Is synthetic compressor oil the problem?

Hi,


I have an older model Campbell Hausfeld Model vt61230 I bought new back in the late 80's.

A couple of weeks ago I changed the compressor oil and switched to synthetic oil instead of non-detergent. Everything was working fine and then and then a couple of days later the air compressor wouldn't turn on.

I took the motor to the repair shop and they reset it. Upon re-installation the motor worked, but the belt squealed as though it was meeting with resistance, but it did turn the belt.

Now, when trying to pressure up, air comes out of the vent tube located at the back of the cylinder, and continues until it bleeds completely down.

Looking at the other posts, it seems that I might have an issue with valve or piston not seating.

My questions would be could the synthetic oil cause this and the approximate cost of repairs and if it would be worthwhile.

Thanks,

Alan

Comments for Is synthetic compressor oil the problem?

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Aug 08, 2015
Tiny air leak
by: Alan

Hi Bill, et al.

Again, thank everyone for your valued input!!!!!

I have a tiny air leak between the base of the check valve and where it seats to the tank. There is a thin copper washer between the tank and the check valve.

I tried Teflon tape, it helped, but the leak is still there, about 5-7 psi drop per hour from 120 psi shut off pressure.

Other than that, it's back in business and runs like new!!!!

Thanks,

Alan

Aug 07, 2015
oil spill ?
by: Doug in s.d.ca

OK. Found the pump.

Bill can move pix to here if you start a new thread with the same title.

You probably do have some blow-by, pressurising the crankcase, but I'm pretty sure you have too much oil in there, too. C-H says synthetics such as Mobil One are OK to use.

If you let the thing run on its own, what happens? Does it run and stop gaining pressure, or what? And does it sound normal?

Aug 07, 2015
Resolved!!!!!
by: Alan

The check valve had a tiny screw wedged in the housing preventing the plunger from completely closing!!!!!

Thanks for you valued input!!!!!!


Alan

Aug 07, 2015
Air out of vent tube
by: Bill

If air is coming out of the oil fill vent tube while the compressor is running, that is symptomatic of failed piston seals.

If compressed air is coming from the oil fill vent tube when the compressor is stopped, and that air continues for more than a few seconds, then that points directly to the air in the tank. The thing that is supposed to keep the air in the tank is the check valve. If air is coming out of the tank when the compressor is stopped, it's pretty much got to be a failed tank check valve.

If you wish to add photos to this thread, start a new thread in the compressor oil forum, in the text say the photos are to be placed here: Is synthetic compressor oil the problem? , you can then upload up to four pictures and I'll move them here.

Bill

Aug 07, 2015
campbell hausfeld vt612301
by: Alan

I'm not sure how to attach photos to this thread. I removed and cleaned the check valve and air continues to come out of the vent tube (crankcase). I ran the compressor to about 10 psi, then removed the oil fill plug and oil came out of the plug receptacle. It seems like I have a ring or something that is not seating. I can email the compressor photos if that is permissible. It is a dual piston setup.

Thanks,

Alan

Aug 06, 2015
Pix and info, please
by: Doug in s.d.ca

Given the symptom, I doubt the oil change has anything to do with the problem.

This is a twin cylinder pump? (Not finding that exact model)

Anyway, sounds like a valve - as in check valve.

Please post pix if this is not the problem. You can disconnect the tank or open the drain valve - will it run then?


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