Komatsu 4D98 Series - Tightening Torques for Main Bolts

12. Service Standards
12.4 Tightening Torques for Main Bolts and Nuts
Thread
Tightening
Lubricating oil application
Reference
Tightening position
diameter x pitch torque (threaded portion, and
page
(mm)
Nm (kgfom) bearing seat surface)
Cylinder
4TNE94*98 Ml1 xl.25 102.9 - 112.7 Necessary
4-4
head bolt
(10.5 - 11.5)
4TNElO6 (T) M13x 1.5
181.4- 191.2
(18.5 - 19.5)
Connecting
4TNE94.98 MlOx
1.0 53.9 - 58.8
Necessary
4-l 8
rod bolt
(5.5 - 6.0)
4TNE106 (T) Ml1 x
1.0 78.5 - 83.4
(8.0 - 8.5)
Flywheel set
bolt M14x
1.5 186.3 - 205.9
Necessary
4-13
(19-21)
Bearing cap/ 4TNE94*98 1 Ml1 xl.25 / 107.9 - 117.7 /
Necessary
/ 4-19
set bolt
j (ll.O- 12.0) /
I
4TNElO6 (T)
Ml4x 1.5 186.3 - 205.9
(19-21)
Crankshaft pulley set bolt
Fuel valve set bolt
Ml4x 1.5
M6 x 1 .o
107.9 - 127.5
(11 - 13)
6.9 - 8.8
(0.7 - 0.9)
Necessary
Unnecessary
4-12
-
Fuel pump drive gear set nut
Ml4x 1.5 83.4 - 93.2
(8.5 - 9.5)
Unnecessary
4-12
12-7