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Unread 12-26-2007, 09:02 AM   #31
supraman1990
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Here is one if your going with an automatic
http://www.hesco.us/shop.asp?action=...116&catId=7974
And here is what you use with a manual tranny
http://www.hesco.us/shop.asp?action=...025&catId=7974

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Unread 01-29-2008, 07:11 PM   #32
ndigilio3
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throttle cable???

what did you guys use for a throttle cable?? hesco has one, but everything they sell is overpriced. i would think one from a 4.0 ho wrangler would work...


thanks in advance... nick
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Unread 01-29-2008, 07:27 PM   #33
supraman1990
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Yeah, the wrangler one will work just fine. You can also use a Cherokee one, but you have to shorten it.
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Unread 02-01-2008, 05:47 PM   #34
Clutch33
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Hey I'm the new guy. I've got a good 4.0 head on the shelf. This week a customer is dropping off a cherokee with a bad head and good lower end. He got a deal on a used engine so he wants a whole engine in his XJ.
This is good for me because I've got a CJ5, and have never been happy with the carbs on these.
If I go with just a head swap on the 4.2 what do I do for a crank signal. The Hesco retrofit doesn't go with a 75 258. I only think of it because the 258 is very fresh, and I don't know the condition of the 4.0 short block that's coming in.
Any help would be greatly appreciated.
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Unread 02-02-2008, 08:12 AM   #35
supraman1990
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What kind of transmission do you have? A T15 or a T150? You might be just as easily off retrofitting your bell housing and running the CPS in it like factory.
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Unread 02-02-2008, 06:29 PM   #36
kconnor123
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Hey Supraman, nice thread.

I've kinda been bitten by the same 4.0 MPI swap bug you have and have been thinking about this for a while now. I similarly have a tired out 4.2 and want to at least rebuild the sucker, but then i was thinking as long as i'm rebuilding why don't i just add fuel injection(i have no vintage loyalty to the carburetor), so hence i'm in the same boat.

My question is which would be cheaper, even though i'll probably do the MPI either way.

Option 1 - Rebuild the existing 4.2, and in doing so add a howell TBI kit to it. I figure if your doing most work yourself and a machine shop do the block it would be around $700-900 for the block work and another 1300 for the howell kit. So around 2 grand?

Option 2 - Find a junked Cherokee from 91-96 (OBD1) and swap out the 4.0 HO engine and have it rebuilt, and then do the 4.0 swap as you've written about. I figure that a junked cherokee will be around $500-900 bucks then the rebuild would be around $700-1000. Then there is the predicament of whether or not to use an extremely overpriced Hesco harness? That sucker is like 500 bones itself. That would put you at about 2 grand not using the hesco and $2500 with the harness.

So its about the same for either type of rebuild but with the 4.0 you are going to get the HO engine which makes ~190hp (?) and the 4.2 only gets about 130hp without mods right? Plus you get MPI with the 4.0 and only TBI with the 4.2. I think its a no brainer to go with the 4.0 swap over a 4.2 rebuild with TBI.

Anyone elses thoughts on this? Did i screw up my breakdown above? Thanks!
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1978 CJ7 I6, 2.5" dik cepek spring lift, 0.5" shackle lift, Cooper Discoverer S/T 33's, 1.25" Wheel Spacers.
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Whats Next: Wide track swap, winch, new seats, eventually a 4.0 mpi swap from a 90's cherokee or wrangler.
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Unread 02-23-2008, 07:22 PM   #37
gkarter65
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it does work

i have a 86 cj7... i have the 4.2 in there. I was worn out.. So my uncle had a4.0 out of a wrangler.... i bought it for a 100 dollars it had only 43,000... the reason why i got it so cheap was the dude fliped his jeep and my uncle bought it for a good deal... anyways... i put the 4.0 in there i though i would have a hard time getting it to work.... well what i had to do was i didnt have the computer to use the fuel injection.. so i used the my 4.2 intake and the 4.0 exhaust.... (the 4.2 exhaust will not work on the 4.0)... We used the disturbior,power steering,alternater,coil on the 4.0.... We had to do some cutting in the intake.... at the time i need my truck running.... other than that everything worked out fine... i just hate the carter carb it sucks.... Recently the number 4 piston skirt broke so im had to buy a piston and rod kit.... I have the jeep to run flawless.. I have been having trouble with the carb. So i call clifford performance they have the right intake for the 4.0 which is a intake for a carb.. it is very pricey but im going to get it and a header... im putting a holley 4 barrel 350 or 390 carb....but when you buy the intake from clifford you have to buy the cam kit.... if you need to know why you have to buy it ill explain it.... so the total price for the cam kit,header,intake,carb, and other parts are close to 1020 dollors...if you have any question e-mail me.....
Gkarter65@aol.com

Preston
jeep cj7 86 4.2 to 4.0 conversion
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Unread 02-23-2008, 09:42 PM   #38
supraman1990
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Quote:
Originally Posted by kconnor123 View Post
Hey Supraman, nice thread.

I've kinda been bitten by the same 4.0 MPI swap bug you have and have been thinking about this for a while now. I similarly have a tired out 4.2 and want to at least rebuild the sucker, but then i was thinking as long as i'm rebuilding why don't i just add fuel injection(i have no vintage loyalty to the carburetor), so hence i'm in the same boat.

My question is which would be cheaper, even though i'll probably do the MPI either way.

Option 1 - Rebuild the existing 4.2, and in doing so add a howell TBI kit to it. I figure if your doing most work yourself and a machine shop do the block it would be around $700-900 for the block work and another 1300 for the howell kit. So around 2 grand?

Option 2 - Find a junked Cherokee from 91-96 (OBD1) and swap out the 4.0 HO engine and have it rebuilt, and then do the 4.0 swap as you've written about. I figure that a junked cherokee will be around $500-900 bucks then the rebuild would be around $700-1000. Then there is the predicament of whether or not to use an extremely overpriced Hesco harness? That sucker is like 500 bones itself. That would put you at about 2 grand not using the hesco and $2500 with the harness.

So its about the same for either type of rebuild but with the 4.0 you are going to get the HO engine which makes ~190hp (?) and the 4.2 only gets about 130hp without mods right? Plus you get MPI with the 4.0 and only TBI with the 4.2. I think its a no brainer to go with the 4.0 swap over a 4.2 rebuild with TBI.

Anyone elses thoughts on this? Did i screw up my breakdown above? Thanks!
I'd go with a 3rd option you haven't said. Find an XJ in a you pull it type yard and get the engine as well as the harness. Then thin your harness and piece together the rest of your swap. Thats the way I did it and I'm in roughly $600 with a 111K engine
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Unread 03-10-2008, 05:58 PM   #39
wirsima
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Engine Mounting Problem

I'm repowering from a 1982 4.2L to a 2004 4.0L and seem to have a slight problems with the engine mounts. My 1982 block on the driver side has the top boss that is not in the same vertical plane as the other 2 bottom bosses. The 2004 4.0L block has all 3 bosses on the same vertical plane. Do I have to machine the top boss down (about 1/2 to match my old block)? or is there another mounting bracket I can use?
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Unread 03-10-2008, 07:27 PM   #40
supraman1990
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Hmm, do you have a pic of your issue? I think you might be using the wrong bolt hole. As I recall the odd hole is on the drivers side. YOu have to use a hole that wasn't occupied by a 4.0 bolt, it is an 18MM metric to the best of my recollection. Take a pic of your drivers side and put it in here and I'll look.
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Unread 03-11-2008, 12:17 PM   #41
crownsey54
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i really want to do this swap. what kind of gas mileage can you get you think. my head on my 258 is bad, so instead of getting a new one i was going to swap in a 4.0.
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Unread 03-11-2008, 12:25 PM   #42
supraman1990
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Well, better than a carbed 258. My conservative estimate is that I'll get around 16MPG with an AX15 5spd. Mine still isn't on the road yet(few more weeks, thank god), but when it goes on I plan on checking the mileage after I get out of my WOT playing with it phase.
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Unread 03-11-2008, 04:03 PM   #43
wirsima
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Quote:
Originally Posted by supraman1990 View Post
Hmm, do you have a pic of your issue? I think you might be using the wrong bolt hole. As I recall the odd hole is on the drivers side. YOu have to use a hole that wasn't occupied by a 4.0 bolt, it is an 18MM metric to the best of my recollection. Take a pic of your drivers side and put it in here and I'll look.
Here are my pics:
[IMG]C:\Documents and Settings\Parents\Desktop\40block.bmp[/IMG]
[IMG]C:\Documents and Settings\Parents\Desktop\42block.bmp[/IMG]
[IMG]C:\Documents and Settings\Parents\Desktop\40block.bmp[/IMG]
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Unread 03-11-2008, 04:05 PM   #44
LSUtiger
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you need 50 posts to show pics. Go to photobucket.com and load them in and post links.
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Unread 03-11-2008, 04:40 PM   #45
wirsima
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Okay, I have 3 images availabe, can I email them to you?... how else can I share them?
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