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Home >> Cadillac >> 1983 >> Eldorado 5.7 N >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 5.7L V8 Diesel - VIN [N] >> Overhaul >> Main Bearing Service

Main Bearing Service

  1. Check bearing clearance. Use floor jack or other support to hold crankshaft against upper bearing half.
  2. Use Plastigage across full width of bearing. Install cap with bearing and tighten. Determine bearing clearance by removing cap and check flattened Plastigage with graduations on container. If clearance is greater than .0035" (.089 mm), replace BOTH bearing halves as a set.
    NOTE: DO NOT  use shims.
  3. To replace main bearing halves, remove caps and lower shell. Insert a flattened cotter pin or rollout pin in oil passage hole of crankshaft. Rotate crankshaft in opposite direction of cranking rotation.
  4. Check journals for roughness or wear. Out-of-round may be measured with crankshaft installed using a crankshaft caliper and inside micrometer. Upper bearing half must be removed when measuring journals. Maximum out-of-round is .0015" (.038 mm).
  5. Apply lubricant to thrust flanges of No. 3 main bearing halves. Measure crankshaft end play. End play should be .0035-.0135" (.89-.343 mm) using dial indicator.
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