Engine Swap?

[Sleek]

I was wondering if the 4L of a 1993 yj would fit in my 88 mj ? Pretty sure it does but i just wanna make sure befor buying the yj lol

[cruiser54]

Yes. Here's how:

 

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 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. 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 03/28/13

[cruiser54]

By the way, welcome to Comanche Club.

 

When you get a chance, click on the link in my signature below for some headache saving tips for your Renix MJ. 

[onlyinajeep726]

It should, just pay close attention to how the motor mounts are bolted to the engine and also the accessory mounting points.  I know that TJ blocks will not directly interchange between XJ/MJ/ZJ.

[cruiser54]

It WILL fit.

 

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)

[jpnjim]

Use the MJ engine brackets

the YJ brackets actually offset the engine in the engine bay to to

he opposite side.

And use the MJ 90 degree oil filter adapter

the YJ filter comes straight off the side of the block.

You can use the standard thread YJ screw in adapter with the MJ 90* mount if you choose to ditch the funky metric filter of the Renix and go with a conventional filter.

 

I did my 92'YJ 4.0L into 88'MJ 4.0L swap a little differently than Cruiser (the hard way?)

details are in the Trail MJ build thread in my sig below

[Sleek]

Cool thanks for all the advice il keep the old yj for a spare engine