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77 oil pressure to high?

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Jack

09-24-2001 17:27:36

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My oil pressure gage is pegged. Plugged filter? rielef valve plugged? Is the engine getting oil in this condition?

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Jake

09-27-2001 22:33:36

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Re: 77 oil pressure to high? in reply to Jack, 09-24-2001 17:27:36

I've got a Oliver gauge that will show a max pressure however a test gauge in my shop shows the correct 20#. Check this out before taking any thing apart. If the pressure was that high you would possibly be blowing oil from front or rear seals.

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Jack

09-25-2001 18:49:35

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Re: 77 oil pressure to high? in reply to Jack, 09-24-2001 17:27:36

Pegged as in Maxed out. I changed my oil and filter tonight still no change. I also pulled the casting off that holds the oil filter and cranked it over. It squirted oil out the front port. I also put a rubber tube in the rear port and blew through it, no blockages. Last year I had this tractor on a dinometer and it put out 34HP. I am not aware of any major work done to this tractor. Maybe it is just a tight engine. I am curious, Where is the relief valve located? Is it under the two bolt flange front right of the engine?

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Scott Green

09-26-2001 10:04:57

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Re: Re: 77 oil pressure to high? in reply to Jack, 09-25-2001 18:49:35

Jack , the oil relief valve is located on the side of the timing gear houseing. I foget the acual size , but it looks like a 7/8" hex head. Just unscrew that hex head. Then pull out the spring and oil preasure cup. Sounds to me like you just have a good tight engine. Like I said earlyer , the better running ones I've had and been around , all pegg the "Oliver" oil gauges.

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Paul Stanley

09-25-2001 21:13:39

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Re: Re: 77 oil pressure to high? in reply to Jack, 09-25-2001 18:49:35

If you want the manual trouble shooting procedures here they are:

1. Wrong Grade of oil.

2. Oil pressure relief valve not working properly. Remove and clean, Inspect spring for crack or breakage. No adjustment. Replace if questionable. INspect oil galleries and lines for obstruction. Too high oil pressure causes excess oil constumption and deposits

3. Faulty oil pressure gauge. Check oil pressure with a known accurate gauge. Clean out oil gague line and replace gauge if necessary.

The book says your oil pressure relief valve is located on the right front side of the crankcase and extending into the main oil gallery.

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Dean

09-25-2001 09:35:44

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Re: 77 oil pressure to high? in reply to Jack, 09-24-2001 17:27:36

Your gauge should read whatever is specified in the manual; mine sure does. You can borrow a known accurate mechanical gauge from your tractor mechanic or auto shop and attach it to the block where the oil line runs up to the gauge. This will confirm that a high pressure does indeed exist.

I think you are on the right track. I'd check for a clogged filter, then a stuck relief valve. No, the engine is not getting oiled, at least not with clean, filtered oil. Pressure is nothing more or less than the resistance to flow. An extremely high pressure indicates an obstruction. It's possible that the gauge is toast but I wouldn't bet my cookie jar money on that one!

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City Slicker

09-25-2001 09:06:22

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Re: 77 oil pressure to high? in reply to Jack, 09-24-2001 17:27:36

Please excuse my ignorance, I am new at this and was wondering what you mean by pegged. Is your gauge maxed out and reading all the way to the top, or is it not moving at all?

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Scott Green

09-25-2001 06:26:51

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Re: 77 oil pressure to high? in reply to Jack, 09-24-2001 17:27:36

Oliver gauges are low oil preasure ones. If it is pegged , and stays that way after the tractor is warmed up , that is how it should be. Sounds to me like you have a good engine. The better running olivers I have been around , have pegged the oil gauge.

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