Engine ID |
Post Reply |
Author | |
gerrym
Member Joined: 20 Sep. 2011 Location: Ontario Canada Status: Offline Points: 219 |
Post Options
Thanks(0)
Posted: 17 Sep. 2019 at 3:53am |
Need help with engine ID. It’s an L-Head. Not sure what year. I see a date 9-17. Does this mean September 17th. What year?
Where I would have expected to see an engine number I don’t. As you can see it’s blank. The engine casting number? appears to be 641087-L-W? (Maybe O,G,3) A-N CR-N2. Does this tell me anything about the engine? There is also a plate. What does this engine plate info tell me? Thanks for any help you can give me. Hope fully I can figure out how to post pics. |
|
mbullism
Member Sponsor Member x 4 Joined: 29 May 2015 Location: MA Status: Offline Points: 4760 |
Post Options
Thanks(0)
|
641087 is standard 2A fare... n
The generic tag tells you when it was rebuilt at that time, the bores were cut 0.020 over, and the main and rod journals on the crank were ground 0.010". Nothing says more work wasnt done after that, but I'd like to think a subsequent builder would have at least removed the tag
Edited by mbullism - 17 Sep. 2019 at 11:40am |
|
Those who do not learn from history are doomed to repeat it... Welcome to 1930's Germany
|
|
JayBob
Member Joined: 20 Aug. 2019 Location: Huntington, IN Status: Offline Points: 141 |
Post Options
Thanks(0)
|
The engine serial number is etched into the area above the water pump on the front of the engine. Not sure if that's what you're looking for or not. Mine is barely readable...but it's there.
|
|
1948 Willys CJ2A (restoration in progress)
1952 Ford 8N tractor restored 1997 Jeep TJ 265,000 miles, DD and mudder...I like to live dangerously. |
|
Ol' Unreliable
Member Joined: 25 Sep. 2016 Location: CO Springs CO Status: Offline Points: 4226 |
Post Options
Thanks(0)
|
The oval pad would only have been used on a 638632 casting # block. A 641087 would have its serial # located as previously noted.
|
|
There's a reason it's called Ol' Unreliable
|
|
gerrym
Member Joined: 20 Sep. 2011 Location: Ontario Canada Status: Offline Points: 219 |
Post Options
Thanks(0)
|
Ok. I’ll look closer for an engine serial number above the water pump. In the meantime, I have a second L-Head. Can’t find a date but the casting number is 804380-W-13-D-P5 CUCR and the engine serial number (I found this one) is 4LR142198. Can these be used to determine year or any other info?
|
|
mbullism
Member Sponsor Member x 4 Joined: 29 May 2015 Location: MA Status: Offline Points: 4760 |
Post Options
Thanks(0)
|
The "4LR" was typically a 4 cylinder L head Replacement (a.k.a Crate) engine
|
|
Those who do not learn from history are doomed to repeat it... Welcome to 1930's Germany
|
|
gerrym
Member Joined: 20 Sep. 2011 Location: Ontario Canada Status: Offline Points: 219 |
Post Options
Thanks(0)
|
can the casting number and serial number be used to determine year?
|
|
mbullism
Member Sponsor Member x 4 Joined: 29 May 2015 Location: MA Status: Offline Points: 4760 |
Post Options
Thanks(0)
|
Casting numbers represent versions of the same thing with usually minor differences. They ran for months or even years without change, so usually not much help trying to get to a year let alone a month week or day
Serial numbers for engines were never tied to vehicle serial numbers... you sometimes can estimate a 2a based on engine number, the the later you get the more they were making runs of engines for other things at the same time. Given a 4LR engine was specifically made for use as a replacement, and no records are out there that im aware of. I think its of little use. If you really need to know, i’d drop the oil pan and look for a date stamp on the oil pan mating surface of the block, usually towards the rear near the rear main. Not sure they did it for 4LRs, but if there it would be the date the raw casting was machined... usually like two weeks to a month after casting-
|
|
Those who do not learn from history are doomed to repeat it... Welcome to 1930's Germany
|
|
Ol' Unreliable
Member Joined: 25 Sep. 2016 Location: CO Springs CO Status: Offline Points: 4226 |
Post Options
Thanks(0)
|
You may be able to determine the year of the engine, but it may not necessarily be the year of the Jeep it's in.
|
|
There's a reason it's called Ol' Unreliable
|
|
Post Reply | |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |