About how good/bad/mediocre is .07 torr / 70 microns on these pumps blanked off with the sensor at the pump hooked up with a kf25 → kf16 adapter? I replaced the HP vanes and went from 1.5 torr to .07 torr. This was my first fill up after a rebuilt and I only let it run about 15 minutes. The ballast wiring was connected. Should I let it run longer blanked off after the rebuild?
Any pointers you could give, would be appreciated!
its real bad. I think 12 micron is pretty much outta spec on these. Are you sure your gauge is correct. You are using an open source one right?? maybe one of the orings is wrong or something. I dont know shit about pumps except when they are outta spec and your certainly is.
No bueno, doeant fit. The threads are too large on the filter.
I looked thru the link of 2021i parts, I didnt see the filter listed. May just call them.
Thanks for the response. That helps.
Yes, I am using the open source one. It is probably not giving me accurate results. I’ll have to look more into it this weekend. I’ll go over everything once more.
Have a good weekend.
You have to let it warm up all the way to get the full pull, 30+ minutes, or when the case is quite warm to the touch. Run it for an hour before/when you flush it.
Flush it a minimum of every +/- 8 hours of use with SPD or Roto with volatile solvents.
Thanks.
I have my SPD on order, this information will for sure help me in the future. I really appreciate it.
When I get home from work I’ll fire up the pump and let it run for a few hours then hot swap the oil and see where I stand.
I believe I’m having a sensor issue over all. The inside of the pump looked perfect aside from the vanes I replaced.
If you are just running and flushing while capped off then keep doing it until the oil comes out mostly clean then you will get max microns when you finally do hook it up to your beautiful new equipment.
Who did you buy your SPD from, if I may ask?
well I just tore it apart and cleaned everything out with kerosene. if anything, it has a slight residual bit of kerosene on the surfaces, but outside of that, it should be totally spotless on the inside. I tore the whole thing apart.
I will properly heat it up today and check where I’m at. I try to do my due diligence before I post, but sometimes, like the microns of my pump and how its performing is a bit harder to search for 
Before I say this, understand, I’m just a regular ol guy. I have a small closed loop that I run for myself as I dont really trust any of the stuff thats out there. I ordered a small 500ml shortpath from usalabs to get my started as I really dont trust any of the distillate I’ve been buying.
My gauge was indeed off. Reset it to factory defaults and got 763 torr atmosphere.
After pumping down it looks like the best I can get is 30 micron. I’m going to let it run for an hour and then swap the fluid and see if I can get more. If not. I’m not quite sure what’s wore out. Guess I’ll order the shaft seals next.
Thanks to the thread, I am at 18-19 torr after one hour.
Will try it connected to glass next & see what reading I can pull…
I was able to get mine down to 2.91 microns after replacing the HP vanes and flushing it a couple times with flushing fluid. Are you measuring it blanked off at the pump? @puccinia
Also. Not sure if there is a math problem or if you meant micron instead of torr. But 18 torr isnt too good. 1.5 torr is ~1500 microns for example.
Sorry typo. Yes 18 micron blanked off at the pump. My vanes and seals look in good shape generally, but considering how corroded the sight glass is, I am sure some seals have also seen better days
Never used flushing fluid but many flushes with kerosene mix, prior to last rebuild. Probably need another flush since I rebuilt. Also I’m using standard grade 19
Finally got my pump from eBay today after the 1st oil change its only drawing down to around 240 micron. Going to Perform the kerosene runs tomorrow in hopes to get it lower. When I turn the pump off, my gauge goes from 240 to lome 8000 almost immediately. Is that a sign of a leak inside ?
Has anyone found an actual glass sight glass for the 2021i? My pump pulls to 0 microns(that’s all my gauge reads) but I can’t see through the sight glass to save my life. Would love a clear visual on oil.
Try vacuum pump supply (VPS).
Be careful doing too many kerosene flushes, it fucks the vanes up. Get flushing fluid instead.
Just purchased a gallon of the flushing fluid. Do you recommend doing a run of the kerosene and oil 1st and then flushing it or just using a flushing fluid? When I 1st turned on the pump with my vacuum meter, was below sub 100 micron. After an hour and an oil change I was at like 300.
I’ve used both successfully. I find that running the gas ballast for up to, and over, 24 hours leads me to not have to use flushing fluid anymore. But if the pump is new, try 1 kerosene flush for 20 min, then oil change. Run 30 min. Oil change again. Run ballast for a couple of hours. Then when testing vac let it run for 10-20 minutes to see your ultimate vac. If it isn’t up to par do a 20 min flush with flushing fluid, oil change and run the ballast again. Possibly a second oil change again.
Edit: don’t forget to turn off the ballast when testing ultimate vac.