Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 132Get this manual

Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 132

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LOWER UNIT CHECKING THE LOWER UNIT (FOR AIR LEAKS)

CAUTION:
Do not overpressurize the lower unitExcessive pressure may damage the oil seals(1)Remove the gear oil level check screw(2