Engine 49 FAR 10090 |
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bocephus0697
Member Joined: 03 May 2014 Location: tacoma, WA Status: Offline Points: 33 |
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Posted: 13 Jan. 2018 at 9:55pm |
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anyone have any idea what this engine number means? It's in a mostly original 1947 CJ2A.
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Ol' Unreliable
Member Joined: 25 Sep. 2016 Location: CO Springs CO Status: Offline Points: 4226 |
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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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There's a reason it's called Ol' Unreliable
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bocephus0697
Member Joined: 03 May 2014 Location: tacoma, WA Status: Offline Points: 33 |
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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
Member Joined: 25 Sep. 2016 Location: CO Springs CO Status: Offline Points: 4226 |
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"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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There's a reason it's called Ol' Unreliable
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Mark W.
Member Sponsor Member Joined: 09 Nov. 2014 Location: Silverton, OR Status: Offline Points: 7980 |
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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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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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bocephus0697
Member Joined: 03 May 2014 Location: tacoma, WA Status: Offline Points: 33 |
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wow. Thanks. That's good info to k ow.
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athawk11
Member Joined: 18 Jan. 2012 Location: Arvada,Colorado Status: Offline Points: 4151 |
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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. |
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1- 1946 CJ2A
2- 1949 CJ3A |
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Bruce W
Member Joined: 29 July 2005 Location: Northeast Colorado Status: Offline Points: 9649 |
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Believe it or not, that actually makes sense to me....... 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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Mark W.
Member Sponsor Member Joined: 09 Nov. 2014 Location: Silverton, OR Status: Offline Points: 7980 |
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Wouldn't it be rather hard to deck the block with the engine assembled?
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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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mbullism
Member Sponsor Member x 4 Joined: 29 May 2015 Location: MA Status: Offline Points: 4778 |
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Hard"er", yes... but if you're good...
(And seriously fast, lol)
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Those who do not learn from history are doomed to repeat it... Welcome to 1930's Germany
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wadoyado
Member Sponsor Member Joined: 29 Sep. 2016 Location: Mi. Status: Offline Points: 728 |
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"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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EMyers
Member Sponsor Member Joined: 08 Sep. 2017 Location: Buffalo NY Status: Offline Points: 184 |
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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 3:09pm |
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bocephus0697
Member Joined: 03 May 2014 Location: tacoma, WA Status: Offline Points: 33 |
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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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wadoyado
Member Sponsor Member Joined: 29 Sep. 2016 Location: Mi. Status: Offline Points: 728 |
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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
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"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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EMyers
Member Sponsor Member Joined: 08 Sep. 2017 Location: Buffalo NY Status: Offline Points: 184 |
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Check this out
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