Weichai America Corp.
26
1)
It is allowed that the cylinder head main bolt can be reused for three times;
2)
Align the cylinder heads in turn, and apply a proper amount of clean lubricating oil to
cylinder head main bolt thread, flange bearing surface and flanged nut before installing them
to cylinder head.
3)
Tighten the cylinder head main bolts and cylinder head auxiliary bolt nuts to (30~50)Nm
with torque wrench;
4)
Knock the clamping blocks to ensure they are all seated in place;
5)
Tighten the auxiliary nuts to 100Nm in turn with torque wrench, and make marks on the nuts;
6)
Tighten the main bolts to 200Nm in turn with torque wrench, and make marks on the bolts;
7)
Rotate the auxiliary bolt nuts by 90° in turn with torque wrench, and mark the new positions
of the nuts;
8)
Rotate the main bolts by 90° in turn with torque wrench, and mark the new positions;
9)
Rotate the auxiliary bolt nuts by 90° in turn again with torque wrench to (120~160)Nm;
10)
Rotate the main bolts by 90° in turn again with torque wrench to (240~340) Nm.
Tighten the cylinder head bolts according to the sequence shown in the figure below, The number
1-21 is the secondary bolt, the number 22-45 is the main bolt,
Fig. 2-16 Cylinder Head Bolts Tightening Order
7.
Assemble ignition winding bush
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