Great Wall. 4G64S4N Gasoline Engine. Service Manual - part 1

00-2

1. oil filter

2. oil drain plug

3. oil plug washer

4. oil pan

5. oil filter screen

6. oil filter screen washer

7. overflow valve plug

8. overflow valve string

9. overflow valve core

10. oil seal

11. oil pump shell

12. O-ring

13. oil pump shell cover

14. outer rotor

15. inner rotor

Dismantle steps:

Guide on Using the Manual

Maintaining Steps

(1)

Profile plots are provided for you to

understand the installation of each

component.

(2)

Use reference number of the parts to

show operation steps, mark the parts

that can not be used repeatedly (marked

as

) and the tightening torque.

Lubricating grease

[Means all-purpose lubricating grease if not

specially indicated otherwise.]

Sealant or adhesive

Engine oil or gear oil

Division of Notes for Maintaining

When there are notes for maintaining, stan-

dard value and usage of special tools, de-

tailed explanation is given.

Marks for Lubricant, Sealant and

Adhesive

Indicate in the figure of composing parts the

location where lubricant, smearing or sup-

plying of sealant and adhesive are to be

applied.

Dismantling Steps: Corresponding number of parts to the

number in the figure of composing parts to show

the dismantling steps.

Disassembly Steps: Corresponding number of parts to the

number in the figure of composing parts to show

the disassembly steps.

Mounting Steps: Mounting steps should be indicated when the

mounting may not in the reverse order with

dismantling steps. Otherwise, the mounting steps

can be omitted.

Assembly Steps: Mounting steps should be indicated when the

mounting may not in the reverse order with

dismantling steps. Otherwise, the mounting steps

can be omitted.

N

Indicates 
Notes for dismantling or disassembly

available.

Indicates  
Notes for mounting or assembly

available.

Grouping name

Section Name                                   Page

Engine

 Front cover, Oil pump

11-33

Front Cover, Oil Pump

Dismantling and Mounting

Stands for part that may not

be used repeatedly

stands for tightening torque

These numbers are corresponding to the
numbers in the steps of dismantling,
disassembly, mounting and assembly.

9EN0040

GENERAL

 GUIDE ON USING THE MANNUAL

Explanations are given for the
maintaining essentials and
notes for dismantling and
mounting, disassembly and
assembly.

These English letters corresponds to the
letters in the steps of dismantling,
mounting, disassembly and assembly.

1

13

14

15

12

11

10

1.4Kg.m

9

8

7

 4.5Kg.m

1.9

 

Kg.m

5

6

1

N

N

Smear the engine oil on all the

movement parts while assembling

E

D

A

C
B

B

A

B

A

A

MD998727

MD998727

DILD583

DILD584

Disassembly notes:

Oil pan disassembly
After you take down the bolt , disassembly the oil pan with
special tool.

A

A

00-5

VEHICLE MODEL

ENGINE

MODEL

DISPLACEMENT

TYPE

HOVER CUV

4G64-D-Y7

2,351 ML

FOUR CYLINDERS, IN-LINE, SOHC

ENGINE MODEL

OVERVIEW

 ENGINE

00-6

OVERVIEW

 TIGHTENING TORQUE

Tightening Torque

The common tightening torque is shown in the list.

Tightening torque of special parts is shown at the beginning of each group.

Tightening torque of bolts and nuts

Thread Dimension

Torque (Kg. M)

Light alloy

Cast iron, steel

NPTF

1/16

0.5  

  0.8

0.8   

  1.2

PT

1/8

0.8  

  1.2

1.5   

  2.2

PT

1/4

2.0  

  3.0

3.5   

  4.5

NPTF

1/4

2.0  

  3.0

3.5   

  4.5

PT

3/8

4.0  

  5.5

5.5   

  7.5

PT

1/2

7.0  

  10.0

12.0  

  16.0

Tightening torque of taper thread

Torque (Kg. M)

Bolt (with spring washer)

Valve bolt

Head mark 4

Head mark 7

Head mark 10

Head mark 4

Head mark 7

M6

1.0

0.9

1.3

1.1

M8

1.25

1.1

1.8

3.0

1.4

2.4

M10

1.25

2.0

3.4

6.0

3.0

5.0

M12

1.25

3.6

6.2

10.8

5.5

9.0

Diameter

of bolt

Thread

pitch

00-7

Sealant (FIPG)

Sealant is used on many parts of the engine and gearbox. The using of sealant is for the purpose of adequately sealing,

therefore, much attention should be paid to the dosage, position and the surface of sealant. Insufficient dosage of sealant

may result in leakage, while superfluous dosage of sealant may result in the overflow of sealant and jam the passage of

water or oil, or narrow the passage. So, in order to avoid leaking on the mounting surface, it is absolutely necessary to

keep the correct dosage that may keep from disconnection.

FIPG used in the engine is of Room Temperature Vulcanizing (RTV) and is provided in the way of 100-gram tube (Piece

No. MD970389, for engine use). RTV may vulcanize after reaction with the water content in the air; therefore, it is usually

used on the metal end face.

Disassembly

Components assembled with sealant may be disassembled without using a special method. However, in some cases, it

is necessary to lightly hit the components with a mallet or similar tools so as to break sealant on the coupling face, or

use a smooth thin sealant knife to hit into the joint face gently without damaging the coupling face. When dismounting

the engine oil pan, use special tool for dismounting oil pan (MD998727).

Cleaning of Sealing Surfaces

Remove rubbish on the sealing surface with a sealant knife or a steel wire brush. Be sure the sealing surface is flat and

smooth, and there isn

t any oil stain of foreign object on it. Remember to remove the sealant inside the mounting hole

and the threaded holes.

Essentials for Smearing

Matters to be taken into consideration while assembling components with FIPG.

Smear sealant equally within the prescribed diameter to cover around the mounting hole. Sealant that is not yet vulcanized

can be removed. After the installation, the sealant should be sufficiently vulcanized (approximately 1 hour or so). Do

not apply oil on the smeared part or wet or startup the engine during this period.

OVERVIEW

 SEALANT(FIGP)

11-1

page

General ........................................................................ 11-2

Specifications ............................................................... 11-3

Maintaining Standard ................................................... 11-3

Tightening Torque ........................................................ 11-5

Sealant ......................................................................... 11-7

Special Tools................................................................ 11-8

AC Generator and Ignition System .............................. 11-11

Timing Toothed-belt ..................................................... 11-14

Fuel System ................................................................. 11-23

Intake Manifold ............................................................. 11-25

Exhaust Manifold and Water Pump .............................. 11-26

Rocker Arm and Camshaft ........................................... 11-28

Cylinder Head and Valve ............................................. 11-34

Front Cover and Oil Pump ........................................... 11-40

Piston and Connecting Rod ......................................... 11-49

Crankshaft, Cylinder Block and Flywheel ..................... 11-55

AC Generator ............................................................... 11-62

Starter .......................................................................... 11-66

Throttle Body ................................................................ 11-70

Engine

Contents

11

11-2

Specifications

4G64 S4 MPI

Type

In-line OHV, SOHC

Number of Cylinders

4

Combustion Chamber

Single Pitch Roof

Total Displacement

ml

2,351

Cylinder Bore

mm

86.5

Stroke

mm

100.0

Compression Ratio

9.5

Intake valve

On

18

before top dead center

Valve Timing

Off

53 

after bottom dead center

Exhaust valve

On

50 

before bottom dead center

Off

18 

after top dead center

Lubrication system

Compression supply, full flow filtering

Type of oil pump

Gear type

Cooling system

Water cooling forced circulation

Type of water pump

Centrifugal impeller

ENGINE

 SPECIFICATION

General

Items

11-3

ENGINE

 SPECIFICATION

Specifications

Maintenance Standard

Unit

mm

Items

Standard Value

Limit Value

Convex value of tensioner arm

12

Press-in value of tensioner arm (98~196N)

 1

Height of cam

Air intake

37.39

36.89

Camshaft

Air exhaust

36.83

36.33

Shaft diameter

45.0

Planeness of Bottom Surface

0.03

0.2

Cylinder Head

Surface lapping limit*Total lapping of cylinder block and head

* 0.2

Total height

119.9

 120.1

Length of cylinder head bol

97.4

 99.4

Edge thickness

Intake

1.0

0.5

Exhaust

1.2

0.7

Diameter of valve stem

6.0

Valve

Intake

0.02

 0.05

0.10

Exhaust

0.03

 0.07

0.15

Inclination

45

 45.5

Height

Intake

112.30

111.80

Exhaust

114.11

113.61

Free Height

51.0

50.0

Valve Spring

Working pre-tightening force/Working depth  Kg/mm

27.2/44.2

Verticality

 2

 4

Contact width

0.9

 1.3

Minor diameter

6.0

Valve Guide

Major diameter

11.0

Indentation depth

14.0

Convex value of valve stem

49.3

49.8

Oil Pump

Lateral clearance

Driving gear

0.08

 0.14

Driven gear

0.06

 0.12

Piston

Piston clearance

0.02

 0.04

Lateral clearance

Ring No.1

0.02

 0.06

0.1

Ring No.2

0.02

 0.06

0.1

Piston Ring

Ring No.1

0.25

 0.35

0.8

End clearance

Ring No.2

0.40

 0.55

0.8

Oil control ring

0.10

 0.40

1.0

Major diameter

22.0

Piston Pin

Indentation force  Kg.

755

 1750

Indentation temperature

Room temperature

Crankshaft

Internal clearance of crankshaft pin

0.02

 0.05

0.1

Connecting Rod

Lateral clearance on big end

0.10

 0.25

0.4

Generator

Toothed-belt

Radial clearance between valve

stem and valve guide

11-4

Items

Standard Value

Limit Value

Axial clearance

0.05

 0.18

0.25

Crankshaft

Main shaft diameter

57

Connecting rod shaft diameter

45

Radial clearance of main shaft

0.02

 0.04

0.1

Planeness of top surface

0.05

0.1

* 0.2

Cylinder Block

Total Height

290

 0.1

Minor diameter of cylinder hole

86.50

86.53

Cylinder Block

Cylindricity of cylinder hole

0.01

Generator

Resistance of rotor coil

3

 5

0.05 O.S.

11.05

 11.07

0.25 O.S.

11.25

 11.27

0.50 O.S.

11.50

 11.52

Cylinder Head

0.30 O.S.

34.435

 34.455

0.60 O.S.

34.735

 34.755

0.30 O.S.

31.935

 31.955

0.60 O.S.

 32.235

 32.255

Top surface lapping limit*Total lapping

of cylinder block and head

Secondary processing dimension of the

enlarging of mounting hole of valve guides

(intake valve and exhaust valve)

Secondary processing dimension of the

enlarging of round hole of intake valve seat

Secondary processing dimension of the en-

larging of round hole of exhaust valve seat

Remarks:

O.S.: Diameter increased

ENGINE

 SPECIFICATION

11-5

ENGINE

 SPECIFICATION

Tightening Torque

Fastening Location

Torque (Kg.M)

Generator and Ignition System

Fastening bolt of AC generator

2.4

Stay bolt

2.4

Pivot nut

2.3

Crankshaft pulley bolt

2.5

Spark plug

2.5

Ignition coil bolt

1.1

Timing toothed-belt

Lower front cover of timing toothed-belt

1.1

Tensioning pulley bolt

4.9

Tensioning wheel arm bolt

2.2

Automatic tensioning wheel bolt

2.4

Central pulley bolt

3.6

Tensioning wheel bracket

4.9

Rear cover of timing toothed-belt

1.1

Timing belt indicator

0.9

Toothed-belt wheel of oil pump

5.5

Crankshaft toothed-belt wheel bolt

12.0

Tensioner  

B

1.9

Toothed-belt wheel of balancing shaft

4.6

Camshaft toothed-belt wheel bolt

9.0

Toothed-belt wheel of balancing shaft

4.6

Fuel System

Throttle

1.9

Fuel distributing pipe assembly

1.2

Intake manifold

Eye bolt of engine

1.9

Cooling water temperature sensor plug of engine

3.0

Water outlet port coupling bolt

2.0

Intake manifold bolt

2.0

Water temperature sensor

3.0

Exhaust manifold

Exhaust manifold cover bolt

1.4

Water inlet port coupling bolt

2.4

Exhaust manifold nut (M8)

3.0

Exhaust manifold nut (M10)

5.0

Cooling water bypass pipe connector bolt

2.4

Cooling water pipe assembly bolt

1.3

Thermostat shell bolt

2.4

Water pump bolt

1.4

Rocker Arm and Camshaft

Rocker cover bolt

0.4

Rocker arm and camshaft assembly bolt

3.2

Thrust cover screw

1.9

Cylinder head and valve

Cylinder head bolt

2.0

 90
 90

11-6

ENGINE

 SPECIFICATION

A New Tightening Method

 Bolt Tightening at Plasticity Area

A new tightening method

 bolt tightening at plasticity area will be used in some parts of engine. Different from

traditional tightening method, the use limit stated herein shall be followed while tightening the bolts.

 This method shall be applied to the following bolts:

 (1) Cylinder head bolt

 (2) Main bearing cap bolt

 (3) Connecting rod bolt

 Tightening method:

Screw the bolt till the prescribed torque is reached, then tighten another 90

100
(for cylinder head bolt, 2 90

is needed). When the area is different, the method is also different. The methods stated herein shall be followed.

Fastening Location

Torque (Kg.M)

Front cover and oil pump

Oil drain plug

4.5

Oil pan

0.7

Oil suction filter bolt and nut

1.9

Oil pressure switch

1.0

Pressure relief plug

4.5

Oil suction filter bracket bolt

1.9

Front cover bolt

2.4

Plug

2.4

Flange bolt

3.7

Oil pump cover bolt

1.6

Oil pump cover screw

1.0

Piston and connecting rod assembly

Connecting rod nut

2.0

 90
100

Crankshaft, cylinder block, flywheel and drive board

Flywheel bolt

13.5

Rear cover board mounting bolt

1.1

Oil-seal retainer mounting bolt

1.1

Main bearing cap bolt

 2.5

 90
100

Sealant

Applying Location

Model to Use

Water outlet port coupling

MD970389 or the equivalent

Cooling water bypass pipe connector

MD970389 or the equivalent

Oil pressure switch

3M ATD No.8660 or the equivalent

Oil pan

MD970389 or the equivalent

Oil-seal retainer

MD970389 or the equivalent

Water temperature sensor

3M NUT LOCKING No.4171 or the equivalent

11-7

ENGINE

 SPECIAL TOOLS

Tools

REF. NO.

NAME

PURPOSE

MB990767

MB990938

HANDLE

Use together with MD998776

MD990685

TORQUE WRENCH

MD998162

MD998285

MD998375

MD998713

Mounting of camshaft oil seal

MD998719

PULLEY FIXING PIN

SPECIAL TOOLS

Use MD998719 for Fastening

camshaft toothed-belt wheel

Use MD998767 for timing

toothed-belt tensioning

Disassembly and mounting of

front cover plug

SCREW-PLUG

WRENCH

CRANKSHAFT FRONT

OIL SEAL GUIDE

Use MD998375 for mounting of

crankshaft front oil seal

CRANKSHAFT FRONT

OIL SEAL ASSEMBLER

Mounting of crankshaft front

oil seal

CAMSHAFT OIL SEAL

ASSEMBLER

Use MB990767 for the fastening

of camshaft toothed-belt wheel

CRANKSHAFT PULLEY

WRENCH

11-8

Tools

REF. NO.

NAME

PURPOSE

MD998727

OIL PAN DETACHER

Disassembly of oil pan

MD998371

MD998372

MD998772

VALVE SPRING

MD998774

Mounting of valve oil seal

MD998776

MD998778

MD998780

Disassembly of piston pin

MD998781

FLYWHEEL STOPPER

MD998783

BALANCING SHAFT

BEARING PULLER

Disassembly of reverse balanc-

ing shaft front bearing

BALANCING SHAFT

BEARING PULLER

Disassembly of reverse bal-

ancing shaft rear bearing

Disassembly and mounting of

valve and related spare parts

VALVE OIL SEAL

ASSEMBLER

CRANKSHAFT REAR

OIL SEAL ASSEMBLER

Use MB990938 for mounting

of crankshaft rear oil seal

CRANKSHAFT

TOOTHED-BELT

WHEEL PULLER

Disassembly of crankshaft

toothed-belt wheel

PISTON INSTALLATION

TOOL

Fastening flywheel and driv-

ing plate

S C R E W - P L U G

WRENCH FIXER

Disassembly and mounting of

front cover screw-plug

ENGINE

 SPECIAL TOOLS

11-9

Tools

REF. NO.

NAME

PURPOSE

MB991603

MB991654

MD998440

MD998441

MD998442

Air exhausting of hydraulic lifter

MD998443

MD998705

MD998785

MD998767

Adjusting tension of timing belt

Guide limit for disassembly and

assembly of reverse balancing

shaft rear bearing (used with

MD998372 together)

Hydraulic lifter leakage-detect

test

Air exhausting of hydraulic

lifter

HYDRAULIC LIFTER

RETAINER

HYDRAULIC LIFTER

WIRE

HYDRAULIC LIFTER RE-

TAINER

Hydraulic lifter retainer while

removing and mounting rocker

shaft assembly

BALANCING SHAFT

BEARING INSTALLER

BALANCING SHAFT

BEARING PULLER

CYLINDER HEAD BOLT

WRENCH

Disassembly and mounting of

cylinder head bolt

Mounting of reverse balancing

shaft front & rear bearing

TIMING TOOTHED-BELT

STOPPER

Retaining of balancing shaft

toothed-belt wheel

TENSIONER PULLING

STEEVE

ENGINE

 SPECIAL TOOLS

LEAKAGE-DETECTING

TESTER

11-10

AC GENERATOR AND

IGNITION SYSTEM

DISASSEMBLY AND MOUNTING

1.

driving belt

2.

water pump pulley

3.

power steering pump pulley

4.

AC generator support

5.

AC generator

6.

crankshaft pulley

7.

spark plug cable

8.

spark plug

9.

ignition coll

10. front top cover of timing toothed-belt

11. ignition coil bracket

A

D

E

ENGINE

 AC GENERATOR AND IGNITIONSYSTEM

7

8

25N.m

23N.m

4

5

10

11N.m

9

25N.m

6

11

3

9

11N.m

23N.m

Disassembly Procedure

11-11

NOTES FOR DISASSEMBLY

DISASSEMBLY OF CRANKSHAFT BOLT

(1)

Fasten flywheel with special tools

(2)

Disassemble crankshaft bolt.

NOTES FOR MOUNTING

MOUNTING OF CRANKSHAFT BOLT

(1)

Fasten flywheel with special tools.

(2)

Mount crankshaft bolt.

ADJUST DRIVING BELT TENSION TO STANDARD

VALUE WITH DEFLECTION INDICATOR OR

TENSION GAUGE

STANDARD VALUE

NEW BELT ....................................................... 5.5

7.5mm

OLD BELT ........................................................ 7.5

8.5mm

STANDARD VALUE

NEW BELT ....................................................... 50

 70KG

OLD BELT ........................................................ 35

 45KG

D

E

MD998781

9EN0268

MD998781

9EN0268

100N

water pumo pulley

crankshaf

AC generator pulley

6EN0595

6EN0596

ENGINE

 TIMING TOOTHED-BELT

A

11-12

1.

front lower cover of timing thoothed-belt

2.

timing toothed-belt

3.

temsioning pulley

4.

tensioning arm

5.

automatic tensioner

6.

centrual pulley

7.

tensioning pulley bracket

8.

rear cover of timing toothed-belt

9.

timing toothed-belt indicator

10. oil pump toothed-bet wheel

TIMING TOOTHED-BELT

DISASSEMBLY AND MOUNTING

11. crakshaft bolt**

12. crankshaft toothed-belt wheel

13. flange

14. tensioner B

15. timing toothed-belt B

16. balancing shaft toothed-belt wheel

17. spacer

18. crankshaft toothed-belt wheel B

19. camshaft toothed-belt bolt

20. camshaft toothed-belt wheel

E

D

F

B

D

C

A

G

E

H

F

C

B

G

H

A

11N.m

17

16

15

45N

19N

14

13

18

8

88N

19

20

2

9

8.8N.m

10

54N.

7

6

35N.

4

22N.

12

162N.m

11

48N.

3

48N.

24N.

1

11N.m

6EN1769

ENGINE

 TIMING TOOTHED-BELT

Disassembly Procudure