check engine CHEVROLET CAMARO 1967 1.G Chassis Repair 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-6

Fig.
6C-Choke Coil-V8 Engine

• Remove bracket and choke coil assembly.

WITH ROCHESTER 4MV AND

HOLLEY CARBURETORS

• Remove the choke coil shield by prying with a

screw driver in the cut out provided then lift

shield carefully over rod.

• Remove choke rod, bracket screw and choke

coil assembly
3.
Install a new choke coil assembly being sure the

locating tab is in the forward hole of the intake

manifold then install mounting screw.

4.
Complete installation as follows:

WITH ROCHESTER 2GV CARBURETOR

• Check that the choke rod eye of the coil is

below the stop tab on the bracket then install

the choke
ro and adjust if necessary.

• Install the choke coil shield over the choke coil

and move shield to best fit along manifold.

WITH ROCHESTER 4MV AND

HOLLEY CARBURETORS

• Install the choke rod and adjust as necessary

(without choke coil shield installed).

• Disconnect choke rod upper end and lower choke

coil shield over choke rod and install over choke

coil.

• Move shield to best fit along manifold and con-

nect upper end of choke rod.

5. Be sure choke valve moves freely from full open

to full closed position.

6. Start and warm up the engine and check operation

of the choke.

7. Install the air cleaner.

Throttle Linkage Adjustment (Fig. 7c or 8c)

1.
Disconnect throttle rod swivel at throttle lever on

carburetor.

2.
On automatic transmission equipped vehicles dis-

connect TV rod at throttle lever.

3.
Hold carburetor throttle in wide open position, push

throttle rod rearward (to position accelerator pedal

at the floor mat) and adjust swivel to just enter hole

in throttle lever.

4.
Connect swivel to throttle lever and install accelera-

tor return spring.

CAMARO & CHEVY II V8

CHEVELLE & CHEVROLET

V8

CAMARO
&
CHEVY
II

V8

CHEVELLE &

CHEVROLET V8
ALL SERIES

IN LINE

ALL SERIES

INLINE

Fig.
7C—Throttle Linkage—Chevrolet, Chevelle, Chevy II and Camaro

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE FUEL 6M-8

^T^l^^/'-vN

COVER
BOTTOM

Fig. 1A—Polyurethane Element Air Cleaner
OIL RESISTANCE

SEAL

BOTTOM
BONDED PAPER

ELEMENT

COVER

Fig. 2A—Paper Element Air Cleaner

SERVICE
PROCEDURES

POLYURETHANE ELEMENT

Maintenance

1.
Remove cover wing nut, cover and filter element.

2.
Visibly check the element for tears or rips and re-

place if necessary.

3.
Clean all accumulated dirt and grime from air

cleaner bottom and cover. Discard air horn to air

cleaner gasket.

4.
/Remove support screen from element and wash

element in kerosene or mineral spirits; then squeeze

out excess solvent (fig. 3A).

NOTE: Never use a hot degreaser or any sol-

vent containing acetone or similar solvent*

5.
Dip element into light engine oil and squeeze out

excess oil.
NOTE: Never shake, swing or wring the ele-

me.nt to remove excess oil or solvent as this

may tear the polyurethane material. Instead,

"squeeze" the excess from the element.

6. Install element'on screen support (fig. 4A).

7.
Using a new gasket, replace air cleaner body over

carburetor air horn.

8. Replace the element in the air cleaner. Care must

be taken that the lower lip of the element is properly

placed in the assembly and that the filter material

is not folded or creased in any manner that would

cause an imperfect seal. Take the same precautions

when replacing the cover that the upper lip of the

element is in proper position.

9.<•
Replace cover and wing nut.

OIL BATH

Maintenance

L Remove air cleaner assembly.

2.
Remove cover and filter element assembly.

Empty oil out of

accumulated dirt.
cleaner and clean out all oil and

Fig. 3A—Cleaning Polyurethane Element

Fig.
4A—Polyurethane Support

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-10

the
two
"FILL71 lines
(fig.
6A). Refill whenever
the
level

falls below the lower
<'FILL"
line.

Storing Tool

When
the
tool
is
not used, fully depress
the
inner tube.

This seals
off
the
oil
reservoir from the vent hole
to pre-

vent
oil
loss
if
the tool
is
tipped.

Fig. 6A-Filling Tool with
Oil

FUEL PUMP

INDEX

Page

General Description
. . . . 6M-10

Service Procedures .6M-10

Inspection .6M-10
Page

Test
. . ; 6M-10

Removal
6M-11

Installation
6M-11

GENERAL DESCRIPTION

The fuel pump
(fig. IP)
used
on all
Chevrolet vehicles

covered
in
this manual
are of the
diaphragm type.
The

pumps
are
actuated
by an
eccentric located on
the
engine

camshaft.
On
in-line engines,
the
eccentric actuates
the

rocker arm*
On V-8
engines,
a
push
rod
(located be-

tween
the
camshaft eccentric and fuel pump) actuates
the

pump rocker
arm.
Because
of
design, this pump
is

serviced
as an
assembly only.

Fig.
IP—Fuel Pump (Non-Serviceable)

SERVICE PROCEDURES

Inspection

The fuel pump should
be
checked
to
make sure
the

mounting bolts
and
inlet and outlet connections
are
tight.

Test

Always test pump while
it is
mounted on the engine
and
be sure there
is
gasoline
in
the tank.

The line from
the
tank
to the
pump
is the
suction side

of
the
system and the line from the pump
to the
carbure-

tor
is the
pressure side
of the
system.
A
leak on
the

pressure side, therefore, would
be
made apparent
by

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

SECTION 6T

AIR INJECTION REACTOR SYSTEM

INDEX

Page

General Description 6T-1

Maintenance Procedures 6T>1

Drive Belt. ...-..' 6T-1

Inspection 6T-1

, Adjustment . . 6T-1

Replacement 6T-1

Drive Pulley . . . . 6T-1

Replacement 6T-1

Pump Pulley ....................... 6T-1

Replacement. 6T-1

Air Manifold, Hose and Tube
...........>*.
6T-2

Inspection . . 6T-2

Replacement 6T-2

Check Valve (s) 6T-3
Page

Inspection 6T-3

Replacement . . 6T-3

Mixture Control Valve 6T-3

Inspection 6T-3

Replacement 6T-3

Air Injection Tube 6T-4

Inspection . . . ... . . . .... 6T-4

Replacement 6T-4

Air Injection Pump 6T-4

Inspection 6T-4

Replacement . 6T-4

Pressure Relief Valve Replacement 6T-4

Special Tools 6T-5

GENERAL

The Air Injection Reactor (A.I.R.) System (fig. 1) con-

sists of: the air injection pump (with necessary brackets

and drive attachments), air injection tubes (one for each

cylinder), a mixture control valve, check valves (one for

In Line engines, two for V8 engines) and air manifold as-

semblies, tubes and hoses necessary to connect the

various components.

Carburetors and distributors for engines with the

A.I.R. System are designed, particularly, for these en-

gines;
therefore, they should not be interchanged with or

replaced by a carburetor or distributor designed for an

engine without the A.I.R. System.

The air injection pump (fig. 2) picks up fresh filtered

air from the air cleaner, compresses the air and injects

it through the air manifolds, hoses and injection tubes

into the exhaust system in the area of the exhaust valves.

The fresh air ignites and burns the unburned portion of

the exhaust gases in the exhaust system, thus minimizing

exhaust contamination.

The mixture control valve (fig. 3) when triggered by a

sharp increase in manifold vacuum, supplies the intake

manifold with fresh filtered air to lean out the fuel-air
DESCRIPTION

mixture and prevent exhaust system backfire.

The check valve(s) prevent exhaust gases from entering

and damaging the air injection pump, as back flow can

occur even under normal operating conditions.

When properly installed and maintained, the A.I.R.

System will keep exhaust emissions well below require-

ments. However, if any A.I.R. component or any engine

component that operates in conjunction with the A.I.R.

system should malfunction, the exhaust emissions might

be increased.

Because of the relationship between "Engine Tune

Up"
and "Unburned Exhaust Gases", the condition of

Engine Tune Up should be checked whenever the A.I.R.

System seems to be malfunctioning. Particular care

should be taken in checking items that affect fuel - air

ratio such as the crankcase ventilation system, the

carburetor and the carburetor air cleaner.

Because of the similarity of many parts, typical illus-

trations and procedures are used except where specific

illustrations or procedures are necessary to clarify the

operation. For Repair Procedures on the Air Injection

Pump,
refer to the Passenger Chassis Overhaul Manual.

MAINTENANCE PROCEDURES

Drive Belt

Inspection

• Inspect drive belt for wear, cracks or deterioration

and replace if required.

• Inspect belt tension and adjust if below 50 lb. using a

strand tension gauge.

Adjustment

• Loosen pump mounting bolt and pump adjustment

bracket bolt.

• Move pump until belt is tight (55±5 lb. used belt or

75±5 lb. new belt using a strand tension gauge) then

tighten adjustment bracket bolt and mounting bolt.

CAUTION: Do not pry on the pump housing.

Distortion of the housing will result in extensive

damage to the Air Injection Pump.

Replacement

• Loosen pump mounting bolt and pump adjustment
bracket bolt then swing pump until drive belt may be

removed.

• Install a new drive belt and adjust as outlined above.

Drive Pulley .

Replacement

• Remove drive belt as outlined above then replace

drive pulley.

• Install and adjust drive belt as outlined above.

Pump Pulley

Replacement

• Hold pump pulley from turning by compressing drive

belt then loosen pump pulley bolts.

• Remove drive belt as outlined above then remove

pump pulley.

• Install pump pulley with retaining bolts hand tight.

CHEVROLET CHASSIS SERVICE MANUAL

AIR INJECTOR REACTOR SYSTEM
6T-3

MIXTURE

CONTROL

VALVE

SIGNAL

PUMP PRESSURE

(MIXTURE VALVE INLET)

PUMP PRESSURE

(AIR MANIFOLD INLET)

IN LINE
AIR INJECTION

PUMP INLET

MIXTURE

CONTROL

VALVE

SIGNAL

MIXTURE

CONTROL

VALVE

OUTLET

MIXTURE

CONTROL

VALVE

INLET
AIR INJECTION

PUMP INLET

V8 (TYPICAL)
PUMP PRESSURE

(AIR MANIFOLD INLET)

MIXTURE CONTROL

VALVE INLET

MIXTURE CONTROL

VALVE SIGNAL

AIR INJECTION

PUMP INLET

PUMP PRESSURE^

(AIR MANIFOLD

J

MIXTURE CONTROL

VALVE OUTLET
V8 (396-427)

Fig.
4—Air Manifold Hose and Tube Routing (Typical)
a straight pipe thread.
Do
not use
a 1/4"
tapered

pipe
tap. The
hoses
of
the
Air
Injection Reactor

System
are a
special material
to
withstand high

temperature.
No
other type hose should
be

substituted.

• Install
new
hose(s) and/or tube(s), routing them
as

when removed.

• Tighten
all
connections.

NOTE:
Use
anti seize compound
on
threads
of

the
air
manifold
to
exhaust manifold
or
cylinder

head connections.

NOTE:
On
Chevy
n
vehicles equipped with
a

V8 engine,
the air
injection tubes
are
part
of the

air manifold
and
care must
be
used
in
removing

them from
the
exhaust manifold.
It may be

necessary
to
remove
the
exhaust manifold
and

use penetrating
oil on the
injection tubes before

the
air
manifold can
be
removed.

Check Valve

Inspection

•
The
check valve should
be
inspected whenever
the

hose
is
disconnected from
the
check valve
or
when-

ever check valve failure
is
suspected. (A pump that

,
had
become inoperative and had shown indications
of

having exhaust gases
in the
pump would indicate

check valve failure)..

• Orally blow through
the
check valve (toward
air

manifold) then attempt
to
suck back through check

valve. Flow should only
be in one
direction (toward

the
air
manifold).

Replacement

• Disconnect pump outlet hose
at
check valve. Remove

check valve from
air
manifold, being careful not
to

bend
or
twist
air
manifold.

Mixture Control Valve

Inspection

• Check condition
and
routing
of all
lines especially

the signal line.
A
defective signal
or
outlet line will

cause malfunctioning
of the
mixture control valve.

• Disconnect pump
to
valve inlet hose
at
pump.

• Leaking valve will
be
indicated
by an air
gushing

noise coming from
the
hose. Place palm
of
hand over

hose; little
or no
pull with
a
gradual increase
is

normal.
If
immediate strong pull
is
felt
or air
noise

is heard, valve
is
defective
and
should
be
replaced.

• Open
and
close throttle rapidly.
Air
noise should
be

evident
and
then gradually decrease. Check
for

proper valve usage.
If
strong pull
is not
felt
im-.

mediately
or air
noise
is not
present, valve
is not

functioning properly and should be replaced.

•
A
noisy valve should be replaced.

Replacement

• Disconnect
the
signal line,
air
inlet
and air
outlet

hoses then remove
the
valve.

• Install
new
valve
and
connect
air
outlet,
air
inlet

and signal line hoses.

CAUTION: Mixture control valves, though

similar
in
appearance
are
designed
to
meet

particular requirements
of
various engines,

therefore,
be
sure
to
install
the
correct valve.

CHEVROLET CHASSIS SERVICE MANUAL

AIR INJECTOR REACTOR SYSTEM 6T-4

Air injection Tube

Inspection (Fig. 5)

• There is no periodic service or inspection for the

air injection tubes, yet on In Line engines whenever

the cylinder head is removed or on V8 engines when-

ever the exhaust manifolds are removed, inspect the

air injection tubes for carbon build up and warped or

burnt tubes.

• Remove any carbon build up with a wire brush.

• Warped or burnt tubes must be replaced.

Replacement

• On In Line engines remove carbon from tubes and

using penetrating oil, work tubes out of cylinder

head.

• On V8 engines clamp exhaust manifold in a vise,

remove carbon from tubes and using penetrating oil,

work tubes out of manifold.

• Install new tubes in cylinder head or manifold.

Air Injection Pump

Inspection

Accelerate engine to approximately 1500 KPM and

observe air flow from hose.Osf). If air flow increases as

engine is accelerated, pump is operating satisfactorily.

If air flow does not increase or is not present, proceed

as follows:

• Check for proper drive belt tension.

• Check for a leaky pressure relief valve. Air maybe

heard leaking with the pump running.

NOTE:
The Air Injection Reactor System is

not completely noiseless. Under normal condi-

tions noise rises in pitch as engine speed in-

creases. To determine if excessive noise is the

fault of the Air Injection Reactor System, oper-

ate the engine with the pump drive belt removed.

IN LINE

INJECTION

si

AIR AAANIFOLD^

ASSEMBLY
AIR MANIFOLD

ASSEMBLY ^S

~jk
VALVE

V-8

ff

>yi
INJECTION

» TUBE
' ,•

Fig.
5—Air Injection Tube (Typical)
Fig.
6-HRemoving Pressure Relief Valve

If excessive noise does not exist with the belt

removed proceed as follows:

Check for proper installation of relief valve silencer

on L-6 and 283, 327, 350 cu. in. V-8 engines.

Check for a seized Air Injection Pump.

Check hoses, tubes, air manifolds and all connec-

tions for leaks and proper routing.

Cheqk carburetor air cleaner for proper installation.

Check air injection pump for proper mounting.

If none of the above conditions exist and the air in-

jection pump has excessive noise remove then repair

as outlined in the Overhaul Manual.

Replacement

Disconnect,
t&e
hoses at the pump.

Remove pump pulley as outlined.

Remove pump mounting bolts and remove pump.

Install pump with mounting bolts loose.

Install pump pulley as outlined.

Install and adjust belt as outlined.

Connect the hoses at the pump.

Pressure Relief Valve Replacement

1.
Using J-7055-5 and J-6585 pull relief valve from

housing (fig. 6).

2.
Using a 15/16" socket tap the relief valve into hous-

ing until the valve shoulders on the housing (fig. 7).

CAUTION: Use extreme care to avoid distort-

ing housing.

NOTE:
Various length pressure setting plugs

(fig. 8) designed for the particular requirements

of vehicle - engine combinations, determine the

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE-ELECTRICAL 6Y-2

PARTITION

PLATE

STRAP

CONNECTOR

Fig.
2b—Internal View of Two Cells Showing Connector

through Partition

DRY CHARGED BATTERIES

A "dry charge" Battery contains fully charged ele-

ments which have been thoroughly washed and dried. Hiis

type of Battery contains no electrolyte until it is activated

for service in the field and, therefore, leaves the factory

in a dry state. Consequently, it is called a "dry-charge"

Battery.

Each vent well in a "dry charge" Battery has an inte-

gral hard rubber seal to prevent the entrance of air and

moisture which would oxidize the negative active mate-

rials and reduce the freshness of the Battery (fig. 3b).

The integral hard rubber seals and the sealing compound

between the case and one-piece cell cover make possible

a. vacuum sealed assembly which can be stored for very

long periods of time without detrimental effects.

Before activating the "dry charge" Battery, the inte-

gral hard rubber seals may be broken simply by pushing

the Delco Eye down into each vent well. The seals drop

into the cells, and can remain there since they are not

chemically active and will cause no harm. (The Delco

Eye is a special type of vent plug that is described in the

section entitled "Periodic Servicing".)

ACTIVATING DRY CHARGED BATTERIES

A "dry charge" Battery is activated by filling each

cell with electrolyte, which is a dilute solution of sulfuric
VENT WELL

SEAL

SPLIT VENT

Fig. 3b—Vent Well Construction Showing Seal

acid having a specific gravity of 1.265 at 80°F. The cells

are properly filled when the electrolyte level reaches

the bottom of the "split vent" at the bottom of the vent

well. The split vent is a visual level fill feature designed

into the cell cover of Delco Batteries (fig. 4b). The elec-

trolyte surface will appear distorted when it contacts the

split vent.

The electrolyte level of each cell should be checked

after filling the Battery initially. If the level has fallen

below the split vent, additional electrolyte should be

added. NEVER APD WATER TO THE ELECTROLYTE

WHEN ACTIVATING BATTERY.

Ir?ong and trouble-free service can be anticipated only

if the Battery is properly activated. Improper activation

results in poor performance and short Battery life.

After electrolyte has been added to a "dry charge"

Battery, it then becomes a wet charged Battery and

should be maintained in the same manner as any other

"wet" Battery.

WET CHARGED BATTERIES

Wet charged Batteries contain fully charged elements

and are filled with electrolyte before being shipped from

the factory.

ELECTROLYTE

LEVEL TOO

LOW
ELECTROLYTE

AT CORRECT

LEVEL

Fig. 4b-View Inside Vent Well Showing Electrolyte

CHEVROLET CHASSIS SERVICE MANUAL