VALVE SEATS
1. Eliminate:
- Carbon sediments.
(from the valve face and seat).
2. Inspect:
- Valve seats.
Grooves/wear => Grind the valve.
Steps for removal:
- Apply blue mechanical dye (Dykem) (b) to the valve face.
- Fit the valve into the cylinder head.
- Press the valve against the guide and against the seat to
make a visible mark.
- Measure the width of the valve seat.
Where there was contact between the seat and the valve
face, the dye will be removed.
- If the valve seat width is large or small, or if the seat is not
centred, it has to be redone
3. Grind:
- Valve face.
- Valve seat.
N.B.:
AFTER RECTIFYING THE VALVE SEAT OR REPLACING THE
VALVE AND ITS GUIDE, THE SEAT AND FACE MUST BE
GROUND.
50
INSPECTION AND REPAIR
WORKSHOP MANUAL
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