Engine Mechanical: 1D-31
Valve Seat Width
1) Visually check for valve seat width on each valve
face. If the valve face has worn abnormally, replace
the valve.
2) Coat the valve seat with a red lead (Prussian Blue)
and set the valve in place.
3) Rotate the valve with light pressure.
Special tool
(A): 09916–10911 (Valve lapper set)
4) Check that the transferred red lead (blue) on the
valve face is uniform all around and in center of the
valve face.
If the seat width “a” measured exceeds the standard
value, or seat width is not uniform reface the seat
using the seat cutter. Refer to “Valve Seat Repair
(Page1D-33)”.
Valve seat width “a”
Standard: 0.9 – 1.1 mm (0.035 – 0.043 in)
Valve Seat Sealing Condition
1) Clean and assemble the cylinder head and valve
components.
2) Fill the intake and exhaust port with gasoline to
check for leaks. If any leaks occur, inspect the valve
seat and face for burrs or other things that could
prevent the valve from sealing. Refer to “Valve Seat
Repair (Page1D-33)”.
WARNING
!
Always use extreme caution when handling
gasoline.
NOTE
After servicing the valve seats, be sure to
check the valve clearance after the cylinder
head has been reinstalled. Refer to “Valve
Clearance Inspection and Adjustment in
Section 0B (Page0B-4)”.
(A)
I705H1140058-01
“a”
I649G1140246-01
I705H1140059-01
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