What is the proper main bearing installation procedure for Chrysler Hemi engines?
The AERA Technical Committee offers the following information regarding crankshaft main bearing installation procedures for 2003-’06 DaimlerChrysler 5.7L and 6.1L Hemi engines. This procedure is for crankshafts previously removed from the cylinder block. It is important to first clean all of the oil off the main bearing journals. Then, determine the maximum diameter of the journal with a 2″-3″ micrometer. Measure at least at two locations 90° apart at each end of the journal (front to back on crank). The maximum allowable taper is .0004″ (.008 mm) and maximum out of round is .0002″ (.005 mm). Compare the measured diameter with the journal diameter specification (Main Bearing Fitting Chart). Select inserts required to obtain the specified bearing-to-journal clearance. Desired engine oil clearance is .0007″-.0029″ (.020 – .074 mm). The crankshaft main bearings are “select fit” to achieve proper oil clearances. For main bearing selection, the crankshaft counterweight has grade identificat
