Yamaha F150A Service Manual

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8-44Shimming (regular rotation model)012345678910AA. Backlash measurement (BL2)B. Shim thickness adjustment4. Calculate the new reverse gear shim (T2)thickness.TIP:• Use the lowest number of shims to obtainthe required shim thickness.• If the calculated shim thickness cannot beobtained with a combination of the availableshims, increase or decrease the shim thick-ness by 0.01 mm.Calculation formula:New reverse gear shim (T2) thickness =Current reverse gear shim thickness + shimthickness adjustmentExample:Use the following formula when the shimthickness adjustment value is positive.Current reverse gear shim thickness =0.62 mmShim thickness adjustment = 0.14 mmNew reverse gear shim (T2) thickness =0.62 mm + 0.14 mm= 0.76 mmUse the following formula when the shimthickness adjustment value is negative.Current reverse gear shim thickness =0.62 mmShim thickness adjustment = –0.21 mmNew reverse gear shim (T2) thickness =0.62 mm + (–0.21 mm) = 0.41 mm5. Install the determined reverse gear shims(T2) and propeller shaft housing assem-bly.0 5 10A0.34 0.30 0.27B0.100–0.10–0.20–0.30–0.400 5 10B (mm)A (1/100 mm)65 70 75 80 850.10 –0.14 –0.17 –0.21 –0.2465 70 75 80 85abAvailable shim thicknesses:0.10, 0.12, 0.15, 0.18, 0.30, 0.40,0.50 mm