Refacing Valve Seat - Mitsubishi S6S-Y3T61HF Service Manual

1.6 Refacing valve seat

(1) Use the valve seat cutter or valve seat grinder to reface
the valve seat. After refacing, sand the valve seat lightly
using 400 grit sandpaper, inserting it between the cutter
and valve seat.
(2) Lap the valve in the valve seat.
Note: (a) Valve seat refacing should be kept to an absolute
minimum.
(b) If the valve seat width exceeds the limit due to
wear or refacing, replace the valve seat with a
new one.
(c) If the valve sinkage exceeds the limit after
refacing, replace the valve seat with a new one.
INSPECTION AND REPAIR OF BASIC ENGINE
Refacing valve seat
Valve seat cutter
6-5