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What oil filter element do I need?

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sean View Drop Down
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    Posted: 10 July 2011 at 9:58am
Q:  what oil filter element does the CJ-2A use?

A:  depends on which filter canister assembly you have

Over the years, 5 different canisters were used, calling for 4 different elements.  Most auto parts stores (and online filter lookups), when asked for a "CJ-2A" filter, ONLY list 1 or 2, not all 4 possibilities.

The list below was compiled using Willys original part numbers at the manufacturers web site cross-reference lookups.  Try them for yourself:

Fram: http://www.framcatalog.com/
Napa: https://napaonline.com/
Purolator: http://www.purolatorautofilters.net/Pages/home.aspx
Wix: http://www.wixfilters.com/


1) Identify your filter assembly.  Use the parts lists illustrations.  They are plenty clear enough to identify each of the 5 filter assemblies.

2) find the corresponding element below (all dimensions in inches)

Shown in 1st. ('45) & 2nd. ('47) parts lists:

p/n A-1230 -  Oil filter Assembly (Fram F4 "Military Junior", w/2 bands)
p/n A-1236 - Element, oil filter (not listed in any of the cross-references)
superceded by p/n 119952 (Fram C21) in later "Popular Parts List":

Fram:  C4P  -  4.83 h x 4.33 od x .55 id
NAPA:  1100  -  5 h x 4.53 od x .533 id (cellulose)
Wix:  51100  -  5.007 h x 4.094 od x .553
Purolator:  L20051  -  4.69 h x 4.00 od x .54



Shown in 2nd. ('47)  parts list:

p/n 643147 - Oil filter Assembly (Fram w/welded bracket, illustration #27)
p/n 643182 - Element, oil filter (not shown in illustration, does not x-ref)
superceded by p/n 645637 - Element (from illustration)

Fram:  C4P  -  4.83 h x 4.33 od x .55 id
NAPA:  1006 - 5 h x 4.156 od x .553 id, 10 micron (cellulose)
Wix:  51006 - 5.007 h x 4.094 od x .553 id, 32 micron
Purolator:  L30034 - 4.87 h x 4.21 od x .53 id

p/n 645638 - Oil filter Assembly (Purolator 1-band bracket, illustration #11)
p/n 645636 - Element, oil filter

Fram: C134PL - 4.11 h x 3.48 od x .7 id
NAPA: 1080 - 4.218 h x 3.367 od x .578 id, 19 microns
Wix: 51080 - 4.218 h x 3.367 od x .578 iid, 21 microns
Purolator: L20700 - 4.12 h x 3.44 odx .53t/.81b id



Shown in 3rd. ('49)  parts list:

p/n unknown - Oil filter assembly (Purolator 2-band bracket, illustration #18)
p/n 645636 - Element, oil filter (same as above)

p/n 647342 - Oil filter assembly (Fram F3-P2, 2 mounting ears, illustration #8)
p/n 647345 - Element, oil filter

Fram: C3P - 4.22 h x 3.84 od x .55 id
NAPA: 1010 - 4.375 h x 3.718 od x .553 id, 30 micron
Wix: 51010 - 4.375 h x 3.718 od x .553 id, 32 micron
Purolator: L20701 - 4.39 h x 3.72 od x .53 id



Another element listed in the 1961 "Popular Parts List", supercedes 645636:

p/n 911208 (Purolator)

Fram: C134PL
Purolator: L20700

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Post Options Post Options   Thanks (0) Thanks(0)   Quote AbeCJ2A Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct. 2014 at 12:27am
My 2A came with no oil filter and I have always wondered if they were an option, or if mine just had it removed.  I'd like to add one and would consider a modern aftermarket remote set-up, or an original, but I'm not sure were to plumb it in.  I see a few possible ports that may have oil pressure, but I'm not sure and have not tested them.  Any comments?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote scoutpilot Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct. 2014 at 5:30am
The high pressure port is forward and down slightly from the fuel pump. There should be a square shouldered 1/4" NPT plug there. Installation of the high pressure (out to filter) line is best accomplished with the fuel pump removed. Use a 90ยบ fitting.
The low pressure return enters at the timing gear cover top. Brazed to the cover is a 1/4" NPT female fitting. Installation of the low pressure line is best accomplished with the fan removed and the generator displaced.
Old-fashioned service never goes out of style.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AbeCJ2A Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct. 2014 at 8:39pm
I think I see a plug below and slightly forward of the centerline of the pump which sounds like the one you are referring to, and I also see a square plug in a downward angled port rearward and slightly below the pump that I thought might be the one.  Any idea what that one is for?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote scoutpilot Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct. 2014 at 6:02am
I believe it is a low-pressure drain plug only removed for rebuilding.
Old-fashioned service never goes out of style.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rocketeer Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct. 2014 at 8:22am







Edited by rocketeer - 22 Oct. 2014 at 8:27am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote scoutpilot Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct. 2014 at 8:31am
That diagram is confusing. It shows the line running to the fitting behind, not ahead of the fuel pump. The photo shows the correct place.
Old-fashioned service never goes out of style.
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