Yamaha F50 Service Manual
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62Y3A116-42 1 2 3 4 5 6 7 8 I No. Part name Q’ty RemarksTightening torques Stage N·mkgf·mft·lb 1 Lower unit 1 2 Plastic tie 1 Not reusable 3Hose 1 4 Check screw 1 7 0.7 5.1 5 Gasket 2 Not reusable 6 Dowel pin 2 7 Bolt 4 M10 × 40 mm 40 4.0 29 8 Drain screw 1 7 0.7 5.1 9Grommet 1 10 Bolt 1 M10 × 45 mm, : 12 mm 11 Bolt 1 M8 × 60 mm 12 Thrust washer 1 13 Propeller 1 14 Washer 1 15 Washer 1 16 Cotter pin 1 Not reusable 17 Propeller nut 1 35 3.5 25 18 Trim tab 1 Lower unit (T50/FT50B, FT50C)
LOWRLower unit 6-4362Y3A11 Removing the lower unit 1. Drain the gear oil. For draining proce- dures, see Chapter 3, “Replacing the gear oil.” 2. Set the gearshift to the neutral position, and place a block of wood between the anti-cavitation plate and propeller to keep the propeller from turning, and then remove the propeller nut and propeller. WARNING Do not hold the propeller with your hands when loosening or tightening it. Be sure to remove the battery leads from the bat- teries and the engine shut-off switch. Put a block of wood between the cavitation plate and propeller to keep the propeller from turning. 3. Disconnect the speedometer hose 1 . 4. Mark the trim tab 2 at the area shown, and then remove it.5. Loosen the bolts, and then remove the lower unit from the upper case.
62Y3A116-44 1 2 3 4 5 6 7 8 I — MEMO — Lower unit (T50/FT50B, FT50C)
LOWRLower unit 6-4562Y3A11 Water pump and shift rod (T50/FT50B, FT50C)6
62Y3A116-46 1 2 3 4 5 6 7 8 I No. Part name Q’ty RemarksTightening torques Stage N·mkgf·mft·lb 1 Shift rod assembly 1 2 Oil seal 1 Not reusable 3 Oil seal housing 1 4 O-ring 1 Not reusable 5 Circlip 1 6 Shift rod 1 7 O-ring 1 Not reusable 8Bolt 2 M6 × 16 mm 9 Woodruff key 1 10 Bolt 2 M8 × 55 mm 11 Bolt 2 M8 × 45 mm 12 Water pump housing 1 13 Grommet 1 14 Gasket 1 Not reusable 15 Insert plate cartridge 1 16 Impeller 1 17 Outer plate cartridge 1 18 Gasket 1 Not reusable 19 Dowel pin 2 20 Oil seal housing assembly 1 21 Gasket 1 Not reusable 22 Oil seal housing 1 23 O-ring 1 Not reusable 24 Oil seal 2Not reusable Water pump and shift rod (T50/FT50B, FT50C)
LOWRLower unit 6-4762Y3A11 Removing the water pump and shift rod 1. Remove the water pump assembly and shift rod assembly 1 . NOTE: Pull up the shift rod assembly a little a to dis- connect it from the shift slider 2 , turn it coun- terclockwise 90° b , and then remove it. Checking the water pump and shift rod 1. Check the pump housing for deforma- tion. Replace if necessary.2. Check the impeller 1 and insert plate cartridge 2 for cracks or wear. Replace if necessary. 3. Check the Woodruff key 3 and the groove a on the drive shaft for wear. Replace if necessary. 4. Check the shift rod for cracks or wear. Replace if necessary. S62Y6535 S62Y6540 2 1 S62Y6545 3
62Y3A116-48 1 2 3 4 5 6 7 8 I Installing the water pump and shift rod 1. Install the shift rod assembly 1 . NOTE: Install the shift rod assembly into the lower case, turn it clockwise 90° a , and then push it down b to connect it to the shift slider 2 . 2. Install the new oil seals into the oil seal housing as shown. È For USA and Canada É For worldwide 3. Install the new O-ring 7 . 4. Install the new gasket 8 , oil seal housing 9 , new gasket 0 , and outer plate car- tridge A . 5. Install the Woodruff key into the drive shaft. Bearing housing oil seal installer 3 : YB-06269 Driver handle 4 : YB-06071 Needle bearing attachment 5 : 90890-06610 Driver rod L3 6 : 90890-06652 Water pump and shift rod (T50/FT50B, FT50C)
LOWRLower unit 6-4962Y3A11 6. Align the groove on the impeller B with the Woodruff key C , and then install it to the drive shaft. 7. Install the insert plate cartridge D and grommet E into the pump housing F . NOTE: Align the insert plate cartridge projection c with the hole d in the pump housing.8. Install the new gasket G , pump housing assembly F , and dowel pins H to the lower case. 9. Install and tighten the bolts I .NOTE: When installing the pump housing, apply grease to the inside of the housing, and then turn the drive shaft clockwise while pushing down the pump housing. S62Y6580 F E D A d c S62Y6585 F I H G
62Y3A116-50 1 2 3 4 5 6 7 8 I — MEMO — Water pump and shift rod (T50/FT50B, FT50C)
LOWRLower unit 6-5162Y3A11 Propeller shaft housing (T50/FT50B, FT50C)6