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Home >> Mercury >> 1993 >> Capri Base, Standard >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 1.3L 4-CYL - VIN [H] & 1.6L 4-CYL DOHC - VINS [Z,6] >> Overhaul >> Cylinder Block Assembly >> Crankshaft & Main Bearings

Crankshaft & Main Bearings

  1. Drain oil and remove oil pan. Ensure main bearing caps are marked for installation to original location and position.
    NOTE: If replacing bearing inserts with engine in vehicle, remove one bearing at a time for measurement or replacement.
  2. Remove main bearing cap bolts. Remove cap and lower bearing insert. Use bearing remover or fabricated cotter key to remove upper bearing insert. Insert bearing remover in journal lubrication hole. Rotate crankshaft in normal direction of operation only. Repeat procedure for remaining main bearings.
  3. Check bearings for abnormal wear. Check crankshaft for grooves, scratches and pitting. Use Plastigage to check clearance of main bearings-to-crankshaft. Always keep at least 2 main bearings and caps tight during clearance check. See, in the end of this article, CRANKSHAFT MAIN & CONNECTING ROD BEARINGS  table under ENGINE SPECIFICATIONS.
  4. Lubricate and install new bearings in cap and block. Match bearing tangs with notch in cap and block. Position cap in its proper location and position. Install cap bolts and tighten to specification. See TORQUE SPECIFICATIONS TABLE  at the end of this article. Repeat procedure for remaining main bearings.
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