Stock 83í AMC 258 on a 86í Jeep CJ7 ? - JeepForum.com
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post #1 of 16 Old 03-10-2020, 12:05 AM Thread Starter
McTomass
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Stock 83í AMC 258 on a 86í Jeep CJ7 ?

Hi!

Is it possible to have a stock 83í 258 on a 86í Jeep CJ7 ? I donít have the VIN but the registration says that this is 86í Jeep and whatís more it has got Dana 44 rear axle. Front axle is Dana 30 - donít know if it is wide or narrow. Transfer case - Dana 300. I Donít know the model of transmission but it is manual.

Engine numbers:
3..C.. (I donít remember whole number, but I fill it later)
BY EF3235444

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post #2 of 16 Old 03-10-2020, 05:43 AM
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Quote:
Originally Posted by McTomass View Post
Hi!

Is it possible to have a stock 83í 258 on a 86í Jeep CJ7 ? I donít have the VIN but the registration says that this is 86í Jeep and whatís more it has got Dana 44 rear axle. Front axle is Dana 30 - donít know if it is wide or narrow. Transfer case - Dana 300. I Donít know the model of transmission but it is manual.

Engine numbers:
3..C.. (I donít remember whole number, but I fill it later)
BY EF3235444
It's possible that the previous owner swapped it out for another 258 for whatever reason. They could have done it due to all the emissions on the 86 engine, thinking that it would be easier to replace the engine rather than pull all the vacuum hoses and figuring out wiring.

But the 258 was put in more than just Jeeps. AMC had that engine in most of their cars and even in the Renault cars I believe. which makes for a lot of them being produced

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post #3 of 16 Old 03-10-2020, 08:37 AM
dirtdudeaz
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That casting number you listed is for 81 and up blocks. You'll have a head casting number under the valve cover you can check along with the diameter of the head bolts, and an engine build date code on a flat machined part of the block near the 2/3 cylinders and distributor. 1- Year built code; 2/3-Number of the month; 4- Engine size/type; 5/6- Day built
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post #4 of 16 Old 03-10-2020, 08:40 AM
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Probably WideTrac axles, since I believe they switched from NarrowTracs in '82. If it's a 4-sp transmission, I'd bet it's a T-177. With the Dana 44 rear end, there's also a good chance it could be a well-optioned package (Renegade, Laredo, Golden Eagle, et al).

Are you looking to pick it up?
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post #5 of 16 Old 03-10-2020, 02:57 PM Thread Starter
McTomass
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The number that I didn't remember is 301C25 - I think it says that the engine was built in 83', but the car is 86'.

Yes, I want to buy this CJ7, but there is a problem with VIN, which is necessary to register the car in Poland. If the seller will find it, I would buy this car. The car is in restoration process, so it is hard to find VIN, because parts are all over the place.

The car looks stock to me, but is it possible to have 3 years younger engine in a factory car or is it a swap from other car ? Or maybe the engine is 86' but the numbers are wrong decoded ?

I have some pictures before and after "restoration" - maybe it will help.
https://drive.google.com/open?id=1P6...lhEQhcZy6vIGVG
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post #6 of 16 Old 03-10-2020, 03:59 PM
Matt1981CJ7
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Itís not likely a Ď86 came with a Ď83 engine from the factory. It was probably swapped out for a worn out Ď86 engine.

Matt
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post #7 of 16 Old 03-10-2020, 04:01 PM
whollsee
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Originally Posted by McTomass View Post
The number that I didn't remember is 301C25 - I think it says that the engine was built in 83', but the car is 86'.

Yes, I want to buy this CJ7, but there is a problem with VIN, which is necessary to register the car in Poland. If the seller will find it, I would buy this car. The car is in restoration process, so it is hard to find VIN, because parts are all over the place.

The car looks stock to me, but is it possible to have 3 years younger engine in a factory car or is it a swap from other car ? Or maybe the engine is 86' but the numbers are wrong decoded ?

I have some pictures before and after "restoration" - maybe it will help.
https://drive.google.com/open?id=1P6...lhEQhcZy6vIGVG
Just my take on it but I believe it is possible for the block to have been cast in '83 and engine assembled in 86. The head if it is an '86 may be stamped as such...and possibly require 1/2" head bolts, dependant on casting, and not 7/16" [this has been disputed on here before but have seen references to that bolt size since]

I have an original '85 engine with an '82 block casting and an original '82 with an '82 block casting.

Can you post any stampings you can see on the head here?

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post #8 of 16 Old 03-10-2020, 08:29 PM Thread Starter
McTomass
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Do I have to tear down the engine to see this numbers or am I able to see it on the surface like the block coding ? Can you all open the photos on google drive that I uploaded ? Thanks.
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post #9 of 16 Old 03-10-2020, 08:56 PM
whollsee
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Do I have to tear down the engine to see this numbers or am I able to see it on the surface like the block coding ? Can you all open the photos on google drive that I uploaded ? Thanks.
Sorry. Head casting number is under the valve cover.

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post #10 of 16 Old 03-10-2020, 09:32 PM Thread Starter
McTomass
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So if it's stock engine it should have 1/2 head bolts and 3933002 head casting ? I hope this engine is stock. Maybe they mixed parts in factory because this is the last year of CJ7 production, so they put in what was left xD
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post #11 of 16 Old 03-10-2020, 10:03 PM
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Originally Posted by McTomass View Post
So if it's stock engine it should have 1/2 head bolts and 3933002 head casting ? I hope this engine is stock. Maybe they mixed parts in factory because this is the last year of CJ7 production, so they put in what was left xD
If it is a later 86 build then possibly.The presence of a D44 suggests it may be. 3933002 is the 1/2" casting number.

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post #12 of 16 Old 03-11-2020, 05:19 AM
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No, AMC/Jeep would not have used or put in a 83' motor into an 86' model year CJ. Late 85' motor into an early 86' model is possible but since it has the D44 rear axle, that is another no. Date code on engine states it was built on January 25, 1983 so it was installed in a 1983 model year vehicle. There should also be a raised casting year date for the head as well, in between the #1 cylinders intake and exhaust ports at the top, next to valve cover. The intake manifold on later years will also have a date code as well and that will be in front, stamped on the #1 and #2 cylinder intake runners (see photo below).


Missing VIN tags on the tub and windshield frame, all three of them? How do you know the tub is even a 1986 model year then? But there is a few hints on the sheet metal that will verify year...


Cast date on this intake manifold: October 3, 1983
Attached Thumbnails
1983 Intake manifold Date Code.jpg  

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post #13 of 16 Old 03-11-2020, 12:43 PM Thread Starter
McTomass
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But is this head number located under valve cover ? I know that there should be a number under, but is there another outside ? I will check the manifold number.

There are 3 VIN locations - frame, tub and on the wiper motor plate ? In this Jeep that I want to buy there is no VIN on the tub, there may be VIN on the frame under the paint, but not for sure, and the seller is searching for the wiper motor plate - I hope he finds it and there will be VIN. There is a problem with searching because the car is in parts.
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post #14 of 16 Old 03-11-2020, 04:59 PM
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Originally Posted by keith460 View Post
There should also be a raised casting year date for the head as well, in between the #1 cylinders intake and exhaust ports at the top, next to valve cover.

Answered where the year code is on the head in previous thread and it's not under the valve cover.

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post #15 of 16 Old 03-11-2020, 05:52 PM
whollsee
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Here is my 1985 head with raised "85" in location indicated by Keith.

img_5580-1-.jpg

It's all academic though if you can't locate a vin#. If it was an '86 body and you found a vin, would an older engine be a deal-breaker?

Are there many CJ7s in Poland?

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