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Old 06-04-2011, 11:48 AM   #1
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RJay's Avatar
Newmar Owners Club
Join Date: Jan 2010
Posts: 4,589
Changed ISL Air Filter

I decided to change my air filter on the 400 ISL today. As you can see from my signature, the coach is 4 years old and has only 8600 miles. The air filter is the original and the vacuum gauge still shows plenty of life left but I just didn't want to take the chance of the paper element disintegrating due to age and being suck into the engine.

I picked up the filter(part number AH8501) from Cummins South Plains in Austin, TX yesterday and with taxes, out the door, was $142.56. Since the weather forecast for today is supposed to be in the mid 90's I decided I'd get an early start. The filter canister is held in place with two retaining straps with four feet thru which bolts hold it to a flat piece of metal. The air inlet side is on one end and the outlet forms an offset “T” to the canister.

I decided to loosen the bolts holding the feet of the retaining straps so I could have some movement when it came time to slide the canister out of the rubber sleeves connecting the air inlet and outlet. For some reason the bolts were put down thru the bolts holes which made removing them difficult because of the way the feet were constructed. When I put them back I reversed them putting the bolts up from the bottom an just sliding the nut on the foot, much easier for the next change.

Next was to loosen the clamps holding the two rubber sleeves to the filter inlet and outlet. There was about 2” of thread extending beyond the nut and since I didn't have a deep well socket I had to wrench it loose a quarter of a turn at a time. Making matter worst was the clamp was put at such an angle that I couldn't see the nut. When I put the clamps back on I arranged them to be more accessible for the next time.

Putting the new canister in took about half the time since I just reversed the process. Fitting the inlet and outlet nipples into the rubber sleeves was a little tedious but I found that if they are finessed in rather than push in by brute force they go in easier and quicker. Total time to change the filter and clean up was about an hour and a half.

When I checked the condition of the filter, the first thing I noticed was a gob of spray insulation on the inlet (dirty side) of the filter. It couldn't do any damage where it was and must have fallen down from where it is attached further up and out of sight. The inlet side was gray, which was expected, and the outlet still white but I didn't see any signs of deterioration of the filter element itself. I still feel better that it's changed.

2007 Newmar DSDP 4023
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Old 06-04-2011, 12:18 PM   #2
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Thanks RJay... great stuff. Funny how they build these things like they're never going to have to be worked on.


Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.

2007 Itasca Ellipse 40FD
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Old 06-04-2011, 02:57 PM   #3
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I am not sure how long you have had the coach.... but I think it time you start putting some miles on it so the engine can break in. The poor thing is starved for attention and the run of the road...

New campaign...

... have you hugged your engine today?
Monaco 2005 Dynasty & Arctic Fox 996
FullTimers with Cats: Zippy & Sami (RIP)
Honda CR-V chases us everywhere we go!
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Old 06-04-2011, 08:48 PM   #4
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I, to, changed my air filter recently because of time, not that the gauge showed any stoppage. It was a bear, mostly because the change had to be done from underneath and various braces were in the way and had to be removed and replaced. Hope this one lasts a long time.

JT Kirby
2006 32T Journey
2010 Chevy Malibu toad
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Old 06-04-2011, 11:14 PM   #5
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OP, from your description I guessed you had a Newmar, then I looked at your sig!

Sounds exactly like our 2002 DSDP 4090. Id' like to go to a bigger filter and inlet tubing as a new filter shows 15 on the gauge right after changing. The Banks kit (new turbo housing) must take a LOT more air.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
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Old 06-08-2011, 10:19 PM   #6
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Just changed our 8.3 Cummins yesterday. AH8503 is the type. It wasn't too bad... found out the easiest way to get it out was to loosen both clamps on the outlet sleeve from the air filter to the engine. That allowed me to slide the rubber sleeve far enough away so I could pull the filter out through the bedroom side. I tried to first remove with just the 2 clamps loosened (inlet/outlet)..... too much of a struggle to clear the side outlet port of the air filter..... loosening and sliding the outlet sleeve to engine clamps made it really easy... just slide that entire rubber sleeve away from the filter outlet and you suddenly have plenty of clearance!
Course, the DW had to help.... watch out for electric connectors... bunch right next to the front area of the metal filter housing... don't let them touch!!!! Sparks will probably fly!
Bernie & Karen https://www.RV-Insight.com
Full Timers - SD Tags - USA
2000 Monaco Windsor 38' Diesel Pusher w/Toyo 4WD
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Old 06-10-2011, 05:49 PM   #7
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Just a little more experience, and we'll let you try a 2005 Dodge Durango with a 5.7 Hemi, spark plug change. M/H manufacturers don't hold the patent on hard to work on .
Anyhow 99DSDP 38' Cat, air filter , lift the bed, 5/16" socket on a cordless drill, 5 min re&re. Took longer to vacuum the bedroom than change the filter.
RJ, get off the computor and out on the road, I put on more miles than that the first month I owned my coach.

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