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Apply some sealant on the O- ring, put it in the groove of the cylinder head O seal ring. Assemble
the ignition winding clamp plate, fasten the bolt in a symmetric way. Tighten the bolt to 15 Nm
firstly, then tighten the bolt to (20-25) Nm.
2.9.4 Inspection and repair of cylinder head
1.
Inspect the joint between cylinder head and engine block for water, oil and air/gas leakage and
other abnormal phenomenon before removing cylinder head. If any, renew the cylinder head
gasket and check again; the disassembly method of cylinder head gasket can be found in this
Section.
2.
Inspect the surface of cylinder head carefully for color change and crack; if any crack is found,
dye penetrant inspection must be carried out.
3.
Before removing valve train, inspect the valve sinkage by using a depth micrometer, i.e. the
vertical distance between valve bottom surface and cylinder head bottom surface, and the
difference between the measured sinkage and the required sinkage can reflect indirectly the
wear of valve and valve seat. As shown in figure 2-17.
Fig. 2-17 Depth micrometer
See table 4-3 for the required valve sinkage; if the valve sinkage exceeds the permissible
range, it may be necessary to check the wear of the valve and valve seat by installing a new
valve to measure the valve sinkage again; after these operations, if the valve sinkage is still
greater than the required, please replace the cylinder head to ensure the reliability of the diesel
engine. If the valve sinkage does not exceed the permissible value, please remove the valve to
check the sealing surfaces of valve and valve retainer for obvious wear and abnormal damage.
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