Honda In Line Transmission Fluid Filter Flow Direction

[Old_Curmudgeon]

I have a 2001 Honda Odyssey. I want to retro fit it with a Honda In Line Transmission Filter like the 2011 -2017 models have from the factory. I plan to install it in the return line. However, the filters don’t have any indication of flow or input output! I believe that they have a bypass valve.
Can anyone tell me which end is which, using the seam for reference? Does it flow from the big end to the small end or from the small end to the big end?

The two images come from online research.

 

[Nukeman7]

If your 2nd photo is representative of the actual filter, the inlet side would be the end without the crimp seam (i.e., the part on the right side of photo 2). The debris in the fluid stream should deposit on the outside of the media pleats, just like an oil filter. I'm pretty sure there is no bypass relief valve.

 

[Old_Curmudgeon]

Thank you.

So the input line goes to what I am referring to as the "big end" as measured from the seam. The left end of photo 1 and the upper right of photo 2.

Photo 2 came from a 2007-2011 Honda CRV and has the same part # as photo #1, 25430-PLR-003.

​

 

[GMBoy]

From the service manual on a 2015 Odyssey maybe will help:

 

[Old_Curmudgeon]

Thanks GMBoy,

That is the filter. If I am correct, it is on a hose (C) connected to the fluid warmer. If you replace it, the new filter can only go into the holder one way so there is no possibility of installing it backwards. I, on the other hand, am retrofitting this filter into the return line of a 2001 Ody with a B7TA Transmission and there is no pre-existing filter holder.

What I need to know is which direction the fluid is going in Line C of your diagram. If Nukeman7 is correct (and I believe that he is) then the fluid should be flowing from the top of your diagram to the bottom. Entering the large end and flowing out of the small end.

I also found a photo of it on the rear driver side of a 2012 TSX Acura. Again, though, is the fluid flowing from the transmission or (I believe) to the transmission? I wish I had some better manuals that might tell me.

Thanks all for following this thread. I look forward to more replies.

Mike

 

[GMBoy]

Here is another photo that might be more of a reference for you in your retrofit:
(I do not know why they paste in such dark colors as they are all white background that I see)

 

[GMBoy]

 

[Old_Curmudgeon]

GMBoy, can you provide the model and year of the vehicle for that last diagram?

 

[Nukeman7]

GMBoy, can you provide the model and year of the vehicle for that last diagram?

It looks to be a 2015 Honda Odyssey, per the web search header.

 

[rkpatt]

FWIW- The real Honda OEM transmission filter on my 2007 crv has a bypass valve. Many (or most) of the aftermarket filters do not.

 

[GMBoy]

GMBoy, can you provide the model and year of the vehicle for that last diagram?

2015 Honda Odessy

 

[RF Overlord]

^^^what Nukeman7 said above^^^

The inlet is the "big" end.

 

[wlk]

FWIW- The real Honda OEM transmission filter on my 2007 crv has a bypass valve. Many (or most) of the aftermarket filters do not.

After researching when I did my filter, none of the aftermarkets have it and only the Honda brand does.Which is why I bought the Honda filter for mine.

 

[Sequoiasoon]

Factory Honda filter flow direction below. Yes, the Factory Honda has a bypass in it. On my '19 Pilot the fluid comes from top of tranny and returns to the bottom. If you want to try other filter the MagneFine filter fits in the bracket also. I have that in daughters CRV, and had in the Pilot.

You can see more pictures of the Magnefine in bracket as well as cut open factory filter with bypass in this thread on Piloteers. https://www.piloteers.org/threads/would-anyone-be-afraid-to-use-an-after-market-atf-filter.166556/page-5. I cant find those pics currently on my computer so will just do link to the thread.

 

[Sequoiasoon]

Thanks GMBoy,

That is the filter. If I am correct, it is on a hose (C) connected to the fluid warmer. If you replace it, the new filter can only go into the holder one way so there is no possibility of installing it backwards. I, on the other hand, am retrofitting this filter into the return line of a 2001 Ody with a B7TA Transmission and there is no pre-existing filter holder.

What I need to know is which direction the fluid is going in Line C of your diagram. If Nukeman7 is correct (and I believe that he is) then the fluid should be flowing from the top of your diagram to the bottom. Entering the large end and flowing out of the small end.

I also found a photo of it on the rear driver side of a 2012 TSX Acura. Again, though, is the fluid flowing from the transmission or (I believe) to the transmission? I wish I had some better manuals that might tell me.

View attachment 242127

Thanks all for following this thread. I look forward to more replies.

Mike

When I did mine originally and unsure of flow I took a piece of hose and put it into a gallon jug. I might have used 2 jugs, one for each hose IIRC to confirm. Start vehicle for a second and observe. Much more convenient if you have a helper to start and shut off vehicle.

 

[Old_Curmudgeon]

Thank you so much everyone for responding to my post. I was out of town for a week and was pleased at the answers and comments that came in while I was gone. I especially appreciate the photo that Sequoiasoon posted with the flow direction superimposed on the photo of the filter. Excellent! The Piloteers post is good reading. (But I get turned around by different vantage points. I will need to re-read and digest it. The photos are great.)

With any luck I will install one on my return line tomorrow with the big end towards the cooler and buckle everything back up. I am hoping with 3 or 4 drain & fills plus new filters at fluid change I will dramatically extend the life of my transmission. I sure hope that I still have most of my friction material!