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Crankshaft & Main Bearings Service

  1. Ensure main bearing caps are numbered for location and arrow on cap points toward timing belt end of crankshaft.
  2. Cylinder block main bearing bore size is indicated by a letter "A", "B" or "C" stamped on cylinder block. Size mark is in accordance with location of main bearing journal. See Figure. Ensure main bearing bore is within specification. See MAIN BEARING BORE SPECIFICATIONS table.
  3. Crankshaft main bearing journal size is indicated by numerical size mark, located on No. 1 cylinder crankshaft counterweights. See Figure. Ensure main bearing journal is within specification. See MAIN BEARING JOURNAL DIAMETER SPECIFICATIONS table.
    NOTE: Main bearings contain a color code marked on side of main bearing. Standard main bearings contain only one color code and undersize main bearings contain 2 color codes. See Figure.
  4. If color code on original bearing cannot be obtained, use size mark letter on cylinder block and number on crankshaft to determine proper size main bearing to be used. See MAIN BEARING SELECTION (STANDARD BEARINGS) table. Standard bearing thickness is as listed. See BEARING THICKNESS SPECIFICATIONS table.
  5. Main bearings are available in .010" (.25 mm) undersize. Undersize bearings are coded with 2 color code marks. See Figure or Figure. Undersize bearings are available in 5 thickness variations. See BEARING THICKNESS SPECIFICATIONS table.
  6. If necessary, regrind main bearing journals to .010" (.25 mm) undersize with a finished diameter of 1.7612-1.7618" (44.732-44.750 mm). Using finished journal diameter and letter marked on cylinder block, determine color code undersize bearing to be used. See MAIN BEARING SELECTION (UNDERSIZE BEARINGS) table.
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