Chery QQ6 (S21) / S12LHD. Manual — part 221

No.

Name

Dimension and tolerance

Fit clearance

Thickness of connecting rod big end

22

0

-0.1

4

Width of crankshaft connecting rod journal

22

+0.30

+0.15

0.15~0.4

First piston ring groove height

1.2

+0.05

+0.03

5

Top compression ring height

1.2

-0.005

-0.03

0.035~0.08

Second piston ring groove height

1.5

+0.04

+0.02

6

Second compression ring height

1.5

-0.005

-0.030

0.025~0.07

piston oil ring groove height

2.5

+0.03

+0.01

Blade height of steel strip composite type oil ring

0.46±0.02

7

Bracing spring height of steel strip composite type oil

ring

1.5±0.03

0.02~0.18

8

Crankshaft key groove width

014

.

0

010

.

0

5

+

−

9

Diameter of crankshaft front oil seal

Φ36

0

-0.1

10

Diameter of crankshaft rear oil seal

Φ75

0

-0.1

Outside diameter of engine oil dipstick tube

0

1

.

0

7

.

16

−

φ

11

Diameter of cylinder block scale tube orifice

043

.

0

0

7

.

16

+

φ

Diameter of cylinder head valve guide orifice

φ6+0.015

Outside diameter of valve guide

φ11x6

12

Diameter of cylinder head valve guide bottom orifice

φ11H7

-0.022～

-0.050

Outside diameter of intake valve stem

φ5.98±0.008

13

Diameter of cylinder head intake valve guide orifice

φ6+0.015

+0.012～

+0.043

Exhaust valve stem diameter

φ5.96±0.008

14

Diameter of cylinder head exhaust valve guide orifice

φ6+0.015

+0.032～

+0.063

Diameter of camshaft first journal

( )

050

.

0

066

.

0

6

32

−

−

e

φ

15

Diameter of cylinder head first bearing hole

+0.050～

+0.090

Diameter of camshaft second journal

( )

040

.

0

053

.

0

6

24

−

−

e

φ

16

Diameter of cylinder head second bearing hole

( )

021

.

0

0

7

24

+

H

φ

+0.040～

+0.074

17

Diameter of camshaft third journal

( )

040

.

0

053

.

0

6

24

−

−

e

φ

+0.040～

No.

Name

Dimension and tolerance

Fit clearance

Diameter of cylinder head third bearing hole

( )

021

.

0

0

7

24

+

H

φ

+0.074

Diameter of camshaft fourth journal

( )

040

.

0

053

.

0

6

24

−

−

e

φ

18

Diameter of cylinder head fourth bearing hole

( )

021

.

0

0

7

24

+

H

φ

+0.040～

+0.074

Diameter of camshaft fifth journal

( )

040

.

0

053

.

0

6

24

−

−

e

φ

19

Diameter of cylinder head fifth bearing hole

( )

021

.

0

0

7

24

+

H

φ

+0.040～

+0.074

20

Camshaft thrust groove width

( )

025

.

0

0

7

65

.

30

+

H

+0.15～+0.20

Outside diameter of camshaft oil seal

4

.

0

2

.

0

50

+

+

φ

21

Diameter of cylinder head oil seal hole

( )

025

.

0

0

7

50

+

H

φ

-0.005～

-0.40

Diameter of cylinder head jib hole

( )

024

.

0

006

.

0

7

12

+

+

G

φ

22

Outside diameter of hydraulic jib

φ12-0.011

+0.006～

+0.035

Diameter of crankshaft timing gear segment

Φ28f7

23

Bore diameter of crankshaft timing gear

φ28＋0.030

Key groove dimension of crankshaft timing gear

5

＋

0.030

Key groove width of crankshaft gear

5

＋

0.030

24

Semicircular key width

5

0

-0.030

0~0.06

25

Bore diameter of crankshaft pulley

φ74

+0.046

26

Outside diameter of timing gear

φ74

-0.05

-0.08

0.096~0.126

III. Primary Fit Clearance

Name

Fit Clearance

Axial clearance of crankshaft

0.07～0.265mm

Axial Clearance of Camshaft

0.15～0.20mm

Axial clearance of connecting rod

0.15～0.4mm

Fit clearance of connecting rod bearing

0.023～0.058mm

Fit clearance of main bearing

0.035～0.075mm

Fit clearance between intake valve stem and valve

guide

0.012～0.043mm

guide

Fit clearance between exhaust valve stem and valve

guide

0.032～0.063mm

Fit clearance between hydraulic jib and cylinder

head hole

0.006～0.035mm

IV. Engine Primary Tightening Torque Table

Multiple steps tightening (torque +

angle)

No.

Connection part

Part name

Bolt

(thread specification)

Number

of bolts/

gaskets

(piece)

Tightening

torque

Nm (primary

tightening)

First step

tightening

torque (Nm)

Second step

angle (°)

Third step

angle (°)

1

Cylinder block main oil passage

screw plug 1

Hexagonal socket head

plug

M18×1.5

2

20+5

——

——

——

2

Cylinder block main oil passage

screw plug 2

Hexagonal socket head

plug

M10×1.5

1

20±3

——

——

——

3

Main bearing cap

Hexagon bolt

M11×1.5

4

——

45±5

180±10

——

4

Main bearing cap

Hexagon bolt

M11×1.5X92.5

6

——

45±5

180±10

——

5

Framework-cylinder block

Hexagon bolt

M8×1.25×55

10

20+3

——

——

——

6

Knock sensor-cylinder block

Hexagonal flange bolt

M8×1.25×35

1

20+0.5

——

——

——

7

Connecting rod cap-connecting

rod body

Hexagon bolt

M8×1

8

——

25±3

90±5

——

8

Oil pump assembly-cylinder

block

Hexagon bolt

M6×35

4

8+3

——

——

——

9

Engine oil collector bracket,

separator-framework

Hexagonal flange bolt

M6×12

9

8+3

——

——

——

10

Bleeding plug-oil pan

Hexagon bolt

M16×1.5

1

25±3

——

——

——

11

Oil pan-framework

Hexagonal flange bolt

M7×20

18

15+3

——

——

——

12

Oil pan-framework

Hexagonal flange bolt

M7×35

3

15+3

——

——

——

13

Oil pan-framework

Hexagonal flange bolt

M7×90

4

15+3

——

——

——

14

Water pump-cylinder block

Hexagon bolt

M6×25

5

8+3

——

——

——

15

Cylinder head oil passage

throttle bolt

Hexagon throttle bolt

M14×1.5

2

15+3

——

——

——

16

Camshaft bearing cap-cylinder

head

Locating bolt

M6×1×30

18

9.5±1.5

——

——

——

17

Camshaft bearing cap-cylinder

head

Hexagonal flange bolt

M6×1x30

2

9.5±1.5

——

——

——

Multiple steps tightening (torque +

angle)

No.

Connection part

Part name

Bolt

(thread specification)

Number

of bolts/

gaskets

(piece)

Tightening

torque

Nm (primary

tightening)

First step

tightening

torque (Nm)

Second step

angle (°)

Third step

angle (°)

18

Phaser control valve-first

camshaft cap

Inner hexagonal bolt

M6×1×15

2

8+3

——

——

——

19

Cylinder head-cylinder block

Inner hexagonal bolt

M10×1.5

10

——

50±5

20

Valve cover assembly-cylinder

head

Damping unit-valve

cover

M6×1×30

12

8+3

——

——

——

21

Camshaft position sensor-valve

cover

Inner hexagonal bolt

M6×1×15

2

8+0.5

——

——

——

22

Hanger-cylinder head

Hexagonal flange bolt

M8×14

2

20+5

——

——

——

23

Rear housing of timing

gear-cylinder head

Cross head screw

M5×15

6

5+2

——

——

——

Phaser-camshaft

Inner TORX hollow bolt

M12×1.25

2

120±5

——

——

——

24

Timing gear-camshaft

Bolt

M12×1.25

2

120±5

——

——

——

25

Inlet cam phaser cap-inlet cam

phaser

Hexagon bolt

1

30

——

——

——

26

Exhaust cam phaser cap-exhaust

cam phaser

Inner TORX bolt

1

30

——

——

——

27

Oil filter assembly-oil filter seat

Screw sleeve

M20×1.5

1

25±3

——

——

——

29

Oil filter joint

M20×1.5

1

25±3

——

——

——

30

Oil filter seat-cylinder block

Inner hexagonal bolt

M8×25

3

20+5

——

——

——

31

Oil pressure switch-oil filter

M14×1.25×12

（13×13）

1

12±2

——

——

——

32

Thermostat assembly-cylinder

head

Hexagon bolt

M6×60

3

8+3

——

——

——

33

Thermostat cover-thermostat

case

Hexagonal flange bolt

M6×20

4

8+3

——

——

——

34

Coolant senser-thermostat shell

M12×1.5

1

20+5

——

——

——

35

Crankshaft timing

gear-crankshaft

Hexagonal flange bolt

M13×1.5

1

——

130±10

65±5

——

36

Crankshaft pulley-crankshaft

timing gear

Hexagonal flange bolt

M8×1×15

6

——

25±5

30±5

——

37

Flywheel-crankshaft

Hexagonal flange bolt

M8×1.25

8

——

15±5

30±5

——

38

Signal wheel-flywheel

Hexagon bolt

M8×1.25

6

8±2

——

——

——

39

Timing belt-tensioner

assembly-cylinder block

Hexagonal flange bolt

M8×55

1

27±3

——

——

——

40

Timing belt-idler

assembly-cylinder head

Hexagonal flange bolt

M10×60

1

40+5

——

——

——

41

Bulkhead-crankshaft locating

pin hole

Hexagonal flange bolt

M16×1.5

1

25±3

——

——

——