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

14.1 Main bolt and nut

No. Name
1 Head bolt
2 Rod bolt
3 Flywheel bolt
4 Metal cap bolt
Crankshaft pulley bolt
5
(FC300 pulley)
6 Nozzle retainer bolt
7 Fuel injection pump gear nut
8 Fuel injection pipe joint nut
9 Heat exchanger set bolt
Starter relay terminal nut
10
(Magnetic relay)

14.2 Standard bolts and nuts (without lube oil)

Name
Hexagon bolt with a "7"
head and hexagon nut.
("7" mark means JIS
strength classification
"7T".)
PT plug (Taper 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
M8 x 1.25
3/4JH4E
M14 x 1.5
4JH4-TE
4JH4-HTE
M12 x 1.5
M8 x 1.25
M6 x 1.0
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
14. Tightening torque for bolts and nuts
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
No lube oil
No 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)
327
Torque
Nm (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)
24.4-28.4 (2.49-2.90)
78-88 (8-9)
59-69 (6-7)
29.4-34.4 (3.00-3.51)
34.2-40.2 (3.49-4.10)
3.0-4.2 (0.31-0.43)
Nm (kgf-m)
Remarks
Apply 80% torque when
tightening to aluminum
alloy.
Apply 60% torque to 4T
bolts and lock nuts.
(4T bolt has no mark on
the head.)