auxiliary transmission filter

[1skatingrin]

does anyone know where i can get a replacement micromax transmission filter?its surpose to filter down to five microns.The original company has gone out of bussiness.I have heard that i could use a regular oil filter that fits the mounting block,but that only filters down to twenty microns.thanks for any replies. Bill

[Gary RVRoamer]

There are fuel filters that will do 5 microns - or even less - but I suspect the flow rate is pretty low. What kind of flow goes through this filter? I'm guessing it is a bypass filter of some sort?

And are you sure you need it? Is this an older tranny? Most Allisons come with more than adequate filtering.

[1skatingrin]

thanks for the reply Gary.This filter is in cooling line so its full flow.My transmission is ford 1994 f53 .Never had any proplems with it 82000 miles.I change fluid and internal filter every 15 to 20 thousand,draining all fluid from converter.

[Gary RVRoamer]

I have no idea what GPM is needed for a tranny cooling line. Guess you could disconnect and see how much pumps into a bucket in a minute?

Changing the fluid and internal filter every 20k miles ought to make an external filter redundant. Is that the E4OD tranny? It's pretty robust, as was its predecessor.

Here is an article about a oil filter that claims to be 95% effective down to 5 microns, and 99% at 10 microns. Might be good enough.
All About Oil Filters

Here is some supporting info on micron ratings as well:
Efficient Oil Filtration Recommend : Motor Oil

[1skatingrin]

my trans is E4OD .The articles were very informative thank you .I would like to keep this setup because my temp senser is located in the filter mounting.I dont know pressure or flow rate so i am reluctant to use just any oil filter that fits.this existing filter has been in for 30000 miles now. Thanks again Gary.

[RV Bubba]

I used to have a MH with a Ford 460/C6 drivetrain. I put on an auxiliary tramsmission filter from NAPA. I suggest you take off the old filter, or at least get any numbers off it and go see a NAPA store. Another place to find odd-ball filters is a farm equipment dealer. You need to find a store that is willing to spend some time looking things up.

[Mike Canter]

5 microns is real small, are you sure that is correct. Diesel fuel is thinner than ATF and they will not go smaller than 10 microns because you lose flow and anything smaller is just not going to damage anything. It would seem to me that the same applies to an automatic transmission. Allison filters are not that fine and they go on forever. I am not sure a second filter is really needed in your transmission. One thing to think about with a 5 micron filter is that it can block up very easily and you can lose that flow through the cooler. I bet a 30 micron will be just fine.

[Gary RVRoamer]

Quote:

Diesel fuel is thinner than ATF and they will not go smaller than 10 microns

Who told you that? The secondary filter on most diesel fuel lines is about 2 microns and will deliver around 8-11 GPM. For example, the WIX #33697 for the Cummins ISC and ISL engines.

[Mike Canter]

Secondary on my Detroit is a 10 micron but we are talking diesel fuel and not ATF. Secondary on my previous Cummins was a 10 micron also. If it is a 2 micron then it has to have a real large area and not a small inline filter.

[Gary RVRoamer]

Yeap - they are a large can filter, not the little inline ones. A particle in the 5-10 micron range can really mess up an injector pump or injector.

[Mike Canter]

I agree but not on an automatic transmission. The other concern would be that line that goes to the cooler is coming out of the converter so if you limit the flow on that line the transmission will be hotter. We have this problem when we use automatic transmissions in big horsepower drag racing cars.

[1skatingrin]

thanks Mike and Gary .my oringle micromax filter looked very similar to spin on auto oil filter costing less than ten dollars at camping world about 15 years ago. i probably will just remove this aux filter since its been installed so long now and might be restricting flow.thanks again .Bill

[w6pea]

Gary
Thanks for the links interesting.


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