2002 Jeep Liberty 3.7L Engine Swap to newer 2004 engine - JeepForum.com
 
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post #1 of 12 Old 06-25-2009, 10:45 AM Thread Starter
1SickWS6
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2002 Jeep Liberty 3.7L Engine Swap to newer 2004 engine

Okay, this is driving me nuts! I have a 2002 Jeep liberty with a blown 3.7L engine. I am going to replace it, but am having trouble finding a 02/03 engine around here locally. I find plenty of 04/05/06 3.7 engines and was wondering if I would be able to drop one of those in? I understand they have different crank reluctor wheels and possibly cam reluctor wheels. I was thinking of putting a 04 engine in and then also swap my PCM for a newer 2004 PCM with the later engine tune that should be calibrated for the 04 engine. Does anyone have any knowledge if this should work? I would expect the wiring harnesses to be the same between the 02 and 04 engines and would think everything would just bolt right up and fire up. Any input would be greatly appreciated, thanks!

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post #2 of 12 Old 06-26-2009, 05:12 PM
iluvtruenos
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Basically, all engines are mechanically identical (Your 1976 Chevy 350 V8 and 1999 Toyota Corolla I4 all work the same) You can do it, but you must make both motors identical, this may include swapping sensors, tone rings, and other stuff like that.

It can be done though.

My Jeep is a chick magnet with reverse polarity.

Rampant Pack of Retards group president.
2000 WJ, 4.5l, AX15, 242 D60/14b, 5.5" lift front, 7.5" rear. Ford Expedition rear coils, Ram 350 shocks, JKS, IRO Long Arms, cool Badlands flag thingy.
1987 XJ - Gone but not forgotten
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post #3 of 12 Old 07-01-2009, 06:51 PM
nubby
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DONT DO IT..................i tried an 04 3.7 in an 03 liberty.....after a month still trying to figure out how to make it work........
for example, had to swap the crankshaft, all sensors, injectors and it still doesnt run right. and modifying the pcm info doesnt work right either
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post #4 of 12 Old 07-01-2009, 10:54 PM
iluvtruenos
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Ohh! The dreaded tone ring issue. 1999-2001 4.7 V8's had 16 teeth tone rings, and 2002-2004 had 32.

I hear your pain.

Just swap those two out, and use all the old electronics.

My Jeep is a chick magnet with reverse polarity.

Rampant Pack of Retards group president.
2000 WJ, 4.5l, AX15, 242 D60/14b, 5.5" lift front, 7.5" rear. Ford Expedition rear coils, Ram 350 shocks, JKS, IRO Long Arms, cool Badlands flag thingy.
1987 XJ - Gone but not forgotten
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post #5 of 12 Old 08-09-2012, 10:31 PM
old45b
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Easy fix

This is actually an easy fix.

When you change out to a newer motor, you have to do a few things to make it work.

1.Change the reluctor to the original one from your vehicle.
2.Change the cam sensor to the original one.
3. make and install an egr block off plate if yours did not have one.
4. Use the original instake and connectors if different.

I did this to my 2003 Liberty to a 2007 motor and it worked perfectly.
Drives like a new car and I now have 2000+ miles on my swap.

Good luck and good driving. You will enjoy your Liberty.
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post #6 of 12 Old 01-14-2013, 06:14 PM
tommxxx
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hi i am also looking to put a 2004 3.7 Liberty motor in my 2002 Liberty it is also a 3.7 so all i need to do Change the reluctor,cam sensor, install an egr block off plate original one from the 02.
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post #7 of 12 Old 04-09-2013, 11:07 AM
Griff1918
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Now how involved is this swap? Do I have to pull the crank shaft to do the swap?
Because if it is super involved I just get a remaned engine and have all new inners.
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post #8 of 12 Old 04-09-2013, 11:16 AM
tjkj2002
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Quote:
Originally Posted by Griff1918 View Post
Now how involved is this swap? Do I have to pull the crank shaft to do the swap?
Because if it is super involved I just get a remaned engine and have all new inners.
You will have to pull tha oil pan off and the valve covers,not 100% sure if the crank has to be removed though.It's a pretty involved job,not hard just takes some time.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #9 of 12 Old 12-20-2015, 12:32 PM
jeepguy810
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Engine Swap

Hi Guys.
I have a 2002 Liberty that blew up. So i bought a 04 Motor. I swapped the toner rings and camshaft rings. Did complete rebuild on the 04 motor in the processes. The problem I am having right now is the torque converter and the crankshaft. I did not swap the crankshaft from the 04 to the 02. I am using the 04 crankshaft. The rear frange is too small on the 04 crankshaft. Would it be easier to source a 04 tourque convert instead of swapping the crank itself?
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post #10 of 12 Old 12-20-2015, 01:20 PM
wheelman18
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Sorry Sorry hijack but I blew up my 04 3.7. Is there another year complete engine I can use where I don't have to swap the ring on crank as I don't mind swapping cam toners just don't want to open the bottom of a good engine
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post #11 of 12 Old 02-22-2016, 06:31 AM
halocorps
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hi i was wondering if it is at all possible to swap out the jeep 3.7 for a dodge 3.3l i've been thinking about doing this for a while now because the liberty i have has 215,568 on it and im afraid that at some point it will throw a piston threw the motor so i was just wondering if it was at all possible.
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post #12 of 12 Old 02-24-2016, 12:44 PM
BrokeWJ
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3.2, 3.3, 3.5, 3.6, 3.8 won't work easily- swap won't be easier than 4.7 or even 5.7 late model Dodge/Jeep motors. If it's got some serious noise to it there'd be some cause for concern but honestly- even these motors see over 400k fine. If it runs good and you stay on top of small serious issues while they're small it should last great. (like rad leaking, fan clutch dying, fan sensor not working, water pump, etc)
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