Tightening Torques; General Tightening Torque Specifications; Engine Tightening Torques - Yamaha WR250R Service Manual

EAS20320

TIGHTENING TORQUES

EAS20330
GENERAL TIGHTENING TORQUE
SPECIFICATIONS
This chart specifies tightening torques for stan-
dard fasteners with a standard ISO thread pitch.
Tightening torque specifications for special com-
ponents or assemblies are provided for each
chapter of this manual. To avoid warpage, tight-
en multi-fastener assemblies in a crisscross pat-
tern and progressive stages until the specified
tightening torque is reached. Unless otherwise
specified, tightening torque specifications re-
quire clean, dry threads. Components should be
at room temperature.
EAS20340

ENGINE TIGHTENING TORQUES

Item
Camshaft cap bolt
Cylinder head straight screw plug
Cylinder head stud bolt (exhaust
pipe bolt)
Spark plug
Cylinder head bolt
Cylinder head cover bolt
Cylinder head bolt
Oil check bolt
Cylinder head cover bolt (small
head)
Balancer weight screw
Balancer gear nut
Rotor nut
Cam sprocket bolt
Timming chain tensioner bolt
A. Distance between flats
B. Outside thread diameter
A (nut)
10 mm
12 mm
14 mm
17 mm
19 mm
22 mm
Thread
Q'ty
size
M6 8 10 Nm (1.0 m•kg, 7.2 ft•lb)
M12 1 28 Nm (2.8 m•kg, 20 ft•lb)
M8 2 15 Nm (1.5 m•kg, 11 ft•lb)
M10 1 13 Nm (1.3 m•kg, 9.4 ft•lb)
M10 4 40 Nm (4.0 m•kg, 29 ft•lb)
M6 2 12 Nm (1.2 m•kg, 8.7 ft•lb)
M6 2 10 Nm (1.0 m•kg, 7.2 ft•lb)
M8 1 10 Nm (1.0 m•kg, 7.2 ft•lb)
M6 5 10 Nm (1.0 m•kg, 7.2 ft•lb)
M6 3 10 Nm (1.0 m•kg, 7.2 ft•lb)
M14 1 50 Nm (5.0 m•kg, 36 ft•lb)
M12 1 65 Nm (6.5 m•kg, 47 ft•lb)
M7 4 24 Nm (2.4 m•kg, 17 ft•lb)
M6 2 10 Nm (1.0 m•kg, 7.2 ft•lb)
2-15
TIGHTENING TORQUES
General tightening torques
B (bolt)
Nm
6 mm 6
8 mm 15
10 mm 30
12 mm 55
14 mm 85
16 mm 130
Tightening torque
m•kg ft•lb
0.6 4.3
1.5 11
3.0 22
5.5 40
8.5 61
13.0 94
Remarks
LT
LT
LT
lock
washer
use