Vacuum pump belt tension

[rreegg]

Anyone have a general rule for how tight the vacuum pump belt should be? It was was a bit loose so tightened it up a bit but worried it's too tight - I can push it in about 1/4"-3/8" which seems about right but it seems pretty tight.

I have a ford manual but it states like ft/lbs or something and not sure how to measure that.

Thanks yall

 

[tradergem]

You need a v belt tension gauge. You can order them online or pick them up from your local parts store.

 

[rreegg]

Thanks trader didn't know about those

 

[Jesus Freak]

It's easy, push down on it with the left hand, tighten 10mm bolts with right hand, it works every time. You got this....

 

[ROCK HARVEY]

Here’s the page on v belt tension from the service manual I have:

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[rreegg]

Here’s the page on v belt tension from the service manual I have:

You must be registered for see images attach

Is the air compressor the vacuum pump? Thanks this is helpful, i've used tension gauges before for marine rigging and they definitely work. I've seen tension by deflection numbers provided in a lot of engine shop manuals though so this is exactly what i was looking for.

 

[ROCK HARVEY]

The service manual I have is from International not Ford, so I guess it makes sense that they list an air compressor for air brakes rather than a vacuum pump for vacuum-assist brakes. I didn’t notice that, and I can’t say for sure that the belt deflection would be the same on the vacuum pump. Does anyone have the spec from Ford?

 

[tradergem]

The vacuum pump is located below the alternator.

 

[The_Josh_Bear]

The service manual I have is from International not Ford, so I guess it makes sense that they list an air compressor for air brakes rather than a vacuum pump for vacuum-assist brakes. I didn’t notice that, and I can’t say for sure that the belt deflection would be the same on the vacuum pump. Does anyone have the spec from Ford?

It lists the same spec(1/2"-3/4") for all 4 belts, so don't worry too much about it. Though I personally would not have as much as 1/2" belt deflection on such a short belt, though for the vac pump maybe it doesn't matter.

Thanks for sharing!