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CJ-6 allternator failure

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pfstelwagon(at)earthlink.
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Posted: Mon Sep 17, 2012 5:32 pm Post subject: CJ-6 allternator failure

If I remember correctly that was an old mod that somebody  was pushing to use GM 24 volt truck alternators.  Basically they used the  front of a CJ generator shaft grafted on the front of the GM alternator to get  the correct drive.  Since there is no oil seal in the CJ drive (it is in  the generator) they glued the alternator into the CJ cavity with RTV or  something similar and relied on the alternator sealed front bearing for the oil  seal.  As you say no over-voltage protection for expensive avionics and  your battery.  I think Jim Selby had one kicking around in his hangar at  one time, don't know what happened to it as no one wanted to use it.  From  what I have seen of the B&C setup it is the way to go.

  

 Frank

   [quote][b]

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brian(at)lloyd.com
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Posted: Mon Sep 17, 2012 8:22 pm Post subject: CJ-6 allternator failure

On Mon, Sep 17, 2012 at 6:29 PM, Frank Stelwagon <pfstelwagon(at)earthlink.net (pfstelwagon(at)earthlink.net)> wrote:

 	  Quote: 	
		          If I remember correctly that was an old mod that somebody  was pushing to use GM 24 volt truck alternators.  Basically they used the  front of a CJ generator shaft grafted on the front of the GM alternator to get  the correct drive.  Since there is no oil seal in the CJ drive (it is in  the generator) they glued the alternator into the CJ cavity with RTV or  something similar and relied on the alternator sealed front bearing for the oil  seal.  As you say no over-voltage protection for expensive avionics and  your battery.  I think Jim Selby had one kicking around in his hangar at  one time, don't know what happened to it as no one wanted to use it.  From  what I have seen of the B&C setup it is the way to go.



	




I had the 24V GM alternator on my CJ. The mod was done by Yakity Yaks. They used an adaptor plate with a shaft seal in it to prevent oil loss, which seemed to me like a reasonable approach. I was concerned about the lack of OV protection and had started on designing OV protection when I sold my plane.

 



It is possible to provide OV protection for an internally-regulated alternator by providing an alternator contactor that opens in the case of an OV event, disconnecting the alternator from the bus. There is a good chance that the diodes and possibly the regulator in the alternator will fail in that case but replacing those components is relatively easy and far cheaper than even replacing the battery, let alone all the other electrical components. After all, we are talking about a failed alternator anyway so having to replace the diodes and regulator module is a small price to pay. 

 



It is also relatively easy to remove the internal regulator module and bring the field connection out to the #1 and #2 terminals to make it easy to connect to an external regulator. 

 But if one wants a turn-key solution, I have to agree that B&C is far and away the best.



-- 

Brian Lloyd, WB6RQN/J79BPL

3191 Western Dr.

Cameron Park, CA 95682

brian(at)lloyd.com (brian(at)lloyd.com)

 +1.767.617.1365 (Dominica)

+1.916.877.5067 (USA)



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dave(at)davelaird.com
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Posted: Mon Sep 17, 2012 8:45 pm Post subject: CJ-6 allternator failure

I have Brian's great CJ... I did end up replacing the Delco with the B&C..

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