Re: Best 4.0 combo

["Jim Blair" <carnuck@xxxxxxxxxxx>]

A: XJ and MJ fans are offset. The one in my '93 ZJ is centered (didn't know 
till I just looked) and of course TJs are centered. I used TJ parts (off a 4 
cyl) to put a centered pump on an XJ 4.0L in my '84 J10 (then I had to pull 
that motor for my XJ) ZJ and XJ/MJ rads do NOT interchange I found. (they 
might with a torch and some work plus the lower bracket from the XJ)
   I'm running a CJ V8 conversion rad (thanks to http://radiatorbarn.com for 
the hookup!) in my '84 J10 (originally a 6 cyl rig) and using a fan shroud 
off another 6 cyl FSJ.


From: farna@xxxxxxx
Subject: Re: Best 4.0 combo
To: mail@xxxxxxxxxxxx
Message-ID: <ADVANCES62ednHM3SOl00000060@xxxxxxxxxxxxxxxxxxxxxxx>

On August 16, 2005 Frank Swygert wrote:

> 96+ from a XJ Cherokee, since it's a five speed most likely a Cherokee 
> Sport. DO NOT get one from a Grand Cherokee, or from one of the fancier XJ 
> Cherokees with the security device.
<SNIP>

Jim, I failed to mention a Wrangler engine! I forgot about the fan ebing 
offset in the XJ, don't recall if it is or not in the GC. Changing the water 
pump, fan, pulley, and belt is easy enough, though I'd use an electric fan 
(as I do). While your in the junkyard look for a Ford Taurus with a two 
speed electric fan. I found mine in a 94, but later 96+ "jelly bean" types 
may use it also -- easy to spot, they use a three wire connector. The fan 
integrated fan shroud is about the right size, but will need to be modified 
(20% or so cut away, two new holes drilled for through radiator mounts).

While working on the wife's car I discovered another junkyard fan source 
that fits more readily, but will be harder to find. The fan and shroud from 
a Volvo 960 (2.9L six, sometimes called 3.0L). It's a big enough fan (~16") 
to amply cool the 4.0L and draws enough air, and the shroud is pretty big. 
Shroud will need less modifying to fit an AMC, so if you see one in a 
junkyard nab the fan quick! Not sure if other Volvos would work, but thake a 
look at 850 (2.4L five cylinder) fans, they may be nearly the same as the 
960. Don't let the small size of the engines fool you -- they turn higher 
rpm than the 4.0L and therefore create just as much (maybe more) heat. 
Ratings on the 2.9L six are 201 hp @ 6000, 2.4L five 190 hp @ 5100 rpm or 
168 hp @ 6200 rpm (depending on model). My 4.6L cruises at ~2400 rpm @ 75 
mph, the 2.9L ~3200 rpm @ 75 mph. Heat output should be near the same.