Um... I'm going to change my belts tomorrow and I purchased four quality belts. Go to look what I'll be getting myself into tomorrow and the agua pump pulley appears to have two grooves while the alt pulley has a single?!

Is this normal or has my alt been replaced and consequntly gotten a non OE pulley? Or is something else amiss I'm not aware of... Seems odd why the H²O pulley has dual grooves to me.

If it is indeed supposed to have a dual groove pulley, would it be in my best interest to install the proper on in its place?

Thanks!

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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