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Mercury 50 User Manual

Outboard motor
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See also: Service Manual , Operation & Maintenance Manual
WBl, Brunswick Corporation

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  • Page 2: Important Information

    IMPORTANT INFORMATION DO NOT OPERATE YOUR NEW OUT- Because ol your valued investment we BOARD MOTOR AT FULL THROTTLE here at Mercury Marine also value you as a UNTIL THE SECOND HOUR OF BREAK- consumer c 3 f the finest outboard products I N IS COMPLETED.
  • Page 3 EAD THIS MANUAL TH you don't understand any portion, contact your dealer for a dernon- NOTICE A W A R N I N G Throughout this publication, a~nd on your The operator (driver) is responsible for the outboard, DANGER, WARNINGS and correct and safe operation of the boat, the CAUTIONS, accompan~ed b y the interna- equipment aboard and the safety of all...
  • Page 4 DISADVANTAGES: Inadvertent activation SERIOUS INJURY IS LIKELY IF A PER- TABLE OF CONTENTS the switch is also a possibility. This SON IN THE WATER IS STRUCK BY A could cause any or all of the following MOVING BOAT, GEAR HOUSING, PRO- potentially hazardous situations: PELLER, OR ACCESSORY RIGIDLY AT- Page...

  • Page 5: Specifications

    SPECIFICATIONS Recommended Spark Plug1 NGK BU8H Any leaded or unleaded (lead-free) gasoline, Recommended Gasol~ne with a minimum posted octane rating of 87 (research oztane number 90) Without Power Trim* Models Recommended Oil 2-Cycie Outboard Oil Minimum Reserve Capacity Rating of Battery Rating 100 Minutes and Cold Cranking Amperage of 350 Amperes...
  • Page 6 OUTBOARD MOTOR INSTALLATION holes. Installation must be water-tight, and AWARNING outboard should be checked for tightness DO NOT OVERPOWER Most boats are on the transom during operation. Failure to rated and certified for the maximum horse- bolt outboard to transom (usig 4 bolts and power capabilities of the boat.
  • Page 7 OUTBOARD MOTOR INSTALLATION (Continued) IMPORTANT The trim tab is made of spe- cial alloy to protect outboard housings Locks outboard in a fully tilted position. from galvanic corrosion. DO NOT paint or place proteche coating on the trim tab. Outboard must not be run i n full tilt lock position, as water pickups in lower unit BATTERY and ELECTRICAL would be out of the water and water pump...
  • Page 8 PROPELLER (Continued) ing correct propeller.) Normally, there PROPELLER SELECTION 300 to 500 RPM change between propeller PROPELLER REMOVAL pitches. Full throttle RPM range is listed tn sion Grease or 2-4-C M a r ~ n e Lubricant. SPECIFICATIONS. at or near top of reconimended full AWARNING throttle RPM range wtth a normal load If the engfne RPM during full throttle oper-...
  • Page 9 The adverse effects of alcohol are more oil mixture as shown o n the label, not to severe with methyl alcohol (methanol) and exceed 50:l are worse with increasing alcohol content.
  • Page 10 DO NOT EXCEED 50:l form gum and varnish deposits which Oils cause trouble. NOTE: The 50:l ratlo gasoline-oil in the Mix fuel directly into remote tank. Pour fuel tank combined with the metered oil small, equal amounts of gasoline and oil ratio supplied by the oil mjection system into tank.
  • Page 11 FUEL MIXTURE and GASOLINE/ OIL RECOMMEND (Continued) OIL INJECTION SYSTEM Filling Oil Injection System Oil Tank Capacity Warning hotn sounds momentarily as Tank Capa::ity ON. Horn sounds intermittently to indicate low oil supply. Horn sounds steadily to Maximum Operattng Time at indicate engine overheating.
  • Page 12 (Models without Power Trim) Models not equipped with power trim are Transfer steering torque harder to left on standard or slightly elevated transom equipped with a manual tilt assist system, height ~nstallations. that allows the operator to easily tilt and/or lock the outboard to any tilt angle, from full Increase clearance over submerged i n (down) position, to full out (up) position.
  • Page 13 REMOTE CONTROL COMPONENTS Engine can I,e restarted with or without Neutral Lock Bar prevents accidental lanyard cord/cl$p Installed by simply push- shift and throttleengagement. Bar must be ing switch u p to run position If necessary squeezed before control handle can be push switch d o m w ~ t h key to reinstall clip moved, from NEUTRAL.
  • Page 14 OPERATION ELS WITH REMOTE CONT (Continued) OPERATOR and PASSENGERS SHOULD BE SEATED WHENEVER ATTEMPTING DO NOT operate starter motor for longer to START the ENGINE. than seconds or starter motor may be damaged. Allow at least 2 minutes between Before attempting to start engine, MAKE CERTAIN that outboard is shifted into starting attempts.
  • Page 15 OPERATION MODELS WITH REMOTE CONTROL (Continued) STARTING WARM ENGINE on control kt, rldle to engage REVERSE Place contro handle In Neutral Turn key GEAR As soon as engine starts, allow key to return t o RUN p o s ~ t i o n . If englne falters. push in on key to actuate enrichener STOPPING THE ENGINE NOTE If e'tglne falls t o start, follow...
  • Page 16 COWL REMOVAL and INSTALLATION INSTALLATION Position cowl aver engine INSTALL COWL WHILE ENGINE IS RUN- NING. Lift u p on rea of cowl and tilt it forward slightly to engage front hook. REMOVAL Lower c o w l tn% p o s ~ t i o n and engage rear latch STOP ENGINE Push down to d~sengage cowl latch...
  • Page 17 EMERGENCY OPER Engage ktnot of starter rope in one of the flywheel notches arid wind rope clockwfse Battery leads must be connected to battery around flywheel (even if battery is dead). Turn key switch to RUN Remove cowl (refer to COWL REMOVAL and INSTALLATION.) enrichener.

  • Page 18: Power Trim

    Outboard can be trimmed beyond 20" limit for launchrng, trailering, shallow water Keep a tight grip on the steering wheell operation, etc.. if engine speed does not tiller handle, especially when changing exceed 2000 RPM. speed or trimming boat and outboard. Trim outboard after reaching cruising speed.
  • Page 19 TYPE OF SALT WATER LUBRICANT FRESH WATER FREQUENCY MAINTENANCE FREQUENCY ITEM DESCRIPTION Every 50 days Every 30 days Linkage (all Pivot Points) Every 60 days Tilt Lock Lever Swivel Pin/ Every 60 days Every 30 days Bracket Clean and Once a season...
  • Page 20 USING LUBRICATION (Continued) CAUTION Remove lubricant fill plug and washer. Note amount of metal particles on mag- plugs, as trapped air will prevent housing DRAINING and REFILLING GEAR netic fill plug. Refer to caution, preceding. service dealer if any of the following are from being tilied.
  • Page 21 IGNITION MAINTENANCE Remove cow (Refer tc COWL REMOVAL and INSTALLt'TION ) DO NOT touch or disconnect any ignition Disconnect spark plug leads and use system parts while engine is running, as 13/16 In (21 wrench to remove spark high voltage 1 s present. If electrical/ignition system is not operat- Check that gaskets are In place dnd ing, D O NOT attempt t o repair, but refer to...
  • Page 22 CLEANING FUEL FILTERS Clean f ~ l t e r b! rlnsrng In clean gasollne Be careful when cleaning fuel filter ele- ments; gasoline is extremely flammable and highly explosive under certain condi- tions. Always stop the engine and DO NOT smoke or allow open flames in the area If engrne 17-llne fuel f ~ l t e r (located on while cleaning fuel filter elements.

  • Page 23: Carburetor Adjustments

    CARBURETOR ADJUSTMENTS The carburetors have been cal~brated and Start engine Allow to run at IDLE for several minutt s pre-set at factory to provide best perfornl- With engine k t IDLE, shift to FORWARD extreme changes in weather and/or eleva- GEAR.
  • Page 24 INSTALLATION.) should be checkeci carefully, includ- ing all i-li,~G!b~ible t?nglne parts. ish. Use Quicksilverspray paints -see your Dealer. Inspect trim tab, Replace if 50% of tab has been eroded away. LUBRICATION GUIDE IMPORTANT: DO NOT apply paint or pro- spark plugs Check plug leads and tective coatings to trim tab.

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