2003 KJ 3.7 engine replacement

Discussion in 'How To' started by Steven Renich, Oct 25, 2020.

  1. Steven Renich

    Steven Renich New Member

    Messages:
    2
    Likes Received:
    0
    Joined:
    Oct 25, 2020
    I am replacing the engine on my 2003 Liberty. It is the 3.7. I started on it today and got the wiring and the intake off of the engine. I have a couple of questions.


    1) Lifting:
    What is a good point to attach a chain in the back of the engine? In the front, there are mounting holes for the alternator and AC compressor. These are larger and on either side. I the back all I see is the small bolt holes for the intake.

    2) Fuel line:
    The repair manual makes a point of saying that the fuel line does not need to be disconnected "NOTE: It is not necessary to release the quick connect fitting from the fuel supply line for engine removal." (emphasis original)
    Is there a reason not to disconnect this line? Is there a tool needed?
     
  2. Billwill

    Billwill Full Access Member

    Messages:
    1,759
    Likes Received:
    284
    Joined:
    Nov 26, 2009
    Location:
    White River, South Africa
    What year is the donor engine?

    You have to be aware that Tone Rings may have to be replaced at the same time.

    I believe that 2002, 2003 and 2004 motors may be fitted no problem but if you want to fit 2005 upwards there is a problem.

    I will leave this to the 3.7 gasser experts who will give you other advice as well.;)
     
  3. Steven Renich

    Steven Renich New Member

    Messages:
    2
    Likes Received:
    0
    Joined:
    Oct 25, 2020
    BillWill - Good point about the tone rings.

    I should have mentioned that I have done some basic research including getting the factory service manual and reading TwoBobsKJ's engine swap thread (lots of good jnfo there).

    I have also read conflicting reports of which model/year has which computer. For the KJ I have read that all 04 models have the JTEC, and I also read that later 04 models switched to NGC. I am planning on using a junkyard engine and checking which computer the car has. I think that all 3.7's with the JTEC have a three plug PCM and a TCM. The NGC has a four plug PCM and no TCM (the transmission function is done in the PCM). Can anyone verify or correct this?