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Author Topic: So it's not a 3A motor so...  (Read 5418 times)

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Offline rooney77

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So it's not a 3A motor so...
« on: May 11, 2013, 02:11:56 PM »
Any ideas what it's from?



« Last Edit: May 11, 2013, 02:13:45 PM by rooney77 »
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53 CJ3A basket case resto project.
42 MB crawler w/VW TDI diesel.

Offline 1955CJ-5

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Re: So it's not a 3A motor so...
« Reply #1 on: May 11, 2013, 02:56:06 PM »
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.
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1955 CJ-5, A friend for 58 years....1951 CJ-3A, a new addition. 1929 Model A Ford Closed Cab Pickup...

Offline rooney77

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Re: So it's not a 3A motor so...
« Reply #2 on: May 11, 2013, 03:21:08 PM »
Just browsing the images it looks like it may be an M38/MC block. So what's an MC?

Water pump boss number J143005.
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53 CJ3A basket case resto project.
42 MB crawler w/VW TDI diesel.

Offline 1955CJ-5

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Re: So it's not a 3A motor so...
« Reply #3 on: May 11, 2013, 03:49:41 PM »
Is there a "3" in front of that "J"?...that would make it a 3A motor...

Look closely!!
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Offline rooney77

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Re: So it's not a 3A motor so...
« Reply #4 on: May 11, 2013, 05:01:37 PM »
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?
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42 MB crawler w/VW TDI diesel.

Offline athawk11

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Re: So it's not a 3A motor so...
« Reply #5 on: May 11, 2013, 05:34:55 PM »
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
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Offline 1955CJ-5

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Re: So it's not a 3A motor so...
« Reply #6 on: May 11, 2013, 06:07:58 PM »
Quote
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: May 11, 2013, 06:14:53 PM by 1955CJ-5 »
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Offline F Bill

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Re: So it's not a 3A motor so...
« Reply #7 on: May 12, 2013, 09:06:38 AM »
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.
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Offline garage gnome

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Re: So it's not a 3A motor so...
« Reply #8 on: May 12, 2013, 09:28:34 AM »
2A engine serial numbers start with CJ2A, then numbers after it.
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Offline F Bill

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Re: So it's not a 3A motor so...
« Reply #9 on: May 12, 2013, 09:32:21 AM »
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.
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Based in central TX and upstate NY.

Offline garage gnome

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Re: So it's not a 3A motor so...
« Reply #10 on: May 12, 2013, 09:33:23 AM »
My '46 2A engine starts with CJ2A.
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Nate in Western MA 1953 3A #3268, The Jalopy, '47 2A Wheelin' rig, '49 3A, #37071, unmolested, bone stock named Ted

Offline Bob W

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Re: So it's not a 3A motor so...
« Reply #11 on: May 12, 2013, 05:23:56 PM »
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".
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Offline 1955CJ-5

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Re: So it's not a 3A motor so...
« Reply #12 on: May 12, 2013, 06:19:12 PM »
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...
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1955 CJ-5, A friend for 58 years....1951 CJ-3A, a new addition. 1929 Model A Ford Closed Cab Pickup...

Offline rooney77

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Re: So it's not a 3A motor so...
« Reply #13 on: May 12, 2013, 06:41:45 PM »
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.
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Offline athawk11

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Re: So it's not a 3A motor so...
« Reply #14 on: May 12, 2013, 08:41:45 PM »
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....


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