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Home >> Jeep >> 1988 >> Comanche Eliminator, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 4.0L 6-CYL - VIN [M] & 4.2L 6-CYL - VIN [C] >> Removal & Installation >> Main Bearing >> Installation

Main Bearing: Installation

  1. Note color code on edge of bearings removed. Install bearings. Ensure caps are installed in original location with arrow on cap facing toward front of engine. Using Plastigage method, check bearing clearances.
  2. Replace bearings as necessary to obtain correct clearance. Bearings are available in standard and undersize applications. If required, different sized upper and lower bearings may be installed to obtain correct oil clearance.
    NOTE: If different sized bearings are used, odd sized bearings must all be uniform in location (upper or lower). DO NOT use bearings with a thickness difference exceeding .001" (.02 mm).
  3. Tighten bolts to specification. Check crankshaft end play. See CRANKSHAFT END PLAY in this article. Rotate crankshaft to ensure freedom of movement. Reverse removal procedure for remaining components. Tighten bolts to specification.
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