I have coolant dripping from the weep hole on my '79 240D water pump. If it were an American car it would be simple: put on a new PUMP (all one unit). Should I replace the "water pump" (looks like impeller & shaft in the picture) and/or the "housing"? Any advice is most appreciated.

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Now you're suckin' Diesel!

'88 300SEL
'92 300D 2.5 Turbo
'96 Lincoln Town Car. The Jazzmobile.