DV11
Operation and Maintenance
73
Measurement and Inspection of Major Parts
Printed in Mar. 2005 PS-MMA0608-E1A
< Valve seat thickness >
Standard
Limit
Intake (A) 0.38
∼
0.42 mm
0.7 mm
Exhaust (A) 0.38
∼
0.42 mm
0.8 mm
< Valve seat angle >
Intake (B)
Exhaust (B)
60
O
45
O
z
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.
z
Regarding the valve seat
assembling, shrink the valve
seat by putting it in the dry ices
for about 1 hour or so, and then
press it into the cylinder head
by means of a special tool.
z
It is necessary to work boring
of inner diameter of it when
replace the valve seat.
z
After coating the grinding
powder paste on valve head
contacting face of valve seat,
and after executing a sufficient
lapping operation with the
rotating and grinding motion of
valve, wipe off the grinding
agent thoroughly.
Valve seat
Valve
Valve seat
Cylinder head
Welding bead
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