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B&C Boss mounted altenator...

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mburbidg(at)gmail.com
Guest

Posted: Fri Aug 31, 2012 6:39 pm Post subject: B&C Boss mounted altenator...

Folks,



I just got my "pre-owned" engine mounted to my RV-9A this week. The engine is an O320-D3G and it came out of a certified aircraft. It had a large certified alternator on it, made by Chrysler, interestingly enough. I purchased a B&C 40 Amp alternator to replace it. I thought it would be a direct replacement for the certified alternator. The certified alternator is boss mounted.

When I took the old alternator off and tried to put the B&C alternator on, I immediately noticed that the mounting brackets were very different. The old brackets consisted of three separate brackets. There's a long bracket in the rear, then one that the alternator hangs directly under and finally a strap that ties the starter to alternator bracket. All three brackets are much shorter than the single bracket that came with the B&C alternator. I've enclosed a few pictures.

Do I have to try and fabricate the rear bracket and the starter-altenator strap to match the B&C alternator? I don't really have the equipment or know how to fabricate steel brackets. The material is at least 1/4 inch thick.

Any help or suggestions?

Thanks,

Michael-

[img]cid:56B1F713-A30B-4AAA-9DBD-C6813E827D40[/img]

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handainc(at)madisoncounty
Guest

Posted: Fri Aug 31, 2012 7:19 pm Post subject: B&C Boss mounted altenator...

#1 - See if you can drill new mounting holes in the "U" bracket mounted to the case  to reposition the bracket so that it will mount up with the attachment bracket on the alternator.  

#2 If that won't work, see if you can find a steel spacer that will take up the space between the U bracket and the attachment bracket on the alternator.  1/8" inch pipe might work, cut to size with a hack saw, washers on each end.  Then use a bolt of proper length to tie everything together.  



The latter solution is not elegant, but should cause no problems.  



M. Haught 

On Aug 31, 2012, at 9:37 PM, Michael Burbidge wrote:



 	  Quote: 	
		   Folks,

 

 I just got my "pre-owned" engine mounted to my RV-9A this week. The engine is an O320-D3G and it came out of a certified aircraft. It had a large certified alternator on it, made by Chrysler, interestingly enough. I purchased a B&C 40 Amp alternator to replace it. I thought it would be a direct replacement for the certified alternator. The certified alternator is boss mounted.

 

 When I took the old alternator off and tried to put the B&C alternator on, I immediately noticed that the mounting brackets were very different. The old brackets consisted of three separate brackets. There's a long bracket in the rear, then one that the alternator hangs directly under and finally a strap that ties the starter to alternator bracket. All three brackets are much shorter than the single bracket that came with the B&C alternator. I've enclosed a few pictures.

 

 Do I have to try and fabricate the rear bracket and the starter-altenator strap to match the B&C alternator? I don't really have the equipment or know how to fabricate steel brackets. The material is at least 1/4 inch thick.

 

 Any help or suggestions?

 

 Thanks,

 Michael-

 

 <IMG_0805.jpg>

 <IMG_0806.jpg><IMG_0807.jpg>

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tim2542(at)sbcglobal.net
Guest

Posted: Fri Aug 31, 2012 7:27 pm Post subject: B&C Boss mounted altenator...

You just need to call B&C and have them send you the right one. They have two different mounts. Case & Boss. Don't recall which is which, but they will fix you up.

Tim



Sent from my iPad



On Aug 31, 2012, at 7:37 PM, Michael Burbidge <mburbidg(at)gmail.com> wrote:



 	  Quote: 	
		   Folks,

 

 I just got my "pre-owned" engine mounted to my RV-9A this week. The engine is an O320-D3G and it came out of a certified aircraft. It had a large certified alternator on it, made by Chrysler, interestingly enough. I purchased a B&C 40 Amp alternator to replace it. I thought it would be a direct replacement for the certified alternator. The certified alternator is boss mounted.

 

 When I took the old alternator off and tried to put the B&C alternator on, I immediately noticed that the mounting brackets were very different. The old brackets consisted of three separate brackets. There's a long bracket in the rear, then one that the alternator hangs directly under and finally a strap that ties the starter to alternator bracket. All three brackets are much shorter than the single bracket that came with the B&C alternator. I've enclosed a few pictures.

 

 Do I have to try and fabricate the rear bracket and the starter-altenator strap to match the B&C alternator? I don't really have the equipment or know how to fabricate steel brackets. The material is at least 1/4 inch thick.

 

 Any help or suggestions?

 

 Thanks,

 Michael-

 

 <IMG_0805.jpg>

 <IMG_0806.jpg><IMG_0807.jpg>

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mburbidg(at)gmail.com
Guest

Posted: Fri Aug 31, 2012 7:56 pm Post subject: B&C Boss mounted altenator...

I will call them, but it is not a problem of boss vs. case. My engine has a boss mount and the alternator from B&C is a boss mount. The problem is that they only supplied 1 of 3 pieces to the boss mount. Now it may be that the alternator is light enough that it doesn't need the other two pieces. I don't know if the tie to the starter is to support the starter or the alternator. And maybe the rear bracket isn't required for the B&C alternator. It that's the case it would be good for the instructions to mention this.

Thanks,

Michael-

On Aug 31, 2012, at 8:26 PM, Tim Andres wrote:

 	  Quote: 	

 You just need to call B&C and have them send you the right one. They have two different mounts. Case & Boss. Don't recall which is which, but they will fix you up.

 Tim

 Sent from my iPad

 On Aug 31, 2012, at 7:37 PM, Michael Burbidge <mburbidg(at)gmail.com> wrote:

> Folks,

> 

> I just got my "pre-owned" engine mounted to my RV-9A this week. The engine is an O320-D3G and it came out of a certified aircraft. It had a large certified alternator on it, made by Chrysler, interestingly enough. I purchased a B&C 40 Amp alternator to replace it. I thought it would be a direct replacement for the certified alternator. The certified alternator is boss mounted.

> 

> When I took the old alternator off and tried to put the B&C alternator on, I immediately noticed that the mounting brackets were very different. The old brackets consisted of three separate brackets. There's a long bracket in the rear, then one that the alternator hangs directly under and finally a strap that ties the starter to alternator bracket. All three brackets are much shorter than the single bracket that came with the B&C alternator. I've enclosed a few pictures.

> 

> Do I have to try and fabricate the rear bracket and the starter-altenator strap to match the B&C alternator? I don't really have the equipment or know how to fabricate steel brackets. The material is at least 1/4 inch thick.

> 

> Any help or suggestions?

> 

> Thanks,

> Michael-

> 

> <IMG_0805.jpg>

> <IMG_0806.jpg><IMG_0807.jpg>

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Sep 01, 2012 7:08 am Post subject: B&C Boss mounted altenator...

At 10:55 PM 8/31/2012, you wrote:

 --> AeroElectric-List message posted by: Michael Burbidge <mburbidg(at)gmail.com>



 I will call them, but it is not a problem of boss vs. case. My engine has a boss mount and the alternator from B&C is a boss mount. The problem is that they only supplied 1 of 3 pieces to the boss mount. Now it may be that the alternator is light enough that it doesn't need the other two pieces. I don't know if the tie to the starter is to support the starter or the alternator. And maybe the rear bracket isn't required for the B&C alternator. It that's the case it would be good for the instructions to mention this.

   

         Your boss mount kit as-shipped should have

         these parts in it:



   



         There use to be a third part, a strut that

         ran from the prop-most end of the mount to

         a lug on the starter 



 [img]cid:.0[/img]



         The lug is still present on the B&C light

         weight starters.



         If I recall correctly, that extra strut

         and the companion mounting lug on the

         starter are artifacts of the time when

         generators had overhang moments to cry

         for . . . and a time when Lycoming factory

         mounting brackets were about 3/16" thick.



         At different points in time, the brackets

         were up-sized to the present 1/4" material

         and generators were replace with lighter

          alternators (but with, shall we say,

          intermediate values of overhang moment?)

         and replaced again with the modern,

         still lighter alternators common today.

         

         The B&C starter still replaces a Prestolite

         Pig on airplanes fitted with generators.

         Hence, the lug is present to accommodate

         that configuration. The lug would still

         be useful on the PA28-181 I used to fly

         a lot where the alternator was an

         alternator but one of those things we called

         a 'pancake' . . . large diameter and with

          significant overhang. The brackets were

         still 3/16" material and we would break

         one about once a year.



         Certainly do check with B&C but I think

         my recollection is correct in offering

         the notion that the strut between

         alternator and starter is no longer

         necessary in light of incremental changes

         of weight, size and robustness of the

          contemporary accessories.



         You mentioned that your attache kit had

         only one of three parts? There should

         be two structural components. The mount

         and a tension arm as illustrated in the

         image above taken from the B&C website.



 

         Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Sep 01, 2012 7:54 am Post subject: B&C Boss mounted altenator...

At 09:37 PM 8/31/2012, you wrote:

Folks,



I just got my "pre-owned" engine mounted to my RV-9A this week. The 

engine is an O320-D3G and it came out of a certified aircraft. It had 

a large certified alternator on it, made by Chrysler, interestingly 

enough. I purchased a B&C 40 Amp alternator to replace it. I thought 

it would be a direct replacement for the certified alternator. The 

certified alternator is boss mounted.



When I took the old alternator off and tried to put the B&C 

alternator on, I immediately noticed that the mounting brackets were 

very different. The old brackets consisted of three separate 

brackets. There's a long bracket in the rear, then one that the 

alternator hangs directly under and finally a strap that ties the 

starter to alternator bracket. All three brackets are much shorter 

than the single bracket that came with the B&C alternator. I've 

enclosed a few pictures.



         You are the proud possessor of the "Pig-n-Pancake"

         starter-n-alternator configuration I cited in my earlier

         posting.  "Proud" is not necessarily a given, if

         in error please forgive my presumption.



         The setback distance (pulley centerline to front face

         of mounting ears), overhang moments and tension arm

         geometries in the world of alternators is a bag

         of scrambled eggs.



         If your existing bracket is 1/4" material -AND-

         steel, then it's structurally sufficient. You can

         explore its retention by putting a long bolt through

         the bracket and the B&C alternator and use the

         intended belt to see if the bracket/alternator

         combination can be 'jeeped' for proper set-back

         by crafting a set of spacers. The spacers should be

         snug on the bolt and square, flat ends. Lathe-cut

         parts come to mind.



         If that works, check the tension arm geometry. That

         part is easier to make than the brackets but again,

         they're steel and not the nicest stuff to work with

         using ordinary shop tools.



         Depending on your $time$, talents and resources,

         you might be motivated to order the bolt-and-fly

         kit from B&C.

   Bob . . .

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