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Oldyellar1 06-12-2013 09:47 PM

Engine swap 2001 xj
What is the easiest 4.0 to 4.0 swap for 01 with a cracked head and wiped cam bearings? I want to get away from the 03310331 head, considering swaping for a98 model. Iunderstand in doing this there mods needed to the exhaust and coil mounting.Is there an easier route?

jeepnewbie2000 08-13-2017 01:58 PM

did you ever figure this out? going though same thing with no response to post. i have a 2001 4.0 swapping for a 99 guy has a head off a 98 so im worried. idk where to look for stamps to identify the engine/head either.

75SV1 08-14-2017 09:51 AM

basically, any 96-01 XJ block is a 'direct' swap. The latter '02-up 4.0 heads are suppose to be better. Look for 'TUPY'. As stated in the OP post, the earlier heads, 91-95 and 96-99 would need brackets fabbed for the coil pack.

96-up blocks have dowel locator pins for the head. There are other improvements. Nothing that prevents you from swapping in and earlier block, even a RENIX.

CJ7-Tim 08-14-2017 11:13 AM

Any 1990-2001 XJ Cherokee or ZJ Brand Cherokee engine block will interchange.

The block casting numbers are on the drivers side of the block, and the head casting numbers are in the center of the head on the drivers side.

The easiest swap is to remove and re-use, or replace with new, all the 2001 specific parts. Find a 2002 or newer 0331 TUPY head from a WJ Grand Cherokee.

jeepnewbie2000 08-14-2017 01:20 PM

thanks tim, i see today that my info is wrong. i have a 2000 jgc so its a wj. the motor im looking at is outta a 98 jeep ??? i know the mounts are different but saw online that there are modified mounts available to fix this. if i use a 02 or newer head that fixes the coil mounting holes on the head since the 98 uses a distributor orf make a modified coil mounting bracket of some sort. also i hear if i use my mounting brackets for the front of the motor, i may have to tap the holes but they are there im told/read online, then it will work. is this bs? i can pick up this motor with new top end gaskets for 200 bucks. just need a head. thanks for helping. money is very tight, sons 1st vehicle so i want it right. is this possible ?

CJ7-Tim 08-14-2017 04:07 PM

The swap you are proposing is a significant amount of extra work. Rather than spend all the extra time and extra money, I suggest you find an engine or head that fits properly. WJ's are common as dirt in the junkyards, it shouldn't be hard at all to find a running engine or cylinder head that will bolt in for a reasonable price.

TJ Wrangler and WJ Grand Cherokee 4.0L Engine block castings underwent major design changes effective in the 1999 WJ Grand Cherokee, and 2000 TJ Wrangler. These "S" VIN code engine blocks from a 1999-04 WJ Grand Cherokee and 2000-06 TJ Wrangler are not bolt on interchangeable with any XJ Cherokee or any ZJ Grand Cherokee engine block (nor with any 1997-99 TJ engine block).
The reason why these blocks do not interchange is that the casting design changes relocated numerous bolt holes, altered the physical location of all the fan belt driven accessories, and in some areas eliminated the metal that could be drilled and tapped for the earlier configuration of motor mount bolt holes and fan belt driven accessory mounting bracket bolt holes.

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