After reading all about the possibility of bearing failures of the "old" style 602/603 pumps, I decided to pro actively change the pump. I think it was not a day too soon. One of the two bearings had 2 balls right next to each other. The basket that was spacing the balls was failing!
Oh, and never forget to take out the allen wrench from the fan before you start the engine!! :=) Don't ask ............

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1991 300D 2.5 Turbo (185000 miles)
2002 BMW 330 cic (65000 miles)
2000 Vulcan Classic 1500 (47000 miles)

Excellent save.

WE all have done things like leaving an allen on the fan when starting up....dumb luck saves us when all else fails.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Good plan, this is one of those cases where a little preventative maintenance can save you a world of hurt.

Or how about leaving the chuck key in the chuck of a Bridgeport mill! Punched a clean hole in the sheetrock on the other side of the shop some twenty feet away.