What is this Part? [Determined to be duckbill for air cleaner]

Topic: What is this Part? [Determined to be duckbill for air cleaner] (Read 1546 times) previous topic - next topic

What is this Part? [Determined to be duckbill for air cleaner]

September 18, 2016, 08:34:38 pm

I found this rubber part under the rig. At first, I thought it might have come off of the air dryer but I don't see where. It looks like it might be designed to allow air to pass out while keeping dust and water on the outside. Thanks.
jor

[edited topic title to reflect answer and help future search - Michelle

Re: What is this Part?

Reply #1 – September 18, 2016, 08:36:50 pm

That is the duck bill that goes in a hole in the bottom of the air cleaner.

Re: What is this Part?

Reply #2 – September 18, 2016, 08:49:26 pm

Correct.

Most parts houses that cater to the OTR truck trade will have them.

You may be able to refit it, but if the rubber has hardened, better to replace it.

More info if Donaldson brand: http://www.donaldsonoemfiltration.com/library/files/documents/pdfs/055477.pdf

Re: What is this Part?

Reply #3 – September 18, 2016, 10:29:12 pm

Duckbill is correct. Yours looks to be in pretty good shape. You should be able to just pop it back in place in the air filter housing.

see ya
ken

Re: What is this Part?

Reply #4 – September 19, 2016, 10:29:06 am

On our '95, the Vacuator is/was on clean air side (after the filter) of the filter housing. Any dust sucked in through it goes directly to the turbo. I removed it and covered the hole with heavy foil tape.

Re: What is this Part?

Reply #5 – September 19, 2016, 10:36:11 am

Quote from: Dave Larsen – September 19, 2016, 10:29:06 am

On our '95, the Vacuator is/was on clean air side (after the filter) of the filter housing. Any dust sucked in through it goes directly to the turbo. I removed it and covered the hole with heavy foil tape.

Dave,

So, do you have a water drain (Vacuator) on the suction side of the air filter-- either on the housing or in the ducting to it???

Sounds like you have a "reverse flow" air cleaner-- dirty air in the center, clean out the perimeter of the filter. If so, make sure you have the "reverse flow" air filter element. They have dark stripes on the outside of the filter element. The filter shape is the same as for normal flow, but layers are reversed-- this is important.

Re: What is this Part?

Reply #6 – September 19, 2016, 10:38:49 am

On that model fot put out a quiet recall on removing this part, had a few engines damaged.

Re: What is this Part?

Reply #7 – September 19, 2016, 10:43:58 am

George,

Additional information would be appreciated. Was this just on the 1994 and 1995 U240, or were there other models with reverse flow air cleaners???

Re: What is this Part?

Reply #8 – September 19, 2016, 11:32:13 am

Brett,
yes there is another vacuator on the box up behind the cabinet in the bedroom.
It is the reverse flow filter and I do use the correct filter.

Re: What is this Part?

Reply #9 – September 19, 2016, 12:19:53 pm

Our '93 U280 sucks the dirty air into the middle of the conical filter, then it goes out the sides of the filter to the engine. I never knew you needed different filters depending on which way the wind blows. Thanks a bunch, guys, now I have to go pull out my brand new air filter and check it.

If it is the "wrong" kind of filter, I will be pis.........irritated.

Also will see if I have a "duck bill". If so, it will be removed.

Re: What is this Part?

Reply #10 – September 19, 2016, 12:47:19 pm

Wolf 10, the only ones I saw, was on 8.3 Cummings on a Alaskan motorcade, inhaled enough dust to required an inframe overhaul, there were 2.

Re: What is this Part?

Reply #11 – September 19, 2016, 03:23:45 pm

From Donaldson pdf comparing standard flow vs reverse flow-- replaceable elements:

Standard flow= Air IN to OUTSIDE of the filter. Air OUT in CENTER of filter. Vacuator to allow water out since it on the "dirty side" of the filter.
Reverse flow= Air IN to CENTER of filter. Air OUT to OUTSIDE of filter. Vacuator, IF PRESENT WOULD BE ON CLEAN SIDE OF FILTER AND WOULD ALLOW DIRT INTO THE ENGINE!!!! PLUG IT. Also insure that there is some way for water coming in from the side of the coach to exit before the filter element.

These filters look exactly the same
except there are dark lines viewable
on the filter media of one of the filters.
What's different? One is a standard
flow filter, the other reverse flow.
They fit housings that have specific
flow requirements and are not
interchangeable even thought they look
like they could be.

Re: What is this Part?

Reply #12 – September 19, 2016, 06:04:45 pm

Quote from: wolfe10 – September 19, 2016, 03:23:45 pm

From Donaldson pdf comparing standard flow vs reverse flow-- replaceable elements:

Can you please supply the link to the Donaldson .pdf?

Re: What is this Part?

Reply #13 – September 19, 2016, 06:15:50 pm

http://www.donaldson.com/content/dam/donaldson/engine-hydraulics-bulk/catalogs/air-intake/north-america/F110027-ENG/Air-Intake-Systems-Product-Guide.pdf

Page 14 for the discussion of straight vs reverse flow air cleaner designs.

Re: What is this Part? [Determined to be duckbill for air cleaner]

Reply #14 – September 19, 2016, 06:49:11 pm

Thanks, Brett!

This subject of reverse flow air filters is a new one on me. I didn't realize there were two kinds of air filters. Beamalarm.com lists two air filters for our coach: Fleetguard AF954M and Donaldson P12-9396. The Foretravel chassis manual that came with our coach from the factory specifies the same two air filters. The PO of our coach used the AF954M, and I have also used it for the last 3 years.

SO, after reading the discussion (above) about filters, I went out and pulled the brand new AF954M out of our coach. Guess what? It does have the black lines on the outside of the filter, which is the clean air side the way it is fitted in our coach. So, I guess we are safe using this filter.

If I do a Google search for either of those filters, and look at every listing from every supplier, not one of them (that I found) specifies whether the filter is standard or reverse flow. The suppliers could do a lot better job at providing that info.

The link given above by Brett leads to a EXCELLENT catalog for the Donaldson filters. You can find everything you ever wanted to know about their product - kudos to whoever wrote it.

Page 14 (as mentioned by Brett), and pages 63, 64, and 65 will be of particular interest to all the Unihome owners who have the same "driver rear side entry" filter housing as found on our coach.

Cummins (Fleetguard), in comparison, gives very little info at their filtration web site. It's like pulling teeth trying to find out anything more than the simple physical size of a particular filter. Pretty shoddy online effort.

Products Overview | Cummins Filtration

Re: What is this Part? [Determined to be duckbill for air cleaner]

Reply #15 – September 19, 2016, 07:04:10 pm

I also checked our filter housing for a "duck bill". There is a hole in the bottom of the filter canister, about 2/3 of the way to the back, probably about 3/4" diameter or so. It has a rubber/metal expanding type plug in it, kinda like a freeze plug for a engine block. Looks like it has been there for a long time. If our housing ever did have a "duck bill" in that hole, it was removed long ago. But certainly something you should check if you have this type air filter arrangement.

Re: What is this Part? [Determined to be duckbill for air cleaner]

Reply #16 – September 19, 2016, 08:23:41 pm

Got the duck bill on the air dryer vent. Had to really stretch and push it to go over the vent. Doesn't really look like a good fit. I wonder if it had a retainer clip on it or something. Anyhow, here's a photo. I added a hose clamp (not shown) to keep it from blowing off. I intend to replace the entire air dryer as I suspect that it has years on it. Its had the canister replaced but the bottom end it pretty caked up with grime.
jor

Re: What is this Part? [Determined to be duckbill for air cleaner]

Reply #17 – September 19, 2016, 08:31:10 pm

Jor, I thought they were talking about that D Bill drain going on the "air filter" housing NOT the air dryer. Mine has it on the lower base of filter housing--nothing on the dryer needed IIRC??
If you had lots of trouble getting it in place there then I guess it was not meant for it!!
JohnH

Re: What is this Part? [Determined to be duckbill for air cleaner]

Reply #18 – September 19, 2016, 09:25:50 pm

Correct. JOR, check the air FILTER for the missing part.

While a duck bill may fit on the air dryer purge outlet, a 6" piece of hose will do a very good job of keeping dirt and water out, but not restricting air flow.

BTW, your air dryer does not look like it has been serviced in a VERY long time.

Re: What is this Part? [Determined to be duckbill for air cleaner]

Reply #19 – September 25, 2016, 09:54:37 pm

Quote

BTW, your air dryer does not look like it has been serviced in a VERY long time.

Yea, that's for sure. This baby has had consistent basic mechanical service (fluids, filters and belts) but almost nothing else.
jor

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