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Farmall & IHC Tractors Discussion Forum
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1940 M oil gauge problem

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Dandy7

02-17-2006 08:41:39




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I put a new gauge on, but it still doesn't work. When I start the tractor the needle flips all the way over. Can the oil line cause this? Is there a tried and true way of cleaing the line? thanks




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Hermit

02-17-2006 17:49:39




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 Re: 1940 M oil gauge problem in reply to Dandy7, 02-17-2006 08:41:39  
Since the oil flow from the pump is divided between the filter and the rest of the oil system, is it possible that a completely or mostly clogged filter or clogged filter return line to cause high pressure? Just a thought.



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Nat 2

02-17-2006 09:13:08




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 Re: 1940 M oil gauge problem in reply to Dandy7, 02-17-2006 08:41:39  
The laws of physics are a cruell mistress. There is no possible way for the oil gauge to be reading "too high" unless the gauge is faulty. Since two different gauges do the same thing, and the likelihood of two different gauges being bad, especially when one is brand new, is almost zero, then it's giving you a legitimate pressure reading.



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chadd

02-17-2006 09:08:49




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 Re: 1940 M oil gauge problem in reply to Dandy7, 02-17-2006 08:41:39  
If the engine is cold, then the needle on your M should get very close to pegging the gauge. It is supposed to have a maximum of about 75 psi of oil pressure, so that sounds about right for an engine in good condition. Like El Toro said, let it run a while and I am almost positive it will fall a little. Now if you were to put on a gauge that goes to 100 and find numbers above the maximum, there is something wrong, as the relief valve should be keeping your oil pressure at or below about 75 psi. If it ain't broke, don't fix it.

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El Toro

02-17-2006 08:56:35




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 Re: 1940 M oil gauge problem in reply to Dandy7, 02-17-2006 08:41:39  
If your oil pressure gauge goes to full scale when the engine is running, I don't think you have a problem with the oil line. You should install a gauge that indicates in psi increments that goes from 0 to 100 psi. Your oil pressure will decrease when the engine is at operating temp. Hal



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Dandy7

02-17-2006 09:17:34




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 Re: 1940 M oil gauge problem in reply to El Toro, 02-17-2006 08:56:35  
The gauge stays pretty much pegged to the right even after it has been operated awhile. I didn't think it was a problem until i discovered I was down about 3 or four quarts and the gauge still showed good pressure. I check the oil each time now, but got concerned about the gauge.

thanks



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RustyFarmall

02-17-2006 10:34:13




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 Re: 1940 M oil gauge problem in reply to Dandy7, 02-17-2006 09:17:34  
The amount of oil in the pan is not necessarily related to oil pressure. If there was no oil in the pan, naturally there would be no pressure, but if the oil pump pick up tube is immersed in oil, you WILL have oil pressure. You checked the oil level, and faound it was down 3 or 4 quarts, which means you still had 4 or 5 quarts in the pan, which is enough to immerse the pump, so naturally you still had pressure. But, before you ask, no, it is not OK to operate the tractor with only half enough oil in it.

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