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Allis Chalmers Discussion Forum

oil pressure

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03-28-2004 14:03:53

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last week i had a question about oil pressure and flow. I had no oil pressure registering until i cleaned the filter with gas. then got plenty of pressure ("R" on the "NORMAL" scale. I put in a new filter-same 51101 string wound and put in 6 qts of 30 weight non detergent oil. now I have flow coming from the center tube in the filter but am not developing any backpressure. Needle on the guage doesn't move. Is it safe to run like this?

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Ronnie in Tx.

03-28-2004 21:39:57

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 Re: oil pressure in reply to pat, 03-28-2004 14:03:53  

Filter & oil pressure Fram oil C159

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03-29-2004 07:33:50

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 Re: Re: oil pressure in reply to Ronnie in Tx., 03-28-2004 21:39:57  
wow. thanks guys. I was told before about the paper filters on this site and I insisted that the new one was not paper. he assured me it would work. looking at Ronnie's research it is obvious that is my problem and that the filter is indeed paper. I am going to clean the old filter good and use it. Thanks a ton.


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03-28-2004 16:53:48

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 Re: oil pressure in reply to pat, 03-28-2004 14:03:53  
Especially with cold new oil you should see some pressure. It would seem something is wrong. How long did you run it? It may take a minute or two to fll the filter. At this point I might try taking the filter off and someway plugging the hole in the tube so you would eliminate the filter and it's bypassing oil all together, as a test. Is your bypass valve working, not sticking open, or broken spring? As a test try putting a couple of washers behind the spring to see if it gets you any more pressure.

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