1/4-24 Starter Ring Gear Bolts or Alternatives ???

[henryford2]

I'm installing a "new" starter ring gear that is tapped to 1/4-24. I am not running magnets and may not have room for slingers (Model B crank, stock length with VW oil pump driven from rear of camshaft). From what I've seen vendors often provide a complete set of the correct size bolts with their slingers. Are these bolts available elsewhere, or is there an alternative? I've read that a 6mm bolt with 1mm pitch can be used, as well as rethreading the 1/4-24 thread in the gear to a more common 1/4-28 thread size (can't be good?). Looking for suggestions. Thanks

[speedytinc]

Not sure the 6mm bolts will work with the oversize 1/4-24 threads. Re threading the holes to 1/4-28 may be the way to go. I will try this when my stock of correct ring gears is exhausted. My concern is that the tooth hardness includes the threaded holes. A broken tap would ruin your day. My thoughts.

[henryford2]

From what I have read, I'm guessing the 6mm is only good for the #14-24 thread size, not the 1/4-24. 6mm has a major diameter of .2362, the #14 a .24 and the 1/4-28 at .250. Thanks

[Dan McEachern]

Joe- not sure what style slingers you are using but, these will certainly clear the pump. Also, retapping to 1/4-28 will work.

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[henryford2]

Yes, your style slingers will clear the pump, hoping the triple gear retaining plate does, what size mounting bolts are you using for the slingers? I've retapped an original #14-24 threaded gear for 1/4"-28 but not a new 1/4"-24 one. Thanks, Joe