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  #11  
Old 11-21-2011, 09:47 AM
RV8R999 RV8R999 is offline
 
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Dan, is your eng/prop dynamically balanced? Didn't you have an exhaust crack too?
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  #12  
Old 11-21-2011, 10:48 AM
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Quote:
Originally Posted by RV8R999 View Post
Dan, is your eng/prop dynamically balanced? Didn't you have an exhaust crack too?
Dynamic balance wasn't done until about 20 hrs ago, as it was never a shaker. When we did balance the initial numbers were in fact small. The internals were balanced to within a gnats arse at BPE.

Did have a crack in the 4-into-one collector, and it's now running with a slight mod suggested by the vendor.
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Last edited by DanH : 11-21-2011 at 10:54 AM.
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  #13  
Old 11-21-2011, 07:03 PM
Captain Avgas Captain Avgas is offline
 
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Quote:
Originally Posted by RV8R999 View Post
Dan, is your eng/prop dynamically balanced? Didn't you have an exhaust crack too?
It may well be that Dan's Plane Power alternator itself is not balanced. B&C alternators are individually balanced and I've never heard of this type of failure on a B&C.
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  #14  
Old 11-21-2011, 07:35 PM
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Just a dab of strategically placed silicone would stop this type of vibration.

bird
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  #15  
Old 11-22-2011, 08:18 PM
hudgin hudgin is offline
 
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We had the same problem with ours several times. They replaced it for free every time but the alternator itself would break also. We are close enough to the factory that we could take it there and wait for it. But the frustration of failure and them always saying it was caused by the plane made us switch to a B&C. We had the engine balance checked and it is pretty close to perfect but they would not belive us. The straw that broke was when they said no more warranty. Have had no problems with the B&C but have not flown it much cause of other problems.
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  #16  
Old 11-22-2011, 08:30 PM
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rocketbob rocketbob is offline
 
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Before my -6 became a project again, I had a bit over 1000 hours on a Nippondenso forklift alternator and never had a moment of trouble with it.

Come to think of it, I've never heard of ANY failures with said alternator as I have a number of friends flying with one or very similar variations of ND alternators.

Just curious if anyone else has had problems with stock automotive alternators. Not counting the alternators Van's use to sell...those were junk.
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  #17  
Old 11-23-2011, 06:54 PM
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DanH DanH is offline
 
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Well, a shroud arrived today.

The "new" shroud is aluminum, just like the broken one. There was a note in the box from Jan, the office manager at Plane Power, stating she was mistaken about the shrouds being steel on current production alternators. I find that odd given her first question Monday on the phone was "Aluminum or steel?". And this one has been previously installed on an alternator.

To prevent another failure I'll take two steps. First, a couple well placed dabs of silicone sealant should damp the vibrating cover. Second, the edge of the cover needs to be deburred just like any other airplane part. The old cover appears to have cracked exactly where I find a nice notch on the new one. It should have a label saying "Break Here"

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Last edited by DanH : 11-23-2011 at 07:06 PM.
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  #18  
Old 11-23-2011, 06:59 PM
chaskuss chaskuss is offline
 
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Dan,
If the new one breaks, just put a stock ND steel shroud on it and be done with it.
Charlie
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  #19  
Old 11-23-2011, 07:10 PM
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C-FAH Q C-FAH Q is offline
 
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Quote:

Just curious if anyone else has had problems with stock automotive alternators. Not counting the alternators Van's use to sell...those were junk.
Bob,
Mine didn't make twenty hours and packed it in. On went the B&C and
fine ever since.
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  #20  
Old 11-23-2011, 07:42 PM
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Quote:
Originally Posted by chaskuss View Post
...if the new one breaks, just put a stock ND steel shroud on it and be done with it.
Charlie, got a source?
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