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Part numbers... (archive)

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Posted by JamesM on September 15, 2000 at 11:47:23:

In Reply to: Re: Alternator mount wear/failure posted by Doug on September 15, 2000 at 08:54:25:

Hey James, I have had a squealing alternator belt on and off for the past year. I'll tighten the belt up and after a few weeks it'll start it again. I guess it's time to do something about it. I'll order urethane bushings from BMP, did you have any trouble getting them to fit the alternator, I'd imagine it's a tight sqeaze? Do you have the P/N s for the factory replacement pieces (brackets, etc.)? Thanks...


I actually did not replace the bushings in all of the ordeal. The car had recent OEM bushings put in. I have done it before a long time ago. Unless you have a vice, you may have trouble pressing things back together. The sleeves fit very tightly in Korman's urethane bushings. The bushings I did not put in were from Turner, and I don't like them. They're VERY HARD, almost like plastic or delrin. I "borrowed" them from a friend, and I think I'll be giving them back. Korman's are quite a bit softer than Turner's, but hard compared to the OE.

As for part numbers, you need some or all of the following:

Bracket (bolts to engine), 12 31 1 284 306 Replace if your holes are anything but perfectly round.

Steel sleeve x 2, 12 31 1 276 227, only needed if the bores appear damaged, not likely unless it's very neglected

Circlip for above x 2, 12 31 1 276 226, don't reuse your old ones, they weaken and fall off.

OEM Rubber bushings are 12 31 1 268 433, need 4 if you don't want hard urethane

Adjust bar, 12 31 1 312 137, check yours for cracks, damaged teeth, etc.

Upper Pivot bolt, M8 x 80, 07 11 9 912 558, yours may be damaged, hopefully not badly damaged

Lower adjustment bolt, M8 x 80, 12 31 1 276 516, inspect for damage, most likely not damaged

Adjuster gear/nut, M8, 12 31 1 273 639, inspect for damaged teeth (common)

Self locking nut x 2, M8, 07 12 9 946 400, or any good self locking M8 x 1.25 nut will do.

If your car is as old as mine, you may want to get a can of Gunk brand Engine Degreaser. Works wonders on thick black gunk stuck to the timing covers. Just use a parts brush on the heavier deposits. Also get a tube of silicone grease for the rubber or urethane bushings. Spark plug "dielectric" grease is suitable if you have that already. It helps everthing go together a little more smoothly. Or grab the K-Y out of your nightstand...

And don't forget to remove the battery ground cable. The red wire at the back of the alternator is HOT at all times.

88 M3 Henna

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