The reason for the question is that I primed a rebuilt motor yesterday.  Made one B and D cheapo chordless smell so bad that it went into the trash.  Oil pressure quickly shot to 100 psi without any oil sign at rockers.  Put on another chordless, BARELY rotating, and finally got oil to the rockers, keeping pressure at 40 or less with the low rotations.  It was cold, about 36 degrees using 5/30 oil.  Will change the gauge to see if there is any diff.

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

Mike:

Sounds like the oil pressure relief valve is stuck closed.  You shouldn't have that much pressure, with a drill or running.

John - "The Hoosier Hurricane"

John is right.  The oil pressure should be limited by the relief spring in the oil pump.  Disassembly of the oil pump should find a relief valve that’s not working freely.  65 psi oil pressure is expected to be about the  max number for a stock oil pump with cold oil.  Using a speed handle instead of an electric or cordless drill will suffice for building up oil pressure and insuring rockers are oiling adequately.

Lorena, Texas (South of Waco)

Thanks guys. 

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

Yeah. you might have a look at it. A good tight pump can do it though. I can get over 50psi on mine just turning it by "hand" with a 1/4-drive hand "crank" driver

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1955 F-600/272/E4OD// Disclaimer: No animals were injured while test driving my F-600 except the ones I ran over intentionally!

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This post was created using OpenSuSE Linux x64 and Firefox

HT: How much oil pressure do you get when you actually run the engine?!

Paul

I haven't ran mine yet.



I guess I should set it up on a stand! I have a new Melling pump installed. and I did have a look at the pressure relief valve and spring. It shouldn't be sticky at all.....

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1955 F-600/272/E4OD// Disclaimer: No animals were injured while test driving my F-600 except the ones I ran over intentionally!

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This post was created using OpenSuSE Linux x64 and Firefox

Other possibilities for extreme oil pressure besides a stuck oil pump relief valve can include a faulty oil pressure gauge that simply reads too high or a block that has stopped up oil galleries or oil passages.  Mud daubers in my part of the country are notorious for filling in any oil gallery sized holes that they can get to.

Lorena, Texas (South of Waco)

Happens in the Mid-west too. We call them "Mud Wasps".

Frank/Rebop

Bristol, In ( by Elkhart) 

They must be universal.  Anything with a hole can be a victim, including distributor caps!

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.