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Discussion Forum

Proper oil pressure for a WD45

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Pete S

01-06-2003 20:03:27

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As I've been working on my WD, I picked up an oil pressure gauge at Fleet Farm. It appears to be a pretty decent gauge. The old gauge was shot and could not be read. The new gauge appears to work fine. I am a little concerned as to what it reads for oil pressure. What should I be seeing for running pressure. (mine wasn't very high)

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Peter Scheuerman

01-07-2003 14:42:39

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 Re: Proper oil pressure for a WD45 in reply to Pete S, 01-06-2003 20:03:27  
Thanks for the responses. The 12 psi should be about right for what I see on the gauge. It did state on the pkg that it was for an Allis WC/something (?) but it is actually set up 0-80 psi, I think, (it's out in the shed). It was a VERY nice gauge, appears to be for exposure to the elements, $9.00 +/-, was intended to dash mount but that's why God made bolt cutters!
Thanks Again!

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Dave Grubb

01-07-2003 07:27:59

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 Re: Proper oil pressure for a WD45 in reply to Pete S, 01-06-2003 20:03:27  
I believe my manual says the gage should indicate on the 'O', 'R', or 'M' when running. I took my gage off and tested it in a lab using a hydraulic dead weight gage tester. The 'O' = 6 psi. the 'R' = 9 psi, and the 'M' = 12 psi. I did not check the other letter positions for some stupid reason.
The best standard practice on selecting a gage is to use one that indicates normal system pressure within the middle 50% of the gage span.

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01-07-2003 04:14:47

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 Re: Proper oil pressure for a WD45 in reply to Pete S, 01-06-2003 20:03:27  
I have a suggestion..check to see how much oil flow is going thru the oil filter... It is not in the pressure-feed system, and if it is getting too much oil flow...it could cause the pressure to be lower... A restrictor in the filter line is good, if too much oil is going thru the filter...I'm not positive, wheather that oil returns to the oil pan, or goes to the rocker arms...

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01-08-2003 17:47:07

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 Re: Re: Proper oil pressure for a WD45 in reply to Ron, 01-07-2003 04:14:47  
Oil from the filter goes into the valve lifter space on the side of the block, from there it can run back into the crankcase.The oil line that "Ts" off this one goes to the head for the rocker arms, on 45s there is another T in the system that takes oil to the governor. If you end up restricting oil to the filter, make sure it is only to the filter your are restricting it.

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Tom, again

01-08-2003 17:57:06

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 Re: Re: Re: Proper oil pressure for a WD45 in reply to Tom, 01-08-2003 17:47:07  
I should have mentioned that worn cam bearings can be a major cause of low oil perssure. Oil flow to the main bearings comes from the camshaft and camshaft bearings so if they are worn too much they bleed off too much oil. You can try to increase oil pressure a bit by puting a shim under the oil pressure relief valve spring. It is the large hex plug on the side of the block where the dipstick and oil lines are. You don't want too much oil pressure either, as has been said 12 psi is great. These are not high reving engines, and they aren't stressed too much for the HP they produce related to the size of the engine. If you try shimming just add a washer at a time, and I would say you don't want to add more than a few as a guess. If adding a few doesn't make a diffeence you man have other causes. I have seen a B engine run for years with no oil pressure when the oil was warm, flow yes, but not enough pressure toregister on the gage. And this engine was worked HARD and long in the hot summer. I would like to at least see the needle move but a lot of pressure isn't necessary in these engines. When I was in the nave an old timer said that 10 LBS per 1000 rpm was enough as a general guide. I think he had something.

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Tim (Ok)

01-06-2003 21:21:57

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 Re: Proper oil pressure for a WD45 in reply to Pete S, 01-06-2003 20:03:27  
Manual says 12 psi Allis oil preasure guages are 30 psi guages. if ya have a 60 or greater itll read low. Hope this helps Tim

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