Michael Burbidge
Well Known Member
I know that my questions are coming fast an furious, since I got my engine hung. I'm entering territory where there are little or no instructions.
My engine is an O320-D3G and it came out of a certified aircraft. It had a large certified alternator on it (pig-n-pancake), 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 and so is my new B&C alternator.
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, not including the tension arm. First there is a U-shaped bracket that the alternator hangs directly below. This is made of 3/16 inch steel. There's similar L-shaped bracket behind that, that attaches to the case with three bolts. And then there is a short, flat bracket that ties the alternator and the starter together. Here's a picture of the old brackets that mount to the engine case and starter.
The B&C boss mounted alternator comes with a single, U-shaped bracket that the alternator hangs directly below. It has longer arms, than the old U-shaped bracket. Here's a picture of that bracket. It is made of 1/4 inch steel.
Obviously the flat bracket that ties the alternator to the starter will not fit, it is too short for the new U-shaped bracket.
So my question is, how did you mount your boss mount B&C alternator? Did you just remove the L-shaped bracket behind the U-shaped bracket? Did you skip the flat bracket that ties the alternator to the starter?
I'm guessing that the light-weight alternators do not need the same level of support as the old heavy alternators did.
Thanks for any suggestions you might have!
Michael-
My engine is an O320-D3G and it came out of a certified aircraft. It had a large certified alternator on it (pig-n-pancake), 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 and so is my new B&C alternator.
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, not including the tension arm. First there is a U-shaped bracket that the alternator hangs directly below. This is made of 3/16 inch steel. There's similar L-shaped bracket behind that, that attaches to the case with three bolts. And then there is a short, flat bracket that ties the alternator and the starter together. Here's a picture of the old brackets that mount to the engine case and starter.
The B&C boss mounted alternator comes with a single, U-shaped bracket that the alternator hangs directly below. It has longer arms, than the old U-shaped bracket. Here's a picture of that bracket. It is made of 1/4 inch steel.
Obviously the flat bracket that ties the alternator to the starter will not fit, it is too short for the new U-shaped bracket.
So my question is, how did you mount your boss mount B&C alternator? Did you just remove the L-shaped bracket behind the U-shaped bracket? Did you skip the flat bracket that ties the alternator to the starter?
I'm guessing that the light-weight alternators do not need the same level of support as the old heavy alternators did.
Thanks for any suggestions you might have!
Michael-
