Daihatsu F300 Service Manual page 1210

•
•
•
•
(5) Inspect the valve head for its stock thickness.
Minimum Stock Thickness
Intake Valve: 0.8 mm
Exhaust Valve: 1.0 mm
If the stock thickness of the valve head is less than the
minimum stock thickness, replace it with a new one.
11. Inspection and cleaning of valve seats
(1) Using a 45-degrees 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.
CD
Ensure that the valve seat contact surface of the
valve is continuous over the whole circumference.
If not, replace the valve.
®
Ensure that the valve contact surface of the valve
seat is continuous over the whole circumference.
If not, retace the valve seat.
@ Measure the width
of
the contact surface of valve
seat .
Contact Surface of Valve Seat: 1.2 • 1.6 mm
If not, reface the valve seat.
12. Refacing of valve seat
(1) Refacing procedure for intake valve seats
<D
Using a 45-degrees cutter, recondition the rough-
ness on the valve-to-valve seat contact surface, only
enough to obtain a smooth surface.
EM-69
Stock
hick ness
ENGINE MECHANICALS
WFE9Q.EM199
IN
L
ter of valve
~~ctposition
Seat contact width
IN