Fig. 119: CONNECTING ROD BEARING CLEARANCE
Courtesy of CHRYSLER LLC
The connecting rod bearing clearances can be determined by use of Plastigage or the equivalent. The following
is the recommended procedure for the use of Plastigage:
1. Rotate the crankshaft until the connecting rod to be checked is at the bottom of its stroke.
2. Remove oil film from surface to be checked. Plastigage is soluble in oil.
3. Place a piece of Plastigage across the entire width of the bearing shell in the bearing cap approximately
6.35 mm (1/4 in.) off center and away from the oil hole. In addition, suspect areas can be checked by
placing Plastigage in that area.
4. Assemble the rod cap with Plastigage in place. Tighten the rod cap to the specified torque.
Do not rotate
the crankshaft while assembling the cap or the Plastigage may be smeared, giving inaccurate
results.
5. Remove the bearing cap and compare the width of the flattened Plastigage with the scale provided on the
package. Locate the band closest to the same width. This band indicates the amount of oil clearance.
Differences in readings between the ends indicate the amount of taper present. Record all readings taken.
See
Engine - Specifications
.
Plastigage generally is accompanied by two scales. One scale is in
inches, the other is a metric scale. If the bearing clearance exceeds wear limit specification, replace
the bearing.
BEARING(S), CRANKSHAFT, MAIN
Standard Procedure - MAIN BEARING FITTING
2010 Jeep Wrangler Sport
2010 ENGINE 3.8L - Service Information - Wrangler
viernes, 1 de octubre de 2021 05:18:31 p. m.
Page 93
© 2011 Mitchell Repair Information Company, LLC.
