Want to reutilize a 1996 Jeep 4.0ltr:
 

Hi there. My name is Rob Swallows. I have a 1996 Jeep Cherokee Sport which runs excellent w/just over 300K trouble free miles on the odometer. I'm vaguely familiar with the Jeep having driven it myself 283K of the miles and would still be driving it if floorboard existed..... It is rusted badly and unsafe to operate any longer but still runs excellent.

I would like to install the engine into another application being an air compressor. I can make the adapter to mount and interconnect everything but I'm in need of an electrical interconnection diagram to make it run using the existing parts from the vehicle. Of course not all the electronics and interfaces will be used, so would like to ask if anyone has a condensed diagram to utilized only the basic engine and it's necessary sensors? I'm going to replace a Continental flat head gas engine of about 125hp so this engine should operate comfortably in it's new application.

After I begin to disassemble the Jeep, I'll make parts available to forum members as other than the rusty floorboards and rocker panels, it is pretty serviceable. The trans, (automatic) transfer case, drive axles all function well and have never given problems.

I would much rather help someone else out still running one of these than drag the carcass across the scales. In Illinois where I am, it's difficult to find one of these worth transplanting the engine into due to the rust issues prevalent around here.

Thanks for any assist.

Rob

Thanks for your interest. I was able to make the engine run on a stand built up reutilizing the engine control sensors, PCM, partial wiring harnesses, and such. Gone are all the ancillary inputs not needed when the engine no longer supports it's original installation. Kind of a rudimentary setup really and easily broken down into component parts/inputs.

Now to fabricate the flywheel housing adapter and stub shaft/plate to drive the screw air compressor. Will be nice to have the easy starting fuel injected engine replacing the cantankerous original. Hopefully a bit cheaper to operate also.

Sounds like an interesting project, and I'd love to see some pictures of the progress. You must have lots of room for a compressor big enough to house a 4.0.

The 4.0 engine is about four inches shorter than the original Continental. Not quite as tall either but the use of the Jeep's original cooling fans and ducting should alleviate any cooling issues.

Glad to see the moderation team at work. Both an attempted hijacking, and reply are removed from the thread.

Good Job!

Rob

Would anyone have a torque curve for this engine? I'm looking for peak torque of the engine to configure a drive to keep the engine operating within it's peak power band. The compressor section needs driven at about 2100 rpm, (+/-) and I'm certain this 4.0ltr will differ and the input to the compressor will need to be slowed from engine speed.

Thanks,

Rob

Ordered an o/h gasket and seal set for the engine. Need to plastigauge the bearing clearances prior to ordering bearings but while it's out and on the stand as it will be easy roll in new parts along with a timing chain and oil pump for piece of mind if nothing else. No readily available adapter to go from the Jeep bellhousing pattern to SAE #4, so will modify the original for fitment using the torque converter for flywheel weight, or may acquire a manual trans bellhousing and use a manual transmission flywheel. With the starter motor mounting to the bellhousing, my options are a bit more stringent, but attainable.

We run a pretty tight ship here, LOL

The torque curve has a flat peak from ~3K-3.5K RPM. There are lots of dyno graphs available if you google search "torque curve jeep 4.0".

Nah, not really. They've let me hang around for years! :whistling2:

:D


Rob, that's a fascinating project! Pics or it didn't happen! :thumbsup:

Seriously, I'd love to see it, and I'm sure lots of use would, too.

I actually tried that but limited luck prior to asking the question. I don't have a book on the Jeep as never needed one, (believe it or not) and everything has always worked on the poor thing.

I have no trouble believing that.

I checked through my factory service manual, Rob, and there is no torque curve published there. :(

Thanks kindly. I can't believe this could be so troublesome. I've seen them posted for other chassis but not the 96 Cherokee for some reason. I went 20 pages into Google with the line 1996 Jeep 4.0ltr engine torque curve; all kinds of hits but not what I'm looking for.

Ha! I think I've got it for you, Rob. I searched on "torque curve AMC 242", and here is what I found:


https://cimg3.ibsrv.net/gimg/www.che...4c2ba98f96.jpg
Torque Curve 4.0



Jeep Wrangler 4.0 Limited as offered for the year 1994 for Europe


I suspect any differences between this version and your Cherokee version will be minimal.

EDIT TO ADD: I also found this, which isn't as good.