Yanmar 4BY2 - Standard Torque Values

Standard Torque Values
Hexagon Bolts and Nuts
Nominal Diameter Grade (Lubricated)
8.8 or 8 10.9 or 10 12.9 or 12
M4 2.7 N·m (24 in.-lb) 3.88 N·m (34.3 in.-lb) 4.6 N·m (41 in.-lb)
M5 5.5 N·m (48.6 in.-lb) 8 N·m (71 in.-lb) 9.5 N·m (84 in.-lb)
M6 9.5 N·m (84 in.-lb) 13 N·m (115 in.-lb) 16 N·m (142 in.-lb)
M7 15 N·m (133 in.-lb) 22 N·m (195 in.-lb) 26 N·m (230 in.-lb)
M8 23 N·m (204 in.-lb) 32 N·m (24 ft-lb) 39 N·m (29 ft-lb)
M8 x 1 25 N·m (221 in.-lb) 35 N·m (26 ft-lb) 42 N·m (31 ft-lb)
M10 46 N·m (34 ft-lb) 64 N·m (47 ft-lb) 77 N·m (57 ft-lb)
M10 x 1.25 49 N·m (36 ft-lb) 68 N·m (50 ft-lb) 82 N·m (60 ft-lb)
M12 80 N·m (59 ft-lb) 110 N·m (81 ft-lb) 135 N·m (100 ft-lb)
M12 x 1.5 88 N·m (65 ft-lb) 125 N·m (92 ft-lb) 150 N·m (111 ft-lb)
Hose Clamps
Note: Reuse and retightening is prohibited
for all hose clamps. Always install new hose
clamps.
Size Specification
5mm Hex Head 1.0 - 1.5 N·m (8.9 - 13 in.-lb)
6mm Hex Head 2.5 - 3.5 N·m (22 - 31 in.-lb)
PERIODIC MAINTENANCE
BY Series Operation Manual 41
© 2008 Yanmar Marine International