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Unread 07-04-2014, 04:31 PM   #1
twh7458
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2002 KJ Liberty 
 
Join Date: Jul 2014
Location: Deshler, Ohio
Posts: 2
Replacing 2002 eigine with 2005, questions...

Hello, I just recently purchased my first jeeps, all Liberties. 3 of them are 2002, 4th is 2004.

The best 2002 I have which is also the wife's has a rod knocking. Long story short I'm told that an engine from a 2004 - 2007 will fit but needs converted? I'm talking about the 3.7 engine. I'm told the difference is the cam sprocket and a plate on the Crank? So my question is this, if I purchase a 2005 Liberty with a good engine, can I use that engine in my 2002 if I also swap the ECM? What all does the ECM control, just the engine? Or should I plan on just converting the engine to work correctly in my 2002?

I appreciate everyone's recommendations!

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Unread 07-04-2014, 05:33 PM   #2
tjkj2002
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Join Date: Dec 2009
Location: Colorado
Posts: 8,146
You will have to change the cam/crank tone rings so the PCM reads them correctly.Not going to make the '05 PCM work in a '02.
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Unread 07-04-2014, 07:46 PM   #3
TwoBobsKJ
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2003 KJ Liberty 
 
Join Date: May 2011
Location: Northern, OH
Posts: 595
You can put a 3.7 up to a 2011 in your '02 - HOWEVER, the only way to do it is just as tjkj2002 said. You have to swap the cam sprocket and the reluctor ring on the end of the crank. The EGR also needs to be blocked.

Here's an overview: http://www.jeepkj.com/forum/f202/eng...verview-53270/

Bob

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Unread 07-04-2014, 09:10 PM   #4
02blue
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Quote:
Originally Posted by TwoBobsKJ View Post
You can put a 3.7 up to a 2011 in your '02 - HOWEVER, the only way to do it is just as tjkj2002 said. You have to swap the cam sprocket and the reluctor ring on the end of the crank. The EGR also needs to be blocked.

Here's an overview: http://www.jeepkj.com/forum/f202/eng...verview-53270/

Bob

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I was waiting for Bob to send the link.
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Unread 07-08-2014, 09:05 PM   #5
twh7458
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2002 KJ Liberty 
 
Join Date: Jul 2014
Location: Deshler, Ohio
Posts: 2
Thanks for the great replies. Pretty much what I expected but wanted to double check just in case. Since my original post I've decided to repair the engine without removing it from the vehicle. This is my first Jeep so it goes slower as I study each move I make. Original problem is #2 dropped a valve seat which then broke the top of the piston exposing the rings. I don't have the proper facilities presently to attempt removing the engine, so I'll fix it in the vehicle. Hopefully tomorrow evening I'll have removed the sub frame exposing the oil pan to allow me to easily work on replacing the piston. I'm not planning to replace any of the bearings, just the #2 piston and rings with standard. I'll reassemble the lower part of the engine along with the rest of the sub frame and such, then reassemble the top end of the motor. I'll be replacing the head with a re-manufactured head. Working on this a few hours each evening, hoping to have the Jeep back together by next weekend.
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2002 , ecm , engine , liberty , swap

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