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Old 05-08-2016, 05:12 PM   #1
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oil pressure

what should the oil pressure run on Cummins 425 ISL
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Old 05-08-2016, 05:23 PM   #2
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About 10 @ idle. 30 @ top rated rpm
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Old 05-08-2016, 06:49 PM   #3
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The Cummins electronic engines like the ISL have an oil pressure sensor that gives only two states: "enough" and "not enough". Dash gauges or instrument packages like Silverleaf may interpret "Enough" as 55 psi, but they really don't know the actual pressure becasue the engine ECM doesn't know it either. If there is "enough", it continues to run. If not, it shuts down.
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Old 05-08-2016, 06:56 PM   #4
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Originally Posted by Gary RVRoamer View Post
The Cummins electronic engines like the ISL have an oil pressure sensor that gives only two states: "enough" and "not enough". Dash gauges or instrument packages like Silverleaf may interpret "Enough" as 55 psi, but they really don't know the actual pressure becasue the engine ECM doesn't know it either. If there is "enough", it continues to run. If not, it shuts down.
I don't know about that, but the oil pressure gauge on my previous isl registered 51 psi at road speed.
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Old 05-08-2016, 06:58 PM   #5
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Strange because my VMS 400 does give various readings depending on whether hot or cold or at idle or running with the present ISX.
Our previous ISC with VMSpc did that same, as did the dash gauge. At startup the ISC would go to almost 90 psi on both the dash gauge and the VMSpc and then come down as the engine warmed up.
The last one was on our '02 DSDP on Spartan chassis
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Old 05-08-2016, 07:58 PM   #6
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Originally Posted by Gary RVRoamer View Post
The Cummins electronic engines like the ISL have an oil pressure sensor that gives only two states: "enough" and "not enough". Dash gauges or instrument packages like Silverleaf may interpret "Enough" as 55 psi, but they really don't know the actual pressure becasue the engine ECM doesn't know it either. If there is "enough", it continues to run. If not, it shuts down.

What Gary says is correct for the ISL built during a certain time frame. The same may have been true of other Cummins engines at certain times. It's not universally true for all of Cummins electronic engines.
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Old 05-08-2016, 10:13 PM   #7
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I don't know about that, but the oil pressure gauge on my previous isl registered 51 psi at road speed.
That oil pressure it shows is a number made up by the computer. Cummins engines typically have a fairly low oil pressure so to give people that warm fuzzy feeling they make the number more pallatable😀
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Old 05-09-2016, 02:05 PM   #8
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My 400 runs between 30 lbs & 60 lbs hot. 80lbs at idle cold.
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Old 05-09-2016, 02:48 PM   #9
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My 400 runs between 30 lbs & 60 lbs hot. 80lbs at idle cold.

Our 400 hp ISL runs exactly the same as this.
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Old 05-11-2016, 08:21 AM   #10
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About 10 @ idle. 30 @ top rated rpm
Here is a link. It is listed under useful specs.

http://www.diesel-service-parts.com/cummins-isl.html
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