Yanmar 2YM15 - 14 Tightening Torque for Bolts and Nuts; Main Bolt and Nut; Standard Bolts and Nuts (Without Lube Oil)

14. Tightening torque for bolts and nuts
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14. Tightening torque for bolts and nuts
14.1 Main bolt and nut
14.2 Standard bolts and nuts (without lube oil)
No Name
Thread diameter
x pitch
Lube oil application
(thread portion and seat
surface)
Tor qu e
N•m(kgf•m)
1 Head bolt M9 x 1.25 Coat with lube oil 53.9-57.9 (5.5-5.9)
2 Rod bolt M7 x 1.0 Coat with lube oil 22.6-27.5 (2.3-2.8)
3 Flywheel retainer bolt M10 x 1.25 Coat with lube oil 80.4-86.4 (8.2-8.8)
4 Metal cap retainer bolt M10 x 1.25 Coat with lube oil 75.5-81.5 (7.7-8.3)
5
Crankshaft pulley bolt
(FC250 pulley)
M10 x 1.25 Coat with lube oil 83.3-93.3 (8.5-9.5)
6 Fuel pump gear nut M12 x 1.75 Coat with lube oil 58.8-68.8 (6.0-7.0)
7 Nozzle fastening nut M20 x 1.5 No lube oil 49-53 (5.0-5.4)
8
Fuel injection pipe
joint nut
M12 x 1.25 No lube oil 29.4-34.4 (3.0-3.5)
9 Glow plug M10 x 1.25 No lube oil 14.7-19.6(1.5-2.0)
10
Governor weight
support fastening nut
M12 x 1.25 Coat with lube oil 68.7-73.7(7.0-7.5)
N•m (kgf•m)
Name Screw dia. x pitch Tightening torque Remarks
Hexagon bolt (7T) and
nut
M6 x 1 9.8-11.8(1.0-1.2) 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.
M8 x 1.25 22.5-28.5(2.3-2.9)
M10 x 1.5 44-54(4.5-5.5)
M12 x 1.75 78.2-98.2(8.0-10.0)
PT plug 1/8 9.8 (1.0) -
1/4 19.6 (2.0)
3/8 29.4 (3.0)
1/2 58.8 (6.0)
Pipe joint bolt M8 12.7-16.7(1.3-1.7) -
M10 19.5-25.5 (2.0-2.6)
M12 24.4-34.4 (2.5-3.5)
M14 39.1-49.1 (4.0-5.0)
M16 48.9-58.9 (5.0-6.0)