I had the advantage to work on my Jeep liberty sport 3.7L v6 for an automotive class. It's surprising how complex yet simple this engine is once you get to know it. :
ATK Engines Replacement 3.7L V6 Engine for 2004 Jeep Liberty KJ | Quadratec
JEEP LIBERTY 3.7L MOTOR ENGINE REBUILT WARRANTY VIN K 2002-2012 DODGE – Jeep Parts Depot
Chrysler PowerTech engine - Wikipedia
JEEP LIBERTY 3.7 ENGINE 103,000 MILES *FREE SHIPPING* COMPLETE OEM 2004 ONLY | eBay
2002 Jeep Liberty Used Engine Cash Discounts Now Applied to Consumer Sales at GotEngines.com