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Home >> Mercury >> 1982 >> LN7 Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engines 1.6 Liter 4-Cylinder >> Crankshaft & Rod Bearings >> Main & Connecting Rod Bearings >> Main Bearings

Main Bearings

  1. Position jack under counterweight adjoining bearing being checked so weight of crankshaft will not compress Plastigage and provide an erroneous reading. With all bearing caps (other than one being checked) tight, check clearances using Plastigage method.
  2. If clearances are excessive, a 0.001" or 0.002" undersize bearing may be used in combination with a standard bearing. If 0.002" undersized bearings are used on more than one journal, they must be positioned in cylinder block rather than bearing cap.
    NOTE: Always replace bearings in pairs. Never use a new bearing in combination with a used bearing.
  3. If standard and 0.002" undersize combinations do not bring bearing clearance within specification limits, crankshaft will have to be refinished and undersized bearings installed.
  4. Remove all upper main bearings by inserting a suitable tool in oil hole of crankshaft journal and rotating crankshaft clockwise to roll bearing from engine. Lubricate new inserts, and insert plain (unnotched) side of block. Rotate bearing into place. install all main bearing caps with arrows pointing to front of engine.
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