Daewoo POLUS P158LE Operation & Maintenance Manual page 83

•
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.)
Valve Standard
Intake 0.020 ~ 0.049 mm
0.045 ~ 0.074 mm
Exhaust
C) Valve seat
•
Inspect the damage and wear of valve seat and if necessary replace.
•
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 seat thickness>
Standard
0.65 ~ 0.95 mm
<Valve seat angle>
Intake Valve
Exhaust Valve
•
The disassembly of valve seat can be
pulled out by means of a special tool
with the arc welding done at two
points of valve seat rotating tool or
valve seat.
Limit
0.20 mm
0.25 mm
Limit
2.5 mm
˚
30
˚
45
- 79 -
10
0 20
90
30
80
40
70
50
60
Cylinder head
Welding bead
EFM2038I
O
EA0M4048
Valve seat
insert
EA3M2032