Mercury 9.9 TwoStroke Operation, Maintenance & Installation Manual
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Mercury 9.9 TwoStroke Operation, Maintenance & Installation Manual

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Richard N Miller
March 14, 2025

my 9.9 does not have these lube ports, it is an electric start model.

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Summary of Contents for Mercury 9.9 TwoStroke

  • Page 1 Operation Maintenance Installation Manual...
  • Page 3 Thank you for purchasing one of our products. We sincerely hope your boating will be pleasant! Mercury Marine, Fond du Lac, Wisconsin, U.S.A. Name / function: John Pfeifer, President, Mercury Marine...
  • Page 4 Warranty Message The product you have purchased comes with a limited warranty from Mercury Marine; the terms of the warranty are set forth in the Warranty Manual included with the product. The Warranty Manual contains a description of what is...
  • Page 5 Copyright and Trademark Information © MERCURY MARINE. All rights reserved. Reproduction in whole or in part without permission is prohibited. Alpha, Axius, Bravo One, Bravo Two, Bravo Three, Circle M with Waves Logo, K‑planes, Mariner, MerCathode, MerCruiser, Mercury, Mercury with Waves...

  • Page 7: Table Of Contents

    General Information Boater's Responsibilities..................1 Before Operating Your Outboard................ 1 Boat Horsepower Capacity................. 1 Outboard Remote Control Models ..............2 Remote Steering Notice..................3 Lanyard Stop Switch................... 3 Protecting People in the Water................6 Passenger Safety Message ‑ Pontoon Boats and Deck Boats......6 Wave and Wake Jumping...................
  • Page 8 Features and Controls Remote Control Features................. 32 Tilt Up and Tilt Down..................32 Shallow Water Operation.................. 34 Trim Angle Adjustment..................35 Steering Friction Adjustment................36 Throttle Grip Turning Friction Adjustment............37 Trim Tab Adjustment..................37 Operation Prestarting Check List..................40 Operating in Freezing Temperatures..............
  • Page 9 Engine Will Not Start..................71 Engine Runs Erratically..................71 Performance Loss..................... 72 Battery Will Not Hold Charge................72 Installation Mercury Marine Validated Engine Mounting Hardware........73 Installing Outboard.................... 73 Installing the Remote Control Devices.............. 75 Wire Color Code Abbreviations................ 80 Battery Installation.................... 81 Propeller Selection....................
  • Page 10 Owner Service Assistance Service Assistance................... 94 Ordering Literature.................... 96 Maintenance Log Maintenance Log....................98 viii...

  • Page 11: General Information

    GENERAL INFORMATION Boater's Responsibilities The operator (driver) is responsible for the correct and safe operation of the boat and the safety of its occupants and general public. It is strongly recommended that each operator read and understand this entire manual before operating the outboard.

  • Page 12: Outboard Remote Control Models

    GENERAL INFORMATION Do not overpower or overload your boat. Most boats will carry a required capacity plate indicating the maximum acceptable power and load as determined by the manufacturer following certain federal guidelines. If in doubt, contact your dealer or the boat manufacturer. U.S.

  • Page 13: Remote Steering Notice

    GENERAL INFORMATION Remote Steering Notice WARNING Improper fasteners or improper installation procedures can result in loosening or disengagement of the steering link rod. This can cause a sudden, unexpected loss of boat control, resulting in serious injury or death due to occupants being thrown within or out of the boat. Always use required components and follow instructions and torque procedures.
  • Page 14 GENERAL INFORMATION The lanyard cord is usually 122–152 cm (4–5 feet) in length when stretched out, with an element on one end made to be inserted into the switch and a clip on the other end for attaching to the operator's PFD or wrist. The lanyard is coiled to make its at‑rest condition as short as possible to minimize the likelihood of lanyard entanglement with nearby objects.
  • Page 15 GENERAL INFORMATION While activation of the lanyard stop switch will stop the engine immediately, a boat will continue to coast for some distance depending upon the velocity and degree of any turn at shut down. However, the boat will not complete a full circle.

  • Page 16: Protecting People In The Water

    GENERAL INFORMATION Protecting People in the Water WHILE YOU ARE CRUISING It is very difficult for a person standing or floating in the water to take quick action to avoid a boat heading in his/her direction, even at slow speed. 21604 Always slow down and exercise extreme caution any time you are boating in an area where there might be people in the water.
  • Page 17 GENERAL INFORMATION Persons on the front deck could easily be thrown overboard or persons dangling their feet over the front edge could get their legs caught by a wave and pulled into the water. 26782 WARNING Sitting or standing in an area of the boat not designed for passengers at speeds above idle can cause serious injury or death.

  • Page 18: Wave And Wake Jumping

    GENERAL INFORMATION Wave and Wake Jumping Operating recreational boats over waves and wake is a natural part of boating. However, when this activity is done with sufficient speed to force the boat hull partially or completely out of the water, certain hazards arise, particularly when the boat enters the water.

  • Page 19: Impact With Underwater Hazards

    GENERAL INFORMATION Impact with Underwater Hazards Reduce speed and proceed with caution whenever you drive a boat in shallow water areas, or in areas where you suspect underwater obstacles may exist which could be struck by the outboard or the boat bottom. The most important thing you can do to help reduce injury or impact damage from striking a floating or underwater object is to control the boat speed.

  • Page 20: Safety Instructions For Hand-Tilled Outboards

    Operating a boat or engine with impact damage can result in product damage, serious injury, or death. If the vessel experiences any form of impact, have an authorized Mercury Marine dealer inspect and repair the vessel or power package. Safety Instructions for Hand‑Tilled Outboards No person or cargo should occupy the area directly in front of the outboard while the boat is in motion.
  • Page 21 GENERAL INFORMATION WARNING Inhaling engine exhaust gases can result in carbon monoxide poisoning, which can lead to unconsciousness, brain damage, or death. Avoid exposure to carbon monoxide. Stay clear from exhaust areas when engine is running. Keep the boat well‑ventilated while at rest or underway. STAY CLEAR OF EXHAUST AREAS 41127 Engine exhaust gases contain harmful carbon monoxide.

  • Page 22: Selecting Accessories For Your Outboard

    Some accessories not manufactured or sold by Mercury Marine are not designed to be safely used with your outboard or outboard operating system. Acquire and read the installation, operation and maintenance manuals for all your selected accessories.
  • Page 23 GENERAL INFORMATION • We recommend that all powerboat operators complete a boating safety course. In the U.S., the U.S. Coast Guard Auxiliary, the Power Squadron, the Red Cross, and your state or provincial boating law enforcement agency provide courses. For more information in the U.S., call the Boat U.S.
  • Page 24 (refer to your boat's capacity plate). Know your boat's operating and loading limitations. Know if your boat will float if it is full of water. When in doubt, contact your authorized Mercury Marine dealer or the boat manufacturer. Ensure that everyone in the boat is properly seated.

  • Page 25: Recording Serial Number

    GENERAL INFORMATION • Boat operators are required by law to file a boating accident report with their state boating law enforcement agency when their boat is involved in certain boating accidents. A boating accident must be reported if 1) there is loss of life or probable loss of life, 2) there is personal injury requiring medical treatment beyond first aid, 3) there is damage to boats or other property where the damage value exceeds $500.00, or 4) there is...
  • Page 26 GENERAL INFORMATION Model Year Manufactured Code Alpha Production Code Corresponding Number Examples: • XX = 2000 • HK = 2089 • AG = 2017...

  • Page 27: Specifications

    Trim system Manual, 6 positions Mercury/Quicksilver 2‑Stroke engine oil: Unleaded Engine oil mixing ratio gasoline 1:50 Mercury/Quicksilver gear oil API GL5, SAE #80–90 Gear oil approximately 370 mL (12.5 oz) Fuel tank capacity 25 Liter (6.6 US gal) Gear reduction ratio...
  • Page 28 Trim system Manual, 6 positions Mercury/Quicksilver 2‑Stroke engine oil: Unleaded Engine oil mixing ratio gasoline 1:50 Mercury/Quicksilver gear oil API GL5, SAE #80–90 Gear oil approximately 370 mL (12.5 oz) Fuel tank capacity 25 Liter (6.6 US gal) Gear reduction ratio...
  • Page 29 Manual, 6 positions Mercury/Quicksilver 2‑Stroke engine oil: Unleaded Engine oil mixing gasoline ratio 1:50 Mercury/Quicksilver gear oil API GL5, SAE #80–90 Gear oil approximately 370 mL (12.5 oz) Fuel tank capacity 25 Liter (6.6 US gal) Gear reduction ratio 13:24 (1.84:1)

  • Page 30: Component Identification

    GENERAL INFORMATION Component Identification 40465...
  • Page 31 GENERAL INFORMATION MH Models Tilt handle Top cowl Bottom cowl Reverse lock lever Water pump indicator hole Driveshaft housing Water strainer Anti‑ventilation plate Anode/trim tab 10 - Secondary water intake 11 - Propeller 12 - Oil drain plug (upper) 13 - Water plug 14 - Oil drain plug (lower)
  • Page 32 GENERAL INFORMATION 40466...
  • Page 33 GENERAL INFORMATION EH Models Tilt handle Top cowl Bottom cowl Reverse lock lever Water pump indicator hole Driveshaft housing Water strainer Anti‑ventilation plate Anode/trim tab 10 - Secondary water intake 11 - Propeller 12 - Oil drain plug (upper) 13 - Water plug 14 - Oil drain plug (lower)
  • Page 34 GENERAL INFORMATION 40467...

  • Page 35: Associated Parts

    GENERAL INFORMATION E Models 18 - Starter switch button Tilt handle 19 - Choke knob Top cowl 20 - Fuel hose connector Bottom cowl 21 - Throttle grip Reverse lock lever 22 - Clamp screws Water pump indicator hole 23 - Transom brackets Driveshaft housing 24 -...

  • Page 36: Transporting

    TRANSPORTING Removing the Motor 1. Stop the engine. 2. Disconnect the fuel connector, the remote control cable, the battery cables, bracket fixing bolts and nuts, etc. from the motor. 3. Remove the motor from the hull and completely drain the water from the gear housing.

  • Page 37: Trailering Boat/Outboard

    TRANSPORTING Trailering Boat/Outboard The boat should be trailered with the outboard tilted down in a vertical (normal running) position, fully down. NOTE: Trailering in the tilted position may cause damage to the motor, boat, etc. If trailering with the motor fully down is not available (the gearcase skeg is too close to the road in a vertical position), secure the motor using a device like a transom saver bar in the tilted position.

  • Page 38: Transporting Portable Fuel Tanks

    TRANSPORTING Transporting Portable Fuel Tanks WARNING Avoid serious injury or death from a gasoline fire or explosion. Follow the transporting instructions supplied with the portable fuel tank. Transport the fuel tank in a well ventilated area away from open flame or sparks. MANUAL VENTING TYPE FUEL TANK Close the fuel tank air vent when transporting tank.

  • Page 39: Fuel And Oil

    USA is alcohol (ethanol, methanol, or butanol). GASOLINE CONTAINING ALCOHOL Bu16 Butanol Fuel Blends Fuel blends of up to 16.1% butanol (Bu16) that meet the published Mercury Marine fuel rating requirements are an acceptable substitute for unleaded gasoline. Contact your boat manufacturer for specific recommendations on your boat's fuel system components (fuel tanks, fuel lines, and fittings).

  • Page 40: Oil Recommendation

    Mercury or Quicksilver Premium TC‑W3 2‑Cycle oil is recommended for this engine. For added protection and lubrication, Mercury or Quicksilver Premium Plus TC‑W3 2‑Cycle oil is recommended. If Mercury or Quicksilver outboard oil is not available, substitute another brand of 2‑cycle outboard oil that is NMMA Certified TC‑W3.

  • Page 41: Engine Break-In

    FUEL AND OIL MIXING PROCEDURE Pour the full amount of oil, along with one gallon of gasoline, into an approved container. Shake the two together until they are thoroughly mixed. Add the remainder of gasoline and shake container to ensure mixing. Engine Break‑In ENGINE BREAK-IN FUEL MIXTURE Use a 1:25 oil/gasoline mixture in the first tank of fuel.

  • Page 42: Features And Controls

    FEATURES AND CONTROLS Remote Control Features Your boat may be equipped with the remote control shown. If not, consult your dealer for a description of the functions and operations of the remote control. 37982 Remote control handle Throttle only lever Ignition key switch Lanyard stop switch Tilt Up and Tilt Down...
  • Page 43 FEATURES AND CONTROLS 2. With the shift lever in Neutral (N) or Forward (F), fully tilt the motor up toward by holding the tilt handle provided at the rear of the upper motor cover. 27023 3. Tilt up: Push the reverse lock lever down until it stops. This is the tilt up position.

  • Page 44: Shallow Water Operation

    FEATURES AND CONTROLS Shallow Water Operation IMPORTANT: When in shallow water operation, be careful not to place your hand between the swivel bracket and the stern bracket. Be sure to tilt the outboard down slowly. NOTE: Slow down to trolling speed, and shift to Neutral (N) before operating in shallow water.

  • Page 45: Trim Angle Adjustment

    FEATURES AND CONTROLS NOTE: Please follow the instructions below: • Ensure that the water inlet is submerged at all times and that water is continuously running out of the cooling water check port. • Be sure to run the engine slowly when using the shallow water drive. Running at higher speed will result in lack of control and may damage the engine.

  • Page 46: Steering Friction Adjustment

    FEATURES AND CONTROLS • Trim up: If the trim angle is too small, the bow will enter the water, the speed will decrease, and water may enter the boat. In this case, the trim angle should be increased by setting the trim position pin in a higher position.

  • Page 47: Throttle Grip Turning Friction Adjustment

    FEATURES AND CONTROLS • Turn counterclockwise for less friction. Steering co‑pilot 40867 NOTE: The steering adjustment bolt is used to adjust the sliding friction of the steering, but not to correct the steering. If excess tightening is given to the bolt, it may cause damage to the swivel bracket.
  • Page 48 FEATURES AND CONTROLS • If adjustment is necessary, loosen the trim tab bolt and make small adjustments at a time. • After the adjustment, securely tighten the trim tab bolt. NOTE: Check for looseness of the bolt and the trim tab at regular intervals. Due to corrosion, the trim tab will wear down over time.
  • Page 49 FEATURES AND CONTROLS REMOTE CONTROL LEVER FRICTION (THROTTLE FRICTION ADJUSTMENT SCREW) To adjust the friction of the remote control lever, turn the throttle friction adjustment screw on the front of the remote control box. Turn clockwise to increase the friction and counterclockwise to decrease it. Turn counterclockwise to decrease the friction Turn clockwise to increase the...

  • Page 50: Operation

    Wash the outboard exterior and flush out the exhaust outlet of the propeller and gearcase with fresh water after each use. Each month, spray Mercury Precision or Quicksilver Corrosion Guard on external metal surfaces. Do not spray on...

  • Page 51: Operating At High Elevations

    OPERATION Operating at High Elevations IMPORTANT: To prevent serious damage to the engine caused by a lean fuel mixture, do not operate your outboard (if the jets were changed for high elevation) at a lower elevation unless the jets are changed again to correspond to the new elevation.

  • Page 52: Engine Break-In Procedure

    IMPORTANT: Failure to follow the engine break‑in procedures can result in poor performance throughout the life of the engine and can cause engine damage. Always follow break‑in procedures. ENGINE OIL Use Mercury or Quicksilver engine oil or the other recommended oil (TC‑W3).

  • Page 53: Warming Up The Engine

    Mixing ratio (1:50): Mercury or Quicksilver engine oil or recommended engine oil (TC‑W3), 1:Unleaded gasoline 50. ENGINE BREAK-IN FUEL MIXTURE Use a 1:25 oil/gasoline mixture in the first tank of fuel. Use Mercury or Quicksilver engine oil or the recommended oil (TC‑W3). BREAK-IN Break‑in period for 10 hours...

  • Page 54: Starting The Engine

    OPERATION NOTE: If the engine is operated continuously without water discharging from the water pump indicator or idle hole, the engine may overheat. Water pump indicator Idle hole 40472 Engine speeds: Idling speed after warming up. In gear In Neutral 800 RPM 950 RPM Starting the Engine...
  • Page 55 OPERATION IMPORTANT: If the motor somehow does start in gear, do not use it. Contact your authorized dealer. 2. Turn the throttle grip until the mark on the grip faces the triangular mark on the steering handle. 28847 3. Pull the choke knob out all the way. The choke operation is not necessary when the engine is warm.
  • Page 56 OPERATION 5. EH Models: Push the starter switch button. Starter switch button 39481 6. Release the button when the engine has started. IMPORTANT: If the choke knob was used for the engine start, push it back when the engine has started. 7.

  • Page 57: Gear Shifting

    OPERATION NOTE: Choke operation is not necessary if the engine is warm. Push to operate choke 37466 10. Stop pushing the key when the engine has started. The key returns to the original position automatically. NOTE: The neutral warm‑up lever cannot be raised when the control lever shift is in Forward (F) or Reverse (R).
  • Page 58 OPERATION 2. Reverse: As when shifting to Forward (F), reduce the engine speed, when the engine reaches trolling speed, quickly push the shift lever to Reverse (R) position. Reverse (R) Forward (F) 37713 E Models 1. Forward: Quickly push the control lever to the Forward (F) position at 32°, where the gear is connected, while lifting up on the lock button located at the bottom of the control lever grip.

  • Page 59: Stopping The Engine

    OPERATION NOTE: Do not increase the engine speed unnecessarily when operating the neutral warm‑up lever. 39483 Fully open Throttle Forward (F) Shift Neutral (N) Reverse (R) Fully closed Neutral warm‑up lever Lock button Stopping the Engine MH and EH Models 1.
  • Page 60 OPERATION 3. Push the stop switch to stop the engine. 37877 E Models 1. Put the shift lever into the Neutral (N) position and run the engine for 2–3 minutes at idling speed. 37882...

  • Page 61: Emergency Starting

    OPERATION 2. Turn the main switch key to the off position or pull out the lanyard stop switch lock. Hook Lanyard stop switch lock 37716 IMPORTANT: Please follow the instructions below: • After stopping the engine, close the air vent screw on the tank cap. •...
  • Page 62 OPERATION WARNING High voltage is present any time the key is turned on, especially when starting or operating the engine. Do not touch ignition components or metal test probes and stay clear of spark plug leads when performing live tests. WARNING The exposed moving flywheel can cause serious injury.

  • Page 63: Maintenance

    Record maintenance performed in the Maintenance Log at the back of this book. Save all maintenance work orders and receipts. Selecting Replacement Parts For Your Outboard We recommend using original Mercury Precision or Quicksilver replacement parts and Genuine Lubricants. DO NOT USE CAUSTIC CLEANING CHEMICALS IMPORTANT: Do not use caustic cleaning chemicals on the outboard power package.

  • Page 64: Outboard Care

    4. Wax the surface using a nonabrasive automotive polish (polish designed for clear coat finishes). Remove the applied wax by hand using a clean soft cloth. 5. To remove minor scratches, use Mercury Marine Cowl Finishing Compound (92‑859026K 1). Outboard Care...
  • Page 65 MAINTENANCE • Inspect the fuel system for leaks • Inspect the engine tightness on the transom • Check the steering system for binding • Check the propeller for damage • Inspect the hydraulic steering fittings and hoses for leaks or signs of damage, if equipped •...

  • Page 66: Flushing The Cooling System

    This will help prevent a buildup of deposits from clogging the internal water passages. Use a Mercury Precision or Quicksilver accessory (or equivalent) flushing attachment. IMPORTANT: The engine must be run during flushing in order to open the thermostat and circulate water through the water passages.

  • Page 67: Top Cowl Removal And Installation

    MAINTENANCE 2. Attach a water hose to the flushing attachment. Turn on the water and adjust the flow so water is leaking around the rubber cups to ensure the engine receives an adequate supply of cooling water. 27259 3. Start the engine and run it at idle speed in neutral shift position. IMPORTANT: Do not run the engine above idle when flushing.

  • Page 68: Battery Inspection

    MAINTENANCE 2. Lift rear of cowl and disengage front hook. 26851 INSTALLATION 1. Engage the front hook and push cowl back over the cowl seal. 2. Push cowl down and move the rear latch lever up to lock. Battery Inspection The battery should be inspected at periodic intervals to ensure proper engine starting capability.
  • Page 69 MAINTENANCE FUEL LINE INSPECTION Visually inspect the fuel line and primer bulb for cracks, swelling, leaks, hardness, or other signs of deterioration or damage. If any of these conditions are found, the fuel line or primer bulb must be replaced. ENGINE FUEL FILTER Inspect the sight bowl for water accumulation and inspect the filter element for sediment.

  • Page 70: Exterior Care

    MAINTENANCE 2. Engine filter: Remove cap, then clean the fuel filter in the engine. 40475 Carburetor Fuel filter 3. Fuel tank: Water or dirt in the fuel tank may cause engine trouble. Clean the tank at specified times or after the motor has been stored for a long period (over three months).

  • Page 71: Replacing The Anodes

    MAINTENANCE The electric starting circuit is protected from overload by an SFE 20 amp fuse. If the fuse is blown, the electric starter motor will not operate. Try to locate and correct the cause of the overload. If the cause is not found, the fuse may blow again.

  • Page 72: Propeller Replacement

    MAINTENANCE Propeller Replacement WARNING Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed. Before installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the engine from starting.
  • Page 73 38055 Cotter pin Washer Propeller Thrust hub 5. Coat the propeller shaft with Mercury Extreme Grease or 2‑4‑C with PTFE. 27305 Tube Ref Description Where Used Part No.
  • Page 74 MAINTENANCE 6. Install forward thrust hub, propeller, washer, nut, and cotter pin onto the propeller shaft. 37520 Cotter pin Washer Propeller Forward thrust hub Propeller shaft 7. Place a block of wood between the gearcase and propeller and tighten the propeller nut. 27341 8.

  • Page 75: Spark Plug Inspection And Replacement

    MAINTENANCE Spark Plug Inspection and Replacement WARNING Damaged spark plug boots may emit sparks that can ignite fuel vapors under the engine cowl, resulting in serious injury or death from a fire or explosion. To avoid damaging the spark plug boots, do not use any sharp object or metal tool to remove the spark plug boots.

  • Page 76: Lubrication Points

    Spark plug – Lubrication Points Only let an authorized Mercury dealer perform service or maintenance on this product. Be sure to use genuine parts, genuine lubricants, or recommended lubricants. Changing Gear Oil 1. Place the outboard in a vertical operating position.

  • Page 77: Submerged Outboard

    MAINTENANCE IMPORTANT: Use Mercury/Quicksilver gear oil or the recommended one (APL GL‑5: SAE #80–#90). Required volume: 370 ml (0.10 US gal). Submerged Outboard A submerged outboard will require service within a few hours by an authorized dealer once the outboard is recovered from the water. This immediate attention by a servicing dealer is necessary once the engine is exposed to the atmosphere to minimize internal corrosion damage to the engine.

  • Page 78: Preseason Check

    STORAGE Preseason Check 1. Check the electrolyte level, and measure the voltage and specific gravity of the battery. Specific Gravity at 20 °C Terminal Voltage (V) Charge Condition 1.120 10.5 Fully discharged 1.160 11.1 1/4 charged 1.210 11.7 1/2 charged 1.250 12.0 3/4 charged...

  • Page 79: Protecting External Outboard Components

    Lubricate all outboard components listed in Maintenance ‑ Inspection and Maintenance Schedule. • Touch up any paint nicks. See your dealer for touch‑up paint. • Spray Quicksilver or Mercury Precision Lubricants Corrosion Guard on external metal surfaces (except corrosion control anodes). Tube Ref Description Where Used Part No.

  • Page 80: Battery Storage

    STORAGE Battery Storage • Follow the battery manufacturer's instructions for storage and charging. • Remove the battery from the boat and check water level. Charge if necessary. • Store the battery in a cool, dry place. • Periodically check the water level and charge the battery during storage.

  • Page 81: Troubleshooting

    TROUBLESHOOTING Starter Motor Will Not Crank the Engine (Electric Start Models) POSSIBLE CAUSES • Remote control models ‑ Blown 20 amp fuse in the starting circuit. Refer to Maintenance section. • Outboard is not shifted to neutral position. • Weak battery or battery connections are loose or corroded. •...

  • Page 82: Performance Loss

    TROUBLESHOOTING • Ignition system component failure. Performance Loss POSSIBLE CAUSES • Throttle not fully open. • Damaged or improper size propeller. • Incorrect engine timing, adjustments, or setup. • Boat overloaded or load improperly distributed. • Excessive water in bilge. •...

  • Page 83: Installation

    INSTALLATION Mercury Marine Validated Engine Mounting Hardware IMPORTANT: Mercury Marine provides validated fasteners and installation instructions, including torque specifications, with all of our outboards so they can be properly secured to boat transoms. Improper installation of the outboard can cause performance and reliability issues that can lead to safety concerns.
  • Page 84 INSTALLATION 1. Single engine: Position the outboard motor at the center of the transom. Mount it using a cushioning pad or plate. Boat transom 37508 2. Twin engine: Position the outboard engines approximately 580 mm (22.8 in.) apart, measured from the centerline of each engine, and equal distance (a) from the center of the transom.

  • Page 85: Installing The Remote Control Devices

    INSTALLATION 4. Clearance between the anti‑ventilation plate of the motor and the bottom of the boat must be 30–50 mm (1.2–2 in.). If the height difference exceeds 50 mm (2 in.), engine power performance is likely to be reduced as a result of increased water resistance to the gearcase assembly.
  • Page 86 INSTALLATION 2. Installation of the remote control box: Follow the instruction sheet provided with the remote control box. 37529 3. Installing of the remote control cable (engine side) and the harness assembly (wiring harness). a. Fitting of throttle cable and shift cable guide: •...
  • Page 87 INSTALLATION • Shift side: Attach the shift cable adapter to the end of the cable and secure it with the nut. 40469 Cable outer groove Shift cable Shift cable adapter Lock pin Spring Spring pin b. Fitting of remote control cable to the engine: •...
  • Page 88 INSTALLATION • Shift side: Set the shift cable to the cable clip and insert the lock pin at the shift lever fitting hole and turn it 90° to lock it. 40470 Cable of the shift side Lock pin Spring Shift cable adapter Spring pin Shift lever Advancer arm...
  • Page 89 INSTALLATION Cable clip Lower cowl Clamp Steering hook plate Shift cable clip NOTE: Put the control lever in the Neutral (N) position and the neutral warm‑up lever in the fully closed position. NOTE: Confirm whether the engine side shift is in gear when shifting the control lever of the remote control box to its first position in Forward (F) or Reverse (R), about 32°, and whether the throttle of the carburetor is fully open when shifting the lever further.

  • Page 90: Wire Color Code Abbreviations

    INSTALLATION • Secure the cable assembly with the clamp according to the drawing below. 40471 Clamp Starter solenoid Fuse wire Choke solenoid Rectifier From the remote control box Battery cable Cable assembly Wire Color Code Abbreviations Wire Color Abbreviations Black Blue Brown Gray...

  • Page 91: Battery Installation

    INSTALLATION Battery Installation MOUNTING BATTERY Follow the battery manufacturer's instructions carefully. Mount battery securely to the hull in a place free from splashing water. NOTE: Electric starting outboards must have the battery cables connected to a battery whenever the engine is running, even if started manually, as damage to the charging system could result.

  • Page 92: Propeller Selection

    INSTALLATION Propeller Selection The propeller supplied with your outboard provides the best overall performance under average operating conditions. A propeller must be selected so that the engine RPM when cruising with a wide‑open throttle, is within the recommended range. Model Wide‑open throttle RPM range 4500–5300 RPM 15/18...

  • Page 93: Propeller Table

    ACCESSORIES Propeller Table Use a Mercury/Quicksilver propeller. A propeller must be selected so that the engine RPM measured at wide‑open throttle while cruising is within the recommended range: 9.9 HP = 4500–5300 RPM; 15/18 HP = 5200–5800 RPM. Transom height: S = short, L = long, XL = extra long...

  • Page 94: Accessories

    ACCESSORIES Accessories OPTIONAL ACCESSORIES 40476...
  • Page 95 ACCESSORIES Tachometer unit kit Tachometer Mercury/Quicksilver grease (250 g) Mercury/Quicksilver gear oil (500 ml) Touch‑up paint Mercury/Quicksilver engine oil (0.4 L, 1 L, 4 L, 20 L) Flushing attachment Extension cord for light (lights are available on the market)

  • Page 96: Wiring Diagrams

    WIRING DIAGRAMS MH Models 39493...
  • Page 97 WIRING DIAGRAMS Remote control box (optional) Battery Extension cord (optional) Fuse Rectifier Extension cord for light (optional) Receptacle plug (optional) Lamp (12V 80W) [AC] (sold separately) Tachometer (optional) Tachometer, lead wire (optional) Separate cord, yellow (optional) Separate cord, white (optional) Flywheel magneto Spark plug Ignition coil...

  • Page 98: Eh Models

    WIRING DIAGRAMS EH Models 39494...
  • Page 99 WIRING DIAGRAMS Main switch Neutral switch Starter motor Starter cord Starter solenoid Fuse Rectifier Tachometer Tachometer lead wire (optional) Separate cord, yellow (optional) Separate cord, white (optional) Flywheel magneto Spark plugs Ignition coil Lanyard stop switch 12V 40AH or 12V 70AH (sold separately)

  • Page 100: E Models

    WIRING DIAGRAMS E Models 39495...
  • Page 101 WIRING DIAGRAMS Harness assembly 12V 40AH or 12V 70AH battery (sold separately) Tachometer Battery cable (+) Tachometer lead wire (optional) Fuse 15A Starter solenoid Rectifier Flywheel magneto Separate cord, white (optional) Separate cord, yellow (optional) Spark plugs Ignition coil CD unit Lead wire, black Lead wire, brown Starter motor...

  • Page 102: Single Remote Control Box

    WIRING DIAGRAMS Single Remote Control Box 39496...
  • Page 103 WIRING DIAGRAMS Neutral switch Main switch Stop switch Cord assembly...

  • Page 104: Service Assistance

    STOLEN POWER PACKAGE If your power package is stolen, immediately advise the local authorities and Mercury Marine of the model and serial numbers and to whom the recovery is to be reported. This information is maintained in a database at Mercury Marine to aid authorities and dealers in the recovery of stolen power packages.
  • Page 105 RESOLVING A PROBLEM Satisfaction with your Mercury product is important to your dealer and to us. If you ever have a problem, question or concern about your power package, contact your dealer or any authorized Mercury dealership. If you need additional assistance: 1.

  • Page 106: Ordering Literature

    Ordering Literature Before ordering literature, have the following information about your power package available: Model Serial Number Horsepower Year UNITED STATES AND CANADA For additional literature for your Mercury Marine power package, contact your nearest Mercury Marine dealer or contact:...
  • Page 107 (USA only) P.O. Box 1939 Fond du Lac, WI 54936-1939 OUTSIDE THE UNITED STATES AND CANADA Contact your nearest Mercury Marine authorized service center to order additional literature that is available for your particular power package. Mercury Marine Submit the following...

  • Page 108: Maintenance Log

    MAINTENANCE LOG Maintenance Log Record all maintenance performed on your outboard here. Be sure to save all work orders and receipts. Date Maintenance Performed Engine Hours...

This manual is also suitable for:

15 twostroke18 twostroke6 twostroke8 twostroke9.8 twostroke

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