Repair Service Manual
REPAIR MANUAL
1
KUBOTA Z402 and Z602 engines
TIGHTENING TORQUES Z602
Tightening torques for screws, bolts and nuts for particular use
For screws, bolts and nuts marked « * » in the table, smear the threading and seats with motor oil before
tightening.
The letter « M » of dimension x pitch means that the dimension of the screw, bolt or nut relies on the metric
system.
The dimension is the nominal outer diameter of the threadings in mm.
The pitch is the nominal distance in mm between two threads.
Elements
Dimension x
pitch
N-m
Kgf-m
Pounds-feet
* Rocker cover bolts
M6 x 1
6.86 to 11.3
0.7 to 1.15
5.1 to 8.3
Injection duct fastening nut
M12 x 1.5
24.5 to 34.3
2.5 to 3.5
18.1 to 25.3
Overflow duct fastening nut
M12 x 1.5
19.6 to 24.5
2.0 to 2.5
14.5 to 18.1
Injector unit
M20 x 15
49.0 to 68.6
5.0 to 7.0
36.2 to 50.6
Glow plug
M8 x 1
7.8 to 14.7
0.8 to 1.5
5.8 to 10.8
* Rocker ramp nut
M6 x 1
9.8 to 11.3
1.00 to 1.15
7.2 to 8.3
* Cylinder head bolt
M8 x 1.25
37.3 to 42.2
3.8 to 4.3
27.5 to 31.1
* Fan drive pulley screw
M12 x 1.5
117.7 to
127.5
12.0 to 13.0
86.8 to 94.0
* Intermediate gear shaft fastening screws
M6 x 1
9.8 to 11.3
1.00 to 1.15
7.2 to 8.3
Injection pump fastening screws
M8 x 1.25
17.7 to 21.6
1.80 to 2.20
13.0 to 15.9
* Connecting rod head bolt
M7 x 0.75
26.5 to 30.4
2.7 to 3.1
19.5 to 22.4
* Flywheel bolt
M10 x 1.25
53.9 to 58.8
5.5 to 6.0
39.8 to 43.4
Main bearing cap cover fastening bolt
M6 x 1
9.8 to 11.3
1.00 to 1.15
7.2 to 8.3
* Main crankshaft bearing bolt 2
M7 x 1
26.5 to 30.4
2.7 to 3.1
19.5 to 22.4
* Main crankshaft bearing bolt 1
M6 x 1
12.7 to 15.7
1.3 to 1.6
9.4 to 11.6
Oil pressure switch
PT 1/8
14.7 to 19.6
1.5 to 2.0
10.8 to 14.5
Injector nose support
34.3 to 39.2
3.5 to 4.0
25.3 to 28.9
Starter B terminal fastening nut (electromagnetic drive
type)
M8
7.8 to 9.8
0.8 to 1.0
5.8 to 7.2
Starter B terminal fastening nut (planetary gear
reduction type)
M8
5.9 to 11.8
0.6 to 1.2
4.3 to 8.7
Generator pulley nut
M10 x 1.25
39.2 to 44.1
4.0 to 4.5
28.9 to 32.5
Alternator pulley nut
58.3 to 78.9
5.95 to 8.05
43.0 to 58.2
Drain plug with copper gasket
M12 x 1.25
32.4 to 37.3
3.3 to 3.8
23.9 to 27.5
Drain plug with copper gasket
M22 x 1.5
63.7 to 73.5
6.5 to 7.5
47.0 to 54.2
Drain plug with rubber coating gasket
M22 x 1.5
44.1 to 53.9
4.5 to 5.5
32.5 to 39.8