Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 454Get this manual
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BIGFOOT GEAR HOUSING
aShift Shaft AssemblySplines
BApply Loclile 271 on bottom half of threads of bolts; install bolts and torque to 60 Ib-in(6.B Nm)
Loctile "271" (92-809819)