1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 62Get this manual

1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 62

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When press-fitting the bearing, be sure to force the inner raceDo not force the outer race Crankshaft main bearings Thoroughly clean the crankshaft, sparingly oil both the upper and lower ball bearing