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Minneapolis Moline Tractors Discussion Forum
:

Oil pressure

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Dpittman

08-10-2019 16:10:53




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I'm sure this has come up lots of times before but I'm gonna rehash it again. Went on a 30 mile FFA fundraiser ride today on our ZA. Started off with 40 psi on the oil pressure. Slowly but surely psi dropped off the hotter the engine got until it was down to 18 psi at road speed, 10 psi at idle. Fresh oil and filter using 10-40 and a spin on Wix filter. Same setup I have on our other Z that doesn't have a problem. What else should I be looking for besides a tired pump which is obviously my first suspect? Engine never got hot and ran quite well the whole day. Thanks. DP

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Charlie Biler x

08-15-2019 14:24:56




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 Re: Oil pressure in reply to Dpittman, 08-10-2019 16:10:53  
Dpittman,
Generally the symptom you describe is too much end play in the oil pump. You need two to four thousandths end clearance. Anything under two will bust the drive gear and any more than four thousandths will cause the pressure to dive on warmup.
Most people use the too thick gaskets that come in the gasket sets. I have a hard time imagining how you get two to four clearance with a stack of ten thousandths gaskets, that the gasket makers supply.
It sounds funny but the real problem is it is so darn hard to get the really thin gasket material. When I order thin gasket material; the factory demands a minimum of a hundred pounds of one thickness material. That is a several lifetimes supply for making those thin gaskets.
Best of luck.

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Alan K

08-12-2019 08:05:41




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 Re: Oil pressure in reply to Dpittman, 08-10-2019 16:10:53  
Generally on the RE engines you lose about 5-7 psi after warm up.



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swmolines

08-11-2019 10:55:58




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 Re: Oil pressure in reply to Dpittman, 08-10-2019 16:10:53  
If this was the first oil change using high detergent oil, the sludge inside the engine could be loosening and clogging the oil pick up screen.



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Dpittman

08-12-2019 05:01:25




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 Re: Oil pressure in reply to swmolines, 08-11-2019 10:55:58  
Been using high detergent oil since 09 when I rebuilt the engine. When I got down to the screen then it was not a pretty sight. I really don't know how it had oil pressure at all. I think I'm gonna try turning up the pressure next time I get it warmed up really good. Keep in mind this is not a work tractor, it gets run often enough to keep oil on the cylinders and the battery charged. Just kind of unsettling to look down and see a pressure gauge not where it was when you started out at that morning. Thanks again.

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swmolines

08-12-2019 08:30:19




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 Re: Oil pressure in reply to Dpittman, 08-12-2019 05:01:25  
I know what you mean. I used HD oil a rebuilt engine thinking it was clean enough to handle any sludge that remained. Several hours later it started loosing oil pressure due to sludge clogging the pickup screen.



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Dpittman

08-10-2019 18:01:30




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 Re: Oil pressure in reply to Dpittman, 08-10-2019 16:10:53  
Bottom end is in good shape as far as I can hear, in other words I don't hear any rods banging or any other alarming sounds. As for the shims as far as I know it's still got the factory shims in it. The problem was worse before the filter change up so that did help the problem, I just can't remember when the problem first started. I did consider turning the pressure up after it warmed up but then would pressure be too high when it's cold? Don't know if 50 psi would be too much when it's cold or not. Got things to think about though. Thanks again.

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Dennis P

08-10-2019 16:33:14




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 Re: Oil pressure in reply to Dpittman, 08-10-2019 16:10:53  
Have you tried adjusting oil pressure at pump when hot? Also, there are paper “shims” between oil pump and block. Manual tells how to shim correctly.



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molinegb

08-10-2019 18:30:10




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 Re: Oil pressure in reply to Dennis P, 08-10-2019 16:33:14  
Don't get excited as long as it maintains 10 at hot idle. Old TC stuff lucky to hold 5. Check thrust.



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molinegb

08-10-2019 17:41:17




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 Re: Oil pressure in reply to Dennis P, 08-10-2019 16:33:14  
Bottom end on good shape? Did have problem before filter changeup?



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neverfear

08-10-2019 16:20:50




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 Re: Oil pressure in reply to Dpittman, 08-10-2019 16:10:53  
I don't think that's too bad for using a multi weight oil.



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