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Crankshaft & Main Bearings

  1. Ensure main bearing caps are numbered for location. Ensure main bearing journal is within specification. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS  table under ENGINE SPECIFICATIONS. Position crankshaft on "V" blocks. Using a dial indicator, check crankshaft runout. If runout is not within specification, replace crankshaft.
  2. If any bearing clearance cannot be adjusted to standard specification, grind crankshaft and use undersize bearings. Tighten main bearing cap bolts in sequence to specification. See Fig 1. See TORQUE SPECIFICATIONS  table.
    NOTE: Probe main bearing caps are numbered 1-5. Arrow on cap points toward front of engine.
    Fig 1: Main Bearing Cap Bolt Tightening Sequence
    G93I40152Courtesy of FORD MOTOR CO.
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