Doosan P158LE -III, Руководство по эксплуатации и техническому обслуживанию

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Inspection - 65 -
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 1.6 mm for
intake and 1.3 mm for exhaust,
replace the valve.
b) Valve guide
z
Insert the valve into valve guide
and measure the clearance
between valve and valve guide by
the shaking degree of valve. If the
clearance is bigger, measure the
valve and then replace the more
worn valve guide.
z
If the valve guide has already
been replaced, measure the
center with valve seat if it deviates
or not and if abnormal it must be
corrected. (Simultaneously be
processed when in guide reamer
process.)
c) Valve seat
z Inspect the damage and wear of valve seat and if necessary replace.
z
Valve seat thickness and angle.
Assemble the valves at the cylinder head and using the measuring instrument from the lower
face, measure the projection amount of valve. If the measured value is more than the use
limit, replace the valve seat.
Valve Standard Limit
Intake 2.6 ~ 3.0 mm 1.6 mm
Exhaust 1.9 ~ 2.3 mm 1.3 mm
Valve Standard Limit
Intake 0.020 ~ 0.049 mm 0.20 mm
Exhaust 0.045 ~ 0.074 mm 0.25 mm
EFM2037I
H
Measuring
position
EA0M4052