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11-26-2017, 04:07 PM
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#1
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Member
Join Date: Oct 2017
Location: Northeast Georgia
Posts: 46
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Oil Pressure Gauge, Turbo Boost Gauge not working
Hi,
Making progress on shooting bugs in the 1999 Monaco Exec. Found a good tech who will come on site . Two bugs that are lower priority (one lower, one still high) are that there is no gauge reading on oil pressure or turbo boost. This is a Cummins 450. I really hate not knowing oil pressure, turbo boost is a "nice to know" but since I've never owned a turbo before, don't know what the right values would be anyway. As I remember, the gauges on our Schneider 9700 Cabover did not even have a boost gauge at all. The L10 engine had so little grunt it did not matter that we were governed to 55 MPH.
I have the wiring diagrams but the location of the senders specified does not seem to match reality. Does anyone have photos of these two elusive guys? Of course, the gauges may be bad but it seems to make sense to check first for missing wires, or oddly, the manual says the turbo boost uses yellow clear plastic tubing. I have pretty decent access to top of engine thru bedroom but maybe they are lower on block. Turbo sender is supposed to be on intake manifold, oil sender on P/S rear of engine.
Totally unrelated question: see lots of references to "Salesman Switch" in the forum. What is that? Legends are worn off all my switches, will be a big task to come up with labels for them when I figure out what they do.
__________________
Harry and Elaine and whichever pup we are raising for Canine Companions for Independence.
1999 Monaco Executive 40', Cummins M11 450HP; 1998 Bounder 36S, Ford 460 Until she sells.
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11-26-2017, 05:43 PM
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#2
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Senior Member
Monaco Owners Club
Join Date: Nov 2016
Posts: 216
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My oil pressure and coolant temp gauges are not reliable so I bought Scangauge D. Best 180 bucks I’ve spent! Took all of 15 minutes to set up!
The salesman switch is a toggle switch on my 1999 Dynasty at the door that completely turns off the power to the coach.
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Scotia, Tricia, Mia, (the Labradoodle)
1999 Monaco Dynasty
330hp Cummins, Allison 6 speed
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11-26-2017, 05:51 PM
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#3
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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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Doubtful that you have a boost gauge on the dash. To read mine I have to use the SilverLeaf 400Cl. On my last MH I had to use a SilverLeaf VMSpc.
__________________
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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11-26-2017, 07:45 PM
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#4
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Senior Member
Monaco Owners Club
Join Date: Oct 2009
Location: Tucson, AZ
Posts: 6,062
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Just fixed my oil pressure gauge. My gauge uses a VDO number 360 023 sending unit that is located just above the starter on the passenger side of the engine. This is a very common sending unit used on lots of applications.
My owners manual lists a Monaco version of the sending unit that is no longer available:
VDO 360 0238NDO
Just a note: There are 2 sending units on most Cummins engines installed in Monaco coaches, one for the engine ECU and one for the gauge. The gauge sending unit has 2 connections, one for the light and one for the gauge.
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97 Monaco Windsor- Sold
07 Monaco Executive McKinley- Sold
04 Monaco Signature Chateau IV
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11-27-2017, 10:55 AM
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#5
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Member
Join Date: Oct 2017
Location: Northeast Georgia
Posts: 46
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Oil Press and Boost answers
Scotialaddie - thanks for tip on Scangauge D. Looks like a great product from their website, I was looking a while back for comparable info product for my Acura MDX when I had trans fluid overheat - but found that the data wasn't available from the Acura interface. Bummer. Looks like putting the Scangauge on might be cheaper in long run than fixing these two gauges.
Mr D - Why are you doubtful that the Monaco has a boost gauge on the dash? It is there big as life and is referenced in the gauges wiring diagrams.
Thanks to all who responded to this inquiry.
__________________
Harry and Elaine and whichever pup we are raising for Canine Companions for Independence.
1999 Monaco Executive 40', Cummins M11 450HP; 1998 Bounder 36S, Ford 460 Until she sells.
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11-27-2017, 11:00 AM
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#6
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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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Quote:
Originally Posted by xbigblue
Scotialaddie
Mr D - Why are you doubtful that the Monaco has a boost gauge on the dash? It is there big as life and is referenced in the gauges wiring diagrams.
Thanks to all who responded to this inquiry.
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That's because very few MH's come with a boost gauge and you have to add it.
You're welcome!
__________________
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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11-27-2017, 12:18 PM
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#7
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Member
Join Date: Oct 2017
Location: Northeast Georgia
Posts: 46
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The Scangauge D
Thanks again for the Scangauge D recommendation. I found it online at Advance Auto Parts at $159, with a special deal today of $40 credit for online purchase, net 119 bucks. Whattadeal!
__________________
Harry and Elaine and whichever pup we are raising for Canine Companions for Independence.
1999 Monaco Executive 40', Cummins M11 450HP; 1998 Bounder 36S, Ford 460 Until she sells.
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11-27-2017, 12:25 PM
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#8
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,282
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Quote:
Originally Posted by Mr_D
That's because very few MH's come with a boost gauge and you have to add it.
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Hmmm, mine has one
__________________
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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11-27-2017, 04:23 PM
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#9
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Senior Member
Monaco Owners Club
Join Date: Sep 2003
Location: Quitman MS
Posts: 2,967
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Quote:
Originally Posted by Mr_D
That's because very few MH's come with a boost gauge and you have to add it.
You're welcome!
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I think all diesel engine Monaco coaches from the early 90 to the 2008 had a boost gauge.
Bigblue your boost gauge on your ISM engine will be a 1/4 plastic tubin hooked in somewhere close to your turbo on the air intake manifold. They get close to the exhaust manifold and get burned into somtimes.
__________________
Walt & Will
2000 Dynasty
2017 Ram Big Horn Crew C 4X4 w/ M&G
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11-29-2017, 12:14 PM
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#10
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Senior Member
Join Date: Oct 2013
Posts: 239
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The boost gauge is mechanical - yellow tubing all the way from the intake manifold to the gauge, I agree with Walt it is likely to be damaged near the connection at the intake. There is also a sending unit for the ECM as I read boost with the Silverleaf VMSPC as well. My oil pressure gauge isn't working either - believe its the sender - I've gotten lazy and haven't run it down since I can read it on the VMSPC....
__________________
99 Executive 38 M11 450
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