Tightening fasteners

When tightening the bolts or nuts that attach a component, it is always good practice to tighten the bolts gradually and evenly to avoid misalignment or over stressing any one portion of the component. For components sealed with gaskets, this method helps to ensure that the gasket will seal properly and completely.

Where there are several fasteners, tighten them in a sequence alternating between opposite sides of the component. Repeat the sequence in stages until all the bolts are evenly tightened to the proper specification.

For some repairs a specific tightening sequence is necessary, or a particular order of assembly is required. Such special conditions are noted in the text, and the necessary sequence is described or illustrated. Where no specific torque is listed, Table a can be used as a general guide for tightening fasteners.

Table a is a general reference only. The values listed in the table are not intended to be used as a substitute for torques specifically called out in the text throughout this manual.

' Metric bolt classes or grades are marked on the bolt head.

• Do not confuse wrench size with bolt diameter size. For a listing of the common wrenches used on various bolt diameters, see Basic tool requirements.

Table a. General Bolt Tightening Torques in Nm (max. permissible)

Bolt diameter

5.8

10.9

12.9

M5

2.5

3.5

4.5

6

8

10

M6

4.5

6

7.5

10

14

17

M8

11

15

18

24

34

40

M10

23

30

36

47

66

79 140

M12

39

52

62

82

115

M14

62

82

98

130

180

220

M16

94

126

150

200

280

340

M18

130

174

210

280

390

470

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