Question…. What water pump pulley size do you have on your 1984 or 1985 w123 300D with a plastic 9 blade fan?

The reason I am asking is I upgraded a friends ’82 300d with a small water pump pulley and plastic 9 blade fan that I got from an ’84 SD. I was under the impression smaller pulley is used with these fans because I’ve read the 9 blade fans can break using the bigger pulley. I have been using this setup with my car for a few years now, in which I also got it from a w126 300SD. But I remember when I went to get the belt for it (I told them is for an ’85 300D), they gave me the bigger pulley belt - 10 x 1037 and said it is correct for this year car. I ended up going back to get a 10 x 1000 belt.

Forward to this weekend…. Same exact thing happened at a different auto parts company. They gave me a 10 X 1037 and told me this is correct for this car. I believed them, tried to install it and the belt is too big. Crap!

Now before I sold my ’84, I don’t recall it ever having a small pulley even though it had a 9 blade plastic fan. I just never paid attention to it.

I am thinking that the ’84 and ‘85 617.952 (300D) came from the factory with a bigger pulley and the ’84 and ’85 617.951 (300SD) came with the smaller pulley. But only people with those years can tell me.

Thanks in advanced.

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1983 123.133 California
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