Tightening Torques - Kubota Z400-B Handbuch

[41 TIGHTENING TOROUES
Screws, bolts and nuts must be tightened to the specified torque using a torque wrench. Several screws, bolts and nuts such as
those used on the cylinder head must be tightened in proper sequence and at the proper torque.
1) Tightening torques for special use screws, bolts and nuts
• Note:
• For "0" marked screws, bolts and nuts in the table, apply engine oil to their threads and seats before tightening.
Item Size X Pitch
._
..
_/-.
__
.•
N·m
3.9 to 5.9
o
Head cover cap nuts
." _ . _ - . _ - . ­ - ..--._-...-.­ - . - _ . - t.....-.-._--.
+._-_..
----~
....
o
Head screws and nuts
Bearing case screws 1
_ .. _-_.-j..... ,
39.2 to 44.1
11.8 to _14.,._7_._+._....
12.7 to 15.7
19.6 to 23.5
i--··-··
4.0 to 4.5
1.2 to 1.5
- - - - .
1.3 to 1.6
2.0 to 2.4
o
Bearing case screws 2
2.7 to 3.1
26.5 to 30.,,3..
_--1._ _._:
o
Flywheel screws
..._ _ _ . _. . . _ _ . ._ ..._ . ._ _ _. .__. ._..j .........:...._......
:c::.
o
Connecting rod screws
Rocker arm bracket nuts
O_I<:l!e.JJear~il<lft
screws
Glow
Drain
Nozzle holders
Oil switch screw
-
.....
- . - . - . - .
. ...£.u~lJi.rl'lit~p nut_ _._
Injection
pipe.retai'2il'l\'Lr1U.~
..
-_
..
_
..
_..;.._.
M6
X
1.0
__...._ _ - L _ .
M12 X 1.5
53.9 to 58.8
-···--·4.._·
14.7 to 18.6
o
Crankshaft screw M12 X 1.5 98.1 to 107.9
A: SINo. 61031 & below
5.5 to 6.0
1.5 to 1.9
2.8 to 3.2
1.00 to 1.15
1.00 to 1.15
2.0 to 2.5
3.3 to 3.8
5.0 to 7.0
1.5 to 2.0
0.8 to 1.0
2.5 to 3.5
10.0 to 11.0
ft·lbs
2.9 to 4.3
28.9 to 32.5
8.7 to 10.8
9.4 to 11.6
14.5 to 17.4
19.5 to 22.4
39.8 to 43.4
10.8 to 13.7
20.2 to 23.0
7.23 to 8.32
7.23 to 8.32
14.5 to 18.1
23.9 to 27.5
36.2 to 50.6
10.8 to 14.5
5.8 to 7.2
18.1 to 25.3
72.3 to 79.6
B: SINo. 61032 & above
C: SINo. 124705 & below
D: SINo. 124706 &
above
2) Tightening Torques for general use screws, bolts and nuts
When the tightening torques are not specified, tighten the screws, bolts and nuts according to the table below.
l~'
Standard Screw and Bolt
Special Screw and Bolt SpeCial Screw and Bolt
Grade
Nominal nil
SS41, S20C S43C.S48C SCr435. SCM435
Dlameler
N·m kgf·m It·lbs N'm kgf·m
I
1t·11ls
N·m kgf·m It·lb.
M 6 7.85 to 9.32 0.80100.95
5.79106.87 9.81 10 11.28
1.00 to
1.15_J~:23
to 8.32
12.26 to 14.22 1.25 to 1.45 9.04 1010.49
M 8 17.7 to 20.6 1.8 to 2.1
13.0 to 15.2 23.5 to 27.5 2.4102.8 17.4 to 20.3 29.4 to 34.3 3.0 to 3.5 21. 7 to 25.3
. - - .
Ml0 39.2 to 45.1 4.0 to 4.6 28.9 to 33.3 48.1 to 55.9
4.9105.7
1
35.41041.2
60.8 to 70.6 6.2 to 7.2 :44.8 to 52.1
M12 62.8 to 72.6 6.4 to 7.4 46.31053.5 77.5 to 90.2
7.9109.2 57.1 to 66.5 103.010117.7 10.5to120 759 to 86.8
f - - - - - -..
:.:--­
.
__
.
__
....
t--:::-..
M14 107.9
to
125.5 11.0 to 12.8 79.6 to 92.6 123.6 to 147.1 12.6 to 15.0
91.1 to 108.5 166.710196.1 17.0 to 20.0
1
123 .0.'0144.7
' - ' ' ' ' ­
"'-­
M16 166.7 to 191.2 17.0 to 19.5 123.0 to 141.0 196.1 to 225.6
20.0 to 23.0 144.7 10 166.4 259.9 to 304.0 26.5
to
31.0
i
191.7 to 224.2
M18 245.2 to 284.4 25.0 to 29.0 180.8 to 209.8 274.610318.) 28.0 to 32.5
202.5 to 235.1 343.2 to 402.1 35.0 to 41.0 253.2 10 296.6
M20 333.4 to 392.3 34.0 to 40.0
245.9 to 289.3 367.7 t0431.5 37.5 to 44.0 271.2 to 318.3 490.3 to 568.8 50.01058.0 361.7 to 419.5
Screw and bolt material grades are shown by numbers punched on the screw and bolt heads. Prior to tightening, be sure to check
out the numbers as shown below.
Punched
Screw and Bolt Material Grade
Number
Standard Screw and Bolt
None
SS41,S20C
Special Screw and Bolt
7
S43C, S48C (Tempered)
Special Screw and Bolt
9
SCr435 SCM435 (Tempered)
S-5