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Old 06-17-2011, 01:10 PM   #15
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Dont think overall dimensions of the filter are as important AS LONG AS the filter fits inside the confines of the canister. What is of critical importances is that the opening at the end of the filter fits over the alignment cone at the back of the canister and creates/allows a good seal between the filter and the canister wall. If you try to use a 400 filter on a 350--it will probably work ok [trust but verify]--you may already have a 400 filter in yr 350 and dont realize it. Howerver, you cannot use the smaller opening 350 filter on a 400--a gap will occur and you will dust yr engine.
NOT good advice. In checking our database on these two filters and housings (Nelson). Making one "fit" is the ticket to dusting. Both filters have a specific housing.

AF25548 uses the AH19079 (Fleetguard) housing. Quick check of the inlet and outlet connections diameter will confirm this housing: both inlet and outlet are 6 inches OD.

AF25549 uses the AH19080 housing. The inlet (round end) is 6 inches. The outlet (side of housing) is 7 inches.

If there ever is a need for a warranty claim, use of the incorrect filter in a housing regardless of a manufacturing defect will void warranty.

The Cummins/Fleetguard Guy,
Gary
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Old 06-17-2011, 01:21 PM   #16
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OK-OK--this isnt rocket science [with all due respect to Basil]. If yr filter canister has a 6 inch opening [alignment cone] in the back, you must use a filter with a 6 inch opening. Same can be said for a 7 inch opening and cone. The most obvious problem occurs when you try to use a 6 inch filter opening on a 7 inch cone. Ideally, you dont want to use a 7 inch filter opening on a 6 inch cone but suspect you can get an effective seal by holding the filter inplace as you tighten the wing-nut. Not sure this last part is "bad advice," just not the "best advice"......

PS -- where does one find the canister part number?
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Old 06-19-2011, 02:42 PM   #17
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OK-OK--this isnt rocket science [with all due respect to Basil]. If yr filter canister has a 6 inch opening [alignment cone] in the back, you must use a filter with a 6 inch opening. Same can be said for a 7 inch opening and cone. The most obvious problem occurs when you try to use a 6 inch filter opening on a 7 inch cone. Ideally, you dont want to use a 7 inch filter opening on a 6 inch cone but suspect you can get an effective seal by holding the filter inplace as you tighten the wing-nut. Not sure this last part is "bad advice," just not the "best advice"......

PS -- where does one find the canister part number?
I think your best bet on the air housing is to contact your manufacturer. Problem is that they change housings and may not have a clue when they did it. I would hope the chassis builder had a 'line sheet' that indicated the components in the build. Air housing would be one of them.

If you were referring to putting a 7"onto a 6" cone, still it could be problematic. I hate to say it but the Fleetguard paper catalogs and downloadable PDF catalogs have a section called "Air Filter by Dimension"....if it fits use it is what they are offering. BAD ADVICE even from us. Some air filters fit into the housing but leave no real space around them to allow sufficient air flow to reach all the pleats. Then you air cleaner suddenly is very small and has very low air flow ability.

Most OE air cleaner housings with replaceable elements are made by Donaldson. Some made by Nelson. Send me any pix of your air cleaner housing and element and I will do some digging. No guarantees that what I find will be accurate. I do have Donaldson paper catalog which has some good housing pix.
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