Seat Grinding

SGF SEAT GRINDER

In preparation for grinding valve seats the following should be observed:

1.Select the correct arbor for the valve guide. The correct arbor should extend approximately 2 3/4" above the valve seat.

2.Pass the stem end of the arbor through an oily shop towel. DO NOT squirt oil into the valve guide.

3.Insert the arbor into the valve guide. Care should taken to insure the valve guide is clean and in good repair.

NOTE: Worn guides will not allow correct reseating of the valve.

4.Select the correct size wheel and angle to grind the valve seat angle. The wheel should be trued prior to attempting to service the seat. Always true the wheel to the manufacturers recommended angle for the valve seat to be serviced. (See dressing the wheel)

Helpful Hint: Place a piece of fine sandpaper between the face of the grinding wheel and the seat (Abrasive facing the valve seat). Turn the stone holder by hand, this will remove any excess carbon and place it into the sandpaper and not into the wheel. This increases the life of the wheel by reducing excess dressing to remove carbon from the face of the wheel.

5.Hold the grinding motor up and support its weight, do not push down with the motor during the grinding operation. Try to maintain as high a RPM as possible while grinding. Run the stone for approximately 45 seconds then stop and evaluate the seat.

EVALUATION: Seat run-out and surface finish is very critical. Seat width should be to manufacturer specification and runout generally MUST be below .002 for seats over 1.50" in diameter and .0015 for seats smaller in diameter than 1.50".

6.Top angle and throat angle should be ground only when necessary to obtain the correct location of valve seat to valve face. It is also used to narrow a seat angle that is too wide.

KW Products Inc.

800-553-5953

500 57th Street, Marion, IA 52302 USA

Equipment specifications, options and accessories subject to change without