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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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  #81  
Old 4 Weeks Ago
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Quote:
Originally Posted by Dc2x4drvr View Post
The BB manual shows p/n 1947431,oil pressure sender, I think your pic shows part of this #.
I finally got around to researching this. Thanks! I didn't realize how much info was in that parts document. The 1947431 part is shown in the exact location where the VDO switch was removed and where I now have my mechanical gauge. It is listed as a "Sender, Oil Pressure, 0-150 psi". So that's pretty clear. It's a proportional sender despite being stamped as a "Switch". (A close look confirms my VDO switch is marked with that number.)

That's also consistent with the fact I lost both gauges when I removed it.

So, it seems reasonable that I can measure oil pressure there and get a valid oil pressure reading. I think my next step is to put a "T" in there and get both the mechanical and the original gauges working to compare them.

I don't know what's in the sensor location on the other side, which is where Doc installed his adapter and where the Cummins manual shows an OP sensor.

The learning curve on this coach and for Diesel engines is really steep.
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2007 Double Slide M380 "Bertie"

Last edited by RVinCT; 4 Weeks Ago at 02:18 PM.
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  #82  
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I don’t want to muddy up the water, but, the info from the sender is going first to the PRX module, then to the gauges..I’m wondering if the module is bad.
Randy might have one in stock, they are obsolete..
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  #83  
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Quote:
Originally Posted by Dc2x4drvr View Post
I don’t want to muddy up the water, but, the info from the sender is going first to the PRX module, then to the gauges..I’m wondering if the module is bad.
PO reported similar OP gauge symptoms to Parliament in 1/2014 (gauge reads for about 15 seconds after start then goes to zero). Parliament said they had seen PRX module failure for circuit that generates OP gauge readings on several coaches -- couldn't be fixed for reason Lance and others have pointed out (no modules available). Parliament used their engine computer to verify oil pressure readings and said they were in normal range. Advised PO to either install a new direct read OP gauge or watch for warning light. PO chose to watch for a warning light. I'm hoping this thread will clarify how to install a direct read OP gauge so I can copy it.
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2004 M380 SS
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  #84  
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Since the PRX is also the trigger for the warning light I'm surprised you could see a false zero on the gauge and not see the warning light. The PRX has one other electrical analog input (along with the two air inputs) which is the fuel gauge. As I noted, when my fuel gauge went to zero the one time it also showed the low fuel warning.
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  #85  
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Quote:
Originally Posted by DonB View Post
Since the PRX is also the trigger for the warning light I'm surprised you could see a false zero on the gauge and not see the warning light. The PRX has one other electrical analog input (along with the two air inputs) which is the fuel gauge. As I noted, when my fuel gauge went to zero the one time it also showed the low fuel warning.
And herein lies the reason I’m so interested in this thread. The first repair order mentioning the inop OP gauge was 6 years and 50,000 miles ago so my engine is clearly getting enough oil pressure. No warning lights, no shutdowns. Road Relay reads 55psi (yes, I know this is a “fudged” number). I’m as confused as everyone else. All I really want is a roadmap for getting a reasonably accurate number I can monitor.

Thanks to all for contributing!

Jim
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  #86  
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I have PRX modules in stock.
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  #87  
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I installed a T and connected both the new mechanical and the original VDO switch (driver side pressure location where the VDO was originally installed). The two original gauges immediately began to work again.

At idle with a cold engine, the original gauges read 65-73 psi. The mechanical read 85-87 psi.

No other tests were done. I need to run an hour or so to bring the original gauges down to zero.

At least it's in the right direction. The original gauges read lower than the mechanical. We'll see what happens when I do the long test.

Wish me luck that it's just a sensor issue and not a true zero pressure on my 46K mile engine.
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2007 Double Slide M380 "Bertie"
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  #88  
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hexspeed hexspeed is offline
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Quote:
Originally Posted by RVinCT View Post
At idle with a cold engine, the original gauges read 65-73 psi. The mechanical read 85-87 psi.
Just to keep the fuel flowing on this fire, the Cummins ISL manual shows a pressure relief valve in the oil pump assembly that is factory calibrated to open at 75 psi to regulate the maximum oil pressure flowing to the Main Lubricating Oil R!fle (intentionally misspelled to avoid filter)(see attachment).

Click image for larger version

Name:	ISL Oil Pump Diagram.jpg
Views:	14
Size:	192.5 KB
ID:	63629

Interested to see how long after start the mechanical gauge reads above the "max" level.

Glad the pressure is showing so healthy!! Sorry to add another wrinkle.

Jim
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2004 M380 SS
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  #89  
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my ISM reads 25 hot on factory gauge
its 55 on a manual gauge crazy


changed gauge and sender from vdo same low reading


got rv dash off ipad reads correct
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  #90  
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Quote:
Originally Posted by hexspeed View Post
Just to keep the fuel flowing on this fire, the Cummins ISL manual shows a pressure relief valve in the oil pump assembly that is factory calibrated to open at 75 psi to regulate the maximum oil pressure flowing to the Main Lubricating Oil R!fle (intentionally misspelled to avoid filter)(see attachment).

Attachment 63629

Interested to see how long after start the mechanical gauge reads above the "max" level.

Glad the pressure is showing so healthy!! Sorry to add another wrinkle.

Jim
Thanks for the image. What is that book? Do you have the title so I can find one to buy? Does Cummins sell it?

I've attached a modified image showing where the OP sensor is connected.

It's on the lower of the two bolt heads shown in the picture to the upper left. The black and white arrow points to it.
Attached Thumbnails
Click image for larger version

Name:	oil pressure sensor location.jpg
Views:	18
Size:	170.0 KB
ID:	63636  
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Todd and Karen Pattist
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2007 Double Slide M380 "Bertie"

Last edited by RVinCT; 4 Weeks Ago at 09:45 AM.
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