Diesel air intake tube drain clogged?

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Joined
Nov 2, 2019
Messages
2,180
Location
WA, MT or somewhere else!
RV Year
2018
RV Make
Newmar
RV Model
Mountain Aire 4047
RV Length
40'
TOW/TOAD
2014 Honda CR-V
In a recent thread on another RV forum, it was pointed out that in some cases, Newmar has covered the bottom end of the engine air intake tube drain (the "duckbill") with insulating foam, preventing proper drainage. In at least one case, some major engine damage apparently resulted from a blocked drain.

I checked our coach yesterday, but couldn't find any evidence of a drain tube. After getting some tips on where specifically to focus my examination, I found the drain tube. It had been totally foamed over. Whether this would have prevented the drain from working properly, I can't say, but I think it certainly had the potential to do so.

I removed enough foam to fully expose the lower end of the drain "duckbill" and probed inside with a smooth, flat stick to ensure that it was open and would drain properly. So far, the confirmed cases of foamed-over drain have occurred on coaches with the Spartan K3 chassis (LADP and MADP), but I recommend that all Newmar owners verify that their drain is uncovered and working properly.

TJ
 
Joined
Jul 27, 2019
Messages
3,419
Location
Midlothian, VA
RV Year
2017
RV Make
Newmar
RV Model
Ventana 4037
RV Length
40' 10"
TOW/TOAD
2017 Chevy Colorado
Thanks for the reminder. I need to go see if I can even access that area. May not be visible in the rear radiator setup.
 
Joined
Nov 2, 2019
Messages
2,180
Location
WA, MT or somewhere else!
RV Year
2018
RV Make
Newmar
RV Model
Mountain Aire 4047
RV Length
40'
TOW/TOAD
2014 Honda CR-V
A couple of cellphone photos (with flash) is a good place to start. I also used a 4x5 hand mirror and flashlight to finally find mine.

TJ
 
Joined
Nov 4, 2019
Messages
573
Location
No Where In Particular
RV Year
2020
RV Make
Newmar
RV Model
Dutch Star 4369
RV Length
43’ 9”
TOW/TOAD
2016 Colorado
Found ours and all was clear. I was surprised to learn that both rear roof drains are routed to the passenger side.
 
Joined
Nov 2, 2019
Messages
2,180
Location
WA, MT or somewhere else!
RV Year
2018
RV Make
Newmar
RV Model
Mountain Aire 4047
RV Length
40'
TOW/TOAD
2014 Honda CR-V
Anybody know what kind of foam Newmar uses and whether it can be purchased in a spray can? Being something of a "neatness freak," I would like to touch up a couple of areas where I removed foam while looking for and exposing the drain.

TJ
 
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