Engine identification - JeepForum.com

 
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post #1 of 8 Old 02-16-2012, 09:51 AM Thread Starter
Mean Max
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Engine identification

Okay fellas, solve this one, or help me figure it out.

I have a 1981 CJ7 with a 258 in it & I need to decode the engine serial number. The number is as follows:

8CL08

This is the number stamped into the block on a machined surface located on the right hand side between cylinders 2&3.

Any help will be appreciated!

Max


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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

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post #2 of 8 Old 02-16-2012, 10:14 AM
scoutboater
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Hey Max,

I'm not finding anything with the numbers you have given, but what I am finding is that we should be looking for a 6 digit number, starting with a 3 (I think) if the engine was built in '79, or a 0 if the engine was built in '80.

Any chance you could post up some pics of the number on the block?

BTW, this is what I'm referencing for the block numbers. (You might have to click "proceed to link destination"...)
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post #3 of 8 Old 02-16-2012, 11:35 AM Thread Starter
Mean Max
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I should have been more precise about the CJ. It's not mine, and I actually don't have it in my possession at the moment. I have a Jeep/4X4 shop & the owner is a new customer who doing a lot of work himself. I haven't seen the numbers in person, but he wrote them down & brought them to me.

He & I looked at an '85 CJ7 258 block I have on the engine stand in the shop. It has 6 digits on it, and we both agreed that his block seemed a digit shy of a full number, but he was certain that he copied down correctly.

Also, he mentioned that the stamping on his block was much smaller size print than the one in my shop.

Does any of this help explain anything?

Max

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Quote:
Originally Posted by UltimatE View Post
Max has a picture of every Jeep part ever made.
Quote:
Originally Posted by Benderff View Post
No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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post #4 of 8 Old 02-16-2012, 12:17 PM
scoutboater
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Unfortunately, I'm not going to be of much help if that is the case. I tried to find the number you gave a few different places online, but to no avail. Hopefully someone more knowledgable will drop in and enlighten us.

Good Luck!
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post #5 of 8 Old 02-16-2012, 03:17 PM
agear
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Try this. There is also a block casting number on the drivers side of the block, you may be able to verify the year range of the block with that.

http://webspace.webring.com/people/d...j_numbers.html

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #6 of 8 Old 02-16-2012, 04:46 PM
Pathkiller
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I think that's a build code for a newer version 258, of the 4.2 era used in the YJ. I think the decoding sites already listed only go up to the mid 80's. My guess is it's an early 90's 4.2L/258 from a YJ.
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post #7 of 8 Old 02-16-2012, 04:52 PM
superj
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i got the date off my block on the driver's side, back by the firewall and under the intake

I don't feel like working on anything at this time so i sold my yj.
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post #8 of 8 Old 02-16-2012, 05:15 PM
CJ7-Tim
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Look on the manifold side for the casting number. The stamped numbers are usually the actual assembly/build date.

4.2 L casting numbers
'70-'72: 3199962
'73-'74: 3218618, 3222380, 3213867
'75-'79: 3227445, 3224098
'80: 3235077
'81-'89: 3235444


1975-79 258 4.2L 1/2" Head bolts

Blocks: 3227445 and 3224098
Head: 3227258
Crank: 3214723


1980 258 4.2L 1/2" Head bolts

Block: 3235077
Head: 3227258
Crank: 3214723


1981-85 258 4.2L 7/16" Head bolts

Block: 3235444
Heads: 3933000, 3224480, and 3241656
Crank: 3235477


1986 258 4.2L 1/2" Head bolts

Block: 3227444
Head: 3933002
Crank: 3235477


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