Great Wall engine 4G64S4M. Manual - part 12

11-42

ENGINE

 CYLINDER HEAD AND VALVE

bracket side

6EN0591

DEN0711

6LU0013

Inspection

Front Cover

(1)

Check whether the oil hole is blocked, and clean it where

necessary.

(2)

Inspect whether there is abrasion, damage or sintering at the

front bearing of left balancing shaft, if any, change the front

cover.

(3)

Check whether the front cover has crack or other damages, if

it has, change the front cover assembly.

Oil Seal

(1)

Check whether the lip of oil seal has abrasion or damage.

Change the oil seal if necessary.

(2)

Check whether the lip of oil seal has deterioration. Change the

oil seal where necessary.

Balancing Shaft

(1)

Check whether the oil hole is blocked.

(2)

Inspect whether the journal has sintering or damage, or

whether it interferences with the bearing. Change the balanc-

ing shaft, bearing or the front cover assembly in case any

defect is found.

Lubricating Oil Pump

(1)

Mount the gear of oil pump on the front cover, and then rotate

the gear to check whether it can runs smoothly and fixedly.

(2)

Ensure the contact face of the front cover and the gear flanks

of oil pump cover has no lophodont abrasion.

(3)

Check the side clearance.

Standard value:

Driving gear: 0.08-0.14mm

Driven gear: 0.06-0.12mm

Piston and Connecting Rod

Mount of Oil Filter

(1)

Clean the mounting face of the oil filter bracket.

(2)

Coat the engine oil on the O-ring of oil filter.

(3)

Screw in the oil filter, when the O-ring contacts the mounting

face, screw another 3/4 round (tightening moment: 1.4 kg.m)

N

11-43

ENGINE

 CYLINDER HEAD AND VALVE

DISASSEMBLY AND ASSEMBLY

Disassembly Procedure

1. connecting rod nut

2. connecting rod cap

3. connecting rod bearing

4. piston and connecting rod cluster

5. connecting rod bearing

6. first air ring

7. second air ring

8. oil ring

9. piston pin

10. piston

11. connecting rod

12. connecting rod bolt

All inside parts must be

coated with engine oil

6EN0526

G

F

A

E

D

E

C

C

B

A

B

11-44

ENGINE

 CYLINDER HEAD AND VALVE

Main Points in Disassembly

Disassembly of Connecting Rod Cap

(1)

Mark the cylinder No. on the side face of the larger end of the

connecting rod so as to ensure the correct assembly.

(2)

Put aside the dismantled connecting rod, connecting rod cap

and connecting rod bearing in order as per the cylinder No.

marked on.

Disassembly of Piston Pin

(1)

Insert the SST of compression bar from the side with arrow

mark at the piston top, then mount the guide block C at the end

of compression bar.

(2)

Keep the mark for forward face of the piston to face upwardly,

and mount the piston and connecting rod cluster on the base

seat (SST) of the assembler of piston pin.

(3)

Press the piston pin out with the pressure.

Notice:

Put aside the dismantled piston, piston pin and connecting

rod as per the cylinder No. marked on.

A

B

cylinder No.

DEN0050

Assembler for Piston Pin MD998780

pressing rod guide block B

conduit A=17.9mm

conduit A=18.9mm

conduit A=20.9mm

conduit A=21.9mm

guide block C

base seat

pressing rod

mark for forward

face

guide block C

base seat

mark for

f o r w a r d

face

7EN0390

7EN0431

11-45

ENGINE

 CYLINDER HEAD AND VALVE

Main Points for Mount

Mount of Piston Pin

(1)

Measure the following dimensions of the piston, piston pin

and connecting rod;

A) Length of inserting hole of the piston pin;

B) Width between the keyway

C) Length of piston pin

D) Width of smaller end of connecting rod.

(2)

Calculate the dimension L by substituting the letters in the

below formula with the measured dimensions:

L

[(A 
 C)
(B 
 D)] / 2

(3)

Insert the SST of compression bar in the piston pin and mount

the conduit A at the end of compression bar.

(4)

Conduct the assembly in such way that the mark for forward

face on the piston is in the same direction with that of the

connecting rod.

(5)

Coat the engine oil on the outside diameter of the piston pin.

(6)

Encase the piston pin, connecting rod and conduit cluster

assembled as Step (3) in the piston pin hole at the side with

mark for forward face with conduit A.

(7)

Screw the guide block B in the conduit A and ensure the

clearance between the guide block B and the guide block A is

the value of the sum of L calculated in Step (2) plus 3 mm..

(8)

Maintain the state that the mark for forward face of piston

faces upwardly, and mount the piston and connecting rod

cluster on the base seat of the assembler of piston pin.

(9)

Press in the piston pin with pressure. If the pressure force is

less than the standard value, Change the piston pin and the

piston cluster, or/and change the connecting rod.

Standard value: 750

1750kg

A

piston

piston pin

connecting rod

A

B

C

D

7EN0432

3mm+L

guide block B

conduit A

7EN0433

compression bar

piston pin

mark for forward face

mark for

f o r w a r d

face

conduit A

conduit B

base seat

7EN0391