Suzuki LT-A400, Service Manual

Page: 100 / 502

1D-26 Engine Mechanical:
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 (Page 1D-28)”.
Valve seat width “W” (IN. & EX.)
Standard: 0.9 – 1.1 mm (0.035 – 0.043 in)
Valve Seat Sealing Condition
NOTE
After servicing the valve seats, be sure to
check the valve clearance after the cylinder
head has been reinstalled.
1) Clean and assemble the head and valve
components.
2) Fill the intake and exhaust ports 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.
WARNING
!
Always use extreme caution when handling
gasoline.
Valve Guide Replacement
B827H11406026
1) Remove the cylinder head. Refer to “Engine Top
Side Disassembly (Page 1D-10)”.
2) Remove the valves. Refer to “Cylinder Head
Disassembly and Assembly (Page 1D-22)”.
3) Using the valve guide remover, drive the valve guide
out toward the intake or exhaust camshaft side.
Special tool
: 09916–44310 (Valve guide remover/
installer)
NOTE
• Discard the removed valve guide sub-
assemblies.
• Only oversized valve guides are available
as replacement parts. (Part No. 11115-
14D71)
I827H1140068-01
“W”
I827H1140069-01
I827H1140070-01
I827H1140059-01