Yanmar 4JH4E - 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 (mm)
Lubricating oil application
(thread portion, and seat
surface)
Tor qu e
Nm (kgf-m)
1 Head bolt M10 x 1.25 Coat with lube oil 85.2-91.2 (8.69-9.30)
2 Rod bolt M9 x 1.0 Coat with lube oil 44.1-49.1 (4.50-5.01)
3 Flywheel bolt M10 x 1.25 Coat with lube oil 83.3-88.3 (8.49-9.00)
4 Metal cap bolt M12 x 1.5 Coat with lube oil 96-100 (9.79-10.2)
5
Crankshaft pulley bolt
(FC300 pulley)
M14 x 1.5 Coat with lube oil 83.2-93.2 (8.48-9.50)
6 Nozzle retainer bolt M8 x 1.25 No lube oil 24.4-28.4 (2.49-2.90)
7 Fuel injection pump gear nut
3/4JH4E
M14 x 1.5
No lube oil 78-88 (8-9)
4JH4-TE
4JH4-HTE
Coat with lube oil 59-69 (6-7)
8 Fuel injection pipe joint nut M12 x 1.5 No lube oil 29.4-34.4 (3.00-3.51)
9 Heat exchanger set bolt M8 x 1.25 No lube oil 34.2-40.2 (3.49-4.10)
10
Starter relay terminal nut
(Magnetic relay)
M6 x 1.0 No lube oil 3.0-4.2 (0.31-0.43)
Nm (kgf-m)
Name Screw dia. x pitch (mm) Tightening torque Remarks
Hexagon bolt with a "7"
head and hexagon nut.
("7" mark means JIS
strength classification
"7T".)
M6 x 1 9.8-11.8 (1.0-1.2) 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.)
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 (Taper 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)