DeWalt DW168F - Page 46

46

VALVE SEAT WIDTH
modeL
Standard
(mm)
Service
Limit
(mm)
dW168
0.7~0.9 2.0
dW177
0.7~0.9 2.0
dW188
0.7~0.9 2.0
 6.Make a light pass with a 45° cutter to
remove any possible burrs at the edges of
the seat.
7. After resurfacing the seats, inspect for even
valveseating.ApplyalightcoatofPrussianBlueorerasablefelt-tippedmarkerontothe
valve face. Insert the valve and snap it closed against the seat several times. Ensure
the valve does not rotate on the seat.
  Thetransferredmarkingcompoundshouldshowtheseatingsurfacehasgoodcontact
all the way around.
8. Lap the valves into their seats using a
hand valve lapper and lapping com-
pound(commerciallyavailable).
CAUTION: Risk of property damage.
Ensure all lapping compound is removed
from the engine before reassembly.
NOTE: Adjust the valve clearance after
reassembly.
VALVE
LAPPER