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Tool Talk Discussion Forum

Help- milky oil in a Kellogg Compressor

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Phil Crome

02-20-2005 15:44:42

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Greetings all,

I recently purchased a Kellogg American (American Brake Shoe) model 331 air compressor for the pricely sum of $100. I brought it home, plumbed it in, and fired her up. It had been receiving only intermittent use for the last few years, so I was not surprised that the oil was not too beautiful. Changed it. Within an hour of run time, it was milky again. Changed again, milky again, twice more. What's more, there is pulsating pressure in the crankcase. This is a two stage compressor.

I'm assuming, probably incorrectly, that this is a ring issue. So, does anybody have any suggestions regarding parts availability, et cetera. I have not torn it down because I didn't want to spend a bunch of time on a boat anchor.

Suggestions and guidance would be very welcome.

Regards,

Phil Crome

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Roger P.

02-20-2005 18:14:17

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Re: Help- milky oil in a Kellogg Compressor in reply to Phil Crome, 02-20-2005 15:44:42

The pulsing of air is normal (within reason of course), as there is a crancase venting cycle going on, much like with a PCV valve in your car engine. If the pump was used intermittently, I would think that there is a good deal of sludge in the crankcase. I had a DeVilbiss 432 apart this week that had a 1/4" of rusty "gravy" in the bottom of the case from running little for the past 20-30 years or so. If so, you can expect the oil to go off rather quickly as it mixes in with it. I'd pull off one of the crankcase inspection covers (if it has them) and give the case a good flushing with Varsol, followed by a thorough wiping out with some cotton rags. A Varsol spray gun might be handy, to get in up under the pistons and such (of course, with the compressor down, where will you get the air for it...). Anyway, if you do all this, and you still get milky oil, I'd suspect that the operating environment is too cold, or it is operating in an area of high humidity, like in a car wash,near a pressure washer, swimming pool or other location with lots of moisture in the air.

A 331 is definately a wothwhile machine to keep and rebuild. An "old-school" machine, with lots of iron and overbuilt for durability. See the website below if you need parts. Alternately, any local compressor repair shop should be able to get you an ICC (Independent Components Corp.) rebuild kit

Kellogg Parts

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