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Allis Chalmers Discussion Forum

oil pressure

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Bobby 9891

11-18-2012 19:10:14

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Just bought a 49 "C" & was wondering what is normal oil pressure ?? The gauge shows about 3-4 pounds of pressure @ working rpm"s & nothing @ idling. Runs good & seems to have power but was concerned- should I be ?? Thanks Bobby

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Dave DelDebbio

11-20-2012 14:43:14

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 Re: oil pressure in reply to Bobby 9891, 11-18-2012 19:10:14  
I had to clean out the tube from the filter to gauge. when I got one of my tractors, seamed the previous owner didnt like changing oil and the tube had gunk in it..

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11-19-2012 07:46:03

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 Re: oil pressure in reply to Bobby 9891, 11-18-2012 19:10:14  
2 common reasons for that problem are incorrect oil filter I use WIX57011 filters or the filter tube that goes up into the filter being missing due to the fact it stayed on the filter when a person changed oil

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Bobby 9891

11-20-2012 06:52:05

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 Re: oil pressure in reply to old, 11-19-2012 07:46:03  
I changed the oil filter-because it was painted over but it had the fram C159 on it & the tube was there. The gauge looks new.

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11-20-2012 07:23:25

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 Re: oil pressure in reply to Bobby 9891, 11-20-2012 06:52:05  
My have a bad new gauge or the wrong gauge. The A/C oil systems are low pressure systems so having a gauge to reads say 0-30 is incorrect and will give false readings so you need the correct A/C type gauge. Even when brand new the engine is lucky to have mush if any more then 15PSI

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Aaron SEIA

11-19-2012 04:52:15

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 Re: oil pressure in reply to Bobby 9891, 11-18-2012 19:10:14  
Might want to make sure it has the correct oil filter. For a while some of the new replacements were using a pleated paper media that led to low oil pressure. Media in the filter should be spun cotton, I know the Fram C159 is correct. Not sure on others. My personal opinion is 3-4 working and 0 at idle is too low.


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Dick L

11-19-2012 03:24:16

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 Re: oil pressure in reply to Bobby 9891, 11-18-2012 19:10:14  
Low oil pressure on these engines has nothing to do with the amount of oil at the bearings. The oiling of the bearings comes from a rotating camshaft forcing the oil out to the bearings.

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Justin SE IOWA

11-18-2012 19:40:49

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 Re: oil pressure in reply to Bobby 9891, 11-18-2012 19:10:14  
Nope dont be worried. All those ole AC's have low oil pressure

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