Motor Time! -
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post #1 of 6 Old 05-20-2005, 08:29 AM Thread Starter
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1991 YJ Wrangler 
Join Date: Mar 2005
Location: Cleveland Ohio
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Motor Time!

It's friday morning, this is the weekend that my brother and myself will be putting the engine into the 91 YJ Islander. The 4.0 donor motor is from a 95 Cherokee that lost an argument with inertia. As best we can tell, this motor has less than 20k miles on it, even the freeze plugs are rust free, which in cleveland is a very good sign of low miles, road salt is rough. The YJ came with a 4.0 so I don't forsee any real trouble with the swap. I went and got a new clutch kit for it, not entirely sure I "had" to, but it will be apart, might as well. Going to replace main seal, pan and valve cover gaskets beforehand as well. I'm very excited, tons of body work to do afterward, but this is the big one, the heart transplant if you will.

Now on to my question, is there anything else I should consider replacing/checking/praying over while shaking shiney beads, during this swap? Any considerations I'm not aware of to putting a 95 cherokee motor(auto trans) into a 91 YJ (AX15)? Any advice in general for this swap that we might not have covered/considered would be appreciated.

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post #2 of 6 Old 05-20-2005, 06:33 PM
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You have a 91 so i assme that is Fuel Injection. Is it Throttle Body Injection or does it have MPFI like the 95? Reason I ask is that the fuel pumps could be different.

89 yj w/ mopar mpi and 4.0 head.94 ax-15 tranny and t-case, more mods comin.
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post #3 of 6 Old 05-21-2005, 05:17 AM Thread Starter
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Both engines are the 4.0 HO MPI I6. The biggest difference is that the replacement engine was connected to an auto trans, and my YJ is the 5-speed AX-15. I'm just trying to avoid running into assembly problems, hopefully flywheel/pilot bearing/transmission will all transfer easily. I've done numerous searches and research and have no reason to believe they won't, but since this is my first jeep, I figured to ask the experts . Like everything else, the job is in the prep
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post #4 of 6 Old 05-22-2005, 05:25 AM Thread Starter
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after noting a difference in cranks we did some measuring... the boneyard motor has a 4.2 crank in it, making it a stroker! Guess it's time to start hunting for a new rear, the D35 with 200k+ miles on it probly won't handle it for long. lol
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post #5 of 6 Old 09-14-2011, 03:29 PM
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I agree with you. Upgrade now while you're building everything else. If you're going to fix it do it right the first time to eliminate future headaches.
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post #6 of 6 Old 09-14-2011, 03:34 PM
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