The CJ3A Page Forum - So it's not a 3A motor so...

The CJ3A Page

Welcome, Guest. Please Login

The CJ3A page at Facebook

News:

The CJ3A Page Forum › Willys CJ-3A Technical Knowledge Base › Tech Talk › So it's not a 3A motor so...

‹ Previous Topic | Next Topic ›

Page Index Toggle

Pages: [1] 2

Print

Hot Topic (More than 10 Replies)

So it's not a 3A motor so... (Read 4098 times)

rooney77 Project Jeep Offline Still Plays With Jeeps Posts: 22 Location: America Joined: 06/15/12 Gender:	So it's not a 3A motor so... 05/11/13 at 18:11:56	Print Post
	Any ideas what it's from?
	« Last Edit: 05/11/13 at 18:13:45 by rooney77 »
	53 CJ3A basket case resto project. 42 MB crawler w/VW TDI diesel.
	IP Logged

1955CJ-5 Flatfender Master 2013 Sponsor Member 2016 Sponsor Member 2015 Sponsor Member Offline It wasn't always green.... Posts: 2338 Location: Boise, idaho Joined: 12/18/12 Gender:	Re: So it's not a 3A motor so... Reply #1 - 05/11/13 at 18:56:06	Print Post
	Lots of info here.... http://ww2jeeps.com/htm/Lheadmain.htm Is there a number stamped on the flat spot above the opening for the water pump? You may need to lightly sand it or use a wire brush, then a little oil rubbed on the area might bring the numbers out.

	1955 CJ-5, A friend for 55 years....1951 CJ-3A, a new addition. 1929 Model A Ford Closed Cab Pickup...
	IP Logged

rooney77 Project Jeep Offline Still Plays With Jeeps Posts: 22 Location: America Joined: 06/15/12 Gender:	Re: So it's not a 3A motor so... Reply #2 - 05/11/13 at 19:21:08	Print Post
	Just browsing the images it looks like it may be an M38/MC block. So what's an MC? Water pump boss number J143005.

	53 CJ3A basket case resto project. 42 MB crawler w/VW TDI diesel.
	IP Logged

1955CJ-5 Flatfender Master 2013 Sponsor Member 2016 Sponsor Member 2015 Sponsor Member Offline It wasn't always green.... Posts: 2338 Location: Boise, idaho Joined: 12/18/12 Gender:	Re: So it's not a 3A motor so... Reply #3 - 05/11/13 at 19:49:41	Print Post
	Is there a "3" in front of that "J"?...that would make it a 3A motor... Look closely!!

	1955 CJ-5, A friend for 55 years....1951 CJ-3A, a new addition. 1929 Model A Ford Closed Cab Pickup...
	IP Logged

rooney77 Project Jeep Offline Still Plays With Jeeps Posts: 22 Location: America Joined: 06/15/12 Gender:	Re: So it's not a 3A motor so... Reply #4 - 05/11/13 at 21:01:37	Print Post
	Well there is a curve that could be the bottom of a 3 but it's in such bad shape it's very hard to tell. I thought 3a motors had the boss behind the oilfilter?

	53 CJ3A basket case resto project. 42 MB crawler w/VW TDI diesel.
	IP Logged

athawk11 YaBB Administrator Owner Member 2012 2016 Sponsor Member 2015 Sponsor Member Offline 1949 CJ3A Posts: 2771 Location: Arvada, Colorado Joined: 01/26/11 Gender:	Re: So it's not a 3A motor so... Reply #5 - 05/11/13 at 21:34:55	Print Post
	There was the MA... Prototype WWII jeep Then there is the famous MB...WWII Jeep. Then there was the MC... The Korean War Jeep. It is commonly referred to as the M38. Many consider it the finest flat fender ever made. Welcome back to the site. Tim

	2-1949 CJ3A 1-1946 CJ2A
	IP Logged

1955CJ-5 Flatfender Master 2013 Sponsor Member 2016 Sponsor Member 2015 Sponsor Member Offline It wasn't always green.... Posts: 2338 Location: Boise, idaho Joined: 12/18/12 Gender:	Re: So it's not a 3A motor so... Reply #6 - 05/11/13 at 22:07:58	Print Post
	rooney77 wrote on 05/11/13 at 21:01:37: Well there is a curve that could be the bottom of a 3 but it's in such bad shape it's very hard to tell. I thought 3a motors had the boss behind the oilfilter? There are L-134's that have the boss behind the oil filter, but I don't recall right now the years and models. The only one I've seen was a very early 40's with the chain drive cam. With an engine number as high as yours its likely a 53, just like your jeep....it might be the original engine.... What is the casting number? Early engines had it on the passenger side of the block very low and later they cast it on the drivers side...there might even be a date cast in, according to Bob W's book...a copy is great for research, click the picture at the top of this page and it will take you to a page with an ordering link..
	« Last Edit: 05/11/13 at 22:14:53 by 1955CJ-5 »
	1955 CJ-5, A friend for 55 years....1951 CJ-3A, a new addition. 1929 Model A Ford Closed Cab Pickup...
	IP Logged

F Bill Flatfender Master Offline Posts: 1395 Location: ???? Joined: 12/02/10 Gender:	Re: So it's not a 3A motor so... Reply #7 - 05/12/13 at 13:06:38	Print Post
	If there is no 3 in front of the J it would be a 2A engine number. Looks like a great candidate for a chemical rust remover dip or electrolysis. Hopefully it isn't cracked. If you don't have all the main bearing caps it might not be worth doing anything with.

	Owner of the world famous?? Pintojeep 3A and one yet to be named stock project 3A. Based in central TX and upstate NY.
	IP Logged

garage gnome Flatfender Master 2013 Sponsor Member Offline Rustologist Posts: 1931 Location: Chester Joined: 02/16/12 Gender:	Re: So it's not a 3A motor so... Reply #8 - 05/12/13 at 13:28:34	Print Post
	2A engine serial numbers start with CJ2A, then numbers after it.

	Nate in Western MA 1953 3A #3268, The Jalopy, '47 2A Wheelin' rig, '49 3A, #37071, unmolested, bone stock named Ted
	IP Logged

F Bill Flatfender Master Offline Posts: 1395 Location: ???? Joined: 12/02/10 Gender:	Re: So it's not a 3A motor so... Reply #9 - 05/12/13 at 13:32:21	Print Post
	I don't know for sure if the later serial numbers included the CJ.... I think we need a casting number from the lower passenger side of the block.

	Owner of the world famous?? Pintojeep 3A and one yet to be named stock project 3A. Based in central TX and upstate NY.
	IP Logged

garage gnome Flatfender Master 2013 Sponsor Member Offline Rustologist Posts: 1931 Location: Chester Joined: 02/16/12 Gender:	Re: So it's not a 3A motor so... Reply #10 - 05/12/13 at 13:33:23	Print Post
	My '46 2A engine starts with CJ2A.

	Nate in Western MA 1953 3A #3268, The Jalopy, '47 2A Wheelin' rig, '49 3A, #37071, unmolested, bone stock named Ted
	IP Logged

Bob W Flatfender Master Owner Member 2012 2016 Sponsor Member Offline Posts: 2159 Location: Monticello, NY Joined: 10/19/10 Gender:	Re: So it's not a 3A motor so... Reply #11 - 05/12/13 at 21:23:56	Print Post
	The first CJ-2A engine serial numbers began with a "CJ-2A" prefix but then sometime in about 1946 it was changed to just a "J".

	Bob W
	WWW IP Logged

1955CJ-5 Flatfender Master 2013 Sponsor Member 2016 Sponsor Member 2015 Sponsor Member Offline It wasn't always green.... Posts: 2338 Location: Boise, idaho Joined: 12/18/12 Gender:	Re: So it's not a 3A motor so... Reply #12 - 05/12/13 at 22:19:12	Print Post
	Did it come with a front engine plate, the one with the motor mounts? If it has one mounting ear forward and the other to the rear then you could probably still use it in the 3a...

	1955 CJ-5, A friend for 55 years....1951 CJ-3A, a new addition. 1929 Model A Ford Closed Cab Pickup...
	IP Logged

rooney77 Project Jeep Offline Still Plays With Jeeps Posts: 22 Location: America Joined: 06/15/12 Gender:	Re: So it's not a 3A motor so... Reply #13 - 05/12/13 at 22:41:45	Print Post
	No motor plate. Well I hate to say it but the whole kit and kaboodle is up for grabs now. I'm about to make the ad.

	53 CJ3A basket case resto project. 42 MB crawler w/VW TDI diesel.
	IP Logged

athawk11 YaBB Administrator Owner Member 2012 2016 Sponsor Member 2015 Sponsor Member Offline 1949 CJ3A Posts: 2771 Location: Arvada, Colorado Joined: 01/26/11 Gender:	Re: So it's not a 3A motor so... Reply #14 - 05/13/13 at 00:41:45	Print Post
	Don't feel bad Nate. There have been a dozen times in the past where I think I have these Willys Jeeps figured out, only to be proven wrong. This 46 2A.... Has this serial number....

	2-1949 CJ3A 1-1946 CJ2A
	IP Logged

Page Index Toggle

Pages: [1] 2

Print

‹ Previous Topic | Next Topic ›

Bookmarks:

Google

Google+

Yahoo

« Board Index ‹ Board Top

Top

The CJ3A Page Forum » Powered by YaBB 2.6.11!
YaBB Forum Software © 2000-2026. All Rights Reserved.

Valid XHTML

Valid CSS

Powered by Perl

Source Forge