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Engine 49 FAR 10090

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bocephus0697 View Drop Down
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    Posted: 13 Jan. 2018 at 4:55pm
anyone have any idea what this engine number means? It's in a mostly original 1947 CJ2A. 
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Ol' Unreliable View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ol' Unreliable Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jan. 2018 at 8:33pm
One thing it means is nobody has decked the block since the engine was last assembled...  It may also mean that it's not the original engine, but I can't say for sure.  Someone here will know.
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bocephus0697 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bocephus0697 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jan. 2018 at 8:47pm
what do you mean by "decked the block?" Sorry. I'm new and trying to learn. Thanks for the info.
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Ol' Unreliable View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ol' Unreliable Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jan. 2018 at 9:07pm
"Decked" means resurfaced by grinding.  If the deck is warped or otherwise uneven, a good shop will deck the block to make it flat again.  Some might also deck the block to increase the compression ratio.  Grinding it will usually remove the serial number, unless the shop re-stamps it, which is rare.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jan. 2018 at 9:09pm
When an engine is rebuild in order to get the Block to Head joint as perfect as possible sometimes it is necessary to both shave a little material off the head and to do the same to the top of the block this is referred to as DECKING the block.

MY engine currently has had the Head Shaved .035" (which was done to help raise the compression ratio in a quest for more HP) and the Block has been Decked .007" (this was done to "true" it up) it also helped add to the increased compression ratio.


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1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962
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bocephus0697 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bocephus0697 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jan. 2018 at 9:31pm
wow. Thanks. That's good info to k ow. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote athawk11 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jan. 2018 at 11:13pm
Bottom line is that this is not an original serial number for this engine.  It was probably restamped by a rebuilder.

There are sometimes other indicators which can help date the engine block.  There are a sequence of casting numbers on both sides along the lower part of the block...down by the oil pan.  

1- 1946 CJ2A   
2- 1949 CJ3A
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruce W Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jan. 2018 at 11:43pm
Originally posted by Ol' Unreliable Ol' Unreliable wrote:

One thing it means is nobody has decked the block since the engine was last assembled...  
 Believe it or not, that actually makes sense to me.......  WinkLOL  BW
Happy Trails! Good-bye, Good Luck, and May the Good Lord Take a Likin' to You!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan. 2018 at 1:07am
Wouldn't it be rather hard to deck the block with the engine assembled?
Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mbullism Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan. 2018 at 5:54am
Hard"er", yes... but if you're good...Wink
(And seriously fast, lol)
1946 CJ2A #69750 - "Plowshare"
2016 JK unlimited (Hers)
1969 Kaiser CJ5 (sold)

Analog spoken here....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wadoyado Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan. 2018 at 9:07am
Originally posted by Bruce W Bruce W wrote:

Originally posted by Ol' Unreliable Ol' Unreliable wrote:

One thing it means is nobody has decked the block since the engine was last assembled...  


 Believe it or not, that actually makes sense to me.......  WinkLOL  BW
                                        Probably right, but technically speaking it is possible to grind the block w/o taking the no. off. Joe W
"It's unbelievable how much you don't know about the jeep you've been driving all your life" (Mickey Mantle paraphrase)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EMyers Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan. 2018 at 10:07am
Originally posted by wadoyado wadoyado wrote:

       Probably right, but technically speaking it is possible to grind the block w/o taking the no. off. Joe W
How is this done and is decking necessary or just advisable on all engine rebuilds? Id hate to lose that original stamping! 

(I have more questions and need advice on my situation, but Ill post that on my jeep project to keep this thread on topic.... https://www.thecj2apage.com/forums/new-member-project-46-cj2a_topic41246.html


Edited by EMyers - 14 Jan. 2018 at 10:09am
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bocephus0697 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bocephus0697 Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan. 2018 at 10:25am
dang. So possibly the original but rebuilt. But possibly the wrong engine. Is there anywhere else the the engine number is stamped? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wadoyado Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan. 2018 at 10:29am
As far as how is this done, with a big enough grinder it could be ground cross-wise stopping and returning before it hits the nos. Something I'd consider only on a total rebuild you can get a pretty good idea if you need to deck the block just by using a good straight edge. Joe W
"It's unbelievable how much you don't know about the jeep you've been driving all your life" (Mickey Mantle paraphrase)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EMyers Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan. 2018 at 11:20am
Originally posted by bocephus0697 bocephus0697 wrote:

dang. So possibly the original but rebuilt. But possibly the wrong engine. Is there anywhere else the the engine number is stamped? 

Originally posted by athawk11 athawk11 wrote:

There are sometimes other indicators which can help date the engine block.  There are a sequence of casting numbers on both sides along the lower part of the block...down by the oil pan.  


Check this out
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