69J3D11 6-581234567892. Calculate the forward gear shim thick-ness (T2) as shown in the examplesbelow.NOTE:“R” is the deviation of the lower case dimen-sion from standard, and “A” is the deviation ofthe propeller shaft housing dimension fromstandard. The “R” mark a is stamped on thetrim tab mounting surface of the lower case,and the “A” mark b is stamped on the pro-peller shaft housing in 0.01 mm units. If the“R” mark or “A” mark is unreadable, assumethat “R” and “A” are zero and check the back-lash when the unit is assembled.Example:If “M5” is 22.95 mm and “M6” is 15.73 mmand “R” is (+1) and “A” is (+6), thenT2 = 8.45 + (+1)/100 – (+6)/100 – 22.95 + 15.73 mm= 8.45 + 0.01 – 0.06 – 22.95 + 15.73 mm= 1.18 mm3. Select the forward gear shim(s) (T2) asfollows.Example:If “T2” is 1.18 mm, then the forward gearshim is 1.15 mm.If “T2” is 1.20 mm, then the forward gearshim is 1.18 mm.Selecting the propeller shaft shims1. Turn the taper roller bearing outer race1 two or three times to seat the rollers,and then measure the bearing height(M6) as shown.Shimming plate 2: 90890-06701Digital caliper 3: 90890-06704Calculation formula:Forward gear shim thickness (T2) =8.45 + R/100 – A/100 – M5 + M6A – 3 BS69J6625Calculated numeralat 1/100 place Rounded numeral1, 2 03, 4, 5 26, 7, 8 59, 10 8Available shim thicknesses:0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and0.50 mmS69J6705T´4Shimming (counter rotation model)
