Alternator Bracket - Wrong parts?
Posted: May 09, 2016 1:57 PM
I'm in the process of re-building my 87 535. The motor will end up being a combo of B34 and B35 parts, but relevant to this question, the bock, alternator and alternator supporting bracket are all off of the original B34 motor that was in the car.
Yesterday when I went to reinstall the alternator supporting bracket, I ran into some strange stuff. I'm now pretty nearly certain that at some point in the car's past, the wrong alternator adjusting bar (BWM part #12311714922, item #12 in this RealOEM diagram) was installed. When I took the current adjusting bar off of the supporting bracket, the rear flange of the adjusting bar with the welded-on bolt in the pics had been bent back to allow it to fit onto the supporting bracket. When I bent it back, the adjusting bar opening is about 2-3mm narrower than the mounting flange that it's supposed to fit onto.
Further, note in the pic below that the supporting bracket is threaded where it butts up next to the adjusting bar. The RealOEM diagram shows that the securing nut is separate from the adjusting bar. And this design (two adjacent parts that are both threaded) would prevent them from being tightened up together when you install the through-bolt. And indeed, the bolt that was in there fit pretty badly.
So, is this the wrong adjusting bar? Or maybe (worse) is the supporting bracket the wrong one? (Note that the numbers on the supporting bracket don't match any BMW part numbers that I can find, but I'm probably not decoding the number pattern on the part correctly.)
Conceivably I could make this adjusting bracket work (grind off the nut, bend the rear mounting flange, use a new securing lock nut), but that doesn't seem like the way to go at this point.
Adjusting bar doesn't fit onto supporting bracket:
Both parts have adjacent threaded holes ... can't be right:
Part number on supporting bracket is 1.1 1 1 274 579.9?:
Yesterday when I went to reinstall the alternator supporting bracket, I ran into some strange stuff. I'm now pretty nearly certain that at some point in the car's past, the wrong alternator adjusting bar (BWM part #12311714922, item #12 in this RealOEM diagram) was installed. When I took the current adjusting bar off of the supporting bracket, the rear flange of the adjusting bar with the welded-on bolt in the pics had been bent back to allow it to fit onto the supporting bracket. When I bent it back, the adjusting bar opening is about 2-3mm narrower than the mounting flange that it's supposed to fit onto.
Further, note in the pic below that the supporting bracket is threaded where it butts up next to the adjusting bar. The RealOEM diagram shows that the securing nut is separate from the adjusting bar. And this design (two adjacent parts that are both threaded) would prevent them from being tightened up together when you install the through-bolt. And indeed, the bolt that was in there fit pretty badly.
So, is this the wrong adjusting bar? Or maybe (worse) is the supporting bracket the wrong one? (Note that the numbers on the supporting bracket don't match any BMW part numbers that I can find, but I'm probably not decoding the number pattern on the part correctly.)
Conceivably I could make this adjusting bracket work (grind off the nut, bend the rear mounting flange, use a new securing lock nut), but that doesn't seem like the way to go at this point.
Adjusting bar doesn't fit onto supporting bracket:
Both parts have adjacent threaded holes ... can't be right:
Part number on supporting bracket is 1.1 1 1 274 579.9?: