Oil pressure too high - 8N (1958)

PatrickE · Nov 21, 2020

My oil pressure gauge glass cracked and I have replaced it with a new gauge. At the same time, I drained and replaced the oil, and put in a new filter and gasket. It always ran at 50 psi before but now it is glued to the top and the pressure is blowing oil out the gasket on the filter. I have tried reseating, and putting in another gasket. Can't get it to stop the massive leaking.

I have read in this forum that there is an oil pressure relief valve that might be stuck, but I can't find anything in my manuals that tells me where it is to check/fix. Can someone tell me where to find it? Also, since other than changing the oil, the only other change was replacing the oil pressure gauge, is it possible I did something wrong there or that the gauge is bad? Anything else I should check or could have done wrong?

Thanks.

TheOldHokie · Nov 21, 2020

(quoted from post at 10:28:15 11/21/20) My oil pressure gauge glass cracked and I have replaced it with a new gauge. At the same time, I drained and replaced the oil, and put in a new filter and gasket. It always ran at 50 psi before but now it is glued to the top and the pressure is blowing oil out the gasket on the filter. I have tried reseating, and putting in another gasket. Can't get it to stop the massive leaking.

I have read in this forum that there is an oil pressure relief valve that might be stuck, but I can't find anything in my manuals that tells me where it is to check/fix. Can someone tell me where to find it? Also, since other than changing the oil, the only other change was replacing the oil pressure gauge, is it possible I did something wrong there or that the gauge is bad? Anything else I should check or could have done wrong?

Thanks.

Going to be tough to help with that - the last 8N made was in 1952. So do you really have an 8N or something newer?

TOH

Mad Farmer · Nov 21, 2020

(quoted from post at 07:28:15 11/21/20) My oil pressure gauge glass cracked and I have replaced it with a new gauge. At the same time, I drained and replaced the oil, and put in a new filter and gasket. It always ran at 50 psi before but now it is glued to the top and the pressure is blowing oil out the gasket on the filter. I have tried reseating, and putting in another gasket. Can't get it to stop the massive leaking.

I have read in this forum that there is an oil pressure relief valve that might be stuck, but I can't find anything in my manuals that tells me where it is to check/fix. Can someone tell me where to find it? Also, since other than changing the oil, the only other change was replacing the oil pressure gauge, is it possible I did something wrong there or that the gauge is bad? Anything else I should check or could have done wrong?

Thanks.

Changing oil/filter and replacing the gauge is not going change your oil pressure.

I suspect the gauge is defective/cheap chi-com and the gasket too.

I changed the oil last time a filter from here (usually use fram or napa). I changed gasket too. It leaked. Put old gasket back in no leaks.

Anybody have problems with bad oil filter gaskets from here? Most times I don't change the gasket and no leaks then either. Could have been a fluke.......

Mad Farmer · Nov 21, 2020

P.S. I bet Pat's finger hit the 5 by mistake instead of the 4....

Btzj02 · Nov 21, 2020

Joe.S.AK · Nov 21, 2020

Just from a common sense position the changing of oil or an oil pressure gauge shouldn't cause sudden high pressure problems. That leaves the filter replacement as the suspected weak link here. Of course it's possible that there is some internal blockage inside the filter, possibly from a manufacturing oversight or something that rode it's way into the filter (like a random piece of thin plastic wrap or a bit of shop residue). So, logically, the new filter seems to be the weak spot in the operation.

As a question about the oil packaging - was it poured from quart bottles or a bulk container like a 5 gallon can? If from a bottle were there "safety seals" on the mouths of the bottles? If so, a small bit of that seal *could* be a source for plugging up the oil filter or the oil system. Something to consider.

Of course, a chunk of internal "stuff", like hardened sludge or other such like material could have shifted internally to block a passageway or the filter, itself, but as a logical starting point that newly installed filter could, maybe, be the source of your over pressure problem.

You sure can't put anything past that TOH - he's right on top of things. :~) - Joe -

PatrickE · Nov 21, 2020

(quoted from post at 11:22:19 11/21/20)

(quoted from post at 10:28:15 11/21/20) My oil pressure gauge glass cracked and I have replaced it with a new gauge. At the same time, I drained and replaced the oil, and put in a new filter and gasket. It always ran at 50 psi before but now it is glued to the top and the pressure is blowing oil out the gasket on the filter. I have tried reseating, and putting in another gasket. Can't get it to stop the massive leaking.

I have read in this forum that there is an oil pressure relief valve that might be stuck, but I can't find anything in my manuals that tells me where it is to check/fix. Can someone tell me where to find it? Also, since other than changing the oil, the only other change was replacing the oil pressure gauge, is it possible I did something wrong there or that the gauge is bad? Anything else I should check or could have done wrong?

Thanks.

Click to expand...

Going to be tough to help with that - the last 8N made was in 1952. So do you really have an 8N or something newer?

TOH

LOL - 8N - #0308 stamped on the block! I don't know why I thought it was a 1958. I bought it from a neighbor about 10 years ago. He had rebuilt it. It's run great.

PatrickE · Nov 21, 2020

I guess I'll replace thegasket, filter and then the gauge. (gauge was from Yesterday's tractors) If that doesn't work, I'll be back! Oil came from a 2.5 gal container so I don't think I dropped anything in when filling.

Thanks.

TheOldHokie · Nov 21, 2020

(quoted from post at 12:07:47 11/21/20) Just from a common sense position the changing of oil or an oil pressure gauge shouldn't cause sudden high pressure problems. That leaves the filter replacement as the suspected weak link here. Of course it's possible that there is some internal blockage inside the filter, possibly from a manufacturing oversight or something that rode it's way into the filter (like a random piece of thin plastic wrap or a bit of shop residue). So, logically, the new filter seems to be the weak spot in the operation.

As a question about the oil packaging - was it poured from quart bottles or a bulk container like a 5 gallon can? If from a bottle were there "safety seals" on the mouths of the bottles? If so, a small bit of that seal *could* be a source for plugging up the oil filter or the oil system. Something to consider.

Of course, a chunk of internal "stuff", like hardened sludge or other such like material could have shifted internally to block a passageway or the filter, itself, but as a logical starting point that newly installed filter could, maybe, be the source of your over pressure problem.

You sure can't put anything past that TOH - he's right on top of things. :~) - Joe -

Keep in mind this is a bypass oil system. You could remove and completely plug the oil filter takeoff and it would not move oil pressure more than a couple PSI if that There is more to this story than a missed keystroke.

TOH

David G · Nov 21, 2020

Are you sure the old gasket is not stuck on there?

PatrickE · Nov 21, 2020

(quoted from post at 14:20:25 11/21/20) Are you sure the old gasket is not stuck on there?

The gasket that I had on there, and the two new ones I tried were the soft rubber kind. I had even tried putting the old one back in.

Anyway, seems like we have been successful with the latest one! It is a little harder thicker rubber and seems to have seated better. I think the first ones were sliding off.

I can't tell you how much I appreciate this forum!

Bill M. From Illinois · Nov 21, 2020

I had excessive oil pressure that pegged the gauge also. It would drop down to a reasonable level when warmed up. I fought the problem for a while and found the oil was not getting to the oil pressure relief valve. I fished around with a piece of mig wire and blowing air into to plug hole and it must of worked because oil pressure went back to normal. After oil is pressurized and leaves pump it goes to oil galley but also oil pressure relief, and excess pressure oil is fed into camshaft cover. It must have plugged with sludge or crud where the line that is cast in block makes a 90 bend. I changed oil and filter immediately after and all is good.

Tim PloughNman Daley RIP · Nov 22, 2020

Time to get out your ESSENTIAL PARTS & SERVICE Manuals. Don’t have them? And ya wanna be an N-Owner? Next DON”T GUESS as to what the problem is – you can go out and buy every new part under the sun, replace, and still have the same problem. True Root Cause Problem Solving methods are required for any and all problems. Forget that number – it’s not a serial number anyway. It’s also not a date code ID tag. S/N’s mean relatively nothing unless you have an early model worth total restoration. What is important is to know if you have an early or late 8N. The early has a front mount distributor, later 8N has the angle (side) mount distributor, for one obvious difference. YT doesn’t manufacture parts, they only sell from a select few suppliers so that doesn’t matter either –your gauge is probably OK. Did the old one work even with the cracked lens? It will ya know. You say old one read 50 PSI before –that is pegged as OEM N Oil Gage scale is 0-50 PSI, and so you had the problem before you started. Get your manuals and read before you do anything else –the OEM 8N Operator’s Manual and the Clymer/I&T FO-4 Manuals are good starts.

FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:

Tim Daley(MI)

Oil pressure too high - 8N (1958)

PatrickE

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TheOldHokie

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Mad Farmer

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Mad Farmer

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Btzj02

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Joe.S.AK

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PatrickE

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PatrickE

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TheOldHokie

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David G

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PatrickE

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Bill M. From Illinois

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Tim PloughNman Daley RIP

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