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ENGINE MECHANICAL 6A – 29 Crankshaft Bearing Selection When installing new crankshaft bearings or replacing old Crankshaft Bearing Housing Grade Mark Position Crankshaft bearing housing grade marks 1 or 2 are Example: Crankshaft Journal Grade Mark Position The crankshaft journal grade marks (1 or –) are stamped on The crankshaft journal mark No. 4 is stamped on crankshaft NOTE: Although all upper journal bearings (cylinder body side) Main Bearing Bore Diameter mm(in.) Crankshaft Main Journal Diameter mm(in.) Size Mark Inside Diameter Grade Mark Outside Diameter Crankshaft Bearing Grade Mark Oil Clearance mm (in.) 1 or - 69.927 ~ 69.932 (2.7530 ~ 2.7532) 2 or - - 69.922 ~ 69.927 (2.7528 ~ 2.7530) 3 or - - - 69.917 ~ 69.922 (2.7526 ~ 2.7528) 1 or - 69.927 ~ 69.932 (2.7530 ~ 2.7532) 2 or - - 69.922 ~ 69.927 (2.7528 ~ 2.7530) 3 or - - - 69.917 ~ 69.922 (2.7526 ~ 2.7528) Black Blue Green Black 73.987 ~ 74.000 (2.9129 ~ 2.9134) 73.975 ~ 73.987 (2.9124 ~ 2.9129) 1 2 0.035 ~ 0.061 (0.0014 ~ 0.0024) 0.032 ~ 0.058 (0.0013 ~ 0.0023) 0.037 ~ 0.063 (0.0015 ~ 0.0025) 0.031 ~ 0.056 (0.0012 ~ 0.0022) 0.036 ~ 0.048 (0.0014 ~ 0.0019) 0.033 ~ 0.058 (0.0013 ~ 0.0023) No. 1 Bearing Housing No. 2 Bearing Housing No. 3 Bearing Housing No. 4 Bearing Housing No. 5 Bearing Housing 1 2 1 1 2 |