10-33
HRN216 CAMSHAFT/CRANKSHAFT/ PISTON/CYLINDER
The 31° cutter removes material from the top edge (contact too
high).
The 60° cutter removes material from the bottom edge (contact too
low).
Be sure that the width of the finished valve seat is within
specification.
Make a light pass with the 45° cutter to remove any possible burrs
at the edge of the seat.
After resurfacing the seats, inspect for even valve seating.
Apply Prussian Blue compound or erasable felt-tipped marker ink
to the valve seat. Insert the valve, and snap it closed against its
seat several times. Be sure the valve does not rotate on the seat.
The seating surface, as shown by the transferred marking
compound, should have good contact all the way around.
Thoroughly clean the cylinder head to remove any cutting residual.
Lap the valves into their seats, using a commercially available
valve lapper and lapping compound.
After lapping, wash all residual compound off the cylinder head
and valve.
• Do not push the valve against the seat with force during lapping.
Apply a light pass with the valve lapper.
• Avoid lapping the valve in the same position as it causes
uneven wear. Lap the valve by turning the lapper slowly.
• Take care not to allow the lapping compound to enter the gap
between the stem and guide.
Adjust the valve clearance after assembly (P. 3-15
).
TOOLS:
Cutter holder 5.50 mm NWY TW 505
(Commercially available)
Flat cutter, 30 mm (31° IN/EX) NWY CU 115
(Commercially available)
TOOLS:
Cutter holder 5.50 mm NWY TW 505
(Commercially available)
Interior cutter, 30 mm (60° IN/EX) NWY CU 122
(Commercially available)
STANDARD: 0.7 – 0.9 mm (0.03 – 0.04 in)
SERVICE LIMIT: 1.8 mm (0.07 in)
TOOLS:
Cutter holder 5.50 mm NWY TW 505
(Commercially available)
Seat cutter, 27.5 mm (45° IN/EX) NWY CU 111
(Commercially available)
VALVE FACE
31°
VALVE FACE
60°
CONTACT TO STANDARD
VALVE FACE
CONTACT TOO HIGH
VALVE FACE
CONTACT TOO LOW
VALVE FACE
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