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-   -   1987 MJ v8 swap help (https://www.jeepforum.com/forum/f53/1987-mj-v8-swap-help-1462335/)

Thejim42 01-11-2013 04:39 PM

1987 MJ v8 swap help
 
I just bought my uncles 87 comanche 2wd that had the 4.0 i6 but he kept it for his wrangler. I have a 5.2 v8 out of my dakota that got crushed by a tree and im trying to find info on what it would take to put the 5.2 in the jeep. I've seen people put 5.9 v8s in them and the 5.2 and 5.9 are interchangeable so what would i need to do?

cruiser54 01-11-2013 09:19 PM

Lots.

DeejayZeejay 01-12-2013 08:11 PM

Been researching this a bit, as I'm thinking of doing this.... Requires quite a bit. Wiring harness reworked/modified with computers. Beefier coils, radiator, engine mount Fab, exhaust routing, crossmember modification, sheetmetal work, driveshafts.... and more. Would be so worth it!

97_4popper 01-13-2013 05:33 PM

It has been done, but I understand that keeping a V8 cool in this engine compartment can be an issue.

ftpiercecracker 01-13-2013 07:02 PM

Quote:

Originally Posted by 97_4popper (Post 14783865)
It has been done, but I understand that keeping a V8 cool in this engine compartment can be an issue.


HIGH cfm fans electric or mechanical, 3 core ALL metal radiator, high flow t-stat, high flow water pump, and if all else fails

hood vents. :thumbsup:

Thejim42 01-14-2013 11:15 AM

so would it just be cheaper and easier to sell my 5.2 buy a 4.0? since that was in it originally?

DeejayZeejay 01-14-2013 01:00 PM

Yes

Thejim42 01-14-2013 05:44 PM

will the H.O chrysler straight six fit in place of the AMC straight six? I read that they have all the same mounts and hook-ups. does anyone have any insight? and what years and models should i look at getting the motor from? the is a guy with a H.O from his 93 XJ that he is holding for me...will that work?

oderalxjlaredo 01-19-2013 06:54 PM

IIRC a number of sensors are different on the Chrysler version. I think the knock sensor, camshaft position sensor, crankshaft position sensor, at the very least are different for the Renix (Renault-Bendix computer used in the AMC models). I think the exhaust and intake manifolds changed a few times - but not sure which years. There is a pretty good amount of info in this forum if you search for "Chrysler to AMC 4.0 Swap" or something along those lines. It has been done many times before without too much trouble. While you are in there, you may want to upgrade the cooling system to the newer style without the pressure bottle.

Thejim42 01-28-2013 06:56 PM

what year did they change because i found an 89 cherokee with the straight six. if i remember correctly they change in 91. will the 89 motor work in my 87?

Madeoflite 01-30-2013 12:35 PM

I have a 88 Comanche 4.0, tranny, and wiring harness ill make you a good deal on

Thejim42 02-01-2013 06:01 PM

How many miles? 4wd or 2wd and is it auto or stick?

billyzj 02-05-2013 05:05 AM

Quote:

Originally Posted by Madeoflite (Post 14879529)
I have a 88 Comanche 4.0, tranny, and wiring harness ill make you a good deal on

wheres it at in fl and how much

Madeoflite 02-05-2013 10:15 AM

Quote:

Originally Posted by billyzj

wheres it at in fl and how much

Central Florida(Tampa area) pm me ill make you a great deal


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