1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 183Get this manual
6If clea rance between shimming tool and pini on gear is .025" lO.64mm)pinion gear depth is co rrect7Ir clearance between shimming tool and pinion gear is above or below .025", reshim drive shaft ta pe red beariug race to ra ise or lo wer pinion gear as follows: RRemove pinion gear retainer nu and collarbRemo ve drive shaftcRemove or add an amount of shim (9) suffici cnt to co rrect pinion gear depthEXAiWLE: Pinion gea depth is .020" Add .005" Pinion gear depth wiJ! be .025" Pinion gear depth is .030" Subtract .005" Pinion gear depth will be 025" (0.5 1mm) (0 .13mm) (0.64mm) (0.76mm) (0.13mm) (O.64mm)
d Reassemble as ins truc ted inDri ve Shaft and Pini on Cear Heassembl y Installation "immedia tel precedi ng When rei nstalling pi ni on nu tappl Loct ite GradeA" on threads of nut
DETERMINING FORWARD GEAR BACKLASH
IMPORTANT: Bearing carrier must be assembled to provide pilot lor propeller shaft,
aBacklash tnd lcalor Toot Dial tndicator Diat Indicator Adaptor KitApply Pressure in Direction of Arrow Figure 4CheckIng Gear Backlash