Tightening Torque; General Torques - Yamaha 20C Service Manual

SPEC
Part to be tightened
POWER UNIT
Crankcase
Cylinder head
Exhaust cover
Spark plug
Flywheel nut
Power unit mounting bolt
UPPER CASE AND GEAR CASE
Upper mount rubber bolt
Bracket mounting bolt
Bracket bolt
Ring nut
Pinon nut
Lower case mounting bolt
Propellor nut

GENERAL TORQUES

This chart specifies tightening torques for stan-
dard fasteners with a standard ISO thread
pitch. Tightening torque specifications for spe-
cial components or assemblies are provided in
applicable sections of this manual.
To avoid warpage, tighten multi-fastener
assemblies in a crisscross fashion and pro-
gressive stages until the specified torque is
reached. Unless otherwise specified, torque
specifications require clean, dry threads.
Components should be at room temperature.
TIGHTENING TORQUE/GENERAL TORQUES

TIGHTENING TORQUE

N·m
1st 15
2nd 28
1st 15
2nd 28
1st
2nd
28
100
21
17
11
45
90
36
38
30
Nut (A) Bolt (B)
8 mm
10 mm
12 mm
14 mm
17 mm
2-8
Tightening torques
kgf·m
1.5
2.8
1.5
2.8
4 0.4
8 0.8
2.8
10
2.1
1.7
1.1
4.5
9.0
3.6
3.8
3.0
General torque
specifications
N·m kgf·m
M5 5 0.5
M6 8 0.8
M8 18 1.8
M10 36 3.6
M12 43 4.3
E
ft·lb
11
20
11
20
2.9
5.8
20
72
15
12
8.0
33
65
25
27
22
ft·lb
3.6
5.8
13
26
31