Yamaha F150B Service Manual

Also see for F150B: Owner's manual Service manual Owner's manual

8-40Shimming (regular rotation model)012345678910A2. Measure the thickness of each originalshim(s) (T1) in 2 places.TIP:Do not reuse a shim if it is deformed orscratched.3. Determine the forward gear shimthickness (T1) adjustment in the“Forward gear shim (T1) selection chart”according to the truncated average (BL1)from “Measuring the forward gearbacklash.”Example:(BL1) = 0.10 mm a(T1) adjustment = –0.21 mm b from the“Forward gear shim (T1) selection chart.”The current shim thickness must bedecreased by 0.21 mm.A Backlash measurement (BL1)B Shim thickness adjustmentTIP:• If the shim thickness adjustment value ispositive, the current shim thickness must beincreased by that amount and, if the valueis negative, the current shim thickness mustbe decreased by that amount.• The gray-colored area on the selectionchart indicates the range of the specifiedbacklash. Shimming is not required if themeasured backlash is within the gray-col-ored area.• The values for the shim thickness adjust-ments specified in the selection chart areintended to achieve the median value withinthe range for the specified forward orreverse gear backlash.• The selection chart table shows the shimthickness adjustments for marked points onthe chart.4. Calculate the new forward gear shimthickness (T1) as same way in theexample.Calculation formula:New forward gear shim thickness (T1) = Cur-rent forward gear shim thickness + Shimthickness adjustmentExample:If the current forward gear shim thickness is0.52 and the shim thickness adjustment is–0.22 mm, then(T1)= 0.52 mm + (–0.22) mm= 0.52 mm – 0.22 mm= 0.30 mmTIP:• Use the least number of shims to achievethe required shim thickness.• If the calculated shim thickness cannot beobtained with a combination of the availableshims, increase the shim thickness by0.01 mm.5. Install the shim(s) (T1) and taper rollerbearing outer race.–0.28 –0.25 –0.21 0 0 00 5 10 15 20 25B (mm) 0–0.20–0.40 0 5 10 15 20 25A (1/100 mm)ABab Available shim thicknesses:0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and0.50 mm