3.2.3. Valve and valve guide
1) Inspecting the valve
Clean the valves with clean diesel oil,
then inspect them as follows:
(1) Measure the valve stem outer diam-
eter at 3 positions(top, middle, and
bottom). If the amount of wear is
beyond the limit(0.18mm), replace
the valve.
(2) Check the valve seat contacting
faces for scratches or wear, and cor-
rect the faces with grinding paper as
necessary. Replace if severely dam-
aged.
(3) Measure the valve head thickness,
and replace the valve if the mea-
sured value is 1mm or less(a).
Dimensions
Standard Limit
Descriptions
Intake valve
N10.950~10.970 10.87
stem (mm)
Exhaust valve
N10.935~10.955 10.84
stem (mm)
2) Inspection and measurement of valve guide
(1) Install the valve into the valve guide and measure the clearance between them by valve
movement. If the clearance is excessive, measure the valve and replace either the valve or
the valve guide, whichever worn more.
(2) Install the valve into the cylinder head valve guide, then check and see if it is centered with
the valve seat using a special tool.
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