Vacuum Pump Rebuild

[sweetwoodmaple]

I am rebuilding a Dalaval 75 that is from 1957. It has quite a bit of wear on the side plates (.020 "donut" groove from the rotor) and it needs new vanes, bearings, and seals.

Has anyone rebuilt these pumps before? I need to know roughly what running tolerances are needed between the rotor and side places. I don't think I can trust what is there now as there has been so much wear.

I am guessing right now there is about .020 difference between the rotor width and the bore width. Is this too much (will oil blow by)?

Any help is appreciated.

[gmcooper]

Not sure if they still make rebuilds for model 75. Check with www.partsdeptonline.com they have a lot of pump parts and rebuilt pumps.
Mark

[sweetwoodmaple]

The parts are mostly the same as the model 76, I just have to trim the vanes.

I'm able to do the rebuild myself, that's not a problem. Just need some pointers on the tolerances.