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Wanted Fisher Plow Pump Drive Pulley/Sheave

GonicGM

GonicGM

1/2 ton status
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Mar 5, 2011
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Seacoast New Hampshire
Looking for belt drive pump pulley/sheave that mounts behind the fan blade on SBC or BBC. There are two different offsets. I'm looking for the one with less offset. I encountered the one I am looking for on a 87 loaded Suburban, 350 TBI.

May also consider crank drive pulley for BBC as well.
 
Thanks, you've directed me there before.
I found the pulley I was looking for locally used @ $20. I couldn't justify the $180 price tag from Fisher. Ultimately, this pulley may work but won't work well, so I'm changing direction.
 
The Fisher plow drive setup for the pump on my 6.2 comes with a fan mounted pulley that bolts behind the fan clutch,but for whatever reason,whoever mounted the pump & plow on the truck before I got it just used a typical 3 bolt harmonic balancer style add on pulley like the old small blocks used..
When I got the truck the plow pump was lying to one side tied to the fender,someone scoffed the pump brackets..I lucked out and found a 6.2 K5 in a local salvage yard that still had the entire pump,brackets & joystick intact...I never bothered to try using the fan pulley,the one on the balancer lines up fine so I've used that for the past 13 years..

I have used an old air pump pulley off a GM smog pump to drive the v-belt pump on one of my other plow trucks (71 GMC)--the original pulley rusted to hell and was eating & tossing belts..all I had to do was drill the 3 holes to bolt it to the balancer and make pipe spacers to space it away from the other pulleys enough to work..it was almost a duplicate of the fisher one..
 
I found that the Fisher pulley installed on the truck is a duplicate of another I had in a box. There is no number stamped on it but resembles the Fisher diagram. Mine is installed with four flat washers per stud between OEM pulley and Fisher pulley. Thus, longer studs are installed. In turn, the fan clutch is about .5" further into shroud and isn't piloted in any way with respect to the water pump shaft. There may have been a piloted spacer once upon a time but the Fisher diagram doesn't illustrate it. If that's not enough...I tried to mock up my resolution today and found that the Fisher pulley weldment has incredible circumferential run-out. I can't even get it over the snout of the OEM pulley and water pump shaft and studs!

I ended up stacking 1/4" of shimming washers between the OEM pulley and the Fisher pulley then lightly bolted them together. I rapped the Fisher pulley until it ran true, then locked the bolts. I then welded the Fisher pulley to the OEM, 4 stiches 1" long with TIG. I will now cut the Fisher adaptation plates off. It will run truer than Fisher could ever imagine and I can install my fan as OEM.
 
Yeah,I have seen quite a few Fisher pulleys that were not exactly "true"--some had a lot of runout,others wobbled up and down some,like the hole in the center wasn't centered perfectly..

On one of my plow trucks the pump was tired and was slow to lift the blade--I decided to make a pulley 2" larger to mount on the balancer and that speeded it up a lot!..almost too much,the blade lifted so fast..beat having to put the truck in neutral and rev it up every time to lift the blade up..before I did this mod my lawn got severely gouged up,when the blade failed to lift quickly enough...
 
Yeah,I have seen quite a few Fisher pulleys that were not exactly "true"--some had a lot of runout,others wobbled up and down some,like the hole in the center wasn't centered perfectly..

On one of my plow trucks the pump was tired and was slow to lift the blade--I decided to make a pulley 2" larger to mount on the balancer and that speeded it up a lot!..almost too much,the blade lifted so fast..beat having to put the truck in neutral and rev it up every time to lift the blade up..before I did this mod my lawn got severely gouged up,when the blade failed to lift quickly enough...
 
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