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Discussion Forum

Oil Pressure (or lack of it...)

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Ron from IL

08-23-2002 11:02:19

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I have an Allis 'C' that now has no oil pressure showing on the gauge. I raplaced the gauge, still no pressure. I've checked th I&T manual, but cannot find where the pressure relief adjustment is (I may have just missed it...). I still seem to have oil circulating--pulled the valve cover and it's oily. Where's the adjustment?



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08-23-2002 15:21:07

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 Re: Oil Pressure (or lack of it...) in reply to Ron from IL, 08-23-2002 11:02:19  
My C had a sudden loss of pressure,while using it.The pressure loss showed up after shut down for lunch,but may have happened while running. When we pulled the pan,the pickup had small small bits of grass in it,so we spilt the tractor and pulled the pump. The springs behind the vanes had grass bits jammed in them and couldn't move the vanes.Cleaned everything and back together again,oil pressure is back to 12 psi.

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Duey (IA)

08-23-2002 12:32:10

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 Re: Oil Pressure (or lack of it...) in reply to Ron from IL, 08-23-2002 11:02:19  
The oil system is a "bypass" system and pressure is built up going through the filter. If the center distribution pipe that takes the oil to the top of the filter is gone, (sometimes removed with the old filter) the oil flows back to the oil pan without building pressure. The oil pressure gauge only measures this bypass pressure. Duey

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Ron from IL

08-23-2002 13:17:28

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 Re: Re: Oil Pressure (or lack of it...) in reply to Duey (IA), 08-23-2002 12:32:10  

Thanks! I'll check it out. Since the 'C' has a spin-on filter, does the pipe screw on to the filter mounting base? I don't recall seeing a pipe there, but since it's time for an oil change anyway, I'll look closer.


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08-23-2002 16:03:16

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 Re: Re: Re: Oil Pressure (or lack of it...) in reply to Ron from IL, 08-23-2002 13:17:28  
Ron, the oilpump pushes oil down a hollow cam shaft and sprays on the pistons and bearings from the under side. as Duey said, a small portion of the oil is bypassed and put thru the filter and then dumped back to sump. they are not runing the oil thru the filter then to the bearings like an automotive engine. the gauge measures the pressure in the line to the filter housing. when you screw off the filter there is a 1/4 inch tube about 4 inches long (just a guess) if it is pushed down too far it will cut off flow to the guage. if it is remove it will let all the loil eak thru the filter and not measure any pressure on the gauge. you can hae o.k. oil and still read nothing. when running, loosen the small line to the "head" or the governor pivot arm. see if you get a oil flow here. you can also look inside the vavle cover as you said. the line to the "head" drips on the rocker arms and valves as it goes thru the hollow rocker arm shaft.

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Duey (IA)

08-23-2002 18:49:40

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 Re: Re: Re: Re: Oil Pressure (or lack of it...) in reply to steve, 08-23-2002 16:03:16  
You got it right Steve, thanks. The Mrs. took me out for supper (cause I'm such a nice guy)so I didn't get a chance to answer. Duey

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