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Old 12-19-2013, 07:58 AM   #1
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Diesel Pushers?

Thinking about upgrading my 36 ft. Work Horse to a diesel pusher, used Monaco or Newmar 36 to 40 ft.2004 to2006 with at least 400 cummins any body have thoughts,or preference on make or model,and powertrain ????
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Old 12-19-2013, 09:46 AM   #2
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Do your homework on the chassis certain Monaco roadmasters had trailing arm problems $$$$.
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Old 12-19-2013, 10:03 AM   #3
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Don't forget to ask questions in the Monaco and Newmar forums.
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Old 12-19-2013, 10:22 AM   #4
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Some 2005-2006 ISLs had wrist pin issues but I believe it is easily verified.

ISL wrist pin defect serial number range
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Old 12-19-2013, 10:32 AM   #5
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Are you locked in on just Monaco and Newmar? There are plenty of others out there that fall into your short list of requirements.

Remember that Monaco also built Holiday Rambler, Beaver, and Safari of the years you mentioned and with any of those models you can get an almost twin with the other three. And yes, all four of these brands had a problem with the trailing arms on the coaches with the Roadmaster R4RR chassis that had the trailing arms that were mounted below the rear axle. If interested in one of these, make sure the arms have been replaced with the Source Engineering arms.

Newmar, Tiffin, Country Coach, Winnebago, Fleetwood..... the list is pretty much endless and all are almost the same...not a whole of of difference. Floor plans from each can be found on other brands and engines are, for the most part, limited to either Cummins or Cat and both are excellent engines.

For each brand, it will have models that range from entry level to luxury level and the consensus here is to shop for a higher level of coach in earlier years....all depends upon what you are looking for and how much you can afford.

Go to dealerships, rv rallys, and research here on line.

Good luck.

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Old 12-19-2013, 10:57 AM   #6
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As said above, if you are not locked in to a Monaco there are many other high end quality built coaches available. You could then add Country Coach and Travel Supreme to your list along with Monaco, Holiday Rambler, and any others you choose. Good luck shopping, as there are many clean units available.
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Old 12-19-2013, 11:38 AM   #7
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As said several time there are other quality MH out there for those years. Nor would I limit my self to 400 HP on a 36 foot MH. A 350 on that size chassis would be sufficient. If a coach fits all of your other wants and needs don't discard it just because it doesn't have 400HP.
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Old 12-19-2013, 11:44 AM   #8
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You won't find a Cummins 400 ISL on any R4R chassis, so the trailing arm issue won't apply if the 400 is a firm requirement.

Read here about which chassis/coach models had this defect:
http://www.rv-chassis.com/RoadmasterR4R_FMC1109.pdf

I wouldn't make the 400 Cummins a hard requirement until I had a better idea of what coach I liked best. There are darn few (if any) 36 footers with the ISL engine and many 40's don't have it either, cause they often don't need it for good performance. The Cummins ISC was very popular in the years and sizes you are talking about, and its a fne engine as long as the coach is in its weight range (and most in the 36-40 bracket are).

By the way, the Cummins 400 ISL is available in 370, 400, and 425 hp versions in the years you are considering. The ISC in those years tops out at 350 hp, I think
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Old 12-19-2013, 01:44 PM   #9
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Old 12-19-2013, 02:03 PM   #10
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Off the thread a bit but what is the difference between the ISL and ISC engines. While I'm at it, what the heck does each stand for?
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Old 12-19-2013, 02:13 PM   #11
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After owning a Newmar, I'd have a hard time switching to anything else. The 370 ISL pulled me pretty much effortlessly up every mountain pass I asked it to this summer going from Texas through Colorado, Wyoming and up to Glacier Nat'l Park.
The longer I have it, the more I appreciate the quality of the Spartan chassis along with the construction of the coach, insulation properties and all the amenities.
I haven't any experience with a Monaco, so I can't say if it's better or not as nice as a Newmar.
You can go to Newmar's website and pull up the brochure for any year coach you're interested in to see the construction data, standard/optional equipment, etc.
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Old 12-19-2013, 03:01 PM   #12
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not sure how reliable this is but I found it at...

http://www.justanswer.com/rv-motorho...-coach-rv.html


Engine Series

IS = Interact System (i.e. ISX, ISB)
Q/QS = Signifies that an industrial engine is electronically controlled. QS stands for QUANTUM SYSTEM CONTROLS
B = B series engine line, includes 3.3 , 3.9, 4.5 and 5.9 liter engines. Offered in both fully mechanical and electronic models. 5.9 liter engine is available in both industrial and automotive versions.
C = C series engine line, includes only 8.3 liter engines. Offered in both fully mechanical and electronic models, industrial and automotive versions available.
E = On older engine models this meant the engine was electronic. EXAMPLE: K2000E
K = K series engine line, includes 19, 23, 38, 45, 50 and 60 liter engine models.
L = L series engine line, includes older 10 liter and current 9 liter engine models. Industrial and automotive versions available.
M = M series engine line, includes M11, 11liter engines only. Industrial and automotive versions available.
N = N series engine line, no longer being produced for U.S. market. Included NTA855 and N14 engine series. Industrial and automotive versions available.
T = T series engine line such as the QST30.
X = X series engine line, includes 15 liter engines only. Industrial and automotive versions available.
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Old 12-19-2013, 04:08 PM   #13
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Hi vincee,
The only difference between the L and C engines is the length of the piston stroke. Basically, everything else is the same.
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Old 12-19-2013, 04:28 PM   #14
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Yes, but that longer stroke gives it more horsepower, torque and cubic inches.
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