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EM–38
11. Inspection and cleaning of valve seats
(1) Using a 45-degree valve seat cutter, reface the valve
seats. Remove only enough metal stock to clean the
seats.
(2) Apply a thin film of red lead (or white lead) to the valve
seat.
(3) Let the valve drop by its own weight onto the valve
seat two or three times.
(4) Take out the valve.
(5) Inspect the valve face and seat for the following items.
q Ensure that the valve seat contact surface of the
valve is continuous over the whole circumference.
If not, replace the valve.
w Ensure that the valve contact surface of the valve
seat is continuous over the whole circumference.
If not, reface the valve seat.
e Measure the width of the contact surface of valve
seat.
Contact Surface of Valve Seat:
If not, reface the valve seat.
12. Refacing of valve seat
(1) Refacing procedure for intake valve seats
q Using a 45-degree cutter, recondition the rough-
ness on the valve-to-valve seat contact surface,
only enough to obtain a smooth surface.
w Using a 30-degree cutter, cut the valve seat in
such way that the circumference of the surface
refaced by the 45-degree cutter may become 29 ±
0.1 mm
1.2 - 1.6 mm
45°
IN
JEM00144-00131
JEM00145-00132
Center of valve
contact position
Seat contact width
JEM00146-00133
45°
IN
JEM00147-00134
29 mm
JEM00148-00135
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