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Mac clutch keyway plan B
#9
Hi Bill,
Disclaimer: I have less first-hand Mac experience than any of the previous posters, but here goes:


  1. Instructions for Hartman clutch said "260 - 300 in*lbs, NO TIGHTER."  (In that case, the limitation was the crank threads. In your case, it will be your nut's paper-thin wall thickness.)
  2. I would never attempt a DIY weld repair on one of these cranks.  The metallurgical changes would be a train wreck.
  3. I can't imagine good things coming from adding a 2nd keyway.  Not much meat, plus notch-sensitivity.
  4. That leaves the keyless lapping method.  Many guys have had good success with it (I'm still aspiring for that).  Some guys' recipes also include adding one drop of blue (#242) Loctite to the taper.

See you later!
Doug
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Messages In This Thread
Mac clutch keyway - by Bill Peck - 04-20-2018, 09:43 AM
RE: Mac clutch keyway plan B - by Bill Peck - 04-21-2018, 03:50 PM
RE: Mac clutch keyway plan B - by steve welte - 04-21-2018, 07:26 PM
RE: Mac clutch keyway plan B - by David Luciani - 04-21-2018, 08:10 PM
RE: Mac clutch keyway plan B - by thomas kelley - 04-22-2018, 08:57 PM
RE: Mac clutch keyway plan B - by doug tenney - 04-23-2018, 06:13 AM
RE: Mac clutch keyway plan B - by David Luciani - 04-23-2018, 11:57 AM
RE: Mac clutch keyway plan B - by Bill Peck - 04-24-2018, 05:06 PM
Mac clutch keyway plan B - by Bill Peck - 04-20-2018, 11:24 AM
RE: Mac clutch keyway plan B - by steve welte - 04-20-2018, 11:33 AM
RE: Mac clutch keyway plan B - by David Luciani - 04-20-2018, 08:31 PM

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