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Home >> Jeep >> 2007 >> Wrangler Rubicon, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 3.8L Engine (Service Information) >> Engine Block >> Bearings-Crankshaft Main >> Standard Procedure >> Crankshaft Bearing Oil Clearance >> PLASTIGAGE Method-Engine Out-Of-Vehicle

PLASTIGAGE Method-Engine Out-Of-Vehicle

Fig 1: Plastigage Placed in Lower Shell
GC0064392Courtesy of CHRYSLER LLC
  1. With engine in the inverted position (crankshaft up) and mounted on a repair stand, remove main journal cap.
  2. Remove oil from journal and bearing shell.
  3. Cut Plastigage (1) to same length as width of the bearing and place it in parallel with the journal axis (1).
  4. Carefully install the main bearing cap and tighten the bolts to specified torque. See SPECIFICATIONS .
    CAUTION: Do not rotate crankshaft or the Plastigage will be smeared.
  5. Carefully remove the bearing cap and measure the width of the Plastigage (1) at the widest part using the scale on the Plastigage package. Refer to Engine Specifications for proper clearances. See SPECIFICATIONS . If the clearance exceeds the specified limits, replace the main bearing(s) with the appropriate size, and if necessary, have the crankshaft machined to next undersize.
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