LOWR Lower unit6-25 67C3K112. Measure the propeller shaft housingheight (M3) as shown.M3 = M3’ – 10 mmNOTE:Measure the propeller shaft housing at 4points to find the height average.3. Calculate the reverse gear shim thick-ness (T2) as shown in the examplesbelow.NOTE:“R” is the deviation of the lower case dimen-sion from standard. The “R” mark a isstamped on the trim tab mounting surface ofthe lower case in 0.01 mm units. If the “R”mark is unreadable, assume that “R” is zeroand check the backlash when the unit isassembled.Example:If “M3” is 96.79 mm and “R” is (–1), thenT2 = 98.00 – 96.79 + (–1)/100 mm= 98.00 – 96.79 – 0.01 mm= 1.20 mmIf “M3” is 96.79 mm and “R” is (+3), thenT2 = 98.00 – 96.79 + (+3)/100 mm= 98.00 – 96.79 + 0.03 mm= 1.24 mm4. Select the reverse gear shim(s) (T2) asfollows.Digital caliper 1: 90890-06704Shimming plate 2: 90890-06701S67C607512S67C6076M3’10 mm(0.39 in)1 2M3Calculation formula:Reverse gear shim thickness (T2) =98.00 – M3 + R/100Calculated number Rounded number0.01–0.02 0.000.03–0.05 0.020.06–0.08 0.050.09–0.10 0.08Available shim thicknesses:0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50mmS67C6078a
