Engine JAC HFC4DA1-2C. Manual — part 3

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

11

No.

Description

N．m

58

Tightening socket nut

30

59

Bolt and nut of starter motor

81

60

Fixing nut of starter cable

9

61

Exhaust branch pipe bolt

30

62 Bolt

of

heat

shield

25

63 Support

bolt

40

64 Front

exhaust

pipe

nut

40

65

Crankshaft belt pulley bolt

210

66 Exhaust

pipe

nut

67

67

Torque of engine bracket bolt

M10：40

M12：69

68

Cylinder head cover nut

13

69

Connecting nut between turbocharger and exhaust

manifold

25

70

Connecting bolt between exhaust manifold and

cylinder head

30

71

Bolt of exhaust pipe heat shield

25

72

Connecting bolt of turbocharger air bleeding pipe

25

73

Perforated bolt of lubricating oil pipe

M12：41

M14：55

Comparison Table for Standard Bolt Specification and Tightening Torque

☆

Bolt Identification

Torque (N.m)

Specification

Less than grade 8.8

(low carbon steel)

Grade 8.8 (High

carbon steel)

Grade 10.9 (Alloy

steel)

M6×1.0 4~8

5~10

. ...

M8×1.25 8~18

12~23

17~31

M10×1.25 21~35

28~47

38~64

M10×1.5 20~34

28~46

37~61

M12×1.25 50~75

62~93

77~116

M12×1.75 46~70

58~86

73~109

M14×1.5 78~117

95~142

116~174

M12×2.0 73~109

90~134

109~163

M16×1.5 106~160

138~208

163~245

M16×2.0 102~152

132~198

156~234

M18×1.5 154~230

199~299

234~352

M20×1.5 210~316

275~413

323~485

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

12

M22×1.5 256~422

370~555

433~649

M24×2.0 360~550

439~725

565~847

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

13

Section VI Main Fitting Clearances and Allowable Wear Limits of Engine

No. Name Standard

Size

(mm)

Fitting

nature

Assembly

Clearance for

New Engine

(mm)

Wear Limit

(mm)

1

Contact width between
valve and seat ring

Intake valve

1.7

2.2

Exhaust valve

2

2.5

2

Valve sinkage

Intake valve

0.73

1.28

Exhaust valve

0.71

1.2

3 Backlash

0.05-0.13

0.3

4

Axial run-out clearance of
idler gear A

0.07

0.2

5

Outside diameter of tappet

010

.

0

028

.

0

13

−

−

Φ

Clearance

0.01～0.046

0.10

Tappet bore

018

.

0

0

13

+

Φ

6

Radial run-out of push rod

0.3

7 Deflection

of

rockshaft

0.3

8

Outside diameter of
rockshaft

0

02

.

0

19

−

Φ

Clearance

0.01～0.05

0.20

Rocker arm bore

03

.

0

01

.

0

19

+

+

Φ

9

Rod diameter of intake
valve

039

.

0

054

.

0

8

−

−

Φ

Clearance

0.039～0.071

0.20

Valve guide bore

017

.

0

0

8

+

Φ

10

Rod diameter of exhaust
valve

064

.

0

079

.

0

8

−

−

Φ

Clearance

0.064～0.096

0.25

Valve guide bore

017

.

0

0

8

+

Φ

11

Free height of valve spring

48

Perpendicularity of valve
spring

Φ1.4

12

Outside diameter of idler
gear A shaft

025

.

0

055

.

0

55

−

−

Φ

Clearance

0.025～0.080

0.2

Inside diameter of idler gear
A bearing

03

.

0

0

55

+

Φ

13

Cylinder sleeve bore

065

.

0

020

.

0

93

+

+

Φ

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

14

No. Name Standard

Size

(mm)

Fitting

nature

Assembly

Clearance for

New Engine

(mm)

Wear Limit

(mm)

Name Standard

Size

(mm)

Fitting

nature

Assembly

Clearance for

New Engine

(mm)

Wear Limit

(mm)

13

Protrusion height of
cylinder sleeve

0～０.08

14

Axial run-out clearance of
camshaft

Clearance

0.05～0.13

0.20

Cam height of camshaft

42.02±0.05 0.38

15

Inside diameter of camshaft
bush

025

.

0

0

50

+

Φ

Clearance

0.025～0.080

0.12

Diameter of camshaft
journal

025

.

0

055

.

0

50

−

−

Φ

16

Deflection of cam bush

0.02

0.1

17

Outside diameter of piston
pin

0

005

.

0

34

−

Φ

Clearance

0.002～0.015

0.03

Piston pin bore

010

.

0

002

.

0

34

+

+

Φ

18

Thickness of connecting
rod large end

0

07

.

0

33

−

Φ

Clearance

0.175～0.320

0.35

Opening of crankshaft
connecting rod journal

250

.

0

175

.

0

33

+

+

Φ

19

Clearance of intake and
exhaust valves (cold state)

Clearance

0.3～0.4

20

Main journal

068

.

0

086

.

0

70

−

−

Φ

Clearance

0.031～0.066

0.11

Main bush bore (after
assembly)

003

.

0

033

.

0

70

−

−

Φ

21

Outside diameter of piston
pin

0

036

.

0

34

−

Φ

Clearance

0.008～0.026

0.05

Inside diameter of
connecting rod bush

020

.

0

038

.

0

34

+

+

Φ

22

Crankshaft connecting rod
journal

070

.

0

085

.

0

53

−

−

Φ

Clearance

0.029～0.069

0.1

Connecting rod bush bore
(after assembly)

016

.

0

041

.

0

53

−

−

Φ

23

Grouping of piston outside
diameter

Grouping

clearance

0.053～0.075

Group A

92.957～92.968

Group B

92.968～92.979

Group C

92.979～92.990

Group D

92.990～93.001