Another victim of the 2000-2001 Jeep 4.0L cylinder head cracking between cylinders 3 and 4 on the cylinder head. Cracked head has caused many other expensive problems throughout the engine such as (coolant system failure, crankcase bearing failures, oil pump failure, valve stems being warped, etc.) after extensive research and being a part of many online polls this is obviously a problem with Jeep of all models that have the 4.0L inline 6 cylinder heads of these years. The vehicle was in motion when cracked head occurred causing the engine to overheat as well as oil pressure to drop. Also caused malfunction and ruined O2 sensors on vehicle. The cylinder heads in these 2000-2001 Jeep of all models are faulty and it is obvious cause Jeep changed the heads the following year in 2002. They claim that these heads are cracking due to the engine overheating. This particular Jeep has never been overheated in order for it to cause the cylinder head to crack. They are faulty.

- Lincoln, NE, USA

The contact owns a 2001 Jeep Wrangler. The contact stated that the engine overheated several times. The vehicle was taken to a local mechanic where the radiator was replaced twice and the engine seal was also replaced however, the failure was not corrected. The vehicle was taken back to the mechanic, who determined that the engine head gasket was cracked, causing pistons 3 and 4 to fail. In addition, the radiator fluid began to drain abnormally. The vehicle was not repaired. The failure mileage was 136,000 and the current mileage was 148,000...updated 11/28/12 the consumer stated the engine head was cracked. Updated 12/03/12

- Durham , NC, USA