Weichai America Corp.
28
Table 2-3 Required valve sinkage
Required valve sinkage (mm)
Intake valve
-0.2~0.2
Exhaust valve
-0.22~0.22
4.
Check the inside of cylinder head intake and exhaust passages for water leakage after
removing valve train; if any, please clean the intake and exhaust passages and perform dye
penetrant inspection to confirm the faulty location, and renew the cylinder head when
necessary.
5.
Clean cylinder head, particularly the combustion chamber surface, valve seat, intake/exhaust
valve, intake/exhaust passage, so as to remove the soot deposition and adhesive from the
surface, and check the surface condition.
6.
Check valve guide inside diameter, if it exceeds the permissible value due to wear, the guiding
function of the valve could be affected and thus reducing the operational reliability of diesel
engine. The valve guide inside diameter can be measured with inside micrometer, as shown in
figure 4-18. Permissible inside diameter is
（
9.0~9.015
）
mm; if this range is exceeded,
please replace the cylinder head to ensure the operational reliability of the diesel engine.
Fig. 2-18 Inside micrometer
7.
Remove cylinder head gasket and check it for visible damages; if any, find the causes. What
should be pointed out is that no matter whether the cylinder head gasket is failure or not,
please replace with new one as long as it was removed.
8.
Before removal, check the rubber lip of valve stem sealing sleeve for damage, spring for
failure and other abnormalities, but it should be noted that once the valve stem sealing sleeve
is removed, a new one should be replaced.
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