Well the ******** water pump for a 1981 300SD has a center shaft that is too big. It is a GATES #41160. The pump I got from Advance Auto for a 1983 300SD does have the correct shaft size though. Go figure.

Thanks for the advice all.

I'll install an aux water pump on a switch for the heater core for now.

-Tad

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1995 G320
2003 C230 Kompressor Coupe
2005 ML500
2007 ML350