Posted by Marco on April 25, 1998 at 16:46:09
In Reply to: Counter balanced crankshaft
posted by Tom on April 25, 1998 at 15:23:53
25 lbs may be excessive, but I have no experience to say for sure. It also depends on where it was removed. Weight towards the outside has more impact than weight near the center. You should have some weight removed to compensate for the added weight to the crankshaft.
The flywheel should always be checked for eccentricity and wobble as directed in the Feb. 1928 Service Bulletin. The original limit was .005" on either spec. With parts that have been machined you will usually find that neither the crankshaft or flywheel are concentric, and the flywheel will be closer one way than if rotated 180 degrees. Also be very careful in checking for burrs on the mating surfaces. The smallest burr will add considerable wobble to the flywheel.
Once the best position is determined, It should be marked for location and the crankshaft, flywheel, and pressure plate should be balanced as a unit. Even with the lightened flywheel you shouldn't have the vibration as described.
Please let us know how you come out. Good Luck,