Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 198Get this manual

Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 198

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CRANKCASE, CRANKSHAFT AND CAMSHAFT
2 Install: 9 Oil seal (upper housing)

Install the Oil seal direction upside down as shownNeedle bearing attachment: YB-0616890890-06613 Driver rod