Operation Manual

BX25. RCK54(P)-23BX, RCK60B-23BX, LA240, BT601. WSM
ENGINE
3. TIGHTENING TORQUES
Tightening torques of screws, bolts and nuts on the table below are especially specified.
(Tractor section for general use screws, bolts and
nuts: See page G-8.)
Tractor Section
Item
N'm
kgf·m
ft-Ibs
Front coupling mounting bolt
Engine mounting nut
Cushion mounting nut
23.6 to 27.4
23.6 to 27.4
23.6 to 27.4
2.4 to 2.8
2.4 to 2.8
2.4 to 2.8
17.4 to 20.2
17.4 to 20.2
17.4 to 20.2
W1012736
Engine Section
Item
Size x Pitch
N'm kgf'm
ft-Ibs
*Cylinder head screw
M8 x 1.25
37.3 to 42.2 3.8 to 4.3 27.5 to
31.1
Oil pressure switch
PT
1/8 14.7 to 19.6 1.5 to 2.0
10.8 to 14.5
....
Engine oil filter joint
-
39.2 to 49.0 4.0 to 5.0
29.0 to 36.3
Nozzle holder
-
34.3 to 39.2
3.5 to 4.0
25.3 to 28.9
Overflow pipe retaining nut
M12x1.5 19.6 to 24.5 2.0 to 2.5 14.5t018.1
Nozzle holder assembly M20 x 1.5 49.0 to 68.6 5.0 to 7.0 36.2 to 50.6
*Cylinder head cover screw M6 x 1 6.86 to 11.3 0.7 to 1.15
5.1 to 8.3
Injection pipe retaining nut M12 x 1.5 24.5 to 34.3 2.5 to 3.5
18.1 to 25.3
Glow plug
I
M8 x 1 7.8 to 14.7 0.8t01.5
5.8 to 10.8
*Rocker arm bracket nut M6 x 1 9.8 to 11.3 1.00 to 1.15 7.2 to 8.3
*Fan drive pulley screw
M12x1.5 117.7 to 127.5 12.0 to 13.0 86.8 to 94.0
*Idle gear shaft mounting screw
M6 x 1 9.8 to 11.3
1.00to 1.15 7.2 to 8.3
*Connecting rod screw M7 x 0.75 26.5 to 30.4 2.7 to
3.1
19.5 to 22.4
*Flywheel screw M10 x 1.25 53.9 to 58.8 5.5 to 6.0 39.8 to 43.4
Bearing case cover mounting screw M6 x 1 9.8 to 11.3 1.00 to 1.15 7.2 to 8.3
*Main bearing case screw 2
M7 x 1
26.5 to 30.4 2.7 to
3.1
19.5 to 22.4
*Main bearing case screw 1
M6 x 1 12.7 to 15.7 1.3 to 1.6
9.4 to 11.6
• NOTE
•
In removing and applying the bolts and nuts marked with ".", a pneumatic wrench or similar pneumatic
tool, if employed, must be used with enough care not to get them seized.
•
For· marked screws, bolts and nuts on the table, apply engine oil to their threads and seats before
tightening.
• The letter "M"
in Size x Pitch means that the screw, bolt or nut dimension stands for metric. The size is
the nominal outside diameter in mm of the threads. The pitch is the nominal distance in mm between two
threads.
W1013236
1-S10