1998 Wrangler TJ 4.0 motor in a 2001 Wrangler TJ - JeepForum.com

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post #1 of 31 Old 05-05-2011, 04:59 PM Thread Starter
zachzuke24
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1998 Wrangler TJ 4.0 motor in a 2001 Wrangler TJ

I have a 2001 Wrangler TJ Sahara with a 4.0 in it that blew up. I found a good deal on a 4.0 from a 1998 TJ. I figured they would be a direct swap, turns out they are quite different. The power steering will bolt on, and I have the alternator for the 98. As far as I can tell, all I need to get is an A/C compressor from a 98 and A/C hoses from a 98. I don't know if the condensers are different, and I don't know if the driers are different. The intake, coil rail, and camshaft synchronizer bolt right on. Has anyone done this before? Or can anyone tell me if I'm missing something, or if this just plain won't work? Thank-you in advance!

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post #2 of 31 Old 05-05-2011, 05:16 PM
Robert J. yates
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You will need to run the complete 98 accessory drive as the late model block has bosses to support the late model accessory drive that the 98 does not have. As you have found, the power steering, ac and water pump are different.

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post #3 of 31 Old 05-05-2011, 05:51 PM
Knuckelhead
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How could the coil rail bolt right on, there's nothing to bolt it to?...IIRC
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post #4 of 31 Old 05-05-2011, 07:22 PM Thread Starter
zachzuke24
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Quote:
Originally Posted by Robert J. yates View Post
You will need to run the complete 98 accessory drive as the late model block has bosses to support the late model accessory drive that the 98 does not have. As you have found, the power steering, ac and water pump are different.
yeah, i have all the '98 accessories that i can use....

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How could the coil rail bolt right on, there's nothing to bolt it to?...IIRC
it doesn't bolt right on, i have to make some quick brackets for it....the valve cover studs line right up with the holes in the coil rail. but nothing is in the way and it lines up with the spark plugs.
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post #5 of 31 Old 05-05-2011, 07:53 PM
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Quote:
Originally Posted by zachzuke24 View Post
The intake, coil rail, and camshaft synchronizer bolt right on.
Quote:
Originally Posted by Knuckelhead View Post
How could the coil rail bolt right on, there's nothing to bolt it to?...IIRC
Quote:
Originally Posted by zachzuke24 View Post
it doesn't bolt right on, i have to make some quick brackets for it....the valve cover studs line right up with the holes in the coil rail. but nothing is in the way and it lines up with the spark plugs.
Lets see some pictures...
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post #6 of 31 Old 05-05-2011, 08:27 PM Thread Starter
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I did not take pics with the rail on, but I am going up to the barn where the jeep is at tomorrow, and I will take pics then. here is the pics I took after I finished grinding and painting the block


(i sill need to paint the valve cover :P)
and here is a pic of the coil rail i found on google
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post #7 of 31 Old 05-11-2011, 07:19 PM Thread Starter
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finally got back up there and finished cleaning and painting the motor. here is a picture with the coil rail sitting on the plugs....

and the brackets have been made, but I forgot to take a picture of them. tomorrow (thursday) I am going back up there and hopefully putting the motor in....
had to get an A/C clutch pulley from the junkyard so that I didnt have to get a different belt. hopefully I will be able to afford to get a 1998 A/C system not too far in the future. anyone happen to have one and live in NH?
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post #8 of 31 Old 05-12-2011, 12:55 PM
Robert J. yates
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Quote:
Originally Posted by Knuckelhead View Post
Lets see some pictures...
LOL... I guess it worked for him

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post #9 of 31 Old 05-12-2011, 06:53 PM
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Quote:
Originally Posted by zachzuke24 View Post
and the brackets have been made, but I forgot to take a picture of them. tomorrow (thursday) I am going back up there and hopefully putting the motor in....
Got those mounting bracket pictures?...
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post #10 of 31 Old 05-12-2011, 07:19 PM
jeepwrangler97
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I have a 01 block in my 97, but it's a PITA to get everything swapped over, I am running the 97 accessories, but I had to make a bracket to mount the coil for mine. If this had been a year ago we could have swapped all of our accessories
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post #11 of 31 Old 05-12-2011, 09:25 PM Thread Starter
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timing is always my specialty
got the brackets made....

they seem to hold fine, the coil rail doesn't wiggle at all

then again, ill let you know when its running lol....

got the motor in and bolted to the transmission...now to hook up the 500 wires to make it work...

now the plan is to have it running friday...well see how that goes lol
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post #12 of 31 Old 05-12-2011, 10:14 PM
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Quote:
Originally Posted by zachzuke24 View Post
timing is always my specialty
got the brackets made....
now the plan is to have it running friday...well see how that goes lol
You've been busy.

Keep the pictures comming...
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post #13 of 31 Old 05-18-2011, 09:06 PM Thread Starter
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Been workin on the jeep little by little, got everything together except the driver's side fender (due to some bodywork it needs). The only thing that mounts on the driver's side fender is something we like to call "pigs in space", but I think the technical term for it is the evap control unit....since this is a california jeep it has a bunch of extra eco-friendly additions. Anyways, we hooked up the "pigs in space" and held it in place and tried to start it. It just cranked over and after a few seconds of cranking the "check gauges" light comes on. Then goes off when I stop cranking. Still wont start....We think the "pigs in space" has to be grounded to the fender so we will try that thursday. Almost a week later and still not running.... I have a OBDII reader that I can plug into my computer, and when I plugged it in it did not say anything was wrong.
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post #14 of 31 Old 05-21-2011, 10:30 AM Thread Starter
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Well, I grounded the "pigs in space" and it still didn't start. But I did notice that as soon as I turn the key on 1 click it blows the fuse for the injectors....not sure whats going on there but it is a clue....

and I couldn't help but paint the grille black when it was off

sorry about the blurry pictures...not sure what was going on with my camera....
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post #15 of 31 Old 06-04-2011, 07:11 AM Thread Starter
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Still not sure why the injector fuse blows when I turn the key, but I did some searching on the internet and it looks like the asd relay might have something to do with it. I looked everywhere for damaged wires, I unplugged injectors, and nothing changed. I bought a couple packs of fuses so that I can keep trying different things....any ideas? Its gone too far to give up now....
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