California Air Tools 3010 Service Manual Page 100

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4-10 ENGINE TOP END
Valves
Valve Clearance Adjustment
Loosen the valve adjusting screw locknut [A].
Turn the valve adjusting screw [B] until the correct clear-
ance is obtained.
Holding the adjusting screw with the holder [C], tighten
the locknut.
Special Tool - Valve Adjusting Screw Holder: 57001-1217
Torque - Valve Adjusting Screw Locknut: 9.8 N·m (1.0
kgf·m, 87 in·lb)
Valve Seat Inspection
Remove the valve.
Check the valve seating surface [A] between the valve [B]
and valve seat [C].
Coat the valve seat with machinist’s dye.
Push the valve into the guide.
Rotate the valve against the seat with a lapping tool.
Pull the valve out, and check the seating pattern on the
valve head. It must be the correct width [A] and even all
the way around.
NOTE
The valve stem and guide must be in good condition, or
this check will not be valid.
If the valve seating pattern is not correct, repair the seat.
Measure the outside diameter [D] of the seating pattern
on the valve seat.
If the outside diameter of the valve seating pattern is too
large or too small, repair the seat.
Valve Seating Surface Outside Diamete r
Inlet: 29.5 mm (1.16 in.)
Exhaust: 25.5 mm (1.00 in.)
Measure the seat width [E] of the portion where there is
no build-up carbon (white portion) of the valve seat with a
vernier caliper.
Good [F]
Too W ide [G]
Too Narrow [H]
Uneven [J]
If the width is too wide, too narrow or uneven, repair the
seat (See Valve Seat Repair).
Valve Seating Surface Width
Standard: 0.5 1.1 mm (0.02 0.04 in.)
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