Part IV Wiring Diagram
30
guide pipe: Subtract outer diameter of valve stem
from corresponding inner diameter of valve guide
pipe to obtain the clearance between valve guide pipe
and valve stem.
f) If the clearance between valve stem and valve
guide exceeds maintenance limit, replace a new
guide, to judge if the clearance can be within
maintenance limit. If so, replace valve guide and stick
valve guide.
Re-trim valve seat when replacing the valve guide
pipe.
④
Valve seat:
a) Thoroughly remove carbon deposit out of
combustion chamber and valve seat, and apply a thin
layer of red lead powder on the surface of valve, or
other adhesive color paints easy to be wiped.
b) Insert the valve and press the valve with effort a
few times, but do not rotate the valveon the valve
seat. If the valve seat is stained with paint,it indicates
that it is in close contact with the valve; otherwise, it
fails to contact.
This indicates that the valve and the valve seat are not
concentric.
c) Grind the valve seat by 45° grinder to create a
smooth valve seat being concentric with the valve
guide, and rotate it clockwise (do not rotate it
counterclockwise).
Tool:
Valve grinder
d) Use 32° and 45° grinders to reduce and adjust the
valve seat, to make it be in contact with middle part
of valve cone face.
Grind top edge of valve seat by 32° grinder
(contacting too high).
Grind bottom edge of the valve by 45° grinder
(contacting too low).
Valve seat
grinding
handle
Intake valve: 32°
Exhaust valve: 32°
Intake valve: 45°
Exhaust valve: 45°
Valve
surface
