOUBLE CONTACT REGULATOR

While most regular adjustments are made on the vehi-

cle as outlined under "Maintenance and Adjustments",

the regulator may be removed for field relay point and

air gap adjustment. However, voltage regulating contacts

should never be cleaned as they are made of special

material that may be destroyed by cleaning with any

abrasive material.

NOTE:
A sooty or discolored condition of the

contacts is normal after a relatively short

period of operation.
Fig. 19c—Checking Field Relay Point Opening

REMOVAL AND INSTALLATION

To remove the regulator assembly, disconnect the bat-

tery ground cable and the wiring harness connector at the

regulator, then remove the screws securing the regulator

to the vehicle.

Electrical settings must be checked and adjusted after

making mechanical adjustments. Before installing regu-

lator cover, make sure the rubber gasket is in place on

the regulator base.

MECHANICAL ADJUSTMENTS

NOTE:
Only an approximate voltage regulator

air gap setting should be made by the "feeler

gauge" method.

BRUSH

LEAD

BRUSH

LEAD
RELAY
^B-/lliLlK
CONDENSER

LEAD
GROUND
LEAD

STUD
AIR GAP

(Check
With
Points

Just
Touching)

Fig.
18c—Lead
Arrangement
after
Assembly
Fig. 20c—Checking Field Relay Air Gap

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