The valves in the model “A” engine are accurately ground at the factory and should require no further attention for sometime.
When it does become necessary to grind the valves, use a vacuum cup type valve grinder. This is necessary as the faces of the valves are machined smooth.
To grind valves, hold the handle of the grinder between the palms of the hand and rotate it back and forth. (See Fig. 416.)
The grinder holds the valve by suction.
After finding always check the clearance between valves and push rods.
The clearance should not be less than .013 or more than .015”.