I know what your talking about now.That's a really uncommon failure. I wonder if road debris damaged it or something? It appears to be a special order part. Allparts Express and Fastlane don't have it listed in their online catalog, nor do any of my normal parts suppliers. So either special order or a good used one.....

I would imagine the crank pulley has to come off to R&R the harmonic balancer. Maybe the harmonic balancer is part of the crank pulley? Not sure.

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1991 300E - 212K and rising fast...