1967 CHEVROLET CAMARO engine

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 6-37

Fig.
27V—Removing Camshaft

4.
Set dial indicator on zero, then rotate the damper

slowly, or attach an auxiliary starter switch and

"bump" the engine over, until the push rod is in the

fully raised position.

CAUTION: 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 dam-

aged grounding circuit in the ignition switch.

5.
Compare the total lift recorded from the dial indica-

tor with specifications.

6. Continue to rotate the crankshaft until the indicator

reads zero. This will be a check on the accuracy of

the original indicator reading.

7.
If camshaft readings for all lobes are within specifi-

cations, remove dial indicator assembly.

8. Install and adjust valve mechanism as outlined.

Removal

1.
Remove valve lifters as outlined.

2.
Remove crankshaft front cover as outlined.

3.
Remove grille as outlined in Section 13.

4.
Remove fuel pump push rod as outlined * in Sec-

tion 6M.

5.
Complete camshaft removal as follows:

CAUTION: All camshaft journals are the same

diameter and care must be used in removing

camshaft to avoid damage to bearings.

Remove camshaft sprocket to camshaft bolts then

remove sprocket and timing chain together. Sprocket

is a light fit on camshaft. If sprocket does not come

off easily a light blow on the lower edge of the

sprocket (with a plastic mallet) should dislodge the

sprocket.

Install two 5/16" - 18 x 4" bolts in camshaft bolt

holes then remove camshaft (fig. 27V).

Installation

NOTE: Whenever a new camshaft is installed
CONVERTER

BOLT AREA -

DEPRESSED

SYNCHROMESH
RING

GEAR

TRANS.,

AUTOMATIC

Fig.
28V - Flywheel Installation (Typical)

coat camshaft lobes with Molykote or its

equivalent.

1.
Lubricate camshaft journals with engine oil and in-

stall camshaft.

2.
Install timing chain on camshaft sprocket. Hold the

sprocket vertical with the chain hanging down, and

orient to align marks on camshaft and crankshaft

sprockets. Refer to Figure 20V.

3.
Align dowel in camshaft with dowel in hole in cam-

shaft sprocket then install sprocket on camshaft.

Refer to Figure 25V.

4.
Draw the camshaft sprocket onto camshaft using the

mounting bolts. Torque to specifications.

5.
Lubricate timing chain with engine oil.

6. Install fuel pump push rod as outlined in Section 6M.

7.
Install grille as outlined in Section 13.

8. Install crankcase front cover as outlined.

9. Install valve lifters as outlined.

FLYWHEEL

Removal

With transmission and/or clutch housing and clutch

removed from engine, remove the flywheel.

Installation

1.
Clean the mating surfaces of flywheel and crankshaft

to make certain there are no burrs.

2.
Install flywheel on crankshaft and position to align

dowel hole of crankshaft flange and flywheel (fig.

28V).

NOTE: On Automatic Transmission equipped

engines, the flywheel must be installed with the

flange collar to transmission side (fig. 33V).

ENGINE MOUNTS

Engine mounts (fig. 34V) are the nonr adjustable type

and seldom require service. Broken or deteriorated

mounts should be replaced immediately, because of the

added strain placed on other mounts and drive line

components.

Front Mount Replacement

1.
Remove nut, washer and engine mount through-bolt.

2.
Raise engine to release weight from mount.

3.
Remove mount from engine.

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE
6-38

4.
Install new mount on engine.

5. Lower engine, install through-bolt and tighten all

mount bolts to specified torques.

Rear Mount Replacement

1.
Remove crossmember-to-mount bolts.

2.
Raise transmission to release weight from mount.
3.
Remove mount-to-transmission bolts, then remove

mount (and spacer on Chevrolets).

4.
Install new mount (and spacer on Chevrolets) on

transmission.

5. While lowering transmission, align and start cross-

member-to-mount bolts.

6. Lower transmission and tighten all mounting bolts

to specified torques.

CHEVELLE
CHEVY
II

FRONT

REAR
CORVETTE

FRONT

REAR
CAMARO

FRONT

REAR

Fig.
29V -
Engine Mounts

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE 6-39

CYLINDER HEAD TORQUE SEQUENCE

L6
L4

V8-283-327 & 350
V8^396 & 427

INTAKE MANIFOLD TORQUE SEQUENCE

FRONT

V8-283 & 327
FRONT

o
o

V8-396 & 427

Fig.
IT - Torque Sequence

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE 6-40

SPECIAL TOOLS

Fig.
2T - Engine Special Tools

1. J-4536

2.
J-1264

J-8058

J-5853

3.
J-8087

4.
J-8001

5.
J-7316

6. J-8037

7.
J-8020

J-8021

J-8032

J-22249

J-22147

J-22250

8. J-6994

9. J-9510

10.
J-5239

J-6305

J-8062

J-8101

J-5830

J-7049

14.
J-8089
11.

12.

13.
Engine Lift Kit

(0-200 ft. Ib.) Torque Wrench

(0-50 ft. Ib.) *

(0.-100 in. Ib.)

Indicator Set (Cylinder Bore)

Indicator Set (Universal)

Belt Tension Gauge

Piston Ring Compressor

(3 9/16") Piston Ring Expander

(3 7/8")

(4")

(3 15/16")

(4 3/32")

(4 1/4")

Piston Pin Assembly Tool

Piston Pin Assembly Tool

(3/8") Connecting Rod Guide Set

01/32") m

Valve Spring Compressor

Valve Guide Cleaner

(11/32") Valve Guide Reamer Set

(3/8")

Carbon Removing Brush
. 15. J-5860

16.
J-5715

J-6036

17.
J-6880

18.
J-5802

19.
J-9534

20.
J-9535

21,
J-22144

22.
J-8369

23.
J-6098

24.
J-0971

25.
J-6978

26.
J-22197

27.
J-21058

28.
J-1619

29.
J-5825

30.
J-8105

31.
J-5590

32.
J-0966

33.
J-21742

34.
J-22102

35.
J-8340

36.
J-5595
Cylinder Head Bolt Wrench

(.003") Rocker Arm Stud Reamer

(.013")

Rocker Arm Stud Installer

Rocker Arm Stud Remover

Distributor Lower Bushing Remover

Distributor Lower Bushing Installer

Oil Pick-up Screen Installer

Oil Pick-up Screen Installer

Cam Bearing Tool

Camshaft Gear Support

Torsional Damper Puller

Torsional Damper Installer

Torsional Damper and Sprocket Installer

Crankshaft Sprocket Puller

Crankshaft Sprocket Puller

Crankshaft Gear Puller

Crankshaft Sprocket or Gear Installer

Crankcase Cover Centering Gauge

Crankcase Cover Centering Gauge

Crankcase Cover Tool

Grankcase Cover Seal Installer

Crankcase Cover Seal Installer

CHEVROLET CHASSIS SERVICE MANUAL

SECTION 6K

ENGINE COOLING

INDEX

Page

General Description . . . 6K-1

Maintenance and Adjustments 6K-1

Coolant Level 6K-1

Coolant System Checks 6K-1

Periodic Maintenance 6K-2

Cleaning 6K-2

Reverse Flushing 6K-2

Radiator 6K-2
Page

Cylinder Block and Cylinder Head 6K-2

Hot Water Heater 6K-2

Fan Belt . 6K-2

Adjustment ....". 6K-2

Thermostat . 6K-2

Replacement 6K-2

Water Pump. . . . 6K-3

Removal 6K-3

Installation 6K-3

GENERAL DESCRIPTION

A pressure cooling system is provided for on all

models by a pressure type radiator cap (fig. 1). The

pressure type radiator cap used is designed to hold a

pressure above atmospheric pressure in the cooling

system. Excessive pressure is relieved by a valve within

the cap that opens to radiator overflow.

The water pump is a ball bearing, centrifugal vane

impeller type. It requires no care other than to make

certain the air vent at the top of the housing and the drain

holes in the bottom do not become plugged with dirt or

grease. Removal and installation of the water pump is

covered in this section. For overhaul procedures of the

water pump refer to Section 6K of the Passenger Chassis

Overhaul Manual.
For radiator, refer to Section 13 of this manual For

radiator shroud, refer to Section 11 of this manual.

Fig.
I—Pressure Radiator Cap

MAINTENANCE AND ADJUSTMENTS

Coolant Level

The radiator coolant level should only be checked when

the engine is cool, particularly on cars equipped with air

conditioning. If the radiator cap is removed from a hot

cooling system, serious personal injury may result

The cooling system fluid level should be maintained

one inch below the bottom of the filler neck of the radia-

tor when cooling system is cold, or at the bottom of the

filler neck when the system is warm. It is very impor-

tant that the correct fluid level be maintained. The seal-

ing ability of the radiator cap is affected when the cooling

level is too high.

All passenger car cooling systems are pressurized

with a pressure cap which permits safe engine operation

at cooling temperatures of
up
to 247°F.

When the radiator cap is removed or loosened, the

system pressure drops to atmospheric, and the heat

which had caused water temperature to be higher than

212°F, will be dissipated by conversion of water to

steam. Inasmuch as the steam may form in the engine

water passages, it will blow coolant out of the radiator

upper hose and top tank, necessitating coolant replace-

ment Engine operating temperatures higher than the

normal boiling point of water are in no way objectionable

so long as the coolant level is satisfactory when the

engine is cooL

Upon repeated coolant loss, the pressure radiator cap

and seat should be checked for sealing ability. Also, the
cooling system should be checked for loose hose con-

nections, defective hoses, gasket leaks, etc.

Coolant System Checks

1.
Test for restriction in the radiator, by warming the

engine up and then turning the engine off and feeling

the radiator. The radiator should be hot at the top

and warm at the bottom, with an even temperature

rise from bottom to top. Cold spots in the radiator

indicate clogged sections.

2.
Water pump operation may be checked by running the

engine while squeezing the upper radiator hose. A

pressure surge should be felt Check for a plugged

vent-hole in pump.

NOTE:
A defective head gasket may allow ex-

haust gases to leak into the cooling system.

This is particularly damaging to the cooling

system as the gases combine with the water to

form acids which are particularly harmful to

the radiator and engine.

3.
To check for exhaust leaks into the cooling system,

drain the system until the water level stands just

above the top of the cylinder head, then disconnect

the upper radiator hose and remove the thermostat

and fan belt. Start the engine and quickly accelerate

several times. At the same time note any appreci-

able water rise or the appearance of bubbles which

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