DV11
Operation and Maintenance
71
Measurement and Inspection of Major Parts
Printed in Mar. 2005 PS-MMA0608-E1A
3) Inspection and measurement of valve and valve guide
a) Valve
z After cleaning the valves with
clean diesel oil, measure the
valve stem's outside diameter
at upper, middle, and lower to
determine the wears and if
there is minor damage, correct
it and when the wears is more
than max allowable limit value,
replace the valves.
<Valve stem outer diameter>
Standard Limit
Intake φ7.963 ∼ φ7.977 mm
φ7.94 mm
Exhaust φ7.950 ∼ φ7.964 mm
φ7.93 mm
z Inspect the scratch and wear
of valve stem seal contacting
face, and if necessary correct
with the grinding paper but if
severe replace it.
z If valve head thickness (H)
becomes less than 1.6mm for
intake and 1.3mm for exhaust,
replace the valve.
<Valve head thickness>
Standard Limit
Intake (A)
3.0 ~ 3.4 mm 2.5 mm
Exhaust (B)
3.3 ~ 3.7 mm 2.8 mm
Valve stem
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