Quote:
Originally Posted by tinypanzer
Have you checked the bearings in the distributor? My 560SEL sounded like that right before the distro went out.
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Argh, that's one of my dumber suggestions since the M103 doesn't have an actual distributor per se, just that cam shaft attachment. My next guess would have been water pump, but you said you ran it without the serpentine...
I'll poke around in my 300SE when I get home and see if I can think of anything.