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05-08-2016, 04:12 PM
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#1
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Junior Member
Join Date: Aug 2013
Posts: 1
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oil pressure
what should the oil pressure run on Cummins 425 ISL
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05-08-2016, 04:23 PM
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#2
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Senior Member
Join Date: Mar 2010
Location: N. E. Ohio & Lady Lake Fl.
Posts: 1,120
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About 10 @ idle. 30 @ top rated rpm
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05-08-2016, 05:49 PM
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#3
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,678
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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.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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05-08-2016, 05:56 PM
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#4
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Registered User
Join Date: Feb 2012
Location: Troy Mo
Posts: 1,951
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Quote:
Originally Posted by Gary RVRoamer
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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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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05-08-2016, 05:58 PM
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#5
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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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
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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05-08-2016, 06:58 PM
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#6
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Senior Member
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,587
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Quote:
Originally Posted by Gary RVRoamer
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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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.
__________________
Steve Ownby
Full time since 2007
2003 Monaco Signature
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05-08-2016, 09:13 PM
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#7
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Senior Member
Join Date: Mar 2010
Location: N. E. Ohio & Lady Lake Fl.
Posts: 1,120
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Quote:
Originally Posted by loisjop
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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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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05-09-2016, 01:05 PM
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#8
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Jun 2013
Location: Apple Valley CA
Posts: 1,069
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My 400 runs between 30 lbs & 60 lbs hot. 80lbs at idle cold.
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[SIGPIC][/SIGPIC]
Craig & Carolyn Roberts Apple Valley, CA
Toad: 2017 GMC Canyon 4X4 Crewcab
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05-09-2016, 01:48 PM
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#9
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Senior Member
Join Date: Nov 2011
Posts: 884
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Quote:
Originally Posted by DD788Snipe
My 400 runs between 30 lbs & 60 lbs hot. 80lbs at idle cold.
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Our 400 hp ISL runs exactly the same as this.
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05-11-2016, 07:21 AM
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#10
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Senior Member
Join Date: Mar 2010
Location: N. E. Ohio & Lady Lake Fl.
Posts: 1,120
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Quote:
Originally Posted by powderman
About 10 @ idle. 30 @ top rated rpm
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Here is a link. It is listed under useful specs.
http://www.diesel-service-parts.com/cummins-isl.html
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Linear Mode
