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I bought a water pump for my 1979 530i. The pump is identical to the old one except for the pulley flange. The old pump has a "square" bolt pattern (to bolt on the pulley) and the center hub or nose is smaller in diameter. The new pump has a "rectangular" bolt pattern and bigger center circumference. The pulley will not seat all the way down on the flange, plus you can't bolt it down because of the different bolt pattern. Is there another pulley that I need to get or what is the deal? I'm comfused

I'll post a picture of the old water pump and pulley.

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You got sold a water pump for a 80+ car, they used a different fan clutch which used different parts attached to them. The 79/80 changeover date isn't perfect, lots of E23s seemed to use the early style in later years, but I don't think any 79s came with the late fan clutch/water pump.

Mike W. wrote:You got sold a water pump for a 80+ car, they used a different fan clutch which used different parts attached to them. The 79/80 changeover date isn't perfect, lots of E23s seemed to use the early style in later years, but I don't think any 79s came with the late fan clutch/water pump.

so can I get a later model pulley and call it a day?

Danval wrote:

Mike W. wrote:You got sold a water pump for a 80+ car, they used a different fan clutch which used different parts attached to them. The 79/80 changeover date isn't perfect, lots of E23s seemed to use the early style in later years, but I don't think any 79s came with the late fan clutch/water pump.

so can I get a later model pulley and call it a day?

No, you would also need a later type fan clutch, which is much cheaper but not as long lived as the original type.

I got an early style water pump from FCPEuro.com

They're out there, you just have to be careful. You want the one with the flat nose, not the raised threaded nose. Or reference a bolt on clutch, not screw on.

http://www.autohausaz.com/search/produc ... ter%20Pump