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Discussion Forum

N-O-R-M-A-L What is this in PSI?

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Trent Williams

02-16-2002 12:29:26

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My d14 book says oil pressure should be around o, r,m ?? I will be buying a new gauge. Should I buy a 0-30PSI, a 0-80PSI. I don't care if it's original or not.

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02-17-2002 14:20:35

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 Re: N-O-R-M-A-L What is this in PSI? in reply to Trent Williams, 02-16-2002 12:29:26  
Interesting that This was brought up. My father is cuurntly restoring a B. It has never been rebuilt and it only has 10 psi when warmed up. My uncle, who has more experience than us with motors, thinks that it should be more. Please give us some hints. We are thinking of rebuilding the motor for this reason.

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02-17-2002 15:19:00

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 Re: Re: N-O-R-M-A-L What is this in PSI? in reply to Trevor, 02-17-2002 14:20:35  
a B or C motor will put out 15 psi on a good day. Mine runs 12 psi when hot. What you want is volume, not pressure. The pump, pumps oil donw the middle of the hollow cam shaft. Oil is sprayed thru holes toward the connecting rod and crank bearings. A relief valve limits the overall pressure to about 15 psi. A minor amount of the volumn, about 15% is blead off the pump and goes thru the filter. This oil is cleaned and returned to the sump, not directed to the bearing like your truck motor.
---If your engine has 10 psi, thats plenty. Dont overhaul unless you have other problems.

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Muray Dunn

02-16-2002 16:19:41

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 Re: N-O-R-M-A-L What is this in PSI? in reply to Trent Williams, 02-16-2002 12:29:26  
O-30 is about right. Allis Chalmers carried less oil pressure than many others did. I have seen them hold up wel with as little as 10 psi.

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02-16-2002 16:55:20

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 Re: Re: N-O-R-M-A-L What is this in PSI? in reply to Muray Dunn, 02-16-2002 16:19:41  
As a kid I ran a B on the farm where I worked that had been rebuilt at least twice. Maybe the oil pump was worn or something and it was getting on towards another rebuild. Anyway the only time that engine had oil pressure was when it was cold. We ran that tractor hundreds of hours with no oil pressure showing on the gage. But it had flow to the bearings obviosly. I will admit this isn't the best but it just goes to show you don't need much. Also had a 49 ford turck with a flathead V8 that was the same story, only that one had a rod knock too.

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