Benjamin Pump Repair -> Problem !!

[SpiralGroove]

Hey Guys,
I hate to cry Uncle, but I need help!

Trying to get that last brass nut unscrewed , so that I can get at the #007 o-ring.
Anyway, put the the steel (polished) inner tube in a padded vise and finally getting the aproximately 25mm brass nut to turn.  However, it's not unscrewing like it should, just turning .  The steel tube in vise Not turning either.  None of the videos I have seen show this.  When you turn a threaded nut, it unscrews - Right?  We'll, not this one.  Also, the other end of the tube w/check valve turning with 25mm brass nut? 
Now, I don't want to scratch anything as it's highly polished, but getting perturbed

Help ...................................  Kirk

[robertr]

 You need to put a crescent wrench on both ends to break the threads loose, the end with the check valve is threaded into the inner tube, the brass end is held in with an o-ring. That is why it just spins.
Have you seen this video?

[SpiralGroove]

OK, Got inner steel tube out, but it's still attached to the 25mm brass nut.  Can't get at the #007 o-ring.
Put the smaller steel tube in the lathe chuck, clamped down very tight, still can't break loose the nut - must be corroded on.  Now stripping steel tube with chuck jaws .......... WAPOS.

What kind of penetrating oil/solvent will work on a brass/steel connection?

Kirk

[Roadworthy]

If you can get a socket on it you could try an impact wrench.  They will frequently break things loose where force won't.

[robertr]

 Have a picture? Not sure which step you are on.

[SpiralGroove]

Hey Guys,
As you can see, the steel inner tube came out of the end w/check valve.  So still trying to get that brass bottom nut off so that I can get to the #007 o-ring.  Need to break loose using some kind of solvent.





As Laurel would say "Another fine mess - Kirk" 

[Night_Raider_]

And WD-40 won't work?

[SpiralGroove]

Got it
Because I can be pretty dense at times, I didn't realize that it just slides out the other end.
What a Bone Head

[robertr]

 Good job, happens to us all

[Night_Raider_]

As is the custom around my household for this type of situation, I am obligated to give you a "good job" . Don't worry, I've long since given up counting the number of times I've recieved such a compliment

Ah, Robert beat me to it

[robertr]

 Looks like I gave you instructions for the wrong pump.

[SpiralGroove]

Thanks Guys
I sprayed the brass nut/steel tube connection with WD-40, will let it sit overnight.  Hopefully, I can break it loose & clean in the morning.  Want to clean all innards real good, then never let it go this long between rebuilds.
I noticed rust/corrosion on the top of the larger inner tube too, so need to give it a good > scrubbing & lube.

Was able to fix my pump gauge , the needle just popped off.

[Case Stuffer]

U Tube video  which seems very good to  me.

                         

[SpiralGroove]

Final solution: Heat the brass end with a blow torch for about a minute.  Because of the differences in thermal expansion between steel and brass, it came loose ...... slowly (it squeaked).  The steel thread was rusted pretty good.
Melted a few o-rings in the process, but that's OK.

Kirk