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Main Bearing Bore Standard Dimensions

Engine 137.
Basic bore diameter 68.500-68.519 mm
Code Number 52, 1st Stage, (Blue) 68.500-68.506 mm
Code number 54, 2nd Stage, (Yellow) 68.506-68.513 mm
Code Number 56 3rd Stage, (Red) 68.513-68.519
basic bore width at fit bearing 17.073-18.00 mm
permissible out of roundness and conicity of basic bore 0.02 mm