Yamaha F50 Service Manual
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62Y3A112-28 1 2 3 4 5 6 7 8 I Clamp bracket Symbol UnitModel USA T50TR——— Canada T50TR——— Worldwide FT50BET FT50CEHD FT50CED FT50CET B1 mm (in) 126 (5.0) B2 mm (in) 254 (10.0) B3 mm (in) 163.5 (6.4) B4 mm (in) 50.8 (2.0) B5 mm (in) 180 (7.1) B6 mm (in) 355 (14.0) B7 mm (in)— B8 mm (in) 139 (5.5) B9 mm (in) 18.5 (0.7) C2 mm (in)— C3 mm (in) 69 (2.7) D1 mm (in) 13 (0.5) D2 mm (in) 55.5 (2.2) Maintenance specifications
SPECSpecifications 2-2962Y3A11 Tightening torques2 Specified torques Part to be tightened Thread sizeTightening torques N·mkgf·mft·lb Power unit Flywheel magnet nut—160 16 116 Stator base screw M6 4 0.4 2.9 Cover screw M6 3 0.3 2.2 Negative battery lead bolt M8 9 0.9 6.5 Positive battery lead nut—70.75.1 Oil pressure switch—90.96.5 Oil pressure switch lead screw—20.21.4 Ignition coil bolt M6 7 0.7 5.1 Starter motor bolt M8 30 3.0 22 Starter motor terminal nut—70.75.1 Power unit bolt M8 21 2.1 15 Tensioner bolt—80.85.8 Tensioner adjusting bolt M8 25 2.5 18 Drive sprocket nut—140 14 101 Driven sprocket bolt M10 38 3.8 28 Spark plug—18 1.8 13 Cylinder head bolt1st M660.64.3 2nd 12 1.2 8.7 1st M923 2.3 17 2nd 47 4.7 34 Adjusting screw locknut—14 1.4 10 Oil filter—18 1.8 13 Drain bolt—18 1.8 13 Exhaust cover bolt1st M660.64.3 2nd 12 1.2 8.7 Crankcase bolt1st M660.64.3 2nd 12 1.2 8.7 1st M815 1.5 11 2nd 30 3.0 22 Connecting rod cap bolt1st —60.64.3 2nd 17 1.7 12 Lower unit (F50/F50A) Check screw—70.75.1 Lower unit bolt M10 40 4.0 29 Drain screw—70.75.1 Propeller nut—35 3.5 25 Water inlet cover screw—50.53.6 Pinion nut M17 75 7.5 54
62Y3A112-30 1 2 3 4 5 6 7 8 I Lower unit (T50/FT50B, FT50C) Check screw—70.75.1 Lower unit bolt M10 40 4.0 29 Drain screw—70.75.1 Propeller nut—35 3.5 25 Ring nut—105 10.5 76 Water inlet cover screw—50.53.6 Pinion nut M22 95 9.5 69 Bracket unit Tiller handle assembly nut (F50/F50A)—37 3.7 27 Engine shut-off switch nut (F50/F50A)—40.42.9 Tiller handle bracket nut (F50/F50A)—38 3.8 27 Main switch nut (F50/F50A)—50.53.7 Friction wing nut (FT50C)—13 1.3 9.4 Tiller handle assembly nut (FT50C)—37 3.7 27 Throttle cable (short) locknut (FT50C)—37 3.7 27 Upper mount nut—24 2.4 17 Lower mount nut—42 4.2 30 Trim sensor screw M6 2 0.2 1.4 Clamp bracket self-locking nut—23 2.3 17 Power trim and tilt Tilt cylinder end screw—90 9.0 65 PTT motor bolt M5 4 0.4 2.9 Reservoir cap—6.5 0.65 4.7 Trim cylinder end screw—80 8.0 58 Tilt piston bolt M12 61 6.1 44 Relief valve bracket bolt M5 5.3 0.53 3.8 Gear pump assembly bolt M6 6.5 0.65 4.7 Gear pump bracket bolt M5 5.3 0.53 3.8 Electrical unit Pulser coil screw—40.42.9 Starter motor nut—90.96.5 Part to be tightened Thread sizeTightening torques N·mkgf·mft·lb Tightening torques
SPECSpecifications 2-3162Y3A11 General torques This chart specifies tightening torques for standard fasteners with a standard ISO thread pitch. Tightening torque specifications for special components or assemblies are provided in applicable sections of this man- ual. To avoid warpage, tighten multi-fastener assemblies in a crisscross fashion and pro- gressive stages until the specified torque is reached. Unless otherwise specified, torque specifications require clean, dry threads. Components should be at room temperature. Nut (A) Bolt (B)General torque specifications N·mkgf·mft·lb 8 mm M5 5 0.5 3.6 10 mm M6 8 0.8 5.8 12 mm M8 18 1.8 13 14 mm M10 36 3.6 25 17 mm M12 43 4.3 31
62Y3A11 CHK ADJ 1 2 3 4 5 6 7 8 I Periodic checks and adjustments Special service tools ..................................................................................... 3-1 Maintenance interval chart ............................................................................ 3-3 Top cowling .................................................................................................... 3-4 Checking the top cowling........................................................................... 3-4 Fuel system .................................................................................................... 3-4 Checking the fuel joint and fuel hoses (fuel joint-to-carburetor) ................ 3-4 Checking the fuel filter ............................................................................... 3-5 Power unit ....................................................................................................... 3-5 Checking the engine oil ............................................................................. 3-5 Replacing the engine oil ............................................................................ 3-5 Checking the timing belt ............................................................................ 3-7 Replacing the timing belt ........................................................................... 3-7 Checking the valve clearance.................................................................. 3-10 Checking the spark plugs ........................................................................ 3-11 Checking the thermostat.......................................................................... 3-12 Checking the cooling water passage ....................................................... 3-13 Control system ............................................................................................. 3-13 Checking the throttle cable operation ...................................................... 3-13 Checking the gearshift operation ............................................................. 3-14 Checking the engine idle speed .............................................................. 3-15 Checking the ignition timing..................................................................... 3-15 Power trim and tilt unit ................................................................................ 3-16 Checking the power trim and tilt operation .............................................. 3-16 Checking the power trim and tilt fluid level .............................................. 3-16 Lower unit ..................................................................................................... 3-17 Checking the gear oil level ...................................................................... 3-17 Replacing the gear oil .............................................................................. 3-17 Checking the lower unit (for air leakage) ................................................. 3-19 Checking the propeller............................................................................. 3-19 General .......................................................................................................... 3-19 Checking the anodes ............................................................................... 3-19 Checking the battery................................................................................ 3-20 Lubrication ............................................................................................... 3-21
CHK ADJ Periodic checks and adjustments 3-162Y3A11 Special service tools3 Oil filter wrench YU-38411 Flywheel magnet holder YB-06139 Universal puller YB-06117 Inductive self-powered tachometer YU-08036-B Battery powered timing light YM-33277-APressurfge/vacuum tester YB-35956-A Oil filter wrench 90890-01426 Flywheel holder 90890-06522 Flywheel puller 90890-06521 Digital tachometer 90890-06760 For USA and Canada For worldwide
62Y3A113-2 1 2 3 4 5 6 7 8 I Timing light 90890-03141 Leakage tester 90890-06762 Special service tools
CHK ADJ Periodic checks and adjustments 3-362Y3A11 Maintenance interval chart3 Use the following chart as a guideline for general maintenance. Adjust the maintenance intervals according to the operating conditions of the outboard. NOTE: If operating in salt water, turbid or muddy water, flush the engine with fresh water after each use. If leaded gasoline is used regularly, check the engine valves and related parts every 300 hours of operation in addition to the items in the maintenance interval chart.Item RemarksInitial Every Refer to page 10 hours (Break-in)50 hours (3 months)100 hours (6 months)200 hours (1 year) Top cowling Top cowling fit Check 3-4 Fuel system Fuel joint and fuel hoses Check 3-4 Fuel filter Check/replace 3-5 Fuel tank Cleaning— Power unit Engine oil Change 3-5 Oil filter Change 3-5 Timing belt Check 3-7 Valve clearance Check/adjust 3-10 Spark plugs Clean/adjust/replace 3-11 Thermostat Check 3-12 Water leakage Check— Motor exterior Check— Exhaust leakage Check— Cooling water passage Clean 3-13 Control system Throttle cable Check/adjust 3-13 Shift cable Check/adjust 3-14 Engine idle speed Adjust 3-15 Ignition timing Check 3-15 Power trim and tilt unit Power trim and tilt Check 3-16 Lower unit Gear oil Change 3-17 Lower unit leakage Check 3-19 Propeller Check 3-19 General Anodes Check/replace 3-19 Battery Check every 1 month 3-20 Wiring and connectors Check/reconnect— Nuts and bolts Tighten— Lubrication points Lubricate 3-21
62Y3A113-4 1 2 3 4 5 6 7 8 I Top cowling3 Checking the top cowling 1. Check the fitting by pushing the cowling with both hands. Adjust if necessary. 2. Loosen the nuts and bolts 1 . 3. Move the hook 2 up or down slightly to adjust its position. NOTE: To loosen the fitting, move the hook toward the seal. To tighten the fitting, move the hook away from the seal. 4. Tighten the nuts and bolts. 5. Check the fitting again and, if necessary, repeat steps 2–4. Fuel system3 Checking the fuel joint and fuel hoses (fuel joint-to-carburetor) 1. Remove the plate 1 , and then check the fuel hose connections and fuel joint 2 for leaks. Replace if necessary. Also, check the fuel filter 3 , fuel pump 4 , and carbu- retor 5 for leaks, and the fuel hoses for leaks and deterioration. Replace if nec- essary. S62Y3030 1 4 3 2 5 Maintenance interval chart / Top cowling / Fuel system
CHK ADJ Periodic checks and adjustments 3-562Y3A11 Checking the fuel filter 1. Check the fuel filter element 1 for dirt and residue and check the fuel filter cup 2 for foreign substances and cracks. Clean with straight gasoline and replace the cup if necessary. ÈF50/F50A ÉT50/FT50B, FT50C NOTE: Be sure not to spill any fuel when removing the fuel filter cup. Power unit3 Checking the engine oil 1. Place the outboard in an upright position. 2. Remove the engine oil dipstick, wipe it clean, and then insert it back into the oil filler hole. 3. Remove the dipstick again to check the oil level and the oil for discoloration, and its viscosity. NOTE: Replace the oil if it appears milky or black. If the engine oil is above the maximum level mark a, drain sufficient oil until the level is between a and b. If the engine oil is below the minimum level mark b, add sufficient oil until the level is between a and b. Replacing the engine oil 1. Remove the engine oil dipstick and oil filler cap 1 . S62Y3070 1