Can I take a motor from a 97 xj auto and bolt it directly into a 94 xj manual??

 

The flywheel would be my concern - I'm pretty sure they have the same bolt paterns, but the flywheel would need to be changed. The other difference is going from a OBD I to OBD II motor, you would need to change the wiring harness and ecu.

 

The motor sounds like a decent deal $400 for motor and trans (which I don't need) but no CPU or wiring harness.

Eveything else is there power steering, A/C etc

Just don't know if its worth all the work. Or should I just rebuild the top end of mine. I'm at 208,000 miles with a little noise. Could be exhaust manifold, just haven't got that far yet.

 

I know the A/C brackets are different because the intake manifold will be a little different... Rebuilding the top end... well that will run a little more for the parts, labor, and you run the risk of tightning the head (new valve seals etc...), while the piston rings need attention too and causing more blow through for that reason. The sensors on the 97 will be different so the wire harness and ecu are manditory. The fuel pump may need to be changed for pressure reasons - I know the 97 has more psi to the injectors than the 94 but could be just from the way the FPR is... They are identical engines - it may be easier than I am thinking. I would weigh all options carefully cause which ever way you go will cost money.

 

Thanks for the info.

Thats alot of food for thought.

May have to look a little deeper on whats causing my noise. I just hate the thought of being out in the middle of nowhere with 208,000 miles.

 

Sorry but not true.

Use the original vehicle's manifolds, sensors, flywheel and distributor if different. Bolts right in.

 

For clarification:
XJ Cherokee and ZJ Grand Cherokee 4.0L engine blocks interchange.

2000+ TJ Wrangler and WJ Grand Cherokee 4.0L engine blocks interchange.

XJ/ZJ blocks and 2000+ TJ/WJ blocks do not interchange without significant modifications. (1997-1999 4.0L TJ Wrangler blocks will interchange in XJ/ZJ and visa-versa).

TJ/WJ 4.0L Engine blocks underwent clean sheet design changes effective in the 1999 WJ Grand and 2000 TJ Wrangler. These blocks are not interchangeable with XJ/ZJ engine blocks. The reason is motor mount bolt holes and belt driven accessory mounting bolt holes are in different locations, or not present at all, TJ/WJ vs. XJ/ZJ.

 

It will work real easily. No need to hesitate.

 

And use my CPU and wiring harness?

Even tough mine is a OBD I and this engine is a OBD II?

 

the old flexplate will bolt up

and he doesnt need the wiring and ecu. the blocks and heads are the same.

again, the longblocks are the same. just use all the old stuff.


The one difference between longblocks would be the newer motor wont have a spot for the coolant temp sender (for the guage) as obd2 xjs guage uses the same sensor as the computer does.

its in the head at the rear of the motor. one wire going to it. you can just drill and tap a hole into the new block, or do what i did and drill and tap a hole in the thermostat housing.

except for that the 4.0's from 1991 to 1999.5 is 100% compatible with eachother.

(Guys, if ya don't know what you are talking about, don't post the wrong information.)

 

X2

 

THANKS! Sounds like I need to go pick up a motor this weekend.

Of course I may be back with lots more questions.

 

I see you've gotten your answer.

Bring on the questions when you need to.

 

After all this talk, the guy either sold the motor or he has changed his mind.
No response, any more.
I guess its back to the drawing board, or at least back to craigslist.

 

Well, that sucks. There will be more available and you are now equipped with the truth about interchangeability and come jump on the next one.