1-S18
ZD321, ZD326, ZD331, WSM
ENGINE
3. TIGHTENING TORQUES
Tightening torques of screws, bolts and nuts on the table below are especially specified.
(For general use screws, bolts and nuts : See page G-9.)
[D782-E2-ZD]
W1013236
• 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.
Item Size x Pitch N·m kgf·m lbf·ft
*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
Overflow pipe retaining nut M12 x 1.5 19.6 to 24.5 2.0 to 2.5 14.5 to 18.1
Nozzle holder assembly M20 x 1.5 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 arm bracket nut M6 x 1 9.81 to 11.2 1.00 to 1.15 7.24 to 8.31
*Cylinder head screw 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
*Idle gear shaft mounting screw M6 x 1 9.8 to 11.3 1.00 to 1.15 7.2 to 8.3
Oil pump mounting screw M8 x 1.25 17.7 to 21.6 1.80 to 2.20 13.0 to 15.9
*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
Oil pressure switch PT 1/8 15 to 19 1.5 to 2.0 11 to 14
Nozzle holder – 34.3 to 39.2 3.5 to 4.0 25.3 to 28.9
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 coated gasket M22 x 1.5 44.1 to 53.9 4.5 to 5.5 32.5 to 39.8
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