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ANOTHER engine block survey! |
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sean 
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 Topic: ANOTHER engine block survey!Posted: 24 Feb. 2011 at 3:50pm |
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Guys & Gals: All this research "data gathering" is a never-ending quest trying to figure out what changed & when, so I need your help once again. Many of you have already sent me your info, thanks for that! No need to reply again, unless you have something new. I need info on the earliest CJ-2A engines, 638632 casting numbers only please! up to engine number 44417. ('45 MB engines may also be helpful) This first batch of info is must have, specially the "W" number!: 1) FULL block casting number: exactly as cast, including dashes, spaces, etc.
And note if the NI-CR part is actually "NI" (n-eye) or "N1" (n-one) 2) Block casting date, with or w/out "clock" symbol 3) Water pump boss length: short or long
4) FULL Engine serial number: exactly as stamped, including dashes, spaces, extra letters, etc.
This next batch of info is not absolutely needed, but would be helpful (and useful to any future research, which is bound to be needed  )5) Where is the engine number stamped: oval side pad or water pump boss? 6) how stamped: on 1-line or 2-lines
7) Block machining/assembly date stamp: typically found on the right rear oil pan flange (but may be elsewhere), but was eventually eliminated. You may or may not find one. This is complete: month-day-year, but sometimes hard to read: date shown below is 9-18-45 (the "45" is barely visible) 8) Serial number of vehicle the engine was installed in (CJ-2A only) You can PM with the info, or post it here. Photos aren't necessary, but post 'em if you want. When I have enough data to draw firm conclusions from, I'll post the findings. Thanks! Sean
Edited by sean - 24 July 2011 at 1:09am |
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samcj2a
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Posted: 24 Feb. 2011 at 4:24pm |
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Sean,
I believe that you have all of my data from 15292 except the block machining date under the oil pan lip. I noticed one glitch in the entry of my engine casting number in the database. My CR-NI has an eye, but you captured it in the database as a one. I entered a change a few days ago, but your assistant who maintains that database is behind!
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sean
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Posted: 24 Feb. 2011 at 4:42pm |
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Sam:
Yes, thank you! The machining date isn't really needed for this phase of research, but it might be sometime in the future. I figured since I'm asking others for lots of details, I might as well ask for more than needed right now, just in case it IS needed later. I should have known to ask for it in prior surveys. 
Damn! Good help is so hard to find these days  , I'll have to dock his paycheck! It's updated now.Sean
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Bruce W
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Posted: 27 Feb. 2011 at 5:36am |
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Sean, Here's info on # CJ2A-10222:
1: 638632 W4 A NI - CR I didn't see any "N2"
2: It has a"clock". The pointer points straight left. The date is "7-19"
3: Short boss
4: CJ2A*10222 Nothing else.
5: Oval Pad
6: All on one line
7: I haven't pulled the pan yet.
8: I got this engine as a spare with my GPW.
Hope this helps, let me know if I can be of any further help. BW
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It is NOT a Jeep Willys! It is a Willys jeep.
Happy Trails! Good-bye, Good Luck, and May the Good Lord Take a Likin' to You! We Have Miles to Jeep, Before We Sleep. |
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sean
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Posted: 27 Feb. 2011 at 2:26pm |
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Thanks Bruce!
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fritz
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Posted: 27 Feb. 2011 at 4:58pm |
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1.) 638632 W3 A NI-CR N2
2.) Time clock, posted far right, second dot from bottom. 10-29
3.) 3 1/8"
4.) CJ-2A 16006
5.) Water Pump Boss
6.) One Line
7.) Cant help you on that one
8.) 15724
Eric
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sean
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Posted: 27 Feb. 2011 at 7:58pm |
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Thank you Fritz!
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Adrian
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Posted: 05 Oct. 2011 at 7:55am |
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Sean, my block number is 638632 W3 A NI CR N2, has clock type cast mar date 10-31, long type water pump boss and single line serial of CJ-2A 14832, perhaps you can advise me if its the original block for my vehicle, serial 14605, Thanks Adrian
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1946 CJ-2A Column Change 14605
1973 Saab 96 |
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sean
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Posted: 05 Oct. 2011 at 1:57pm |
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Thank you Adrian!
I would say your engine is definitely original. The number difference fits right in with other vehicles just before & after yours. Nice find! Sean
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Clone421
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Posted: 06 Oct. 2011 at 2:00am |
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Sean, this engine had the oval pad ground smooth so it might have been an MB engine at some point or factory rebuilt, although I dont remember any part of the engine being factory rebuilt red (too much gunk left on it). 1. Block casting number is 638631 W4 A NI - CR
2. It has a clock. The pointer points straight left and up one dot. The date is 11-12
3. Long Water Pump Boss
4. Single line s/n of CJ-2A 22665
5. Water Pump Boss
6. 1 Line
7. N/A - The pan covers any stamping that may be under it.
8. S/n of Jeep is CJ-2A 21881
A lot on my Willys was untouched and I believe this to be the original engine to the jeep.
If you want the head casting date it is 10 - 25 and the casting number is 640161, it also has W5 below the casting number. Its a smooth head. Edited by Clone421 - 06 Oct. 2011 at 2:01am |
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sean
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Posted: 06 Oct. 2011 at 1:44pm |
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Great info, thank you Kyle!
Can you get a clear photo of the pad? I wouldn't expect MB engines in this serial number range, so the pad might simply have the original machining marks. Sean
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flattiesrule
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Posted: 08 Oct. 2011 at 2:09am |
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Sean,
Just saw this thread updated yesterday, and figured I better get some numbers for you.
1) block casting: 638632 W3 ANI-CR N2
2) date is 10-26, it's also a clock with pointer aimed at the 8th dot.
3) long
4) CJ-2A-15982
5) water pump boss
6) one line
7) haven't checked yet. Will oil pan hide it?
8) s/n is 99462
Obviously this engine is not original to my '47. I'll also start getting all my info listed into the database.
Bob
j
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'47 cj2a
'76 cj7 '01 cherokee sport |
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sean
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Posted: 08 Oct. 2011 at 3:35pm |
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Awesome, thanks Bob!
Yes, the oil pan will hide it. That's OK, it's not needed for this stage of research, but if/when you ever do remove the pan, remember to record the data. Sean
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flattiesrule
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Posted: 08 Oct. 2011 at 10:40pm |
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So Sean, given my early engine number, would that motor have come from a '46?
Wish I knew more about the history of mine, but that wasn't a concern to me when I purchased it back in 1991.
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'47 cj2a
'76 cj7 '01 cherokee sport |
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sean
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Posted: 09 Oct. 2011 at 3:30pm |
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Bob:
Yes. Vehicle s/n would have been about 300 (+/- a few) less than engine number, so around s/n 1568x, would have been installed on the assembly line mid to late Feb, '46. The engine machining/assembly date stamp will likely be early Nov. '45. Sean |
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Tim H
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Posted: 16 Dec. 2011 at 4:07am |
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Sean,
Just joined the forum, inspired by your research. I've owned my CJ-2A for over 30 years: bought it from the original owner who's still alive (now 94). Here's what I can answer about your quiery: 1) 638632-W3 A-NI-CR-N2 There is also a CC located directly above the W3 2) clocked with 8-2 under it, arrow pointed to right at first dot 3) long 4) only two legible symbols: an inverted U with a circle around it and number 2 at an angle 5) oval pad 6) unknown 7) no numbers but a letter S with a circle around it 8) 55800 Hope this makes sense, Tim
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1942 GPW #72495
1946 CJ-2A #55800 |
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sean
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Posted: 16 Dec. 2011 at 2:47pm |
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Welcome aboard Tim! Great engine info, thank you! Your engine is a gear drive, later than this thread is about, but it's good info for my other research! The engine serial number would have been stamped on the long water pump boss. With VIN 55800, original engine number would have been about "J-570xx", give or take a couple of hundred. No evidence of this number on the WP boss? If not, it might have been milled off at some earlier rebuild. Sean
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lsw
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Posted: 17 Dec. 2011 at 4:14am |
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Hello all, New to the sight, I have had cj2a s/n 15363 for about one month. It needs a total restoration, but at least it is not Bubbafied, totally original. I have had a 73 jeep pickup (gladiator) for 12 years.
Here is the data I have a this pint. 1. 638632 W3 A NI-CR N2 2. 10-31, arrow straight up towards middle dot. 3. long water pump boss 4. CJ-2A 15329 5. water pump boss 6. 1 line 7.unknown, pan is still on engine 8. 15363 My son and I are looking forward to a fun project rebuilding it. |
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...I believe that you have all of my data from 15292 except the block machining date under the oil pan lip.