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Crankshaft & Main Bearings

NOTE: Crankshafts are specially treated and can only be ground by the factory.
  1. Use Plastigage to measure main bearing clearances. Standard crankshafts are marked with Red or Blue dots on side of counterweights or on sprocket end of crankshaft. The crankshaft is cast with a "K" on center counterweight.
  2. Factory ground crankshafts are identified by paint stripes marked on 1st counterweight. This indicates either 1st, 2nd or 3rd undersize (3 undersizes are available).
  3. Factory ground crankshafts are supplied with bearings which are also color coded. If Red and Blue bearing shells are used in combination, ensure shells of same color are on same side of crankshaft. For example, all Red bearings in cylinder block and all Blue in main bearing caps.
  4. If 3 different color (Yellow, Green and White) bearings are used, match bearing shells to color codes on bearing journals and crankcase. If crankcase mark is missing, install both shells according to crankshaft color code.
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