i did a search and still have a couple questions. i found a 4.0 out of a rolled 97. he wants $1000 but that's not what i would pay. i might offer $500. anyway- are the motor mounts the same? would i need an adapter to my peugeot? he has an automatic. i know the peugoet has a bad rep but it is working for me so far. i imagine i will need an adapter- if so will it change the length any amount to have to change my driveshaft? any other issues you could help me on?

thanks in advance
steve

The motor mounts are fine, the motor bolts up the same to the frame and to your trans. Get the trans with it. Hell if it is a wrangler auto I will trade you my AX15 with a week old center force. You need the trans because you have a crank shaft position sensor that mount on the top driver side of the bell housing, this sensor is your timing. Your other alternative to this is to relocate it to the harmonic balancer on the front of the motor which is pricey. My motor is a 97xj 4.0. Motors that are 96 and newer have a different fuel supply, they have a single line from the tank to the fuel rail because the fuel regulator and return are in the top of the tank. I found a older fuel rail with a regulator and return line and used it. Your jeep already has a fuel line and return line going to the tank hook those up to the fuel rail and get a tank from the junkyard for a 91 to 95 4 or 6 cyl. because you need the fuel pump out of it. I bought the whole tank for $50. If you tell them you want the fuel pump they will charge you more or some junkyards local to me will not sell fuel pumps. My tank looked better than the one from the junkyard so I used my tank and put the fuel sending unit in it from the junkyard tank. A good way to tell you got an electric fuel pump in the tank is the harness. My original had two wires and my elec. fuel pump sending unit has three. Put the motor in and hook up the starter so it will turn over with the key. Then call Benny at Hesco and order a computer and harness. The harness is made to use 94 sensors but some of the 97 will work. I changed some of the cheep sensors and cut the harness and changed it for maybe two other sensors. Good luck. It is the best mod to my jeep.

Get the auto with it !!!
what is the motor and tranny out of YJ or XJ? Either way it a hell of alot better than the peugoet .

thanks to rodney and blitzed :)

well, i could go with the auto tranny, then the wife could finally drive it :)

anyway, so there is more to it than i thought, and i thank you again for going into detail. so i need to get the gas tank also. so, if i understand you correctly, the tank off the 97 won't work? i need a tank for the fuel pump off a 91-95 YJ, 4 or 6 cyl. do you think the elec pump will fit into my tank with no fabrication? i've got a 20 gallon plastic gas tank.

also, would the computer and harness off the subject 97 TJ work, or do i still need to get one from hesco?

i might go ahead with this project. i've got 150,000 on my 4.2. it still runs strong but has a sticky lifter. i tried the auto tranny fluid to try and remedy but that didn't work. it's only a matter of time till it needs an overhaul. seems like the 4.0 would be a way to go. this one has 60,000 on it. what would be a fair price for the engine and tranny? wonder how much cutting in the floor to fit the auto tranny shifter? my NP231 should bolt up to the tranny or will i need an adapter there? will my driveshaft lengths change?



i've never done an engine swap so this is un-charted territory for me. thanks again for your time.

later,steve

at a JYD arround here 60K motors go for 650-800 (should include computer) and yes the computer from the 97 will work.
Tranny's for abour 250-400

thanks redruM :)

so sounds like $1000 for both the engine and tranny would be a fair price. he said he wanted that much for just the engine.

good, so that computer will work. i think rodney might have assumed that i wouldn't get the computer and harness with the doner, right rodney? or am i missing something here?

umm, how about the auto tranny matching up with my NP231? same splines? will the auto tranny be a problem to mount to my skid plate, or should i get the TJ skid also?

what else should i get off the donor TJ?

thanks again guys
steve

Yes I thought you were just getting the motor. I got all the wiring diagrams for the 97xj and for a 94yj. The older (91-94) computer system is much more simple to me than the newer one. The computer does so much more in the late model stuff. For the ease of installation I scraped the 97xj computer and harness and went with the hesco harness, this was after I talked to someone at hesco about using the 97 harness. It cost more than I had expected but I love the fuel injection. It is great to be on steep inclines and it still run no matter what the angle is. Also cold starts, hot starts everything is great. Excellent throttle response. OK I'll shut up.

My 4.2 developed some engine noise after 150K. I tore it apart and everything looked bad. The bearings in the bottom end were scared, there was a nice ridge at the top of the cyclinder. Rather than spend $1500 on a motor than I didn't want I spent $1500 on my 4.0 with 30K miles. After everything it cost me about $2300.

Yes if you get an older style electric pump sending unit it will fit in your exsisting tank, that is what I did.

Sas
One thing to keep in mind when using a '96 and newer motor, they need 42-49 psi of fuel pressure at the fuel rail. They use a one piece fuel pump, sending unit and in tank mounted pressure regulator. The older ('95 and under) used a fuel rail mounted regulator, and the pump put out 32-36 psi. The newer higher pressure pumps will not fit in a standard CJ tank. What other people have done, and I wish I had, was install a '95 or older fuel rail, then use the '89-'91 YJ fuel pump. What I ended up doing is getting aftemarket ($$$) fuel pump, filter and regulator, then having to run custom fuel lines all the way around. A major PITA. Do as much research before you start tearing down. If you go ahead with the swap and have any questions, let me know. I think I've hit every snag possible so far on my swap. Good luck, and may God have mercy on your soul.

Medic is correct. that is why I put an older fuel rail on mine and used the exsisting fuel lines on my YJ. He is correct about a CJ and the tank not working. But the YJ tanks are the same. I unbolted my old sending unit and drop in the one with a fuel pump and it has the 3 wired harness on top. The Hesco harness is very complete and labeled. It starts on one side of the motor and wraps around to the other side then goes over the transmission to the fuel pump. Once the engine was bolted in and the starter was hooked up and working so the motor would turn over. I wired the harness in and it fired up. The older computer and fuel system is alot more simple to me. I don't know too much about the new stuff. I new nothing about fuel injection before I started and now I feel pretty comfortable about it. Don't get discouraged I did all of this by myself so it can be done.

One thing I don't understand is why CJ swaps use the 87-91 fuel pumps. I know 87-90 were throttle body injection which uses less fuel pressure. I am pretty sure that my multi port fuel injection specs are 38-42psi. I have put a gauge on mine and it stays at 40psi. Anyways I am no expert but my rig runs great.

thanks guys

appreciate all the info and advice :)

i offered him $1100 for engine and tranny- he wanted $1500. he countered with $1250 but i held fast to the $1100.

ball is in his court now- haven't heard back soooooooooooo....

there will be more if this one doesn't pan out right? i am truckin just fine on my 4.2 and peugeot currently anyway. just thought itt would be nice to up-grade. maybe i will just rebuild the 4.2 when it craps out and get a NV4500 or a T5 when the peugeot takes a dive.

thanks again
steve