Oil Pressure 239
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Junior User
Joined: Apr 2012
Posts: 96
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From: Hays Kansas
Oil Pressure 239
Is this normal?
I have a stock 239 that has just under 30psi when cold at idle.
When the truck is warmed up normal temp I have very little psi at idle.
At idle warm it is not on zero but close.
15/30 oil
The motor is not knocking or making any odd sound when the pressure is low.
Thanks Neal
I have a stock 239 that has just under 30psi when cold at idle.
When the truck is warmed up normal temp I have very little psi at idle.
At idle warm it is not on zero but close.
15/30 oil
The motor is not knocking or making any odd sound when the pressure is low.
Thanks Neal
oldmerc
Joined: Jul 2011
Posts: 1,538
Likes: 5
From: Edmonton,Alberta
Would this by chance be a well broken in and much loved engine (OLD) if so then the normal wear will allow leakage past the bearings and the oil pressure will indeed be low . best to check it with a mechanical gauge as ALBUQ F-1 is suggesting I think .
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
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Believe Nothing
Joined: Jun 2004
Posts: 7,514
Likes: 398
From: W. Central FL.
So long as the pressure comes up above idle and maintains pressure with no knocks it will probably live a long time. A higher viscosity oil will possibly increase the pressure.
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Senior User
Joined: Jan 2012
Posts: 277
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From: Sophia, NC
My stock guage reads 20lbs lighter than a mechanical guage. At idle on a cold start it shows 30 lbs but with the mechanical guage it shows 50 lbs. Don't put to much stock in the old gauges. That is after you verifed the actual pressure just peace of mind.
Logistics Pro
Joined: Nov 2011
Posts: 4,685
Likes: 80
From: Northville, MI
Unscrew the sending unit and screw in the mechanical gauge. Most auto parts stores sell inexpensive versions.
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