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Unread 10-24-2013, 08:50 PM   #1
Riley/MN
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XJ 4.0 in WJ

This is in response to a guy over in the WJ forum that is talkin about swappin out a 4.0 in a 99 WJ:

Quote:
Originally Posted by ratmonkey View Post
Remember, you can only use engines from 99-2004 grand cherokees and 2001-2006 wranglers.

Most plugs can only go one place, label the fuel injector plugs though.
And I asked:

Quote:
Originally Posted by Riley/MN View Post
Why is this? If I just go with a short block is this still the case? I ask because I have the opportunity to buy a 99 WJ that supposedly has a bad engine, but the body looks okay. I have a 93 XJ with just over 100K on the engine. Can anyone confirm that I cannot put my engine in this Jeep for me?

Thanks
Just thought I would pose the question here as well. Will my 93 XJ block work in a 99 WJ?

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Unread 10-25-2013, 12:17 AM   #2
cory4um
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This has been brought up numerous times before, so a search should net many results.

In short, he is right. Its much much easier to pull 4.0s from certain jeeps.

Xj and wj have different motor mount locations if i recall reading. You may have to measure/drill/tap into the xj block to make it work, if you can even do that...
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Unread 10-25-2013, 06:15 AM   #3
Riley/MN
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Yeah, spent some time with the search button last night...after I asked. HA

Thanks for the reply
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Unread 10-26-2013, 07:15 AM   #4
cruiser54
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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. (1991 to 1995 YJ and 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.


XJ: "Regular" (not Grand) Cherokees 84-01
ZJ: Grand Cherokee 93-98 (Gen1)
WJ: Grand Cherokee 99-04 (Gen2)
YJ: Wrangler 87-95 (Gen1)
TJ: Wrangler 97-06 (Gen2)
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
Refresh*Connections*Before*Replacing*Components
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Unread 10-26-2013, 07:53 AM   #5
chris87xj
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Alright I'm in. This info just helped me out nicely, thanks guys.
Looks like today I'm going to go pick up a 97ZJ motor to swap into my 87XJ.
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Better to hoard Jeep technical info than old newspapers and the neighbor's mail, I guess.......
Vote for the August Cherokee Of The Month here - Yes YOU!!!
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Unread 10-26-2013, 07:55 AM   #6
cruiser54
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Quote:
Originally Posted by chris87xj View Post
Alright I'm in. This info just helped me out nicely, thanks guys.
Looks like today I'm going to go pick up a 97ZJ motor to swap into my 87XJ.
Post 17 will serve you well Chris!!
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
Refresh*Connections*Before*Replacing*Components
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Unread 10-26-2013, 08:00 AM   #7
chris87xj
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Ah I'd forgotten about that, thanks again!

Quote:
Originally Posted by cruiser54 View Post
Post #17
This swap is easier than some will lead you to believe, generally those who have never done it. Those of us who have done it, like myself, will share with you the things that need to be done for a successful swap. Just think of it as swapping in a long block.

The HO and Renix have some differences but none that canít be overcome very easily.
Any HO engine from an XJ or ZJ through 1999 can be used. One running change was that the rear of the head was no longer drilled and tapped for the temperature gauge sender beginning in the 96 model year. The sender can be relocated to the threaded hole in the thermostat housing taken from the HO engine. Youíll have to extend the wire to that location. Some brave souls even drill and tap the HO head for the sender.

You will be using the intake and exhaust manifolds from your Renix, along with all your sensors and wiring. Since the intake ports of the HO are slightly different, you use the Renix gasket. Exhaust ports are identical.

You will need to use your Renix distributor as it is different than the HO because they use different fuel management systems. The flywheel or flexplate from the Renix must be used so your CPS gets the correct signals. The valve cover from the Renix allows you to keep your CCV system intact and requires no modifications.

The HO block will have a plug in the coolant galley on the driverís side of the block, closest to the front, which needs to be removed so your Coolant Temp Sensor can be installed in itís place just as it is on the Renix. It requires a 5/16" square drive or a modified 3/8" drive that has been ground down to fit. Do this before installing the engine.

As for the knock sensor, which is located just above the oil pan on the driverís side of the engine about mid way, all the blocks Iíve seen are threaded for it. If not, Iíve heard they may be drilled but not tapped. Tap the hole if thatís the case.

Revised 03/28/13
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Quote:
Originally Posted by cruiser54 View Post
Better to hoard Jeep technical info than old newspapers and the neighbor's mail, I guess.......
Vote for the August Cherokee Of The Month here - Yes YOU!!!
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Unread 10-26-2013, 08:14 AM   #8
chris87xj
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More discussion, I'll keep it in this thread for now since it seems relevant.
My 87 was born a 4cyl and now rocks a 3.4L GM V6, so nothing Renix under the hood. The wiring harness is custom. I have access to a complete 97xj harness and the ECM from the 97zj. Also have a complete donor 88xj w/Renix that I'd like to use the tranny and transfer case and whatever else I need to complete this frankenstein.

My target ZJ motor has a new exhaust manifold and distributor assembly that would seem preferable to use. Everything on the 88xj donor motor available is in a lot worse shape than the 97zj motor, so I really don't want to bring any of it into the equation that I don't need to.
The 3.4L V6 currently in my 87xj is using the factory Camaro fuel pump so I'm thinking I should get a XJ pump to support the ZJ motor.
I'm still trying to get my head around all the variables.
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Quote:
Originally Posted by cruiser54 View Post
Better to hoard Jeep technical info than old newspapers and the neighbor's mail, I guess.......
Vote for the August Cherokee Of The Month here - Yes YOU!!!
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