Oil Pressure Numbers
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Oil Pressure Numbers
I have a 1987 6.9 with 220k miles....Recently my oil engine light went on as well as low oil pressure depicted on the guage. So I bought a mechanical guage. I now have 12lbs. of pressure at idle warm and 37lbs at running speed warm. Flucuating at pressure with different speeds.
While at idle and reving the throttle the pressure guage is very responsice to the throttling. Are these numbers ok and if not should i replace the pump or replace the oil pressure relief valve?? if there is one. Is replacing the pump a big job. I did determind that the wire from the oil sending unit are bad and goung to replace in the nere furture.
Any help would bw appreciated.
While at idle and reving the throttle the pressure guage is very responsice to the throttling. Are these numbers ok and if not should i replace the pump or replace the oil pressure relief valve?? if there is one. Is replacing the pump a big job. I did determind that the wire from the oil sending unit are bad and goung to replace in the nere furture.
Any help would bw appreciated.
Post Fiend
Joined: Nov 2001
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From: Topsfield, MA
Oil Pressure Numbers
To determine if the pump is at fault, or if it's the bearings, I need a little more information. How much pressure do you have when you first start the engine when it is cold at idle? It should be between 40-60psi. If, it is between 40-60psi, and drops to 12psi when the engine is warm, the bearings are at fault and the engine just plain needs a rebuild soon. My dad's 351 has 135k miles and it'll start up with 50psi and drop to about 8psi when it's warm, and when you get the RPMs up, it'll go up to about 15-20psi. But what kind of numbers are you pulling at idle when cold....then it's 12psi at idle when warm?
Lead Driver
Joined: Feb 2000
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From: Palm Bay, Florida
Oil Pressure Numbers
You say you've got a 6.9--thats a Diesel, right?? I think you'd get better answers over on the Diesel forum, a diesel is different than a gas V8, so stuff that applies won't really apply.
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Oil Pressure Numbers
Three Thoughts.
1. The rule of thumb is to have 10 lbs of oil pressure for every 1000 rpm when warm. Anything more than this is not really necessary. Most race cars use this as the standard.
2. Be sure your oil filter is not becoming plugged or collapsed internally. This is a common problem.
3. Don't bet that the oil pressure gauge you purchased is very precise especially at low pressures unless it is a high dollar race car type unit. Most are not and are pretty much the functional equivalent of an idiot light.
I'd look at all the above before tearing into the engine.
1. The rule of thumb is to have 10 lbs of oil pressure for every 1000 rpm when warm. Anything more than this is not really necessary. Most race cars use this as the standard.
2. Be sure your oil filter is not becoming plugged or collapsed internally. This is a common problem.
3. Don't bet that the oil pressure gauge you purchased is very precise especially at low pressures unless it is a high dollar race car type unit. Most are not and are pretty much the functional equivalent of an idiot light.
I'd look at all the above before tearing into the engine.
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