Maintenance Manual of 4M11 Series Diesel Engine For Land Power Generators
40
3) Assemble the cylinder head onto the cylinder block.
4) Loose cylinder head bolt;
5) Tighten the cylinder head bolts to 30N.m, rotate the bolts for 120°±4°, and then rotate
further for 120°±4°.
6) The tightening sequence for the cylinder head bolts of each cylinder is shown in figure
below. The tightening sequence for the cylinders is 2nd, 3rd, 4th, and 1st cylinders.
Notice: Each bolt is stretched by (0.2~0.6) mm during every tightening process. The
maximum allowable length is 160.5mm for the bolts after repeated use. Any bolt in excess of
this length must be replaced with new one.
Figure 4-6 Tightening Sequence of Bolts
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