Main Journal Inspection
CRANKSHAFT MAIN BEARINGSBearing caps are not interchangeable and should be marked at removal to insure correct assembly. Upper and lower bearing halves are NOT interchangeable. Lower main bearing halves of 1, 2, 4, 5 and 6 are interchangeable. Upper main bearing halves of 1, 2, 4, 5 and 6 are interchangeable.
CRANKSHAFT MAIN JOURNALS
The crankshaft journals should be checked for excessive wear, taper and scoring. Limits of taper or out-of-round on any crankshaft journals should be held to 0.013 mm (0.0005 inch). Journal grinding should not exceed .508 mm (.020 inch) under the standard journal diameter. Do NOT grind thrust faces of Number 3 main bearing. Do NOT nick crank pin or bearing fillets. After grinding, remove rough edges from crankshaft oil holes and clean out all passages.
CAUTION: With the forged crankshafts it is important that the final paper or cloth polish after any journal regrind be in the same direction as normal rotation in the engine.
Upper and lower Number 3 bearing halves are flanged to carry the crankshaft thrust loads and are NOT interchangeable with any other bearing halves in the engine. All bearing cap bolts removed during service procedures are to be cleaned and oiled before installation. Bearing shells are available in standard and the following undersizes: 0.025 mm (.001 inch), 0.051 mm (.002 inch), .076 mm (.003 inch), 0.254 mm (.010 inch), .305 mm (0.012 inch) and .508 mm (.020 inch). Never install an undersize bearing that will reduce clearance below specifications.