4. Select grinding wheel of proper size and type.
FOR STEEL use a "K" roughing wheel for fast cutting and a "K"
finishing wheel for finishing.
FOR CAST IRON MOTOR BLOCK SEATS use the "K" finishing
wheel only, a roughing wheel is not needed.
5. Screw wheel on holder.
In case of large wheels with 1" smooth center holes these may be
used with regular No. 1703-BB Holder by using No. 1703-7 Flange.
No. 3 hole grinding wheels may be used with No. 1702-BB Holder
by using our No. 47 Reducing Bushing. (Fig. 2 and 3.)
6. Be sure top of pilot has a drop of oil on it to eliminate friction.
Place holder over pilot. On large valves above 2 1/2" in diameter,
the use of lifting springs is recommended. (Fig. 4.)
7. We suggest covering the top of motor with a cloth to prevent the
grinding dust from getting into the motor.
8. A safety guard easily improvised from section of radiator hose,
with oil applied on inside surface aids in catching abrasive and at the
same time acts as safety guard. (Fig. 5) Do not get oil on grinding
9. Select driver of recommended speed for the size of grinding
Place the lifting spring on pilot and
10. Insert driver spindle in holder. (Fig. 7.)
bring the wheel up to speed before
11. No pressure is required when grinding. Do not slow down the
driver. Support the weight and let it run at high speed.
NOTICE: When grinding, sway the top of the driver gently from side
to side (about 1/4" off center to each side), and note the "Dual Action"
cutting ability, grinding speed and finish. Do not use pressure when
grinding-let the wheel do the cutting.
Some valve seat material will grind slower than others. Frequent
dressing of the wheels is essential for fast, accurate grinding,
particularly on valve seats that are very hard and tough to grind.
12. Cars with rear cylinder against the dash often present a problem.
To overcome this trouble use Short Holders (No. 1672-BB) and Short
Pilots. You must also have No. 1718-C Short Pilot for dressing tool.
See Set No. 1763-BB in catalog as auxiliary set.
No. 1710 Drivers with serial numbers over 600,000 have a 15angle
and with Short Holders and Pilots should get into the closest places.
Some mechanics put a dent in cowl, or slide engine forward to
overcome this trouble when an emergency arises.