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Old 11-30-2020, 04:11 PM   #1
3x5
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Engine air filter

We have a 2005 Alpine Coach 36FDDS with a 8.9 liter ISL 400 hp CM850 engine. The 2005 WRV manual states at page 86 that the air filter is a Fleetguard part number AS25549. (It states "AS" but I think it should be "AF.") I don't trust this manual, and I have heard that there is a similar filter number for the 350 hp engine that will fit, but not seal.


I called Cummins, and they say they don't have a number, and that I have to call the manufacturer, who of course is long gone.


Can anyone verify the filter number?
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Old 11-30-2020, 04:19 PM   #2
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I would pull the old filter out and see if there is any identification on it. I would also take pictures and measure inlet/outlet , diameter, and length.



In my case the filter and canister are made as a complete filter. When I replaced my filter early this year I checked the web and found the best price at Filter Barn. The one thing that I wanted to confirm was that there was a wire mesh on both inside and outside of the filter media. I had read several accounts where a filter failed and didn't have the wire mesh.
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Old 11-30-2020, 05:43 PM   #3
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AF is correct.
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Old 11-30-2020, 07:14 PM   #4
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Yup--what RVP said...correct air filter for 400ISL is AF25549.....
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Old 11-30-2020, 07:22 PM   #5
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Quote:
Originally Posted by Old Scout View Post
Yup--what RVP said...correct air filter for 400ISL is AF25549.....
Thisis also the same Air Filter used on my 2001 350ISC as well!

Cross Reference:

Baldwin PA3499
Donaldson P776157
Fleetguard AF25549
Napa 6904
WIX 46904
K&N 38-2033S
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Old 11-30-2020, 07:50 PM   #6
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Donít use a K&N (on your Alpine)!
Previous owners of our coach ďdustedĒ the engine with a K&N air filter requiring a very expensive rebuild. That said, Iíve had a K&N filter on our truck for 29 years!
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Old 12-01-2020, 01:00 AM   #7
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2004 400hp 8.9L

Motorhome Air Fleet Guard Af25549. Napa 6904
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Old 12-01-2020, 07:47 AM   #8
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...since curious minds really want to know more about our air filters....shortly after the 400ISL came to our Alpines, there was a potential problem with air filters....as I understand it, the original filter for a 350 was a AF2554[8]. The opening on this filter was slightly smaller than the 400 air filter.....so if you used a the 350 filter on a 400, the smaller opening hung up on the alignment cone at the rear of the canister and didn't allow the filter to seal to the canister....the likely result was a dusted 400....to the contrary, a 400 filter on a 350 was/is probably ok?????
OR....I am old and really don't remember.....
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Old 12-01-2020, 11:20 AM   #9
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Everyone, thanks for the confirmations and the cross-references. Where do you recommend I get one?


I can't find it on Cummins Parts online. I called Cummins and they said they are $129.16.



Amazon has the Cummins AF25549 for $159.02 ($121.89 + $37.13) by Farm Parts Store, but usually ships in 1 to 3 weeks!


I called two NAPA auto parts. They cross to the NAPA 6904 made by WIX. One wanted $196.01. The other wanted $150.99.



And I thought Cummins was high!
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Old 12-01-2020, 11:22 AM   #10
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Quote:
Originally Posted by Old Scout View Post
...since curious minds really want to know more about our air filters....shortly after the 400ISL came to our Alpines, there was a potential problem with air filters....as I understand it, the original filter for a 350 was a AF2554[8]. The opening on this filter was slightly smaller than the 400 air filter.....so if you used a the 350 filter on a 400, the smaller opening hung up on the alignment cone at the rear of the canister and didn't allow the filter to seal to the canister....the likely result was a dusted 400....to the contrary, a 400 filter on a 350 was/is probably ok?????
OR....I am old and really don't remember.....



Scary!
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Old 12-01-2020, 11:33 AM   #11
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Quote:
Originally Posted by 3x5 View Post
Everyone, thanks for the confirmations and the cross-references. Where do you recommend I get one?


I can't find it on Cummins Parts online. I called Cummins and they said they are $129.16.



Amazon has the Cummins AF25549 for $159.02 ($121.89 + $37.13) by Farm Parts Store, but usually ships in 1 to 3 weeks!


I called two NAPA auto parts. They cross to the NAPA 6904 made by WIX. One wanted $196.01. The other wanted $150.99.



And I thought Cummins was high!
Iíve always gotten them from Cummins. The Cummins Power Club dropped the annual membership fee this year. If you join, they will send out emails several times each year with discount offers. Typically, 15-25% off.
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Old 12-01-2020, 11:39 AM   #12
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Agree with RVP--guess not all Cummins shops are the same but I have found prices to be pretty good at my local Cummins here in San Antonio....
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Old 12-01-2020, 04:07 PM   #13
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I buy my filters from Simply Filter. They show the above Fleetguard OEM filter for $ 101. with free freight. Check them out. They also carry Nelson Mufflers. I purchased the original style Nelson / Alpine muffler from them. It is the same OEM model that has the same baffles and sound. Delivery is very quick as well.
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Old 12-01-2020, 04:16 PM   #14
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Quote:
Originally Posted by Bruce Anthon View Post
I buy my filters from Simply Filter. They show the above Fleetguard OEM filter for $ 101. with free freight. Check them out. They also carry Nelson Mufflers. I purchased the original style Nelson / Alpine muffler from them. It is the same OEM model that has the same baffles and sound. Delivery is very quick as well.



Bruce, thanks. That looks good.
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