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Tool Talk Discussion Forum

Cleaning/changing the oil in my compressor

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Lee

09-09-2003 09:48:02

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Recently bought an older Craftsman two cyl compressor -- and I'm very happy with it!

However, I drained the oil and found that much of it was more sludge than oil, almost as thick as tar and very lumpy.

I drained as much of this out as I could, but know that a lot still has to be in there. Any suggestions on how to clean out this crud, hopefully without tearing the compressor apart?

Anything I can safely dump in there that will thin the crud enough to run out, or other solutions?

Any and all suggestions much appreciated!

Lee

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Joie

09-09-2003 21:05:05

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Re: Cleaning/changing the oil in my compressor in reply to Lee, 09-09-2003 09:48:02

We bought a new compressor for our body shop in 1969.We have never used anything but automotive oil, penzoil & valvoline 30w. I have changed the washers around the valves w2 times. I have never had a problem with sludge build up or ring wear. Mind you this is a compressor that serviced 3 to 5 bodymen since 1969 & is still in service.

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Vern-MI

09-09-2003 16:29:09

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Re: Cleaning/changing the oil in my compressor in reply to Lee, 09-09-2003 09:48:02

I have a 35 year old Craftsman compressor also. I cleaned the compressor crankcase by removing the belt guard, the belt, the large pulley and the end cap on the compressor. I put a drain pipe in the 1/8" pipe drain hole and tilted the whole unit to the drain side. Then I sprayed choke cleaner into the sump directly at the deposits and allowed the trash to drain out of the 1/8" drain pipe into a pan. I did this untill it was clean inside. I did not spray directly onto the connecting rods and crank. Once clean I liberally squirted Campbell Hausfield compressor oil onto the crank journals, mains, cyinder walls. I then refitted the end cap on the compressor and filled it with the compressor oil and reattached the pulley, belt, guard and it was ready to go.

Make sure the pulley shaft is clean and the keyway edges are smooth before removing the cover to prevent oil seal and bearing damage.

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Mac

09-09-2003 16:28:04

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Re: Cleaning/changing the oil in my compressor in reply to Lee, 09-09-2003 09:48:02

My old sears compressor say's use compressor oil OR 20wt motor oil. 20/20 is hard to find. Sears sells compressor oil as do TSC. About 5 bucks for a little less than a qt is what I pay. I dont work this machine to death, but change oil once a year anyhow.

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Don c

09-09-2003 10:26:17

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Re: Cleaning/changing the oil in my compressor in reply to Lee, 09-09-2003 09:48:02

Have changed mine several times and if not in a big hurry I put kerosene in it,fill to proper level let it set, then shake it some, then drain, DO NOT RUN IT WITH KERO. tilt it to make sure all kero. is out, then refill to proper level with oil and run, should clean it up nice after a couple of times of doing this. Be sure to use air comp. oil in it or seals may start leaking.

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Lee

09-09-2003 11:45:01

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Re: Re: Cleaning/changing the oil in my compressor in reply to Don c, 09-09-2003 10:26:17

I've been using automotive 10w30. I use air-tool oil in my tools, but I didn't know there was such a thing as compressor oil!

Do I need to get this out of the case and refill?

Lee

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RogerP.

09-09-2003 13:31:58

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Re: Re: Re: Cleaning/changing the oil in my compre in reply to Lee, 09-09-2003 11:45:01

Car oil will carbon-foul valves on a compressor if used hard. While I would suggest using compressor oil over car oil, if the compressor is not used hard, has good rings and has its oil changed regularly, I wouldn't worry too much. It really becomes a problem when it is used in an industrial setting where the machines are used hard. There will be so much carbon on the valves that they will eventually cease to function. It will also turn into a gummy, sludgy mess inside the crankcase.

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Rod (NH)

09-09-2003 11:59:44

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Re: Re: Re: Cleaning/changing the oil in my compre in reply to Lee, 09-09-2003 11:45:01

Hi Lee,

I have an old Craftsman single stage two cyl compressor from about 1975. The original manual calls for 10W-40 detergent oil. Although I don't use that compressor any more, I did for many years. The 10W-40 was all I ever used in it. If you have the manual that went with it, check it out. If not, I am quite sure the 10W-30 would also be satisfactory. Change the oil frequently until things clear up in the crankcase.

Rod

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