Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 473Get this manual
BIGFOOT GEAR HOUSING
7lightly turn drive shaft back-and-forth (no movement should be noticed at propeller shaft)8Dial Indicator registers amount of backlashwhich must be between specification shown in chartMODEL DIAL INDICATOR MINIMUM 0.012 in(0.30 mm) 0.012 in(0 .30 mm) 0.012 in(0.30 mm) 0.Q15 in(0.38 mm) READING MAXIMUM 0.019 in(.48 mm) 0.019 in(.48 mm) 0.019 in(.48 mm) 0.022 in(0.55 mm)
404550 Bigloot (4-Stroke)
60 Bigfoot 75-thru-90 (3 Cylinder)
100115125 (4 Cylinder)
9If backlash is less than the minimum specification, remove shim(s) from in front of forward gear bearing race to obtain correct backlashWhen reinstalling pinion nut, apply Loctite 271 on threads of nut10If backlash is more than the maximum specificationadd shim(s) in front of forward gear bearing race to obtain correct backlashWhen reinstalling pinion nut, apply Loctite 271 on threads of nut