SERVICE STANDARDS
Tightening Torque for Bolts and Nuts
12/05
6LY3 Service Manual
14-11
© 2007 Yanmar Marine International
Standard Bolts and Nuts (Without Oil)
Name
Bolt Diameter x Pitch
Tightening Torque
Remarks
Hexagon Bolt (7T)
and Nut
M6 x 1
9.8-11.8 N·m (1.0-1.2 kgf·m) (7.0-9.0 lb-ft)
Use 80% of the value at left
when tightening aluminum
parts.
Use 60% of the value at left
for 4T bolts and locknuts.
M8 x 1.25
22.5-28.5 N·m (2.3-2.9 kgf·m) (17-21 lb-ft)
M10 x 1.5
44-54 N·m (4.5-5.5 kgf·m) (32-40 lb-ft)
M12 x 1.75
78.2-98.2 N·m (8.0-10.0 kgf·m) (58-72 lb-ft)
PT Plug
1/8
9.8 N·m (1.0 kgf·m) (7.0 lb-ft)
—
1/4
19.6 N·m (2.0 kgf·m) (14 lb-ft)
3/8
29.4 N·m (3.0 kgf·m) (22 lb-ft)
1/2
58.8 N·m (6.0 kgf·m) (43 lb-ft)
Pipe Joint Bolt
M8
12.7-16.7 N·m (1.3-1.7 kgf·m) (9.0-12 lb-ft)
—
M10
19.5-25.5 N·m (2.0-2.6 kgf·m) (14-19 lb-ft)
M12
24.4-34.4 N·m (2.5-3.5 kgf·m) (18-25 lb-ft)
M14
39.1-49.1 N·m (4.0-5.0 kgf·m) (29-36 lb-ft)
M16
48.9-58.9 N·m (5.0-6.0 kgf·m) (36-43 lb-ft)
