14. Tightening torque for bolts and nuts20814. Tightening torque for bolts and nuts14.1 Main bolt and nut14.2 Standard bolts and nuts (without lube oil)No Name Thread diameterx pitchLube oil application(thread portion and seatsurface)TorqueN•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 pipejoint 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 weightsupport 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 RemarksHexagon bolt (7T) andnutM6 x 1 9.8-11.8(1.0-1.2) Use 80% of the value atleft when the tighteningpart is aluminum.Use 60% of the value atleft for 4T bolts and locknuts.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)
