Tightening Torque For Bolts And Nuts; Main Bolt And Nut; Standard Bolts And Nuts (Without Lube Oil) - Yanmar 3YM30 Sevice Manual

14. Tightening torque for bolts and nuts

14. Tightening torque for bolts and nuts

14.1 Main bolt and nut

No Name
1 Head bolt
2 Rod bolt
3 Flywheel retainer bolt
4 Metal cap retainer bolt
Crankshaft pulley bolt
5
(FC250 pulley)
6 Fuel pump gear nut
7 Nozzle fastening nut
Fuel injection pipe
8
joint nut
9 Glow plug
Governor weight
10
support fastening nut

14.2 Standard bolts and nuts (without lube oil)

Name
Hexagon bolt (7T) and
nut
PT plug
Pipe joint bolt
Lube oil application
Thread diameter
(thread portion and seat
x pitch
surface)
M9 x 1.25
M7 x 1.0
M10 x 1.25
M10 x 1.25
M10 x 1.25
M12 x 1.75
M20 x 1.5
M12 x 1.25
M10 x 1.25
M12 x 1.25
Screw dia. x pitch
M6 x 1
M8 x 1.25
M10 x 1.5
M12 x 1.75
1/8
1/4
3/8
1/2
M8
M10
M12
M14
M16
208
Coat with lube oil
Coat with lube oil
Coat with lube oil
Coat with lube oil
Coat with lube oil
Coat with lube oil
No lube oil
No lube oil
No lube oil
Coat with lube oil
Tightening torque
9.8-11.8(1.0-1.2)
22.5-28.5(2.3-2.9)
44-54(4.5-5.5)
78.2-98.2(8.0-10.0)
9.8 (1.0)
19.6 (2.0)
29.4 (3.0)
58.8 (6.0)
12.7-16.7(1.3-1.7)
19.5-25.5 (2.0-2.6)
24.4-34.4 (2.5-3.5)
39.1-49.1 (4.0-5.0)
48.9-58.9 (5.0-6.0)
Torque
N•m(kgf•m)
53.9-57.9 (5.5-5.9)
22.6-27.5 (2.3-2.8)
80.4-86.4 (8.2-8.8)
75.5-81.5 (7.7-8.3)
83.3-93.3 (8.5-9.5)
58.8-68.8 (6.0-7.0)
49-53 (5.0-5.4)
29.4-34.4 (3.0-3.5)
14.7-19.6(1.5-2.0)
68.7-73.7(7.0-7.5)
N•m (kgf•m)
Remarks
Use 80% of the value at
left when the tightening
part is aluminum.
Use 60% of the value at
left for 4T bolts and lock
nuts.
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