Great Wall engine 4G64S4M. Manual - part 5

11-14

8EN0066

ENGINE

 TIMING TOOTHED-BELT WHEEL

MD998785

6EN0636

MD998778

6EN0637

MD990767

MD998719

6EN0668

 In case water or grease is found on these parts, check the front

cover oil-seal, camshaft oil-seal and water pump to see if there

exist leakage.

DISASSEMBLY OF BALANCING SHAFT TOOTHED-

BELT WHEEL

(1)

Fasten balancing shaft toothed-belt wheel with the tools as

shown in the figure.

(2)

Disassemble the balancing shaft toothed-belt wheel.

DISASSEMBLY OF CRANKSHAFT TOOTHED-BELT

WHEEL B

(1)

In case difficult to disassemble due to adhesion, use special

tools.

DISASSEMBLY OF CAMSHAFT TOOTHED-BELT

WHEEL BOLT

(1)

Fasten camshaft timing toothed-belt wheel with special tools.

(2)

Disassemble camshaft toothed-belt wheel bolt.

F

G

H

CHECK

TIMING TOOTHED-BELT WHEEL

Carefully check each part of the toothed-belt and replace a new

toothed-belt in case of the following damages:

(1)

The back rubber is aged and glistened, no trail left after scraping

with a finger nail, and no elasticity;

11-15

ENGINE

 TIMING TOOTHED-BELT WHEEL

(2)

There are cracks on the surface of back rubber;

(3)

There are cracks and peel-off on the surface of canvas

(4)

There are cracks at the bottom of the tooth

(5)

There are cracks on the side face of toothed-belt

(6)

The side face of toothed-belt is abnormally abraded. The normal

situation is the side face is as level as being cut with a sharp knife

(7)

Abnormal abrasion on the tooth surface.

(8)

Teeth broken off.

AUTOMATIC TENSIONER

(1)

Check automatic tensioner to see if there is leakage and replace

with a new one if necessary.

(2)

Check if there is abrasion or damages on the rod end and replace

with a new one if necessary.

cracks

canvas peel-off

side cracks

crack at bottom of tooth

1EN0249

belt margin roueded

abnormal abrasion (heat yarn of belt emposed)

8EN0067

canvas abrased ,rubber exposed

belt teeth broken off

8EN0068

6EN0280

11-16

ENGINE

 TIMING TOOTHED-BELT WHEEL

12mm

6EN0161

98~196N

rod

displacement

6EN1033

brass or aluminum vice jaw

cock

tieplate

brass or aluminum vice jaw

6EN1030

MD990767

6EN0669

MD998719

spacer

oil seal

chamfer

balancing

shafe

BEN0615

(3)

The overhang length of measuring rod. Replace if not conform

to standard.

Standard value

12mm

(4)

Measure the amount of displacement while pressing down the

rod with a force of 98~196N.

(5)

Replace the automatic tensioner if the displacement of rod is at

least 1mm lesser than the value as measured in item (3).

Standard value

 1mm

(6)

Clamp automatic tensioner with a soft jaw plier.

Notes:

Because there is screw-plug outshot at the bottom of automatic

tensioner, a flat bearing plate should be inserted between the

plier and the screw-plug to avoid them from direct contacting.

(7)

Rotate handle of plier to thrust in the rod of automatic tensioner.

Replace automatic tensioner if it can be easily thrusted in.

Certain resistance should be apperceived while thrusting in.

NOTES FOR MOUNTING

TIGHTENING OF CAMSHAFT TOOTHED-BELT

WHEEL BOLT

(1)

Fixup camshaft toothed-belt wheel with special tools.

(2)

Tighten the camshaft toothed-belt wheel bolt to the specified

torque.

MOUNTING OF SPACER

(1)

While mounting the spacer, the side with chamfer should be

towards oil-seal.

A

B

11-17

ENGINE

 TIMING TOOTHED-BELT WHEEL

TOOTHED-BELT WHEEL

(1)

Fixup balancing shaft toothed-belt wheel with the tools as

shown in the figure.

(2)

Tighten the bolt to the specified torque.

MOUNTING OF TIMING TOOTHED-BELT B

(1)

Align the marks of crankshaft toothed-belt wheel B and

balancing toothed-belt wheel separately.

(2)

Mount timing toothed-belt onto the crankshaft toothed-belt

wheel B and balancing shaft toothed-belt wheel. The

tensioning side should remain tightened.

(3)

Ensure that the centers of tensioner wheel and the bolt are as

shown in the figure.

(4)

While applying force to the tensioner side of timing toothed-

belt with your finger, move tensioner B in the direction of the

arrow. At this moment, screw up the bolt to fixup tensioner

B. Don

t let the shaft rotate together with toothed-belt

wheel thus while screwing up the bolt, otherwise the toothed-

belt will be too tight.

(5)

Confirm to align the mark on the toothed-belt with the mark

on the front cover

(6)

Press down the central part of the tensioner side of timing

toothed-belt B with your forefinger. The toothed-belt is to be

pressed down by 5~7mm.

D

C

MD998785

6EN0636

timing

mark

front cover

timing mark

DEN0602

6EN0571

tensioner B

tensioner

center

bolt center

6EN0572

timing

mark

displacement being

pressed down

6EN0573

timing

mark