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CJ3B Bulletin Board > CJ-3B related Buy / Sell Posts > Oil Bath Air Filter


Title: Oil Bath Air Filter
Description: Stock or Conversion?


Oswald - October 28, 2009 12:02 AM (GMT)
Anyone have comments on the oil bath air filter?
Sometimes it seems like my 3B wants to breathe a bit more.
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I have been looking at paper filter conversions and was wondering if anyone has done this. This set-up is for a mb or gpw. Our filter would be different.

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Others have said the oil bath is a source of moisture. And others have said the oil bath is the best type of filter made.

I could see in a military or agricultural application where this thing would be great. But my Jeep doesn't see much desert convoys or plowing.

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Comments

1954cj3b - October 28, 2009 12:12 AM (GMT)
heres an origanal paper air filter out of a 54 3b
I just sold this one sure someone has one for sale somewhere
if you wanted to keep origanal look
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HOGHEAD - October 28, 2009 01:52 AM (GMT)
My 64 CJ-5 is stock 4cyl,, & I plan on getting one of the cone shaped paper air filters that will fit in the stock tube off the carb,, The oil bath was a real mess ,,,I think K&N make one that you spray a light oil on ,,Supposed to breath real good,,
Heres what they look like :

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yjcanibul - October 28, 2009 02:44 AM (GMT)
I run a k&n on my wrangler with headers/catback exhaust which works well, I found the mud dried on it due to underhood temps then drew the oil out of my filter causing it to need frequent servicing, I then bought a little slipon cover for it which helps keep the mud chunks off oil (2nd pic) and doesnt restrict airflow more than 3%.

they say these 'cold air' style filters dont help the stock I6 engine because the original air box will supply enough flow - but headers and catback exhaust need more that it can deliver , so I guess the question is does the 3B original filter system restrict airflow ...

this is install off the 3B page, search for RU820 on 3B page for a few details

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here is the little spash cover I put on wrangler to keep the oil in the filter longer, would recommend it where mud is involved, its called a K&N precharger ...

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HOGHEAD - October 28, 2009 02:48 AM (GMT)
Yeah thats the ticket yjcanibu... I might put this filter on my cj-5,, Maybe a Willys sticker on the chrome & it will look as if its stock to YJ & KJ drivers... K&N wants less than 20 bucks for it..

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jeeper50 - October 28, 2009 11:01 AM (GMT)
I have a problem with my stock air cleaner filling with water sometimes after a heavy rain due to a crappy hood gutter. I think I'll swap over to the KN but leave the aircleaner in my stock location.

yjcanibul - October 29, 2009 05:07 AM (GMT)
came across this on ebay - item# 120485154466 , came on his '47
willys - fram air filter conversion housing

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yjcanibul - November 8, 2009 05:48 PM (GMT)
looks like the fram housings were once
popular as here's one on a '50 3A flathead

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elawson - November 8, 2009 08:15 PM (GMT)
I used to collapse the hose between the filter and the carburetor. I washed the filter out with kerosene and got a huge amount of dirt and crud out of the filter. Now the hose doesn't collapse. It made such a difference in air flow that I had to readjust the idle mixture.

Eric

ParadigmCrime - November 19, 2009 09:23 PM (GMT)
Here's what I did

Toss that worthless oil bath unless you are going for a complete restoration

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derekredmond - November 21, 2009 02:35 PM (GMT)
Does anybody know if Fram still makes those filter cartridges that fit in the oil bath housing?

Derek

CJ3BWillys - November 27, 2009 10:18 AM (GMT)
QUOTE (derekredmond @ Nov 22 2009, 12:35 AM)
Does anybody know if Fram still makes those filter cartridges that fit in the oil bath housing?

Derek

ok... lets try and make this clear.... i cut all the steel wool out of my original aircleaner, i thin cut out the inner metal wall with a 90 degree angle grinder at the lip where it all joins together to the top of the aircleaner. Then i cut a disk out of 2mm alloy that would fit in there nicely which i mounted with silicone. Before i did the mounting i cut a 2" hole in the disk and found a few screw togerther plastic fittings from the hardware store. I screwed these together on each side of the alloy disk and mounted a K & N on the bottom and put it all together holding the disk in with silicone. Then the bottom cover gets fitted and its done. You have a K & N filter inside the original aircleaner and it all looks original ! I hope this is not too confusing but i have to do another one in a few weeks so i will take some photos for the group.

jeeper50 - November 27, 2009 01:04 PM (GMT)
What part number K/N filter did you use? Pics will be real handy for all of us wanting to do this mod to our aircleaner

Don - November 28, 2009 02:21 PM (GMT)

http://www.42fordgpw.com/mods2.html

I found this info on a conversion a lot like Oswald mentioned at the start of this post. I haven't tried it yet but It's on my list of future projects.

CJ3BWillys - November 29, 2009 10:32 AM (GMT)
QUOTE (Don @ Nov 29 2009, 12:21 AM)
http://www.42fordgpw.com/mods2.html

I found this info on a conversion a lot like Oswald mentioned at the start of this post. I haven't tried it yet but It's on my list of future projects.

If you can give me a few days to get around to the job again i will post all the pics and part numbers

jeeper50 - November 29, 2009 08:37 PM (GMT)
the "G" has more info here; www.g503.com/forums/viewtopic.php?f=10&t=17884

Now, is the Oates type air cleaner the same internal diameter as the Donaldson type? My jeep is at the hunting club and can't measure the internal diameter.

Jax - November 30, 2009 10:23 PM (GMT)
I like the info. on the g503.com & 42fordgpw.com pages & I'll be interested to see the pictures from "CJ3BWillys" own conversion.
I saw a conversion kit on the Peter DeBella parts web page.
http://www.debellajeepparts.com/mbpremier.htm
To see it scroll down near bottom on the MB GPW PREMIER PARTS page . Looks like its for an Oakes "standard type", a bit expensive @ $85. Don't know if it would work on a Donaldson but at least it shows there are options out there.
Aloha, Jax B)





CJ3BWillys - December 15, 2009 11:32 AM (GMT)
Sorry to take so long to get back to you but i have taken all the photos today and will upload tomorrow with instructions.

CJ3BWillys - December 15, 2009 11:50 PM (GMT)
Hello again, this is slightly different to how I normally modify and air cleaner because I couldn't get the right size filter from our parts supplier. This works exactly the same way and will provide the same amount of clean air as the other way we do it but you get the idea. Hopefully all the images will work out and it is fairly self-explanatory. Just follow the pictures.

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CJ3BWillys - December 15, 2009 11:51 PM (GMT)
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CJ3BWillys - December 15, 2009 11:52 PM (GMT)
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CJ3BWillys - December 15, 2009 11:53 PM (GMT)
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CJ3BWillys - December 15, 2009 11:53 PM (GMT)
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CJ3BWillys - December 15, 2009 11:54 PM (GMT)
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CJ3BWillys - December 15, 2009 11:54 PM (GMT)
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CJ3BWillys - December 15, 2009 11:55 PM (GMT)
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Oswald - December 16, 2009 11:29 AM (GMT)
Nice work and great pictures thanks for the plan.

jeeper50 - December 16, 2009 11:32 PM (GMT)
Can you give me some measurements from your air cleaner housing? What is the inside diameter and the height from your mounting plate to the bottom of the housing? My air cleaner is still installed and my 3B is at the hunting club property.

I can't wait to get mine home to gut my housing and swap over to a dry air cleaner.

CJ3BWillys - December 17, 2009 09:44 AM (GMT)
The distance from the mounting plate to the base of the air-filter is 5", anything longer wont fit and will be squashed when fitting the bottom cover.

Its a great idea and the dry filters are only 10 or 15 dollars now they have been made popular by the boy racers.

Oswald - December 17, 2009 11:16 AM (GMT)
Well how's it work?

Have you given it a run yet?

Does it make any strange sounds?

Looking forward to your review.

ps it looks warm where you are. Not here, back in the teens again.

CJ3BWillys - December 17, 2009 11:20 AM (GMT)
Hows it work.... i have done about 4 of them now, it seems to increase performance marginally but the real difference is a reduction in fuel consumption by about 10%!

It sounds just like the standard airfilter before hacking it apart....

In your language we are well over the 100 mark, start of summer, such is life downunder.....

jeeper50 - December 17, 2009 09:16 PM (GMT)
What size did you cut the aluminum plate to mount the filter to? Been checking out filters on ebay- lots to choose from just don't want to pull the trigger on one until I can gut mine out.

Glad to hear it helps the engine breath better.

CJ3BWillys - December 17, 2009 10:53 PM (GMT)
Hello there, I'm not sure that I have ever measured the diameter to be honest. All I do is put the air filter canister down onto a sheet of aluminium, trace around the outside with a pencil and then cut it out with a jigsaw with the blade positioned just inside the line and it becomes a perfect fit. Many thanks Michael

jeeper50 - December 18, 2009 12:40 AM (GMT)
Okay, thanks for the great pictures.

jim - December 22, 2009 12:04 PM (GMT)
Does anyone know where I can buy an original replacement air filter for a 53?

Thanks




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