Yamaha F100B F100C Outboards Factory Service Manual, Page 174Get this manual
Lower unit
NOTE: "P" is the deviation of the lower case dimension from standardThe "P" mark is stamped on the trim tab mounting surface of the lower case in 0.01 mm unitsIf the "P" mark is unreadable, assume that "P" is zero and check the backlash when the unit is assembledCalculation formula: Pinion shim thickness (T3)62.50P100 M3 M4 Example: If "M3" is 46.85 mm and "M4" is 15.12 mm and "P" is (5), then T362.50(5)100 46.85 15.12 mm62.50 0.05 46.85 15.12 mm0.48 mm 6Select the pinion shim(s) (T3) as followsCalculated numeral at 1100 place 1, 3, 4, 6, 7, 9, 10 Rounded numeral 8
NOTE: Select the shim thickness (T1) by using the specified measurement(s) and the calculation formula Measure the bearing outer race at three points to find the height averageShimming plate 2: 90890-06701 Digital caliper 3: 90890-06704 2Calculate the forward gear shim thickness (T1) as shown in the examples below