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Tractor Talk Discussion Forum

Oil Pressure Gauge Glitch !!!!

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Alberta Mike

08-16-2005 17:25:48




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Got a little concern here so here's the story. I have an early 60's MF swather engine (flathead Continental 4 cylinder) that I dropped into my 1941 Case V (with the same engine but 20 years older and a bit smaller, 124 vs 140 cubic inches). The newer engine bolts right into the Case V no problem. I hooked up my Case oil pressure gauge today and it is a low-range gauge which only goes to 30 pounds. That was OK before BUT the new engine pins the needle on the 30 pound mark. Obviously the newer engine is putting out more than 30 pounds of pressure. Easy solution is to put in a higher range gauge but mine is a Case gauge and I don't want to give it up. Question is, will the extra pressure mess up the gauge or will it be OK? I don't mind it showing 30 pounds all the time as long as the gauge can take it. I don't want one of the "new" gauges, they just don't look right. By the way, this gauge is accurate, I tested it on the last engine it was mounted on and it ran at about 18 pounds of oil pressure.

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8e3k0

08-17-2005 10:54:20




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 Re: Oil Pressure Gauge Glitch !!!! in reply to Alberta Mike, 08-16-2005 17:25:48  
Mike those old gauges have a curved bourdon tube to accurately measure a specfic band of 0 - 30, 0 - 40, 0 - 50 psi. so if you are above range this will likely straighten the bourdon tube thus giving an inaccurate reading over time. Normal gauge readings at operating temperature should be 50% of maximum gauge reading. Example if it is a 0 to 100 psi. gauge then operating pressure should be in the 50 to 55 psi. This allows for higher pressure bumps when cold etc.

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Alberta Mike

08-17-2005 20:36:11




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 Re: Oil Pressure Gauge Glitch !!!! in reply to 8e3k0, 08-17-2005 10:54:20  
I thought that maybe it was a "bourbon" tube, then I'd understand. Those other kinds are too confusing.



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Larry from MD

08-17-2005 09:32:50




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 Re: Oil Pressure Gauge Glitch !!!! in reply to Alberta Mike, 08-16-2005 17:25:48  
Those engines had partial flow oil systems.So oil can go to the engine or to the filter. So check to see that oil is actually flowing through the filter,is has a large afect on preasure.



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doogdoog

08-16-2005 20:39:19




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 Re: Oil Pressure Gauge Glitch !!!! in reply to Alberta Mike, 08-16-2005 17:25:48  
Aloha, First, I would measure the pressure at idle and at full throttle to see what it is,like the other poster said. I would also try to find out what the pressure for that type of engine should be. The reason for this is because if someone messed with the oil pump and put in a stronger spring, that would account for the high pressure and you could possibly replace that spring with the stock one. But, if the higher pressure is normal for that engine (according to specs)and you exchanged the spring for a weaker one, so your gauge would read ok, then you may damage your engine. Sometimes some people will install a stronger spring when their oil pressure is low (worn engine) with the idea that it will lube better.

Mahalo,
doogdoog

Mahalo,
doogdoog

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buckva

08-16-2005 19:10:02




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 Re: Oil Pressure Gauge Glitch !!!! in reply to Alberta Mike, 08-16-2005 17:25:48  

First I would check the actual oil pressure to see waat is going on. If the pressure is say 35 to 40 you should be fine with your original gauge. Now lets say you gots 50 lbs then I would consider exchangin the oil relief springs with the old engine. Now I ain't never done that on your contenental engine but I have on other engines. IE stronger spring=more oil pressure and weaker spring= less oil pressure.

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Jerry/MT

08-16-2005 18:17:10




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 Re: Oil Pressure Gauge Glitch !!!! in reply to Alberta Mike, 08-16-2005 17:25:48  
Put your Case gauge in a box on the shelf and put it in when you take your tractor to a show. (Over pressuring it can damage it.)Then install a 0-100 pound gauge in the oil pessure line and see what your oil pressure really is. When you know that,get a dash mounted gauge with the right range to monitor this critical measurement.



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Mark - IN.

08-16-2005 20:07:37




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 Re: Oil Pressure Gauge Glitch !!!! in reply to Jerry/MT, 08-16-2005 18:17:10  
Excellent idea, and reletively cheap fix. Will ruin the existing guage, as Mark basically said, that's for sure.

Mark



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txgrn

08-16-2005 17:35:01




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 Re: Oil Pressure Gauge Glitch !!!! in reply to Alberta Mike, 08-16-2005 17:25:48  
Most pressure gauge instruments are a brass tube that is bent into a semicircle. The needle is attached to it. As the pressure increases the semicircle attempts to straighten out. The idea in the design is for the brass to tolerate the stretching and return to the pre-stretched position when the pressure is relieved.

If you overpressure it, you could put a permenant straightening in the tube whereas it wouldn't return to zero and then the upper number's accuracy would be in question.

As far as blowing it up you'd have to put several hundred pounds on it probably beins you are talking about brass and solder.

I don't know where your memory point is hence the pressure above which it can't recover.

Just dunno.

Mark

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