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Massey Harris & Massey Ferguson Tractors Discussion Forum

1971 MF 135 High Oil Pressure

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richardp3

12-08-2007 12:38:20

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Oh, one more thing please. My oil pressure gauge has no numbers on it, only tick marks. But when I crank the engine, the oil pressure goes to max right off and never settles back down. How can I tell what my real oil pressure is? If it is high like the gauge indicates, is this a problem and what could be causing it?

Thanks again,
Richard

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Jerry/MT

12-08-2007 18:27:33

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Re: 1971 MF 135 High Oil Pressure in reply to richardp3, 12-08-2007 12:38:20

Two major causes of high oil pressure are plugged oil filters and stuck closed relief valves. You can get plugged passages that cause a high reading also but it is rarer. If your filter isn"t plugged than you"ll have to get at the relief valve and check it out.

Rarely does a bourdon type oil pressure read read high unless it failed under high pressure and stuck there. (If you have a strain guage electrical oil pressure gauge there are probably are some failure modes that can cause a high reading).

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Phil25

12-08-2007 16:38:25

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Re: 1971 MF 135 High Oil Pressure in reply to richardp3, 12-08-2007 12:38:20

Saw your questions and good reply's also, they were helpful to me before on this situation.
I had a 135 also that leaked oil from the drain hole suspected oil seal, but found the oil pump relief had stuck and the high pressure was blowing out past a small frost style plug used in the oil passageway to the valve gear[ back side of the block] it will reguire splitting the tractor to get to it, if you do seperate them, at least check the left inside surface of the block flywheel area for a telltale stream of oil from about 11 o.clock downward.
Might be best to have just run the engine for a while till its dripping and then seperate it?
good luck hope it helps

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richardp3

12-08-2007 19:26:38

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Re: 1971 MF 135 High Oil Pressure in reply to Phil25, 12-08-2007 16:38:25

Thanks for the great replies. I just purchased this tractor and I'm very happy other than the oil pressure/weep hole leak.

I'm going to change the canister oil filter out with a spin on conversion kit I ordered here online. For all I know the oil filter hasn't been changed in some time.

If that doesn't help I will check the relief valve on the oil pump. Does this require splitting the tractor, or can I check it by dropping the oil pan? (I ordered a MF manual with the oil filter and won't have it until next week). Thanks again for all the help.

Richard

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Texasmark

12-16-2007 07:38:46

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Re: 1971 MF 135 High Oil Pressure in reply to richardp3, 12-08-2007 19:26:38

Your oil pressure relief valve could be sludged up since you said that oil changes apparently been done in a timely manner. You might change the oil a couple of times and maybe do a gunk desludge just before the oil change and loosen up the gunk to see if it starts working before you do anything drastic.

And, like you said, you could have faulty instruments.

Mark

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MF Poor

12-08-2007 16:53:10

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Re: 1971 MF 135 High Oil Pressure in reply to Phil25, 12-08-2007 16:38:25

Absolutely right. I didn't notice until I saw your reply that the question below about oil from the weep hole and the high oil pressure were from the same guy. Another spot where high oil pressure will cause a leak is a vent hole near the tach drive (on the rear of the block) I've helped to fix about a dozen leaky Perkins 3-bangers. So far, NONE had issues with the rear main. It can happen but it's not that common.

I've seen a couple Perkins with high oil pressure "fixed" with external pressure relief valves plumbed into the oiling system.

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MF Poor

12-08-2007 12:54:31

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Re: 1971 MF 135 High Oil Pressure in reply to richardp3, 12-08-2007 12:38:20

Hook up a "universal" oil pressure gauge to verify true pressure. Perkins oil pump has an internal "spring and plunger" relief valve that has been known to stick.

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