Replacing engine

[Trebor]

I'm considering replacing the engine on our 91 Cherokee, it's rattling and clunking away. I friend of mine is selling a 2000 Cherokee engine. Will this be an easy swap? How much adapting of the engine will it take or should I just look for a closer year engine?
Thanks

[ratherbcamping]

You will need to swap over the distributor and probably all the accessories from the 91. Might have to swap valve cover and manifolds as well.

I just put a 99 engine in my 96 by swapping everything over. Only issue was there is no place for the temp sensor at the back of the head. I moved my sensor to the radiator bung, but a better place would be the t-stat housing if you can figure out how to get both sensors mounted together. It just goes to the gauge on in the instrument panel anyway.

Are you running a closed radiator system? If so, it might be hard to bleed the cooling system without the sensor hole at the rear of the head.

[Jess]

91 should be open.

[Trebor]

Would there be any issues that would be computer realted between the two motors?

[ratherbcamping]

Would there be any issues that would be computer realted between the two motors?Not if you switch over the manifolds, distributor, sensors and accessories.

That's the nice thing about the 4.0, with the exception of the Renix (87-89) engines, which have a different head port design, you can swap them pretty easy. Heck, I even ran a Renix head on my 96 and had no problems. Despite what some poeple say, it can be done and it will work. I just had to alter the gasket to work.