Yamaha F150B Service Manual

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8-38Shimming (regular rotation model)012345678910AMeasuring the forward gear backlash• Spray anti-rust lubricant on the gear andbearings before installation. Do not applygear oil to the parts. Otherwise, correctmeasurements cannot be obtained.• Keep the parts free of foreign material,such as dirt and lint.• When measuring the forward gear orreverse gear backlash, use the originalbearings and shims.• Use heat-resistant gloves, otherwiseburns could result.• Remove any flammable substances,such as gasoline and oil, around theworking area to avoid the risk of fire.• Heat the lower case in a well-ventilatedarea.1. Install the original shim(s) (T1).TIP:• If the original shim(s) (T1) are missing,install new shims with a combined thick-ness of 0.55 mm.• Do not reuse a shim if it is any deformed orscratched.2. Install the taper roller bearing outer race.See “Assembling the lower case” (8-17)step 2 and step 3.3. Install the forward gear assembly into thelower case.4. Install the drive shaft, thrust bearing a,and shim(s) (T3) b.TIP:Turn the drive shaft 10 times or more to seatthe thrust bearing.5. Install the pinion and pinion nuttemporarily.TIP:When installing the pinion, lift up the driveshaft slightly and align the pinion and shaftsplines.6. Install a new O-ring c to the drive shafthousing d, and then install the driveshaft housing d.TIP:Install the drive shaft housing with the cutouta in the housing facing forward.7. Tighten the pinion nut to the specifiedtorque.abDrive shaft holder 6 e: 90890-06520Pinion nut holder f: 90890-06715cdaeff