The clearance between the push rod and valve stem should never be greater than 1/32″ nor less than 1/64″. The correct clearance is naturally half way between these two measurements. The gap should be measured when the push rod is on the heel of the cam.
| What about the care of the Valves? | Answer No. 23 |
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 two valve covers on the right side of engine; (4) raise the valve spring with lifting tool (see Cut No. 4) and pull out the little pin under the valve seat. The valve may then be lifted out by the head.
| How are Valves ground? | Answer No. 25 |
For this work use a good grinding paste of ground glass and oil—procurable from auto supply houses. 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.
Method of grinding valve. (Cut No. 5)