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clare wrote:
> On 23 Jul 2006 21:21:19 -0700, "abripl" <ignord_eml@hotmail.com>
> wrote:
>
> >One known problem is that aircraft engines turn CCW looking at the prop
> >but auto alternators have cooling fins optimized for CW. But thats not
> >apparently as much a problem as the pulley nut potentially comming
> >loose. For CW rotation the engine torque will tend to tighten the
> >pulley nut but for CCW it will tend to loosen it. It happened to me
> >today )on the ground) after 60 hours of use and the alternator was not
> >charging just spinning the pulley. Make sure you check your pulley nut
> >tightness ocassionally if you are using an auto alternator.
>
>
> Are you telling me that all the aircraft versions of alternators have
> left hand threads? Or even that alternators on engines that run
> "backwards" or have the alternator on the back of the engine(like on a
> Renault R12) have left hand threaded rotors?
> I am afraid I would have to dissagree. Not ALL do. Perhaps SOME.
> On counter-rotating marine engines, both alternators are the same.
>
> --
> Posted via a free Usenet account from http://www.teranews.com
They're all right-hand thread, even when used on a Lycoming and
turning "backwards." The fan has straight fins rather than the angled
fins found on some auto alternators.
I ran an alternator backwards on my inboard boat for years,
since there was no room alongside the engine for it and it had to go
out front and sit backwards and therefore turn the "wrong" way. The
thread never came loose, and the fan had straight fins that I got off
some alternator in the junkyard. Some cars had them that way.
Dan
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Re: Problem with auto alternators
