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Saturday, September 26, 2009

Knock-knock

E28 Diff mount, old and new

Who's there?
Diff mount (thanks to wise folks at MyE28.com for helping to pinpoint the problem).

Symptoms: heavy sharp knocking sound when sharply dropping off the gas, or accelerating in reverse.

Cause: rubber in the diff mount (part #33171125290) has split apart.

Advice given: don't replace it with the same part (around $200 today), replace it with part #33171129786 (around $80 today), rationale being, quote:
If you replace your diff mount three times in the same time it takes for the 535 one to break, you break even. Chances are you won't be doing that. In fact, I'd be very surprised if that was in fact the case. -- ck"
It is interesting, though, that the part that failed seems to be that very part, not the original #33171125290. If that's the case (will know for sure when the part arrives), it's time to start counting.

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