Too much oil pressure?

TXZane · Mar 10, 2015

I just now changed the oil in my new to me 400 and put in 15w-40. I didn't run it very much before hand but I believe it to have a recent rebuild due to no smoke and very high oil pressure. It now has 70 pounds at idle when warm. I didn't think too much of it but now my head gasket is weeping oil all the way around. In one spot there is enough oil that it is running down the block. Has anybody else experienced this? I'm hoping that changing the oil back to 10w-30 will help. I guess tightening the head bolts will be the next thing to try after that.

john *.?-!.* cub owner · Mar 10, 2015

Look it over very good to make sure it is head gasket and not valve cover and then just running along the edges of head gasket.

gbs · Mar 10, 2015

what is it running at full throttle

Bob · Mar 10, 2015

First off, have you verified the gauge is accurate?

David G · Mar 10, 2015

What did it run with the 10-30?

PretendFarmer · Mar 10, 2015

If it is leaking from the gasket, odds are whoever rebuilt it never retorqued the head bolts. That should be done at least 2 times after the initial torque. It should be ran around then retorqued then retorqued again after a few days or so. Remember to adjust/check valve lash every time.

old · Mar 10, 2015

Bad gauge will do that as will a relief valve that sticks or is cranked down to tight etc.

leon · Mar 11, 2015

My Super C weeped oil through a newly replaced head gasket for a while. I concluded it was coming through the gasket, between the metal outer layers. I run it with stop-leak for a while, then quit the stop leak. The leak didn't return.

TXZane · Mar 11, 2015

I think that it ran at about 60 pounds with 10-30. The gauge doesn't move up at full throttle. It may be pegged as it is. I'll try a new gauge too I guess.

John M · Mar 11, 2015

Dad rebuilt his M back in 78 or 79 or so. Its had some hard hours put on it since and hasnt been touched since. The gauge always pegged out at full throttle, at idle it would go a little above half way. We always wrote it off to a bad gauge, but ran it anyways. After he died and I restored it, I put a pressure gauge on it to check the oil pressure to see if I needed to do any engine work. Wide open, it was 70 +-, at idle 55 +-. Put a new oil gauge on it and it still pegs the gauge to this day.

Icuby · Mar 11, 2015

I installed a rebuilt engine in a 756D once and put in new original CaseIH relif spring and it did the same thing. Put old one back in and was fine.

todd hamilton · Mar 11, 2015

it's not seated in, field work it 4 hours, re torque head bolts with engine warm, field work it again

gab · Mar 11, 2015

My Super M has 15/40 oil and a 75 lb. gauge I think. Has the gauge pegged cold and doesn't drop much warm, haven't ran it all winter. I'd retorque it and clean good and try again before I got too excited. I think pressurized oil to the rocker arms only goes through the head gasket on the right outer center of the head.

TractormanNC · Mar 11, 2015

Just exactly what it is supposed to do. The spec is 60-70 pounds hot at wide open throttle.

D beatty · Mar 12, 2015

I have a Farmall M and a Farmall 450 and thet both hold 75 lbs. cold or hot and are using Rotella 15-40 all year round.

mkirsch · Mar 12, 2015

Get yourself one of these:

http://www.harborfreight.com/engine-oil-pressure-test-kit-98949.html

Use it to verify the actual oil pressure, and that your gauge is accurate.

Too much oil pressure?

TXZane

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john .?-!. cub owner

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gbs

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Bob

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David G

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PretendFarmer

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old

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leon

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TXZane

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John M

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Icuby

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todd hamilton

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gab

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TractormanNC

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D beatty

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mkirsch

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