Tightening Torque For Bolts And Nuts; Main Bolt And Nut; Standard Bolts And Nuts (Without Lube Oil) - Yanmar 3JH4E Service 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
(FC300 pulley)
6 Fuel pump gear nut
7 Nozzle fastening bolt
Fuel injection pipe
8
joint nut
Starter relay terminal
9
nut

14.2 Standard Bolts and Nuts (without lube oil)

Name
Hexagon bolt t (7T)
and nut
PT plug
Pipe joint bolt
Thread diameter
x pitch (mm)
M10 x 1.25
M9 x 1.0
M10 x 1.25
M12 x 1.5
M14 x 1.5
M14 x 1.5
M8 x 1.25
M12 x 1.5
M6 x 1
Screw dia. x pitch (mm)
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
Lubricating oil application
(thread portion, and seat
surface)
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
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)
197
Torque
N•m(kgf-m)
85.2-91.2 (8.69-9.30 )
44.1-49.1 (4.50-5.01)
83.3-88.3 (8.49-9.00)
96-100 (9.79-10.2)
83.2-93.2 (8.48-9.50)
78-88 (8-9)
24.4-28.4 (2.49-2.90)
29.4-34.4 (3.00-3.51)
3.0-4.2 (0.31-0.43)
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.