DeWalt DW168F Manual page 46

ValVE sEaT WIDTh
Service
Standard
modeL Limit
(mm)
(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
46