This repair manual covers 1987-2017 Jeep Wrangler models, with gasoline engines, including 2.4L and 2.5L inline four-cylinder, 4.0L and 4.2L inline six-cylinder, and 3.8L V6 engines.
Note: This manual does not provide diesel engine information.
Book Excerpt: 1987-2017 Jeep Wrangler Repair Manual
MAIN AND CONNECTING ROD BEARINGS: INSPECTION
Refer to illustration 19.1
- Even though the main and connecting rod bearings should be replaced with new ones during the engine overhaul, the old bearings should be retained for close examination, as they may reveal valuable information about the condition of the engine (see illustration).
- Bearing failure occurs because of lack of lubrication, the presence of dirt or other foreign particles, overloading the engine and corrosion. Regardless of the cause of bearing failure, it must be corrected before the engine is reassembled to prevent it from happening again.
- When examining the bearings, remove them from the engine block, the main bearing caps, the connecting rods and the rod caps and lay them out on a clean surface in the same general position as their location in the engine. This will enable you to match any bearing problems with the corresponding crankshaft journal.
Subject: 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017