3-56 ENGINE
VALVE SEAT WIDTH
• Coat the valve seat uniformly with Prussian blue. Install the
valve and attach a valve lapper onto it. Tap the coated seat with
the valve face in a rotating manner, in order to obtain a clear
impression of the seating contact.
" 09916-10911: Valve lapper set
• The ring-like dye impression left on the valve face must be con-
tinuous without any breaks. In addition, the width of the dye
ring, which is the valve seat width, must be within the following
specification.
# Valve seat width W
Standard: 0.9 – 1.1 mm (0.035 – 0.043 in)
If the valve seat is out of specification, re-cut the seat.
VALVE SEAT SERVICING
The valve seats 1 for both the intake and exhaust valves are
machined to two different angles. The seat contact surface is cut
at 45°.
INTAKE EXHAUST
45° N-122 N-122
15° N-121 N-121
" 09916-21111: Valve seat cutter set
09916-20610: Valve seat cutter (N-121)
09916-20620: Valve seat cutter (N-122)
09916-24311: Solid pilot (N-100-5.0)
NOTE:
Use the solid pilot (N-100-5.0) along with the valve seat cutter
(N-121 and -122).
!
The valve seat contact area must be inspected after each
cut.
15°
45°
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