10. Cylinder block/head
174
Valve
General Information
The overhead valves are actuated via chilled cast iron
tapets, push rods and rocker arms from the camshaft.
Check of Valve
After cleaning the valves with clean diesel oil, measure
the valve as follow.
1. Measure the valve stem’s outside diameter at upper,
middle, and lower to determine the wears and wh
en
t
he wear limit is more than limit, replace the valves.
DV2213117A_E
2. inspect the scratch and wear of valve stem seal
contacting face, and if necessary correct with the
grinding paper but if severe replace it.
3. if valve head thickness becomes less than limit,
replace the valve.
DV2213118A
Check of Valve Guide
1. Inser the valve into valve guide and measure the
clearance between valve and valve guide by t
he
shak
ing degree of valve. If the clearance is bigger,
measure the valve and then replace the more worn
valve guide.
DV2213119A_E
2. If the valve guide has already been replaced, measure
t
he center with valve seat if it deviates or not and if
abnormal it must be corrected.
Note) Simultaneously be processed when in guide reamer
process.
Item Standard Limit
In.
Ø11.969 ~ Ø11.980mm Ø11.830mm
Ex.
Ø11.945 ~ Ø11.955mm Ø11.805mm
Item Standard Limit
In. 2.6 ~ 3.0mm 1.6mm
Ex. 1.9 ~ 2.3mm 1.3mm
If the damage is severe, replace new one.
Valve stem
Item Standard Limit
In. 0.020 ~ 0.049mm 0.20mm
Ex. 0.045 ~ 0.074mm 0.25mm
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