Oil pressure reads nearly 100 psi when cold.

[Jeeper10]

My oil pressure is reading very high until it warms up for a while. The gauge reads nearly 100 psi. I am going to change the oil very soon as I have no idea what type or how long it's been in there as I just brought the deuce home yesterday. Should I be concerned?

 

[doghead]

No.

 

[drivebymashing]

Mine does the same thing. Around 30 minutes later is goes back to 40's

 

[steelandcanvas]

Quite a bit of difference...mine starts cold at about 37 PSI and runs a needle's width above 30. I have about 20K miles on the motor, and a fresh oil change. Hmmmmm.

 

[Jeeper10]

Thanks everyone. This is my first big'ish truck and first ever Diesel. The engine only has about 7k on since the army rebuilt it back in 1991 by the looks.

 

[rustystud]

Sounds like the side oil pressure regulator is hanging up a bit. The main oil pressure from the oil pump is between 100 to 120 psi. It is then regulated down to about 30 to 40 psi. My truck puts out 110 psi and is regulated to 35 psi. Like "Doghead" said don't worry about it. After you drive it some more it should free-up by itself.

 

[NovacaineFix]

Sounds like the side oil pressure regulator is hanging up a bit. The main oil pressure from the oil pump is between 100 to 120 psi. It is then regulated down to about 30 to 40 psi. My truck puts out 110 psi and is regulated to 35 psi. Like "Doghead" said don't worry about it. After you drive it some more it should free-up by itself.

Like they said, start to worry if it starts to blow oil filters and the o-rings out. Sounds like the motor is a little tight (good) and like Rusty said, it should free up after a bit.

 

[gimpyrobb]

You can do a quick check just for your own knowledge. Remove the electrical sending unit on the pass side at the rear of the motor, and screw in a mechanical gauge. That will give you a true reading.