F-134 Engine I.D.

I’m interested in knowing the manufacturing date on an F-134 engine # 53326. The engine is presently in a 54 3B but those numbers don’t seem correct for that model.

Is there a number along with a letter that would indicate a particular model, like 4J if it belongs to a 3B?

Edit: Just found out that an original 3B engine starts with the prefix 4J. CJ 5 engine?

 

Thanks for the reply Steve.

The 3B site was the first place I looked before posting here. It appears like #53326 could have been built in 54 but not having the prefix 4J excludes it from being an original 3B engine according to the 3B site.

I have looked on my 51 pickup F-134 and there isn’t a number on the water pump boss so this gets me thinking it’s a CJ5 engine or other, if I’m correct they have the engine number on the water pump boss. If some of the guys would be kind enough to check their engine number and post them maybe I can piece it together. Thanks

Edit: My engine number runs 4000 over the vin typically they run 2000-3000 over the longer their in circulation.

 

I understand there are many V6s and 8s on the board, but for those that own the F-134 and would like to post their engine number I would greatly appreciate your help. Number located on the water pump boss. Thanks.
Pic copied from 3B page

 

Chuck- do you have any pics of the 3B? I don't think I've seen it.

Someday, I'll have a 3B

 

http://www.earlycj5.com/forums/showthread.php?t=20761

 

Sweet Chuck! Man am I glad someone from this site bought that JEEP. I just couldn't make the numbers work. Good for you!!!

 

Thanks Dennis, it wouldn’t of worked for me either, but Andy was willing to work with me price wise to make it happen.

Now, if only I could get a CJ 5 engine number.

 

Chuck, The '66 I'm parting out has original f-head # 4J 405443

 

Thanks Sid, I was expecting the CJs wouldn’t have the 4J prefix, do all CJ5 original F-134 have a prefix of 4J similar to the 3B?

 

Chuck, I don't believe they all do. The motor in my '56 supposedly came out of a 3b. That has the 4J prefix in it too. I have another block that came out of a late '60's CJ-5 that I was going to use but it ended up being cracked. That has a 4F prefix,although I suspect it was a reman as it was painted blue and the crank had been turned. Not helping much am I?

 

You are a help Sid, matter of fact every bit of information I get will help me piece it together. Thanks

 

My 65 CJ5 has engine 4J383887

Jay

 

I have two with the 4J prefix, one with an MD prefix, and one with a numerical only serial. The 4J's came from a 3B and 5. Can't say what the others came from.

 

would guess the MD came from an MD otherwise know as.........M38a1.

 

's how the number on my A1 starts.

 

I thought so! Just couldn't prove it, so I didn't post it

 

William, there seems to be evidence building to suggest that the 3B and CJ 5 start with the prefix 4J. I only wish you knew what the numerical only serial number originally came out of. Thanks

 

Chuck here are my 2 #s. Not sure how much help they will be.
1st one is in my 5 Still not sure the real year though. The vin is for a C101 and comes back as a '67 CJ7. R)
MD19323

The 2nd came out of a M38a1 unkown year as well. RMD7749

 

prior to 1967, all F4-134 engine codes were marked 4J plus serial number
(so what happened to 1968?)

First digit = market
M = military
E = export
D = domestic

Second digit = year
R = 1969
S = 1970
T = 1971

Third digit = engine
F = F4-134

Fourth thru sixth digit = Day of year built, plus change if any

Seventh thru eighth digit = undersize rods-mains/oversize bores
(only present if applicable to other than standard)

Ninth digit = replacement value using factory engine
S = service engine
R = short block

Tenth and eleventh = compression ratio
60 = 6.0 to 1
63 = 6.3 to 1
67 = 6.7 to 1
71 = 7.1 to 1