Yamaha F50 Service Manual
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SERVICE MANUAL 62Y-28197-3A-11290408 F50A FT50B FT50C
NOTICE This manual has been prepared by Yamaha primarily for use by Yamaha dealers and their trained mechanics when performing maintenance procedures and repairs to Yamaha equipment. It has been written to suit the needs of persons who have a basic understanding of the mechanical and electrical concepts and procedures inherent in the work, for without such knowledge attempted repairs or service to the equipment could render it unsafe or unfit for use. Because Yamaha has a policy of continuously improving its products, models may differ in detail from the descriptions and illustrations given in this publication. Use only the latest edition of this manual. Authorized Yamaha dealers are notified periodically of modifications and significant changes in specifications and procedures, and these are incorporated in successive editions of this manual. Important information1 Particularly important information is distinguished in this manual by the following notations: The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED! WARNING Failure to follow WARNING instructions could result in severe injury or death to the machine operator, a bystander, or a person inspecting or repairing the outboard motor. CAUTION: A CAUTION indicates special precautions that must be taken to avoid damage to the out- board motor. NOTE: A NOTE provides key information to make procedures easier or clearer. F50A, FT50B, FT50C SERVICE MANUAL ©2000 by Yamaha Motor Co., Ltd. 1st Edition, November 2000 All rights reserved. Any reprinting or unauthorized use without the written permission of Yamaha Motor Co., Ltd. is expressly prohibited. Printed in the Netherlands
Contents General information 1GEN INFO Specifications 2SPEC Periodic checks and adjustments 3CHK ADJ Fuel system 4FUEL Power unit 5POWR Lower unit 6LOWR Bracket unit 7BRKT Electrical systems 8ELEC Index –+
62Y3A11 GEN INFO 1 2 3 4 5 6 7 8 I General information How to use this manual ................................................................................. 1-1 Manual format............................................................................................ 1-1 Symbols ..................................................................................................... 1-2 Safety while working...................................................................................... 1-3 Fire prevention........................................................................................... 1-3 Ventilation .................................................................................................. 1-3 Self-protection ........................................................................................... 1-3 Parts, lubricants, and sealants .................................................................. 1-3 Good working practices ............................................................................. 1-4 Disassembly and assembly ....................................................................... 1-4 Identification ................................................................................................... 1-5 Applicable models ..................................................................................... 1-5 Serial number ............................................................................................ 1-5 Features and benefits .................................................................................... 1-6 Newly designed four carburetors ............................................................... 1-6 CDI unit with microcomputer ..................................................................... 1-7 Lower unit .................................................................................................. 1-8 Technical tips ............................................................................................... 1-10 Carburetor ............................................................................................... 1-10 Acceleration pump ................................................................................... 1-15 Ignition system......................................................................................... 1-17 Ignition timing control............................................................................... 1-19 Power trim and tilt .................................................................................... 1-22 Propeller selection ....................................................................................... 1-32 Propeller size ........................................................................................... 1-32 Selection .................................................................................................. 1-32 Predelivery checks ...................................................................................... 1-33 Checking the fuel system ........................................................................ 1-33 Checking the gear oil ............................................................................... 1-33 Checking the engine oil ........................................................................... 1-33 Checking the battery................................................................................ 1-33 Checking the outboard motor mounting position ..................................... 1-34 Checking the remote control cables ........................................................ 1-34 Checking the steering wheel/tiller handle ................................................ 1-34 Checking the gearshift and throttle operation .......................................... 1-34 Checking the tilt system........................................................................... 1-35 Checking the engine start switch and engine stop switch/engine shut-off switch ............................................. 1-35 Checking the pilot water outlet ................................................................ 1-35 Test run ................................................................................................... 1-35 Break-in ................................................................................................... 1-36 After test run ............................................................................................ 1-36
GEN INFO General information 1-162Y3A11 How to use this manual1 Manual format The format of this manual has been designed to make service procedures clear and easy to under- stand. Use the information below as a guide for effective and quality service. 1 Parts are shown and detailed in an exploded diagram and are listed in the components list. 2 Tightening torque specifications are provided in the components list at the beginning of each section and after a numbered step with tightening instructions. 3 Symbols are used to indicate important aspects of a procedure, such as the grade of lubricant and lubrication point. 4 The components list consist of parts and part quantities, as well as bolt and screw dimensions. 5 Service points regarding removal, checking, and installation are shown in individual illustrations to explain the relevant procedure. 6 This service manual has two types of special service tools. Use part numbers that start with “J-”, “YB-”, “YM-”, “YS-”, “YU-”, “YW-”, or “YX-” for USA and Canada. Use parts numbers that start with “90890-” for all other countries. POWRPower unit 5-3562Y1A11 Cylinder head 62Y1A115-36 5 È Tightening sequence No. Part name Q’ty RemarksTightening torques Stage N·mkgf·mft·lb 1 Cylinder head 1 2Oil pum p1 3 Cylinder head cover 1 4Bolt 7 M6 × 20 mm 5 Cylinder head cover gasket1 Not reusable 6 Bolt 10 M9 × 95 mm 1st 2nd23 472.3 4.717 34 7 Spark plug 4 18 1.8 13 8Bolt 5 M6 × 25 mm 1st 2nd6 120.6 1.24.3 8.7 9 Dowel pin 2 10 Cylinder head gasket 1 Not reusable11 Grommet 4 12 Anode 4 13 Cover 4 14 Bolt 4 15 Cover 4 16 Bolt 4 17 O-ring 1 Not reusable18 O-ring 1Not reusable19 O-ring 1Not reusable20 Bolt 4 M6 × 40 mm 21 Housing 1 22 Drive shaft 1 23 Pin 1 24 Inner rotor 1 25 Outer rotor 1 26 Gasket 1 Not reusable27 Cover 1 28 Screw 2 M6 × 20 mm Cylinder head POWRPower unit 5-3162Y1A11 Removing the timing belt and sprockets 1. Set the cylinder #1 piston position to TDC of the compression stroke by align- ing the “1” mark a on the driven sprocket with the “” mark b on the cylinder head. CAUTION:Do not turn the drive sprocket counter- clockwise, otherwise the valve system may be damaged. 2. Remove the breather hose and loosen the drive sprocket nut 1 . NOTE: Use a deep socket 2 (M42) for this proce- dure. Do not turn the camshaft when loosening the drive sprocket nut.3. Remove the tensioner 4 and timing belt 5 from the driven sprocket side. 4. Loosen the driven sprocket bolt 6 and remove the driven sprocket . ÈFor USA and Canada ÉFor worldwide NOTE: Do not turn the camshaft when loosening the driven sprocket bolt. Crankshaft holder 3 : YB-06562 Crankshaft holder 18 3 : 90890-06562 Flywheel magnet holder: YB-06139 Flywheel holder: 90890-06522
62Y3A111-2 1 2 3 4 5 6 7 8 I Symbols The symbols below are designed to indicate the content of a chapter. General information Specifications Periodic checks and adjustments Fuel systemPower unit Lower unit Bracket unit Electrical systems Symbols 1 to 5 in an exploded diagram indicate the grade of lubricant and the lubrication point. 1Apply Yamaha 4-stroke motor oil 2Apply water resistant grease (Yamaha grease A, Yamaha marine grease) 3Apply molybdenum disulfide grease 4Apply anti-corrosion grease (Yamaha grease D) 5Apply low temperature resistant grease (Yamaha grease C) Symbols 6 to A in an exploded diagram indicate the type of sealant or locking agent and the appli- cation point. 6Apply Gasket Maker® 7Apply Yamabond No. 4 8Apply LOCTITE ® No. 271 (Red LOCTITE) 9Apply LOCTITE® No. 242 (Blue LOCTITE) 0Apply LOCTITE® No. 572 AApply silicon sealant GEN INFO SPEC CHK ADJ FUEL POWR LOWR BRKT ELEC –+ 12345 67890A E AMDC GM4 271 LT 242 LT 572 LTSS How to use this manual
GEN INFO General information 1-362Y3A11 Safety while working1 To prevent an accident or injury and to ensure quality service, follow the safety pro- cedures provided below. Fire prevention Gasoline is highly flammable. Keep gasoline and all flammable products away from heat, sparks, and open flames. Ventilation Gasoline vapor and exhaust gas are heavier than air and extremely poisonous. If inhaled in large quantities they may cause loss of consciousness and death within a short time. When test running an engine indoors (e.g., in a water tank) be sure to do so where ade- quate ventilation can be maintained. Self-protection Protect your eyes by wearing safety glasses or safety goggles during all operations involv- ing drilling and grinding, or when using an air compressor. Protect your hands and feet by wearing pro- tective gloves and safety shoes when neces- sary. Parts, lubricants, and sealants Use only genuine Yamaha parts, lubricants, and sealants or those recommended by Yamaha, when servicing or repairing the outboard motor. Under normal conditions, the lubricants men- tioned in this manual should not harm or be hazardous to your skin. However, you should follow these precautions to minimize any risk when working with lubricants. 1. Maintain good standards of personal and industrial hygiene. 2. Change and wash clothing as soon as possible if soiled with lubricants. 3. Avoid contact with skin. Do not, for example, place a soiled rag in your pocket. 4. Wash hands and any other part of the body thoroughly with soap and hot water after contact with a lubricant or lubricant soiled clothing has been made. 5. To protect your skin, apply a protective cream to your hands before working on the outboard motor.
62Y3A111-4 1 2 3 4 5 6 7 8 I 6. Keep a supply of clean, lint-free cloths for wiping up spills, etc. Good working practices Special tools Use the recommended special tools to pro- tect parts from damage. Use the right tool in the right manner—do not improvise. Tightening torques Follow the tightening torque specifications provided throughout the manual. When tight- ening nuts, bolts, and screws, tighten the large sizes first, and tighten fasteners starting in the center and moving outward. Non-reusable parts Always use new gaskets, seals, O-rings, cot- ter pins, circlips, etc., when installing or assembling parts. Disassembly and assembly 1. Use compressed air to remove dust and dirt during disassembly. 2. Apply engine oil to the contact surfaces of moving parts before assembly.3. Install bearings with a manufacture iden- tification mark in the direction indicated in the installation procedure. In addition, be sure to lubricate the bearings liberally. 4. Apply a thin coat of water-resistant grease to the lip and out periphery of an oil seal before installation. 5. Check that moving parts operate nor- mally after assembly. Safety while working
GEN INFO General information 1-562Y3A11 Identification1 Applicable models This manual covers the following models. Serial number The outboard motor serial number is stamped on a label attached to the port clamp bracket. 1Model name 2Approved model code 3Transom height 4Serial number Applicable models USA, Canada Worldwide —F50AEHD F50TH F50AEHT —F50AED F50TR F50AET T50TR FT50BET —FT50CEHD —FT50CED —FT50CET Model nameApproved model codeStarting serial No. USA, Canada F50TH 62YL: 451812– F50TR L: 421732– T50TR 64J L: 406850– Worldwide F50AEHD 62YL: 350505– F50AEHTL: 451812– X: 750469– F50AED L: 301090– F50AETL: 421626– X: 700700– FT50BET 64JL: 406850– FT50CEHD L: 650101– FT50CED L: 550101– FT50CET L: 450101–