Welcome to the Culver Aircraft Forum

Culver Cadet Section => Modifications => Topic started by: Woody on March 23, 2012, 07:05:09 PM

Title: camshaft/timing celeron gear
Post by: Woody on March 23, 2012, 07:05:09 PM
Anyone know anything about the replacement of the cam gear in the AC199E3 from the celeron gear to a metal one?  I read that this was a weak link in this engine.
Title: Re: camshaft/timing celeron gear
Post by: Bill Poynter on March 23, 2012, 09:09:44 PM
Since this is the gear that drives the mags, you should be able to remove one of them and see what you have. 
Title: Re: camshaft/timing celeron gear
Post by: Paul Rule on May 08, 2012, 04:30:12 AM
The bad gear was all celeron (or phenolic) including the teeth... which was what didn't last.  The 'new' gear has an aluminum rim & teeth on a 'celeron' hub.   Franklin Service Bulletin # 17  Feb. 13, 1942  addressed this and said replace them at overhaul (500hrs.)

The rate of wear (failure?) apparently was higher then they thought and with S.B. #21 of Dec. 7, 1942 (1 yr. after Pearl Harbor) they said pull any accessory and replace immediately if not previously done. 

If you have a 4AC-199 S/N 200533 or higher they came with the new gear.  If you have a 4AC-176 S/N 125270 or higher - same thing.

Old gear P/N not given - new gear  P/N 10725   (cost at that time was $6.00 !! )