air compressor issue

[Andyjman]

Hey guys, names Andy
Im a long time lurker, and i finally decided to join so i may ad to the wealth of knowledge that is here on this site.

I have a question for all the air compressor experts on here.
The other day i picked up a husky 80 gallon 3 cylinder 220v single stage air compressor used from a friend of mine. Its got a 5 horse motor, and its rated at 16.1 cfm at 40 psi, and 14 at 90 psi. Max tank pressure is stated as 155. I went ahead and installed the compressor in the garage, added a sub panel fed from my main house panel, and i added a service disconnect also. The date on the unit states that it was made in 2014 so its fairly new

My question is, how much blow by should i expect out of the vent? The oil is kinda dirty, so im going to change it, but my issue is that when i run it, oil vapor sprays out of vent on the back of the pump and coats the compressor, and anything down wind of the cooling fan with small oil droplets, and the ones that blow straight up onto the discharge header burn off and smoke.

When we were unloading the compressor, it was tilted on its side for about 2 minutes, but i let it sit for 2 days before i starred it. The current oil level is right on the red dot in the sight glass, but it looks quite dirty so i plan on changing it. I also checked the air filters and they are in good shape.

I have experience repairing and rebuilding compressors, but the ones i have worked on were large multi stage 200 gallon plus units, and i dont know how i should expect this one to behave.

I have also heard that some compressors can kick some oil vapor out due to the higher rpms of their motors, and that sometimes adding an extended vent tube is necessary to prevent the vapor from being carried out the crank case vent.

Sorry to ramble. Anyone have any ideas? I didnt get the manual when i bought the compressor and i am also unable to find out what type of oil to use with it, but from what i have been reading, it sounds like non detergent 30 weight is the way to go.

Id really appreciate any info.
Thanks,
Andy.

 

[Heavymetalmechanic]

Crank case blow by is caused by gases passing the piston rings when the cylinder is pressurized.

Changing the oil is a good start, increasing the vent tube length will help keep the mess down.

Does the problem get worse when the tank is almost at full pressure.

Can you get a model number off the pump?

 

[Heavymetalmechanic]

You can plug the outlet side and do a compression leak down test on each cylinder to see if one is bad or if all are worn.

 

[Heavymetalmechanic]

And Welcome to GJ, by the way!

 

[Andyjman]

Thanks for the welcome and the info, i can find the link to the pump model, and ill post it here. The problem is pretty much the same whether the tank is completely empty or if its at 145 psi. If it was bad rings, i would think that itdd get noticibly worse the higher the tank pressure due to the increased load on the pump.

 

[Andyjman]

Its a dayleap pump used by coleman, powermate, sanborn, husky, etc. The replacement part number from master tool repair is 040-0348

It looks like this
https://www.mastertoolrepair.com/images/0400348_Dayleap.png

the overhaul kit is only 126.00 so if push comes to shove i might just rebuild it, if i can find a sheet of the torque specs and a cylinder hone that small, maybe one for a honda civic 1.6 engine would fit hahaha.

 

[redmondjp]

It sounds like you should pull the head and take a look at the valves and cylinders. If oil level isn't too high, you shouldn't be seeing any blowby out the crankcase vent. My money is on the rings (for whatever reason - who knows, with the inconsistent overseas QC, you could have bad rings right from the factory that don't have the proper tension).

Have you checked the tank drain to see if there is any oil in the tank?

 

[Andyjman]

Yea, very minimum oil at bottom of tank.

 

[Andyjman]

Did an oil change and drained the tank completely. Ran it up to 100 psi, it took almost exactly 5 minutes to fill the 80 gallon tank to 100 psi from 0, so i did some math, and i such at math, and from what i calculated, it appears that its only putting out 9 cfm. Please correct me if im wrong.

Thanks,
Andy

 

[scw1991]

my IR2475 5HP 2-stg compressor fills an 80 gallon tank to 175 psi in 6 minutes. Mind you, this is a true 5HP motor pulling close to 22 amps at full load.

What's the nameplate amperage rating on your motor or model number for your Husky unit?

 

[Andyjman]

Its a husky c801h, name plate states 5 hp 22 amps, century electric motor. Dang, if yours fills that fast, mine must be hurting. Thinking it may be time for one of those harbor freight 2 cylinder pumps.

I also extended and raised the vent tube last night so ill see how it does today.

Also, Whats the cfm rating of your compressor?

Heres the link to mine

http://m.homedepot.com/p/Husky-80-g...tage-Electric-Air-Compressor-C801H/203187346/