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Triple groove P/S pump pulley ?

tarussell

tarussell

“Seven years of college down the drain”
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Fellas, I need to know if anyone has an application for a triple groove pulley for a Saginaw power steering pump with a standard 3/4” press on center bore.
I’ve tried searching for some 70’s Buick, Pontiac & Caddy big inch motors as well as Chevy stuff but all I come up with is double groove pulleys.
I seem to recall some tri-groove pulleys from back in the day but don’t recall what they were on.

As the picture shows the two most outer grooves are closer together than the inner most groove that was common on pulley drives in the 70’s.

If anyone knows of an application please let me know - Thanks!

IMG_2730.jpeg
 
Would the C60’s still use common “V” belt automotive width and taper type belts?
I haven’t put a belt gauge on any medium duty pulleys yet to verify.

Those big truck Saginaw pumps are the “143” type but I think they still used a 3/4” common size shaft. It’s worth look’n into.
 
Bent77 said:
Yep, c60 type cabs and such because they had air compressors
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I just went in the garage and checked an old 1986 model C60 T/D 427 P/S 143 type pump that I scavenged and it’s only a single groove pulley - the crank & water pump had an extra bolt on pulley setup for the air compressor though.
 
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Damn good idea !

I’ve been doing some initial research on the medium-duty pulleys as Bent suggested as well as the early HMMV pulleys as KENNYW suggests and unfortunately from what all I’ve learned is that the C60 stuff uses wider 1/2” belts instead of the 7/16” & 3/8” K/C-20/30 pulleys.

And the HMMV’s 4-groove positioning spacing is not the same as what I need.
My harmonic balancer has the grooves machined into it so I can’t just swap out a different crank pulley to match the others - so this means I may have to stick with a 2-groove pulley.

Appreciate the help on this !

IMG_2811.png

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Curious as to why a double groove won't work.
 
It will - I was trying to tie in all three belts for the Alt, P/S & W/P for maximum grip on the pump pulley since I am restricted to regular V belts due to the crank pulley actually being the harmonic balancer instead of a separate pulley.
I’m sure the double groove setup will work out well but I was just exploring my possible options - turns out not to be an option after all.
Now the third most outer groove is available for the A/C.
 
nvrenuf said:
I was wondering what you were up to.
Click to expand...
Just try’n to make the little motor as functional as possible wherever possible.
That first picture of the dirty motor showing the pulleys is from that 78 K30 Tow Truck that your rear springs came from.
 
tarussell said:
Just try’n to make the little motor as functional as possible wherever possible.
That first picture of the dirty motor showing the pulleys is from that 78 K30 Tow Truck that your rear springs came from.
Click to expand...
You just need the right belt

Race Belts

bds-sales-com.3dcartstores.com
 
I've heard of this new-fangled thing called "serpentine". Who knows if that will catch on.
 
Blue85 said:
I've heard of this new-fangled thing called "serpentine". Who knows if that will catch on.
Click to expand...
That would have been a superior setup but that damn harmonic/pulley combo has got me bent over and bit’n a pillow… ( I cleaned that statement up a little ).
 
tarussell said:
It will - I was trying to tie in all three belts for the Alt, P/S & W/P for maximum grip on the pump pulley since I am restricted to regular V belts due to the crank pulley actually being the harmonic balancer instead of a separate pulley.
I’m sure the double groove setup will work out well but I was just exploring my possible options - turns out not to be an option after all.
Now the third most outer groove is available for the A/C.
Click to expand...
In my experience 2 belts can be tensioned to get a good grip, but with 3, one will not get tight enough. It’s not worth your effort
 
imiceman44 said:
In my experience 2 belts can be tensioned to get a good grip, but with 3, one will not get tight enough. It’s not worth your effort
Click to expand...
In this application the three belts would all be different lengths going around separate accessories with the P/S,ALT, W/P & crank pulleys being common to all belts so equal tension on that pulley wouldn’t be an issue.

As it is though there will still be separate lengths for all belts with just two going around the P/S pulley - one going from crank to ALT to P/S to W/P and the other adds the A/C pulley but bypasses the ALT.
The one I was trying to add was the third belt that only wraps around the crank to ALT to W/P pulleys.

I agree that common length belts wrapped around shared pulleys can be an issue if the belts are not all from the same batch run while being made.
In the end I’ll have two belts going around everything but the air compressor pulley with each belt having different lengths so all should work out well.
 
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