Fig. 122: Plastigage Placed in Lower Shell
Courtesy of CHRYSLER LLC
Inspect the crankshaft bearing journals.
Engine crankshaft bearing clearances can be determined by use of Plastigage (1) or the equivalent. The
following is the recommended procedures for the use of Plastigage with the engine in the vehicle or engine on a
repair stand.
PLASTIGAGE METHOD-ENGINE IN-VEHICLE
1. Preferred method:
a. Shim the bearings adjacent to the bearing to be checked in order to remove the clearance between
upper bearing shell and the crankshaft. This can be accomplished by placing a minimum of 0.254
mm (0.010 in.) shim (e. g. cardboard, matchbook cover, etc.) between the bearing shell and the
bearing cap on the adjacent bearings and tightening bolts to 14-20 N.m (10-15 ft. lbs.).
a. When checking #1 main bearing shim #2 main bearing.
b. When checking #2 main bearing shim #1 AND #3 main bearing.
c. When checking #3 main bearing shim #2 AND #4 main bearing.
d. When checking #4 main bearing shim #3 main bearing.
NOTE:
The total clearance of the main bearings can only be determined with the engine
in the vehicle by removing the weight of the crankshaft. This can be
accomplished by either of two following methods:
NOTE:
Remove all shims before reassembling engine.
2010 Jeep Wrangler Sport
2010 ENGINE 3.8L - Service Information - Wrangler
viernes, 1 de octubre de 2021 05:18:31 p. m.
Page 95
© 2011 Mitchell Repair Information Company, LLC.
