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Unread 02-01-2013, 09:32 PM   #1
Thejim42
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87 comanche amc to chrysler 4.0 swap

I have a 1987 jeep comanche pioneer that is in amazing shape. It originally had a 4.0 straight 6 with a 5 speed trans 2wd short bed. My uncle gave me this truck as a project but it has no engine. What would it take to put a chrysler 4.0 in place of the original renix 4.0. anyone have any information or has anyone done this?

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Unread 02-02-2013, 09:10 PM   #2
cruiser54
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By Chrysler I think you're referring to 91 and later HO?

Here's how. Easy.

Cruiser’s HO into Renix Swap

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 can’t be overcome very easily.

Any HO engine from an XJ or ZJ through 1998 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. You’ll 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 driver’s side of the block, closest to the front, which needs to be removed so your Coolant Temp Sensor can be installed in it’s 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 driver’s side of the engine about mid way, all the blocks I’ve seen are threaded for it. If not, I’ve heard they may be drilled but not tapped. Tap the hole if that’s the case.


Revised 07/24/2012
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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
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 02-03-2013, 06:55 AM   #3
cruiser54
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This may help you, too:

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
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 03-03-2013, 12:03 PM   #4
Thejim42
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Could i put the renix in place of the HO in a 92 wrangler?
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Unread 03-03-2013, 12:44 PM   #5
cruiser54
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Quote:
Originally Posted by Thejim42 View Post
Could i put the renix in place of the HO in a 92 wrangler?
Yes. As long as you use all the stuff that is on your Wrangler longblock. Use the intake/exhaust gasket for the Wrangler engine.
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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
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 03-03-2013, 12:53 PM   #6
Thejim42
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Jut the intake and exhaust?
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Unread 03-03-2013, 01:07 PM   #7
cruiser54
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Quote:
Originally Posted by Thejim42 View Post
Jut the intake and exhaust?
No. You have to swap the distributor, flywheel, intake and exhaust manifolds,valve cover etc. also. I was just specifying and clarifying which gasket to use when going from HO to Renix.
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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
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 03-03-2013, 01:13 PM   #8
Thejim42
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Ok...sounds like a headache
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Unread 03-03-2013, 01:25 PM   #9
cruiser54
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Quote:
Originally Posted by Thejim42 View Post
Ok...sounds like a headache
Really? You'd have to swap all that stuff over if you got another Wrangler engine. Is it possible that either one is above your skill level?
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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
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 03-03-2013, 01:34 PM   #10
Thejim42
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If i got the same year wrangler engine for the wrangler why would i need to swap everything?
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Unread 03-03-2013, 01:35 PM   #11
Thejim42
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I have never messed with anything where i would need to remove timing components
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Unread 03-03-2013, 01:46 PM   #12
cruiser54
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Well, it seems to me you've got this all figured out then.
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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
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 03-03-2013, 01:53 PM   #13
Thejim42
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Its just easier to get ahold of an H.O than a renix
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Unread 03-03-2013, 01:57 PM   #14
cruiser54
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Quote:
Originally Posted by Thejim42 View Post
Its just easier to get ahold of an H.O than a renix
Hope you're a wiz at wiring..........
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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
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 03-03-2013, 02:05 PM   #15
Thejim42
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How much of a headache is it to change a wiring harness?
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