Is there any internal difference between a V belt vacuum pump and a serpentine belt vacuum pump? The V belt pump rotates clockwise as viewed from in front of the truck, where as the serpentine belt vacuum pump rotates counter-clockwise as viewed from in front of the truck. I'm thinking about changing over to V belts but I want to keep the vacuum pump on top.
Vacuum pump direction of rotation?
- Thread starter rjjp
- Start date
gatorman21218
Registered User
dont think it matters which way the vacuum pump turns. It sucks in either direction
Dsl_Dog_Treat
I lost my face to the jaws of a poodle
IIRC Mr. Back seat extra parts guy Gary confirmed that they'll function rotating either direction. 
Once I had the wrong size serp belt and I had to run it over the top of the vac pump. That made it rotate backwards, as the belt is supposed to run underneath the pump...
Hey, don't these pumps have a oil drain hole so we can change and maintain the proper oil level?
If so, you might want to change the oil when you convert to V belts...
Hey, don't these pumps have a oil drain hole so we can change and maintain the proper oil level?
If so, you might want to change the oil when you convert to V belts...
icanfixall
Official GMM hand model
The dog actcher is correct. These vacuum pumps suck runing either direction but.. I learned that from midnite rider. How he figured that out is something you need to ask him. And yes, they have a location to add or change the oil thats in them. That too was learned from the rider. Me thinks he has more time to "discover" things like this than I do...
Jake_IN
Full Access Member
Yeah they will work in either direction. All the pulley spins is a little lobe (looks just like a cam lobe) that pushes on a little button that goes into the big pancake thing.
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