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Re: Re: Re: Air compressor oil
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Posted by Roger Prosper on July 23, 1999 at 11:41:01 from (139.142.252.147):
In Reply to: Re: Re: Air compressor oil posted by jim on March 13, 1999 at 00:21:23:
Avoid all types of multigrade motor oils. Shell Corena is the best type of oil I have ever seen for reciprocating compressor use. When the rings get weak on an air compressor, or when natural oil blow by from the crankcase reaches the valves, it can burn if it gets too hot up there. Corena will lightly ash under such conditions, but multigrade oils of any type will turn to something resembling charcoal. This will lead to valves sticking open, poor air flow and severe and rapid overheating, causing a snowball effect leading to other mechanical woes. I've taken apart Quincy 325 air compressors used on oil drilling platforms where they threw in the 15w40 they used for their Detroit v12's. I had to hammer them out because there was so much glass like carbon build up in the heads! The only problem with Corena is its availability in small amounts (5 gal buckets was the norm where I worked). Perhaps a compressor shop in the area has some you could buy by the gallon? It comes from 32 to 122 grades. Lighter for cold, heavier for hot. Interestingly, DeVilbiss only recommended 30W even in their heaviest duty 445 and 447 compressors, under the hottest conditions. Lighter oil gets up to the wristpins sooner upon startup than a heavier oil . Wristpins were a sore point on these machines.
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