Valve Seat Inspection - Honda 954 Service Manual

CYLINDER HEAD/VALVES

VALVE SEAT INSPECTION/

Clean the intake and exhaust valves thoroughly t o
remove carbon deposits.
Apply a light coating o f Prussian Blue t o the valve
seats.
Lap the valves and seats using a rubber hose or other
hand-lapping tool.
Remove and inspect the valves.
The valves cannot
a
valve face is
burned or badly
worn or if it con-
tacts the seat
unevenly, replace
the valve.
Inspect the width o f each valve seat.
STANDARD:
SERVICE LIMIT:
If
the seat is too wide, too narrow or has l o w spots,
the seat must be ground.
VALVE SEAT REFACING
Valve seat cuttersigrinders or equivalent valve seat
Follow the valve
refacing equipment are recommended t o correct
refacing equip-
ment manufactur- w o r n valve seats.
er's operating
instructions.
Use a 45-degree cutter t o remove any roughness or
irregularities f r o m the seat.
with a 4ddegree
cutter whenever a
valve guide is
TOOLS:
replaced
Seat cutter, 29 m m (45" IN)
Seat cutter, 24.5 m m (45" EX)
Cutter holder, 4.5 m m
or equivalent commercially available in U.S.A.
-
-
0.90 1.10 m m (0.035 0.043 in)
1.5 m m (0.06 in)
07780-0010300
07780-0010100
07781-001 0600
ROUGHNESS