Replacing the two-part rear main seals or crank seals (crankshaft seals) on my 2000 BMW R1100R oilhead engine. Same sort of process for R1150 engines even with the single seal. Not a difficult job, just be careful/methodical and don’t force things. It is also a great opportunity to take a few other bist apart and have a good clean up while you are in there.

The clutch on this bike had recently been replaced (thankfully no contamination from this seal issue) but I would probably have changed it if it was still the original (57k miles on this bike - one of three oilheads I own at the minute). It’s a recent arrival to the stable with good history but look at the state of that inner seal - what sort of job is that? Looks pretty old to me, if not the original…

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