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Oil Pressure Results

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BOBCD

09-08-2006 17:43:58

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I mounted an oil pressure gauge 100 psi as you guys suggested. The tractor is 1950 SA.
At start up it held 35 psi for about 30-45 min and slowly drop pressure, when the tractor was hot under load cutting heavy grass in 1 st gear at about mid throttle, she stayed at 13-18 psi for the next 3-4 hours. I'm wondering if this tractor is ready for an overhaul or is that an ok range and if I can hold off for awhile? I will do a compression test next.I run 30 wt. non-detergent per manual and change every 50 hrs. So is this a normal range?
Thanks,
Bob

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BOBCD

09-09-2006 07:20:34

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Re: Oil Pressure Results in reply to BOBCD, 09-08-2006 17:43:58

I am a worry wart, I guess you could tell that from my post:) You can get 30 wt. non detergent at TSC, not sure about all the technical specs as to whats in it, but I will switch to the multi grade detergent after I drop the pan and clean out any sludge. I want to check out the oil pump any way. Thanks again for your input.
Bob

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Daniel H.

09-09-2006 16:18:17

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Re: Oil Pressure Results in reply to BOBCD, 09-09-2006 07:20:34

More than likely your going to find the cover plate on the oil pump is warped. Mine was; I changed it and it made a big improvement in the oil pressure. The cover is cast aluminum and the spring pressure does a number on it. You probably won't see it unless you take the cover off and dress it on a piece of fine sandpaper taped to a piece of plate glass. Some can be trued up that way. A new cover was around $80 two years ago. I would change the spring and you will need a cover gasket, it acts a shim. Of course, your bearings may still be worn.
Good Luck.

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BOBCD

09-10-2006 09:14:38

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Re: Oil Pressure Results in reply to Daniel H., 09-09-2006 16:18:17

Thanks Daniel, will check it out soon, I will take a look this fall and check things out.

Where did you get cover & spring from?

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Andy Martin

09-09-2006 05:57:20

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Re: Oil Pressure Results in reply to BOBCD, 09-08-2006 17:43:58

That is plent of oil pressure unless you just want to overhaul the engine. If it was 2 to 3 psi hot then I'd get a little worried but I'd put 20w50 in it and raise it a few pounds.

You'll never hurt an old Farmall changing to detergent. I've heard lot's of fears but not one actual instance.

By the way, detergent oil does not clean the engine, it merely maintains particles in suspension which helps slow sludge development.

If you are a worry wart, pull the pan and plastigage the rods, then check the oil pump and repair if necessary. The engine is not new but it is not worn out either.

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Nat 2

09-09-2006 00:19:27

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Re: Oil Pressure Results in reply to BOBCD, 09-08-2006 17:43:58

50-60 PSI is more appropriate when cold. Your oil pressure is definitely pretty low.

I've been told that you can't get "non-detergent" oil nowadays. Even IH's Low Ash, which I always believed to be non-detergent, has detergents in it.

50 hours seems like an awful short time between oil changes... Maybe you aren't leaving the oil in the tractor long enough to let the pressure build up? :) (just kidding!)

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justin w

09-08-2006 21:01:53

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Re: Oil Pressure Results in reply to BOBCD, 09-08-2006 17:43:58

many will say run it as is, but I would definately be overhauling that engine.. You may have several problems at hand: Worn crank bearings, bad pressure regulator valve or spring, warped oil pump base plate, or just a worn out oil pump. Doing a total rebuild covers all these potential problems.

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