VALVE SEAT GRINDING OPERATIONS
WARNING: Always wear eye protection.
CARBON CLEANING-
Use a " Drill for
driving wire carbon cleaning brushes in removing carbon
from the engine block and cylinder heads. The bright,
burnished surface produced will retard carbon accumula-
tion in the completed job. Kerosene will help to remove
very hard carbon. Use proper brushes on aluminum heads
to avoid scoring. After carbon cleaning thoroughly remove
all loose carbon dust.
To sharpen carbon brushes, grind the wire ends square
by holding the brush in an electric drill with the brush
revolving against a running grinding wheel.
Valve guides require very careful cleaning. Carbon
left in the guide will deflect the pilot, resulting in inaccu-
rate work. With " drill, and correct size cleaner, use
the following procedure. 1 . Insert cleaner in guide
before starting drill. 2. For better cleaning, move cleaner
up and down in guide several times - be sure portion of
bristles is kept within the valves guides. 3. Wipe bristles
with clean cloth after clean-
i n g each guide. 4 . The
b r i s t l e s will not be ad-
versely affected by oil or
gasoline.
INSERTING THE PILOT-
After the proper size pilot for the valve
guide has been selected, the tapered sleeve on this pilot
should be run out on its thread as far as possible. Then
insert this pilot until its upper taper stops on the top of
the valve guide. Turn the pilot clockwise with a pilot pin
or pilot wrench to draw the split sleeve against the pilot's
lower taper, thus expanding the split sleeve and locking
the pilot tightly in the guide. Do not overtighten - a firm
fit is desirable. To remove the pilot, turn it once or twice
counterclockwise and pull out.
INSTALLING STONE and SLEEVE on PILOT-
Apply thin film of oil to the pilot - slide the stone sleeve down on the pilot
shank until the storm rests on the valve seat.
Use two stone sleeves to facilitate seat grinding. One sleeve may carry
stone, another a 15
reconditioning valve seat grinding
a
narrowing stone. This procedure eliminates the delay
involved in changing stones on one sleeve for once the pilot is placed in a
valve guide both the finishing and narrowing cuts are usually made to com-
plete that particular valve seat before removing the pilot.
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