Kubota D1803-CR-E4 - 3. Tightening torques

3. Tightening torques
Refer to the following table if the tightening torques of
screws, bolts and nuts are not specified in each part.
3.1 Tightening torques of screws, bolts and nuts for general use
If the tightening torque is not specified, refer to the table below for the none specified torques values.
Indication on top
of bolt
No-grade or 4T 7T
Indication on top
of nut
No-grade or 4T
Unit N⋅m kgf⋅m lbf⋅ft N⋅m kgf⋅m lbf⋅ft
M6 7.8 to 9.3 0.80 to 0.94 5.8 to 6.8 9.80 to 11.3 1.00 to 1.15 7.23 to 8.33
M8 17.7 to 20.6 1.81 to 2.10 13.1 to 15.1 23.5 to 27.5 2.40 to 2.80 17.4 to 20.2
M10 39.2 to 45.1 4.00 to 4.59 29.0 to 33.2 49.0 to 55.9 5.00 to 5.70 36.2 to 41.2
M12 62.8 to 72.6 6.41 to 7.40 46.4 to 53.5 77.5 to 90.2 7.91 to 9.19 57.2 to 66.5
3.2 Tightening torques of screws, bolts and nuts for special use
NOTE
• For the
screws, bolts and nuts with the mark "*", apply engine oil to their threads and seats before you
tighten.
• The alphabet "M" in Dimension × Pitch shows that the screw, bolt or nut dimensions are in the metric
system. The dimension is the nominal external diameter in mm of the threads. The pitch is the nominal
distance in mm between 2 threads.
Disassembling and assembling
Item
Dimension
× Pitch
N⋅m kgf⋅m lbf⋅ft
Drain plug M12 × 1.25 32.4 to 37.2 3.31 to 3.79 23.9 to 27.4
Alternator pulley nut － 58.4 to 78.9 5.95 to 8.05 43.1 to 58.2
*Main bearing case screw 1 M9 × 1.25 46.1 to 51.0 4.70 to 5.20 34.0 to 37.6
*Main bearing case screw 2 M10 × 1.25 68.6 to 73.5 7.00 to 7.49 50.6 to 54.2
*Flywheel screw M12 × 1.25
98.10 to
107.9
10.01 to
11.00
72.36 to
79.58
*Connecting rod screw M8 × 1.0
40.0 to 45.0 4.08 to 4.58 29.5 to 33.1
Oil pump gear 1 mounting nut M12 × 1.25 78.5 to 88.3 8.01 to 9.00 57.9 to 65.1
Camshaft set screw M8 × 1.25 23.5 to 27.5 2.40 to 2.80 17.4 to 20.2
Idle gear mounting screw M8 × 1.25 23.5 to 27.5 2.40 to 2.80 17.4 to 20.2
Fan drive pulley mounting nut M30 × 1.5 167 to 205 17.1 to 20.9 124 to 151
Oil cooler joint screw M18 × 1.5 39.2 to 49.0 4.00 to 4.99 29.0 to 36.1
Supply pump mounting nut / screw M8 × 1.25 23.5 to 27.5 2.40 to 2.80 17.4 to 20.2
(Continued)
4. ENGINE
SERVICING
3. Tightening torques
4-96
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
KiSC issued 12, 2018 A