Need help with crank and water pump pulley combo

[pyroman]

I've been struggling with this for far too long and I thought maybe one of you guys could help. Basically all I want is a 2 groove water pump pulley and a 2 groove crank pulley that will fit a 302. I'm just running an alternator and power steering, no a/c. I've bought 2 or 3 water pump pulleys and 1 2 groove crank pulley. Either the offset between the pulleys is wrong, or the grooves aren't the same size, or they interfere with each other. It's getting pretty frustrating and it's such a stupid problem. The last water pump pulley I bought was a C70E-8509-D, which is the large diameter one. This one is colliding with the crank pulley I just bought. Please help. Thanks.

 

[2+2GT]

Sorry. ALL of the current repro 2-sheave smallblock pulleys are the wrong diameter, almost 1/4" too large. All of the others are right, but you can't mix and match, i.e., you'd think you could use the 3-sheave crank and be done with it, but you'd have to switch to the 2-sheave water pump pulley, too. I suggest you complain to the manufacturer that the 2-sheave is wrong. Complain LOUDLY.

I know, because I compared ALL of the repro pulleys to originals, and they were pretty good, except for the 2-sheave crank.

 

[chockostang]

You have to be running a 65-69, because 70 up were not this fashion.

So, Call me, I'll ask question--Have Your Pulley in Hand- We'll get ya Fixed up.

Dan


Classic Mustang Disc Brake Conversions and Power Steering

 

[pyroman]

I think there may have been some confusion in my first post. The pulleys I have are not reproduction pieces, they are all used original pulleys. My issue is that I just don't know what the correct pulley combination is. I tried guessing but that simply hasn't worked. Which pulleys do I need or would work?

 

[2+2GT]

The offset for all 65-69 pulleys was the same. Maybe you have a 70-up water pump pulley or something.

The PS-no AC setup had a 2-sheave crank pulley and a 1-sheave water pump pulley.

The PS-AC setup had a 3-sheave crank and 2-sheave pump.

Don't mix them. Although the offset never varied, the diameters interfere.

 

[pyroman]

How did the belt routing go for non-A/C with the 1 sheave water pump pulley?

 

[2+2GT]

How did the belt routing go for non-A/C with the 1 sheave water pump pulley?

Aha. The alternator belt went crank - water pump - alternator. The PS belt went crank - PS pump. Looks kinda weird, but that's how it was done.

 

[96 DOHC Cobra]

If the C7OE-D was the correct offset, just too large diameter, then the 2-groove pulley that should work is C6AE-A. It was used on a lot of motors in the 60s small blocks and FE big blocks. It's the same as the C7OE-D pulley, just smaller in diameter. I know I have at least one around here that I can measure.

 

[pyroman]

If the C7OE-D was the correct offset, just too large diameter, then the 2-groove pulley that should work is C6AE-A. It was used on a lot of motors in the 60s small blocks and FE big blocks. It's the same as the C7OE-D pulley, just smaller in diameter. I know I have at least one around here that I can measure.

Yes the C7OE-D was just too big in diameter. Are you using any of the C6AEs? If not, would you sell one to me?

 

[D.Hearne]

If the C7OE-D was the correct offset, just too large diameter, then the 2-groove pulley that should work is C6AE-A. It was used on a lot of motors in the 60s small blocks and FE big blocks. It's the same as the C7OE-D pulley, just smaller in diameter. I know I have at least one around here that I can measure.

Ditto, I can vouch for this, both the FE's and small blocks used the same offset water pump pulleys.

 

[pyroman]

After doing some measuring, I think the issue is with the crank pulley I bought. What would be the correct crank pulley to use with the C70E-8509-D water pump pulley?

 

[D.Hearne]

After doing some measuring, I think the issue is with the crank pulley I bought. What would be the correct crank pulley to use with the C70E-8509-D water pump pulley?

That's an answer only you may find out on your own. Very few people ever pay attention to the engineering numbers of the pulleys. I had the pulley you're after a few years back, but sold it on ebay. I also think you may need a 3 groove pulley to work with that 2 groove. If I remember correctly, that was what was paired on the motor I pulley them off of. It wasn't the original engine in the car (67 Mustang Coupe w 289) but that's what was on it.

 

[Rapid]

The guys at classic auto air had to help me with pulleys when I did an install and they got it right. They may be willing to help.

 

[96 DOHC Cobra]

You could go either way. A smaller crank pulley or a smaller water pump pulley. If you go to a smaller crank pulley, you'll slow dowm the water pump and probably run warmer. A smaller water pump pulley will speed up your water pump and maybe help you run a little bit cooler. Which would you prefer?