Valve Seat

CYLINDER HEAD ASSEMBLY:

When valve seat is removed, replace with oversized (0.5 mm, 0.020 inch) valve seat.






Cylinder head recess diameter for service valve seat
Oversize [0.5 mm (0.020 inch)]:
Intake 37.500 - 37.516 mm (1.4764 - 1.4770 inch)
Exhaust 32.700 - 32.716 mm (1.2874 - 1.2880 inch)






CAUTION: When using valve seat cutter, firmly grip the cutter handle with both hands. Then, press on the contacting surface all around the circumference to cut in a single drive. Improper pressure on with the cutter or cutting many different times may result in stage valve seat.

STANDARD
D1 dia.: 34 mm (1.34 inch)
D2 dia.: 35.6 - 35.8 mm (1.402 - 1.409 inch)
D3 dia.: 40.0 - 40.2 mm (1.575 - 1.583 inch)
D4 dia.: 28.7 mm (1.130 inch)
D5 dia.: 30.6 - 30.8 mm (1.205 - 1.213 inch)
D6 dia.: 34.8 - 35.0 mm (1.370 - 1.378 inch)

VALVE SEAT:

Cylinder Head Seat Recess Diameter (D)
INTAKE
Standard...........37.000 - 37.016 (1.4567 - 1.4573)
Service.............37.500 - 37.516 (1.4764 - 1.4770)

EXHAUST
Standard...........32.200 - 32.216 (1.2677 - 1.2683)
Service.............32.700 - 32.716 (1.2874 - 1.2880)


Valve Seat Interference Fit
Intake..............0.081 - 0.113 (0.0032 - 0.0044)
Exhaust............0.064 - 0.096 (0.0025 - 0.0038)

Valve Seat Outer Diameter (d)
INTAKE
Standard...........37.097 - 37.113 (1.4605 - 1.4611)
Service.............37.597 - 37.613 (1.4802 - 1.4808)

EXHAUST
Standard...........32.280 - 32.296 (1.2709 - 1.2715)
Service.............32.780 - 32.796 (1.2905 - 1.2912)