Orion AGB-21G - Checking the Valve Seats

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CAMSHAFT /VALVES AND VALVE SPRINGS
NOTE:
3. Eliminate:
carbon deposits
(from the valve face and valve seat)
4. Check:
valve face
Pitting/wear
Grind the valve face.
valve stem end
Mushroom shape or diameter larger than the
body of the valve stem
Replace the valve.
5. Measure:
valve margin thickness
a
Out of specification Replace the valve.
Valve margin thickness
0.65
0.95 mm
6. Measure:
valve stem runout
Out of specification
Replace the valve.
When installing a new valve, always replace
the valve guide.
If the valve is removed or replaced, always re-
place the oil seal.
Valve stem runout
Limit: 0.03 mm
CHECKING THE VALVE SEATS
The following procedure applies to all of the
valves and valve seats.
1. Eliminate:
carbon deposits
(from the valve face and valve seat)
2. Check:
valve seat
Pitting/wear
Replace the cylinder head.
3. Measure:
valve seat width
a
Out of specification Replace the cylinder
head.
Valve seat width
Intake: 0.8
1.2mm
Limit: 1.6 mm
Exhaust: 0.8
1.2mm
Limit: 1.6 mm