1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 45Get this manual
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OUTBOARD INSTALLATION
aMarkSpacerO-ringCapSpacer 2 Thread cap up to the 6.4 mm (14 in mark
aCap6.4 mm (.250 in mark
Page 1D-4
90-827242R02 FEBRUARY