7080 oil pressure

[CountryCase]

I have a 7080 that when you start it cold holds up around 60 lbs of oil pressure. It will run for maybe 2 minutes before going down to between 5 and 10 lbs. The oil is still cold. It runs smooth. No knocks. Just wondering if there is something I can try before going into deep on this and tearing the engine apart? Thank you for any info you can throw my way.

 

[J Hamilton]

The first thing I would do is check the oil pressure with a good mechanical gauge to see if the problem is with your gauge on the tractor

 

[DrAllis]

Sounds like a rag that's laying on the bottom of the pan that gets sucked up around the screen. Pressure regulator is behind the injection pump vertically screwed into the block. Cold oil relief (80 psi) is threaded into the oil pump. This sounds like starvation of oil. What's the whole story ?? Recent engine work ?? or many many hrs of service and it's just started doing this ?? Where are you taking your oil pressure reading from ??

 

[CountryCase]

About 4000 hrs on the engine. Always run strong. We
dont over work it. I went out in the barn over winter to
start it. Had to jump start it. In hindsight I didnt let it
warm up enough before throttling it up so alternator
would start charging. Thats when it lost oil pressure. I
already had a pressure gauge on it before this
happened.

 

[DrAllis]

So, the story is it had good oil pressure and then lost it (one time)?? Or it has good oil pressure every time I start it and then it falls off ?? I'd say then you have a blown pump body gasket or the oil line from the pump to the block is loose or it blew a gasket depending on WHICH PUMP it has.

 

[CountryCase]

Has good pressure every time I start it then falls off
after just a minute or 2. Im not sure what pump it has.
So it sounds like I need to drop the pan and check for a
blown gasket at the pump?

 

[fastfarmall]

Dr Allis,Leaving rags or waxed papers, from the employees sandwich wrapper, in the bottom of oil pan,i can remember the Block man telling me about that in the day of the D-17,D-19, in the Harvey engine plant! Doesn't sound like that's the problem,on the 7080.