Doosan AD158TI, Руководство по эксплуатации и техническому обслуживанию

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Disassembly and assembly of major components - 78 -
b) Check of valve guide
●
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.
●
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.
Note :
Simultaneously be processed when in
guide reamer process.
c) Valve seat
●
Visual inspection
Check if the exterior of the valve spring is damaged with the naked eye. Replace it with a new one
if required.
●
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 wear is excessive, replace the valve seat.
<Valve projecting amount>
<Valve seat angle>
EA0M4052
Valve Standard Limit
Intake 0.020 ~ 0.049 mm 0.10 mm
Exhaust 0.045 ~ 0.074 mm 0.15 mm
B
A
EE1OM068
Valve seat
Valves
Items Standard
Intake (A) 0.65 ~ 0.95 mm
Exhaust (B) 0.65 ~ 0.95 mm
Items Standard
Intake (A) 60°
Exhaust (B) 45°