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#1
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Problem with auto alternators
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. |
#2
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Problem with auto alternators
On 23 Jul 2006 21:21:19 -0700, "abripl"
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'm afraid I'd 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 |
#3
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Problem with auto alternators
clare wrote: On 23 Jul 2006 21:21:19 -0700, "abripl" 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'm afraid I'd 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 |
#4
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Problem with auto alternators
clare at snyder.on.ca wrote:
On 23 Jul 2006 21:21:19 -0700, "abripl" 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'm afraid I'd have to dissagree. Not ALL do. Perhaps SOME. On counter-rotating marine engines, both alternators are the same. Corvairs do--both the old generators and the newer alternators. some loc-tite goes a Loong way in these situations..Jerry |
#5
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Problem with auto alternators
On Mon, 24 Jul 2006 21:42:43 GMT, jerry wass
wrote: clare at snyder.on.ca wrote: On 23 Jul 2006 21:21:19 -0700, "abripl" 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'm afraid I'd have to dissagree. Not ALL do. Perhaps SOME. On counter-rotating marine engines, both alternators are the same. Corvairs do--both the old generators and the newer alternators. some loc-tite goes a Loong way in these situations..Jerry Corvair has left hand thread on alternator????? None that I've seen, and the manual does not mention it - and the rotor is the same as any other Delcotron. -- Posted via a free Usenet account from http://www.teranews.com |
#6
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Problem with auto alternators
clare at snyder.on.ca wrote in message ... On Mon, 24 Jul 2006 21:42:43 GMT, jerry wass wrote: clare at snyder.on.ca wrote: On 23 Jul 2006 21:21:19 -0700, "abripl" 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'm afraid I'd have to dissagree. Not ALL do. Perhaps SOME. On counter-rotating marine engines, both alternators are the same. Corvairs do--both the old generators and the newer alternators. some loc-tite goes a Loong way in these situations..Jerry Corvair has left hand thread on alternator????? None that I've seen, and the manual does not mention it - and the rotor is the same as any other Delcotron. -- Posted via a free Usenet account from http://www.teranews.com I really doubt that there were any left hand threads on small alternators, but there were a number of auto engines that rotated in the opposite direction. IIRC rear drive Chryslers used to rotate backward of GM, and I believe that Honda currently rotates the reverse of most other front drives due to the reversed position of the engine and drive train. I hope this helps. It should at least net an appropriate fan. Peter |
#7
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Problem with auto alternators
"Peter Dohm" wrote in
t... I really doubt that there were any left hand threads on small alternators, but there were a number of auto engines that rotated in the opposite direction. IIRC rear drive Chryslers used to rotate backward of GM, and I believe that Honda currently rotates the reverse of most other front drives due to the reversed position of the engine and drive train. Majority of the world's automotive engines rotate clockwise then viewed from the accessory end. Chrysler and GM engines (small and big blocks) as well as AMC, Ford etc. do rotate the same direction. In fact I don't know any auto engines running counterclockwise, but that doesn't mean they don't exist. JP |
#8
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Problem with auto alternators
On installations with rear mount alternators like Cont io/o 470s
in Skylanes, and such, the alternator turns backwards. There is a special pulley with the fan fins in the opposite direction. If you use automotive stuff, you will find that the fins are backwards and the centerline of the belt is about 1/8" farther from the alternator case than it is on the aircraft one. Needless to say, the alternator could care less which direction it is turning. Bill Hale A&P abripl 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. |
#9
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Problem with auto alternators
I had a ski buddy in the 50's that had a 2-cycle Saab. He liked to park
uphill and coast backward in a forward gear and pop the clutch. Then he had several reverse gears and one forward. It reminds me of my favorite episode on "Candid Camera." They had a beautiful buxom blonde trying to park a big car in a supermarket parking lot. She was having problems and would ask men to help her park. Well, these guys would swagger up to help the poor miss out, except, the crew had reversed the steering somehow......so left was right. It was hilarious. Karl "Curator" N185KG " wrote in message oups.com... On installations with rear mount alternators like Cont io/o 470s in Skylanes, and such, the alternator turns backwards. There is a special pulley with the fan fins in the opposite direction. If you use automotive stuff, you will find that the fins are backwards and the centerline of the belt is about 1/8" farther from the alternator case than it is on the aircraft one. Needless to say, the alternator could care less which direction it is turning. Bill Hale A&P abripl 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. |
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