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Tool Talk Discussion Forum

Compressor rebuild: Methods Discussion.

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tino

01-23-2006 22:01:59




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Howdy guys,

I have decided to go ahead and make an investment in my sears MD#: 919.152390 aka "oil-less POS". I plan to fix the problem I have been experiencing along with rebuilding. The problem has been outlined a few discussions down the board. I figure it should be a worth while investment, any one disagree?

I have never done compressor work but have build my 302 several times.

I would like any tips people with experience have: I have a few uncertainties....

Like should I lube up orings? Are the O-ring gaskets reuseable? Since I am buying practically every major part except the motor, I will invest in new orings and seals all around. This 5yr old compressor has see its days.

If I button her up, and for some reason need to open it up again. Will I have to get new orings?

.....
CA
I

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IA Roy

01-24-2006 10:21:51




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 Re: Compressor rebuild: Methods Discussion. in reply to tino, 01-23-2006 22:01:59  
I just rebuilt a Devilbiss oilless for my son who had it gifted to him. The cylinder cup and the piston ring and 2 o-ring seals were the extent of the kit. Ring was broken and cylinder was scuffed. Kit cost $25 plus about $10 S&H. About 15 minutes to take apart and 1/2 hour to put back together. Very simple.



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tino

01-24-2006 10:34:07




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 Re: Compressor rebuild: Methods Discussion. in reply to IA Roy, 01-24-2006 10:21:51  
I have a question about the compression ring. Mine is fitted around the piston and the cap is screwed down on it (easiest @~TDC). The ring kind of molds to the rod when the cap is torqued, since the comp. ring is kinda mallable. Is this the proper way to do this? Does this discription sound familiar??



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IA Roy

01-25-2006 12:34:56




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 Re: Compressor rebuild: Methods Discussion. in reply to tino, 01-24-2006 10:34:07  
Sorry it took so long to get back to you. I forgot to check the email notification box.
That sounds about right. I am not sure what the ring is made of. It isn't real hard, I think it is some type of plastic. I had the piston and rod off the compressor and wedged the piston and ring in the cylinder at an angle and assembled the cylinder, piston and rod onto the crank and into the cylinder mount bracket.

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larry in tn

01-24-2006 08:07:25




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 Re: Compressor rebuild: Methods Discussion. in reply to tino, 01-23-2006 22:01:59  
You didn't say if this is a single or two cylinder unit. Compressors are my hobby. I stay away from oiless pumps but still have a few of them. The best and cheapest source of parts is E-bay. Check the air compressor and other parts listings. Jaydog(Justin Hearn) and the Pump Place both have rebuild kits for the oiless units at about 1/4 the Sears price.

Don't use oil when you assemble the piston into the cylinder. The cylinders have a Teflon coating and the oil combined with dust/dirt will speed the wear of the coating material.

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Slowpoke

01-24-2006 01:46:27




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 Re: Compressor rebuild: Methods Discussion. in reply to tino, 01-23-2006 22:01:59  
Is the compressor used several hours daily, or a couple of hours a month? Most likely it has more life in it if it's the latter. Why are you going to all the trouble and expense of a complete rebuild? We know that all the parts are not available. Where will you get them? I don't remember you stating a problem except that you can't find the check valve...what is the problem with the machine? Find the bad part and replace it. 15 cu ft/min is a good supply. And O rings don't need lube. They are cheap. Buy an assortment from Harbor Freight, $10

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Chris(WA)

01-23-2006 22:06:35




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 Re: Compressor rebuild: Methods Discussion. in reply to tino, 01-23-2006 22:01:59  
Save your money and buy a new compressor.The oilless direct drive compressors just do not last. You said you got 5 years out of it new which is a bunch better than some I have seen. Rebuilt you will be lucky to get half that time out of it. Better to spend money on a belt drive unit and have it for many years.



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tino

01-23-2006 22:21:55




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 Re: Compressor rebuild: Methods Discussion. in reply to Chris(WA), 01-23-2006 22:06:35  
Hey Chris,
Thanks for the reply, to be honest this is the first problem I have had and am a bit ignorant to the repuatations compressor company's have. I was hoping some one would debate this issue with me, so thanks!

My reasoning: The specs on my compressor are:
"6hp", 33gallon, 240V, 15cfm@40 and 11.5cfm@90.

Any compressor comprable is an easy $325+. For a rebuild I will spend 150max, and that would replace everything except the motor. Granted the motor is about 250 or so, Hate to see it die!

De Vibiless produced this compressor and is offering a different intake with check valve that I am curious about. The psi switch is alos different.

I dont have alot of money, but want to make the best decision!

Thanks!

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