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Old 06-17-2015, 03:31 PM   #1
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Air filter?

Wondering if I should change the air filter on my 2004 Newmar mountain aire...(isl400).. I just purchased the unit and going through everything.. The filter gauge looks like it hasn't moved but not sure if the gauge is functioning either.... So the question is should I replace? If so where can I find a Eco filter..

Thank you

2004 Mountain Aire 4018
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Old 06-17-2015, 03:39 PM   #2
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eco filter is a donaldson filter google it and many suppliers will offer them
i would change it. if any of the paper element is ingested by the motor you will be spending much more than the cost of a filter

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Old 06-17-2015, 03:57 PM   #3
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I posted about changing the air filter on my Cummins ISL here and followed up with testing the air restriction gauge in the next post.
2003 Alpine Coach 40MDTS - 400HP Cummins ISL
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Old 06-17-2015, 03:58 PM   #4
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I agree with replacing the air filter, especially if you do not know the age.

Paper filters do degrade over time and reduce filtration performance, regardless of air filter minders (gauge). Water vapor in the inlet air is one the main culprits to degrade paper filters. My opinion.


EDIT: Just read Mikes post and link above; I beleive my comment above is similar to his "age of filter" concerns
Towr: 2007 Country Coach Allure 470 - 37 Sunset Bay Cummins 400 ISL
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Old 06-17-2015, 07:56 PM   #5
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Cummins says to follow the RV mfgr. recommendation for changing the air filter. That will be in your owners manual. Cummins also says every time the air ductwork is opened it increases the odds of leakage and introducing dust into the engine. They go on to say that the clamps must be re-installed in the same exact position on the rubber connecters or they will leak.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"
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Old 06-17-2015, 08:09 PM   #6
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The Eco & Ecolite filters were designed and manufactured by Farr which is now owned by Parker I believe. All the brands you see are all built in the same facility and private labeled so go for the best price.

These filters are seriously mediocre (yes, I have one too) and all the chassis builders love them because they can be plumbed to flow air in either direction. My next project is to replace with a fixed housing, disposable element air filter.

Steve Ownby
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Old 06-18-2015, 08:55 AM   #7
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I would change it, if for no other reason than to establish a baseline for the future. It may well be the filter was never changed, so get a fresh start.

The Farr Eco air filter on my ISL is only marginally capable of the engine's max air needs (just meets Cummins minimum spec), so even a small amount of dirt becomes a performance limitation on steep grades. Mine uses the FAR 094973-007.

By the way, the same Farr Eco filter is often available with different suffix numbers, e.g. the -007 above. That designates a different physical inlet/outlet shape for the same internal filter. You probably need the matching suffix number to properly mate up with the rest of your air plumbing.

Gary Brinck
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