Ford Manual
They seldom get out of order---but they do get dirty, as a result of carbon collecting on the valve seats.
These carbon deposits, by preventing proper closing of the valves, permit the gases under compression to
escape, resulting in loss of power and uneven running of the motor. If, when turning the engine over
slowly, there is a lack of resistance in one or more cylinders, it is probable that the valves need re-
grinding. As the "life" of the engine depends largely upon the proper seating of the valves, it is necessary
that they be ground occasionally.
How are Valves removed for
grinding?
Answer No.
24
(1) Drain radiator; (2) remove cylinder head; (3)
remove the valve cover on the right side of engine;
(4) raise the valve spring with lifting tool (see Cut
No.3) and pull out the valve seat pin that is in the
valve stem. The valve may then be lifted out by the
head.
How are Valves ground?
Answer. No.
25
For this work use a good valve grinding compound.
A convenient way is to put a small amount in a
suitable dish, adding a spoonful or two of kerosene
and a few drops of lubricating oil to make a thin
paste.
Place the mixture sparingly on the bevel face of the
valve. Put the valve in position on the valve seat,
and rotate it back and forth (about a quarter turn) a
few times, with a Ford grinding tool. Then lift
slightly from the seat, change the position and
continue the rotation, and keep on repeating this
operation until the bearing surface is smooth and
bright. The valve should not be turned through a
complete revolution, as this is apt to cause scratches
running around the entire circumference of the
valve and seat.
The valve should not be turned through a complete revolution, as this is apt to cause scratches running
around the entire circumference of the valve and seat.
When the grinding is completed the valve should be removed from the cylinder, thoroughly washed with
kerosene, and the valve seat wiped out thoroughly. Extreme care should be taken that no abrasive
substance gets into the cylinders or valve guides. This can be avoided if the grinding paste is applied
sparingly to the bevel face of the valve.
If the valve seat is badly worn or pitted, it is best to have it reseated with a valve seating tool. This
operation requires considerable skill, and perhaps had better be done by an expert mechanic. Care should
be exercised against making too deep a cut, necessitating the retiming of the valve.
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