LOWR Lower unit6-25 6C13G112. Calculate the forward gear shim thick-ness (T1) as shown in the examplesbelow.NOTE:“F” is the deviation of the lower case dimen-sion from standard. The “F” mark a isstamped on the trim tab mounting surface ofthe lower case in 0.01 mm units. If the “F”mark is unreadable, assume that “F” is zeroand check the backlash when the unit isassembled.Example:If “M1” is 26.00 mm and “F” is (–1), thenT1 = 26.50 + (–1)/100 – 26.00 mm= 26.50 – 0.01 – 26.00 mm= 0.49 mm3. Select the forward gear shim(s) (T1) asfollows.Example:If “T1” is 0.49 mm, then the forward gearshim is 0.48 mm.If “T1” is 0.58 mm, then the forward gearshim is 0.55 mm.Selecting the reverse gear shims1. Measure the backlash to find the neces-sary shim thickness (T2). Add or removeshim(s) if out of specification. For mea-suring procedure, see “Measuring theforward and reverse gear backlash.”NOTE:Measure the backlash with the originalshim(s). If the original shim(s) is unavailable,start with a 0.50 mm shim.Backlash (F50, F60) 6Measuring the forward and reversegear backlash1. Remove the water pump assembly.2. Set the gear shift to the neutral positionat the lower unit.Calculation formula:Forward gear shim thickness (T1) =26.50 + F/100 – M1Calculated 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 mmAvailable shim thickness:0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and0.50 mm
