MB GPW Dry Air Filter Conversion Done

1941 - 1945, MB, GPW modifications, sugestions, and ideas, official MWO's and unofficial WWII field mods NO EBAY or COMMERCIAL SALES.
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tamnalan
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Re: MB GPW Dry Air Filter Conversion Done

Post by tamnalan » Wed Apr 29, 2015 5:36 pm

I did mine about 5 years ago, using the foam rubber rings no longer available from McMaster Carr.

The rings are in great shape. I just had my air cleaner apart a few weeks ago.
Alan W. Johnson
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MB-TD, Mar 2012
Ford 91C, 1939

Marty, SoCal
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Re: MB GPW Dry Air Filter Conversion Done

Post by Marty, SoCal » Wed Apr 29, 2015 6:15 pm

Good to know!

Anyone else check theirs recently?
43 Ford GPW 92098
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
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tamnalan
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Re: MB GPW Dry Air Filter Conversion Done

Post by tamnalan » Wed Apr 29, 2015 8:01 pm

I am very happy with it. I have no idea why the vendor kits are so expensive. $80 or something? I spent about $5 plus maybe $10 for the filter.

I'm sure McMaster Carr still sells those rings. We just have to figure out what the new part number is.
Alan W. Johnson
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MB-TD, Mar 2012
Ford 91C, 1939

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Fred Coldwell
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Re: MB GPW Dry Air Filter Conversion - a Question

Post by Fred Coldwell » Sun Jan 29, 2017 10:06 am

thovis wrote:Note: that article was updated a couple months ago, and confirmed, the McMaster gaskets size (smaller) were changed over 2 years ago. In addition it was confirmed that the plumbingsupply.com has the correct size. This was updated in the article with the correct size needed. Hope it clarifies. Source Plumingsupply.com 5-3/8"od x 3-1/2"id x 1" thick
thovis:

I just checked the web site today at plumbingsupply.com and it no longer shows the exact size ring you quote above, which is also listed in the article on Tom H's web site here: http://1945mb.com/c-80-G503_WWII_Jeep_O ... ilter.aspx.

In checking plumbingsupply.com's web site today, the o.d. of the 1" thick "Sponge Gaskets/Rings - for wall hung toilets" is listed as 5-5/8" o.d., and NOT the 5-3/8" o.d. you and Tom's article mention. The thickest ring listed as having a 5-3/8" o.d. (which is the max. i.d of my oil bath air filter housing) is 3/4" thick, apparently the same thickness as the old, discontinued and former correctly-sized McMaster-Carr toilet ring gasket per an earlier post in this thread.

I asked Tom if he used plumbingsupply.com's 3/4" thick sponge ring or their slightly larger diameter 1" thick sponge ring; and if he used the 1" thick one, whether its o.d. actually was 5-3/8" or actually was 5-5/8". He replied he had bought the McMaster-Carr foam rings many year ago before their o.d. was increased to 6-3/4" from 5-3/8", so he had no experience with the foam rings from plumbing supply.com. He said someone sent him that information and so he posted it as a possible substitute for the earlier, and no longer available, McMaster-Carr foam rings.

I have also sent a question to plumbingsupply.com asking them to confirm the o.d. of their 1" thick sponge rubber gaskets but have not yet heard back from them. So here is my question to anyone who has done this conversion in the last 4 years using the foam rings from plumbingsupply.com:

EDIT 2-25-2017: I have since heard back from plumbingsupply.com and they confirmed their 1" thick gasket has an OD of 5-5/8", which is greater than the 5-3/8" ID of the Oakes air cleaner, so I did not use it. I used their 5-3/8" OD x 3-1/2" ID x 3/4" thick foam gasket and it seems to work very well.

1. Did you use the 5-3/8" diameter rings that are 3/4" thick? If yes, how do they fit and is the NAPA 2036 air filter held tightly in place?

2. Did you use the 5-5/8" diameter rings that are 1" thick? If so, do they fit without any trimming and is the NAPA 2036 air filter held tightly in place?

3. Does anyone know whether plumbing supply.com revised the o.d. of the 1" thick ring from 5-3/8" to 5-5/8 " sometime during the past 4 years, after Tom mentioned the 1" thick ring in his article?

I'd like feedback from someone's experience before ordering the foam rings from plumbingsupply.com. Thank you in advance for your replies. :)
Last edited by Fred Coldwell on Sat Feb 25, 2017 3:21 pm, edited 1 time in total.
Happy Jeep Trails,

Fred Coldwell
1944 CJ2-09 - X33
1945 CJ2-26 - X50
1944 Dodge T233 CC
1945 Dodge T233 Utility
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Re: MB GPW Dry Air Filter Conversion Done

Post by Rod Rushton » Mon Jan 30, 2017 1:57 pm

Some years ago I decided to convert my GPW Air Filter to a dry element one. The actual filter itself is a propriety and fairly commonly available item.
Unable to locate any of the toilet rings here in the UK, I decided to fabricate my own. I had recently bought a new computer and it came packed in a carton surrounded by slabs of a very resilient and oil proof foam about 1" thick. This I subsequently discovered was a product called "Stratocell" I used a tank cutter to cut out a circle for the base to fit into what was the oilpan.
I needed to locate the top seal of the filter element in the old airfilter body, so cut a ring from hard plastic, which I secured with polyurethane adhesive.
After 4 years and several thousands of miles I'm pleased to report everything is still working perfectly. The best thing about the conversion is the ease and speed which the element can be replaced without having to remove the entire filter body - apart from the theoretical increase in air flow to the carb.
I found this on the internet regarding the foam:-
STPE200 is a medium density non cross linked expanded polyethylene foam plank/sheet sometimes sold under the trade names Stratocell, Jiffy or Ethafoam. This is a very versatile foam that is light weight and flexible, clean and non abrasive. It provides excellent cushioned protection against persistent shocks in a large variety of packaging applications. It's the preferred foam for computer and monitor packaging and many other sensitive items including historic and priceless objects.
Shock and vibration absorbing.
Excellent strength.
Impervious to mildew, rot and bacteria.
Resilient and lightweight.
Wear and tear resistant.
Water resistant

I have produced several kits complete with new paper filter elements, and had no trouble with them at all
Rod Rushton - Winner 2013 MVT Wilkinson Sword Trophy
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FORD GPW 202055 DoD 5 - 22 - 44 Serial# 20534360
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Re: MB GPW Dry Air Filter Conversion Done

Post by Fred Coldwell » Sat Feb 25, 2017 3:14 pm

UPDATE: February 25, 2017.

Here are the available materials I used in February, 2017 to modify my Oakes No. 613300 oil bath air cleaner into a paper filter element air cleaner:

1. One (1) NAPA GOLD air filter #2036 @ $8.49 (or equivalent -- see earlier posts for their part numbers).
2. Two (2) sponge gaskets for wall hung toilet 5-3/8" OD x 3-1/2" ID x 3/4" thick @ $5.27 + shipping from http://www.plumbingsupply.com.

as seen here:

Image

Here they are assembled right side up:

Image

After the internal oil bath filter screen is removed and the air cleaner and bottom cup are cleaned and dried, turn the air cleaner upside down for assembly and place one ring in the top of the air cleaner. Insert the air filter and center it on that ring. Place the other ring in the bottom of the bottom cup and center the bottom cup on the upside down air filter. There is about 1/2 inch of available compression before the two clamps are positioned to hold the bottom cup in place, as seen here:

Image

Shaking the air cleaner after the clamps have been tightened suggests there is enough clamping force to prevent the air filter from moving. But if you want a bit more clamping force, cut a disc of suitable material having a suitable thickness with an Outside Diameter (OD) of 5-3/8" and place it in the bottom of the bottom cup before inserting the foam gasket in that cup.

After the air filter is installed in your jeep, you should be able to change the paper air filter element by simply unclamping to bottom cup, removing the old element and installing a new paper element in its place. Happy jeeping on . . .
Happy Jeep Trails,

Fred Coldwell
1944 CJ2-09 - X33
1945 CJ2-26 - X50
1944 Dodge T233 CC
1945 Dodge T233 Utility
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Re: MB GPW Dry Air Filter Conversion Done

Post by Marty, SoCal » Sun Feb 26, 2017 8:47 am

Good job tracking all that down!

I would suggest painting the inside of the oil cup, since any water that may get into the air cleaner may cause rusting.
43 Ford GPW 92098
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license

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Re: MB GPW Dry Air Filter Conversion Done

Post by tamnalan » Sun Feb 26, 2017 4:18 pm

Indeed! Thank you Fred! We have rings again!!
Alan W. Johnson
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M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939

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Re: MB GPW Dry Air Filter Conversion Done

Post by Fred Coldwell » Sun Feb 26, 2017 7:25 pm

Marty, SoCal wrote:Good job tracking all that down! I would suggest painting the inside of the oil cup, since any water that may get into the air cleaner may cause rusting.
Hi Marty:

I thoroughly scrubbed, cleaned, dried, primed and painted both the inside and outside of the Oakes No. 613300 air cleaner and its bottom cup before assembly, but forgot to mention that step in the summary. The 1/2 inch of available compression shown in the upside-down photo nicely matches the operating range of the two clamps, so when the clamps are closed everything is nice and tight. Thanks too, Alan. Let Freedom ring anew! :D
Happy Jeep Trails,

Fred Coldwell
1944 CJ2-09 - X33
1945 CJ2-26 - X50
1944 Dodge T233 CC
1945 Dodge T233 Utility
MVPA #283C

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Re: MB GPW Dry Air Filter Conversion Done

Post by Marty, SoCal » Sun Feb 26, 2017 7:36 pm

Sweet!
43 Ford GPW 92098
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license

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Re: MB GPW Dry Air Filter Conversion Done

Post by ozm29c » Thu Mar 02, 2017 7:27 pm

I also ordered the McMaster Carr rubber rings and like others posting here found that they had changed. In the end I modified my OEM air filter to accept a WIX filter element;
http://www.fleetfilter.com/filter/42036.html?
This mod was for my weasel air filter but will suit an MB/GPW.
JW
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Re: MB GPW Dry Air Filter Conversion Done

Post by Jeff H » Tue Mar 07, 2017 10:04 pm

These pressed steel adapters used to be available years ago.
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Re: MB GPW Dry Air Filter Conversion Done

Post by jeepagain » Sun Jul 16, 2017 9:31 am

ozm29c wrote:
Thu Mar 02, 2017 7:27 pm
I also ordered the McMaster Carr rubber rings and like others posting here found that they had changed. In the end I modified my OEM air filter to accept a WIX filter element;
http://www.fleetfilter.com/filter/42036.html?
This mod was for my weasel air filter but will suit an MB/GPW.
JW
Very nice. Did you fabricate the end caps yourself?

Thx,
Neil (jeepagain)

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Re: MB GPW Dry Air Filter Conversion Done

Post by ozm29c » Tue Jul 18, 2017 10:44 pm

Using a lathe I just machined them out of Aluminium plate.
GPW 135997
M29C 7333
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Re: MB GPW Dry Air Filter Conversion Done

Post by pkozak1 » Fri Jul 21, 2017 6:04 am

Would you mind sharing or selling the machinist drawings for those plates?

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