View Full Version : DCs, 25 Kohlers and dust

Richard Martin
10-27-2001, 04:49 PM
If you're running a DC with the 25 Kohler and have the Thompson filter system you should check the seal or lack-there-of between the aluminum Kohler air filter housing and it's baseplate. Since it has been so dry here and I am grinding up leaves I decided to pull my entire filter system apart to check for dust and I found a lot of really small dust inside the Kohler filter housing. It has been leaking past the non-seal between the housing and the baseplate. A trip to the hardware store netted me a 12" by 12" peice of 1/16" thick rubber. I cut myself a nice rubber seal for the bottom of the housing.

Eric, if you read this you may want to pass this along to Art when you see him this week. The best air filters in the world don't do a lick of good if dust is getting by them.

10-29-2001, 05:43 AM
I have just had my walker with kohler 20 hp pulled down and re -ringed due to the same problem.The breather hose under base plate of the carby was found not to be correctly clipped into base which caused large amounts of dust to be sucked into carby.This was covered by warranty but only by 2 months left in warranty period .Any one with a kohler engine should check same.
redards Dave from the land down under:angry:

10-29-2001, 07:18 AM
Maybe it's time to break out the ol' duck tape and wrap the housing up.

10-29-2001, 10:11 AM
I was not so lcuky, i had the same problem of air going around the air filter, with only 366 hours on the mower i just had to replace the engine. The engine is covered under warantee but they say its my fault the air filter is not working properly. ("i didnt keep it clean") -- I even brought it into the shop once b/c i thought to much crap was building up in the carb.

nice $1,200 expense:(

i am going to try and find a different filter setup for this new engine (that i dont have yet)

10-29-2001, 10:52 AM
Were is that seal located? Is it between the aluminum adapter and the top of the carb? Was it originally a gasket? Let me know if you could I am interested in that.

Richard Martin
10-29-2001, 02:03 PM

My DC did not come with any kind of seal in the area I mentioned. Let me better describe where the seal doesn't exist on my DC.

First you have the Turbinator, then a black hose connects that to the large cannister filter, then another black hose with a 90 degree bend connects that to the aluminum Kohler air cleaner housing. The Kohler air cleaner housing sits on top of a round aluminum plate that attaches to the carb. There is no seal where the Kohler housing meets the round aluminum plate and this is where the dust was leaking in. I will post a pic later of the whole arrangement.

10-29-2001, 03:02 PM
Is this what your talking about? http://albums.photopoint.com/j/View?u=1504403&a=11355600&p=55788745&Sequence=0&res=high

Richard Martin
10-29-2001, 03:22 PM

This is what I'm talking about...

This is with the air cleaner put together.

<img src="http://members.aol.com/richardmartin/cleaner1.jpg">

This is with the cover removed. The screwdriver is holding up the rubber seal that I made.

<img src="http://members.aol.com/richardmartin/cleaner2.jpg">

10-29-2001, 03:31 PM
I just noticed the same thing on mine today. It started to stall when I was going through dusty areas and then I tightened the screw that holds the filter in place and that solved the problem. But I like your idea, it should keep the thing from loosening up and seal it much better

John DiMartino
10-29-2001, 06:49 PM
Thanks for the info Richard,between the drought,and the leaves here,it is literally a dust bowl,even on thich lawns this year.Im afradi to look at mine after reading your post.I opened it up,just to check in the spring,and the kohler filter was mint,and the donaldson was like new,it only had 175 hrs on it then,but I had done qiute a few dusty leaf clean ups.

Richard Martin
10-29-2001, 08:37 PM
I don't know why I keep calling the Donaldson filter a Thompson. If you see me reference a Thompson in the future just subsitute Donaldson for Thompson.

10-29-2001, 08:52 PM
Richard, I was just going to post that, but you beat me to it.


Richard Martin
10-30-2001, 06:18 AM

10-30-2001, 10:56 AM
Richard, I would think that any miniscule amount of dirt passing through this metal to metal contact would be caught by the OEM filter. If that cast base plate was bent or tweaked, I could see a larger amount passing through, but I guess now you have a totally sealed system.

BTW the aluminum pot aircleaner top is a DC designed item, the Kohler part is lower and plastic.

Richard Martin
10-30-2001, 11:49 AM
Perhaps on non-DC engines the lower plate is plastic but the one on my engine is made of aluminum that is cast and then milled. Of the entire air filter system the only thing that is made by Kohler is the air filter itself.

10-30-2001, 12:18 PM
Richard, I said TOP not the base. ;)

Richard Martin
10-30-2001, 03:13 PM
You need to explain yourself a little better. It took me a minute to understand what you are trying to say. What you could have said was:

BTW the aluminum pot aircleaner top is a DC designed item, the Kohler aircleaner top is lower and plastic.

10-30-2001, 03:36 PM
Originally posted by TLS
BTW the aluminum pot aircleaner top is a DC designed item, the Kohler part is lower and plastic.

I think the term "lower" should have been substituted by less deep or shallow.

The spun aluminum cover that the rubber hose from the "Donaldson" airfilter connects to is a DC only item. The Kohler OEM filter cover is plastic and takes a shallower round filter. These are found on other manufacturers products.

We all know what each other is talking about, right?


I just think that the small amount of dirt you are seeing is harmless and the regular NON "Donaldson" filter will have no problem filtering this out.

However, I feel that for as cheap a fix it is, that DC should incorporate it into future models.

I love hardware stores!

Richard Martin
10-30-2001, 05:24 PM
TLS wrote:
However, I feel that for as cheap a fix it is, that DC should incorporate it into future models.

It should not be neccesary. The word is that the Kohler 25 is getting dropped from the lineup and is being replaced by the Generac 31 hp engine. Also the 2001-1/2 DCs have done away with the Kohler filter/aluminum housing as well as the Turbinator and the Donaldson filter all together. The Donaldson was replaced with the Nelson with a Nelson precleaner.

10-30-2001, 06:44 PM
were did you hear about the 31 hp I am looking for a more powerful DC and hope to see one soon.

Richard Martin
10-30-2001, 07:02 PM
From a person I'd consider to be a very reliable source and it was also reported in this thread also: