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19) Inspection of Valve Seat
1.
Remove the carbon built up on the valve.
2.
Evenly apply a thin coat of red lead to the valve seat.
3.
Use a valve lapper (commercially available) to push the
valve onto the valve seat lightly as shown in the diagram.
Measure the valve seat contact width a of the valve face
4.
stained with red lead. Correct the valve seat if the contact
area is above or below the center or the contact area of
the valve seat is greater than the specified limit.
Valve Seat Contact Width a: Standard Value
Intake/Exhaust Side: 1.0 mm (0.04 in)
Functional Limit:
Intake/Exhaust Side: 2.0 mm (0.08 in)
4st 25/30 2022
a
5
5-53
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