1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 330Get this manual
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BIG FOOT
a-Vent Plug b-Fill Plug 6 Apply liberal coat of 2-4-C wTeflon (92-825407A12) to propeller shaft splines
2-4-C wTeflon (92-850736A1)
7 Install thrust hub cap on