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M380 (Unique Issues) If you have a unique issue with your M380 model coach and it can't be answered in one of the other forums here, then this is where you can list it.....list your M380 Parts here too.

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  #11  
Old 08-09-2019
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Dc2x4drvr Dc2x4drvr is offline
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One of the 380 owners on WOG hooked up a direct reading oil pressure gauge on his ISL400,maybe he will see this thread.
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2004 M380
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Last edited by Dc2x4drvr; 08-09-2019 at 08:31 PM.
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  #12  
Old 08-09-2019
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According to online forums with old silverleaf replies, the 55 psi only reading is standard with all Cummins engines beginning sometime before 2002. It is a switch, on or off, not an analog reading. One post by someone at Silverleaf in 2003 says:


Quote:
Cummins orginally used a variable sensor which allowed the Silverleaf to read actual Oil Pressure. This switch had problems, it was causing Engine Shutdown, through false readings. So, Cummins went to a HardWired Switch which if your Oil Pressure drops to around 8 PSI or so, it will shutdown the engine.
The result is your Silverleaf will always READ 55 PSI, you could have Cummins change the Switch to the variable, but you take the chance of False Engine Shutdown.
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  #13  
Old 08-09-2019
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The Engine computer is J1939, while the M380 dash uses J1708. There is a box that converts some J1939 data to J1708, but some data is read from different sensors. Oil pressure would appear to be one of those.
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  #14  
Old 08-09-2019
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If I'm really getting 0 psi, the automatic engine shutdown should have triggered and I'd at least expect an error code in Silverleaf.
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Rockfall, CT
2007 Double Slide M380 "Bertie"
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  #15  
Old 08-09-2019
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Quote:
Originally Posted by Dc2x4drvr View Post
One of the owners on WOG hooked up a direct reading oil pressure gauge on his ISL400,maybe he will see this thread.
Lance, There just one owner of WOG.
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  #16  
Old 08-09-2019
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What ?
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2004 M380
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  #17  
Old 08-09-2019
chiplamb chiplamb is offline
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My M380 has low warm idle oil pressure but comes up immediately to 25psi above 1kRPM. I think it's the norm. I see 45-50psi going down the road which is SOP for a Cummins, every ISx I've ever had displayed low-ish oil pressure going down the road relative to, say a CAT or DD et.c. I would be alarmed if I saw low (under indicated 25) pressure above 1kRPM or fluctuations on off-throttle which would be indicative of rod bearings.

A couple quarts of Lucas oil stabilizer brought my idle oil pressure up a bit more which reassures me more than anything. I'll put a gallon in when I do the next change, it's good stuff.
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  #18  
Old 08-09-2019
Dan & Cindy Dan & Cindy is offline
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I am the M380 owner who added an analog oil pressure gauge in the engine compartment because I didn't trust the digital data and the dash gauge. The dash oil pressure gauge always dropped to a very low value when idling.
A couple of years ago, when the engine was at normal operating temperatures and I had to stop at a traffic light, the pressure would drop to zero and the warning buzzer would come on. A slight nudge of the accelerator increasing the RPM to +/- 800 would shut down the alarm.

I made a special fitting for the oil pressure switch that allowed me to add a port for a real pressure gauge. It told me that I had about 25 psi pressure when idling a warm engine while at the same time the warning buzzer was sounding. The fitting drawing and other info is attached.

Not long after after adding the pressure gauge, I replaced the engine batteries and the warning buzzer stopped buzzing even though the dash gauge showed zero oil pressure. I now suspect that low voltage and/or an imperfect battery cable connection could be at the root of this problem.
Attached Files
File Type: pdf CUMMINS OIL PRESSURE SWITCH.pdf (277.9 KB, 47 views)
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  #19  
Old 08-10-2019
marvjeanm380 marvjeanm380 is offline
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When we bought our M380 I was concerned about the oil pressure indicated on the gauge. George was the service tech that visit and I asked him about it and he asked me what I wanted it to read. He explained that the gauge was simply a indicator that the engine had oil pressure. When he brought the bus back that day the oil pressure indication was around 40 PSI at idle.
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  #20  
Old 08-10-2019
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Quote:
Originally Posted by Dan & Cindy View Post
I am the M380 owner who added an analog oil pressure gauge in the engine compartment because I didn't trust the digital ...

Not long after after adding the pressure gauge, I replaced the engine batteries and the warning buzzer stopped buzzing even though the dash gauge showed zero oil pressure. I now suspect that low voltage and/or an imperfect battery cable connection could be at the root of this problem.
Thanks, Dan. We're pulling out for a 250 mile drive tomorrow. I'll watch the idle speed, voltage and oil pressure.
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2007 Double Slide M380 "Bertie"
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