The upper electrothermal valve controls fuel flow for carburetors 1 and 2, and the lower valve controls fuel flow for carburetors 3 and 4. This is conside red standard shop practice even if not specif- ically stated. Remove timing belt and driven sprockets. Remove cylinder head cover and spark plugs. Select a proper replacement valve pad by calculating its thickness with the following formula.
Loosen timing belt tensioner bolt and remove tensioner spring. Loosen timing belt tensioner and remove tensioner spring. Check that flywh eel is secur ed to end o f cra nk- shaft with a locknut and lifting eye is threaded into flywheel a minimum of 5 turns. An anode helps protect the outboard against galvanic corrosion by sacrificing its metal to be slowly corroded instead of the outboard metals. As the wax heats up the electrothermal ram needle begins to extend, partially closing the fuel enrichment valve, and reducing the flow of fuel from the float chamber into the venturi. Install cylinder head cover and driven sprockets. Clymer Mercury Outboard manuals are written specifically for the do-it-yourself enthusiast.
Remove flywheel cover and spark plug cover. When performing any work where electrical terminals could possibly be grounded or touched by the mechanic, the battery cables should be disconnected at the battery. All information, illustrations and specifications con- tained in this manual are based on the latest product informa tion available at the time of publication. If we can provide additional assistance of any kind please feel free to and tell us what you need. If contaminated oil is noticed, have the engine checked by your dealer. Once again - Thank you for shopping at servicemanualvault. Remove camshaft caps and camshafts.
Install spark plug cover and flywheel cover. You might come from a search engine, then locate this website. After downloading your Mercury Marine Outboard service manual you can view it on your computer or print one or all of the pages needed. Disconnect spark plug leads and fuel hoses. Secure propeller nut to the shaft with cotter pin. Mercury Marine Outboard service manuals are available for immediate download! Mercury Outboard Wiring Diagrams — Mastertech Marin, size: 800 x 600 px, source: mastertechmarine. You may be a specialist who wishes to seek referrals or resolve existing issues.
If we can provide additional assistance of any kind please feel free to and tell us what you need. If you want to know more or withdraw your consent to all or some of the cookies, please refer to the. Any time the intake or exhaust openings are exposed during service they should be covered to protect against accidental entrance of foreign material which could enter the cylinders and cause extensive inter- nal damage when the engine is started. Description Where Used Part No. Oil change 87 50hp 3cyl mariner 1992 outboard manual 99 1993 mercury 50hp fourstroke electro thermal plunger adjustments on 1994 mercury 50hp thunderbolt adjusting idle speed on 1999 df 50hp suzuki outboard carburetors 50hp yamaha 2 stroke carburetors for 1980 50hp mercury outboard carburetor tune up 50hp yamaha outboard carby adjustment for 1995 50hp hero yamaha outboard cooperator for a 2004 50hp yamaha outboard motor correct rpm for 50hp mercury outboard correct prop for 50hp 1996 mercury four stroke diagram for the linkage on a mercury 50hp thunderbolt disassemble.
As the throttle is closed, the throttle lever rotates back and the throttle lever link rod returns, causing the diaphragm in the dashpot to move back, As the diaphragm moves back, suction causes the air from the venturi of carburetor 4 to flow through a one-way valve in the carburetors and back to the dashpot. Turn the flywheel 360° clockwise. It is important to note, during any maintenance proce- dure replacement fasteners must have the same measurements and strength as those removed. Measure and record the intake valve clearance for cylinders 3 and 4. If you click on any of these headings it should open up a new page for that topic. Adjust tab if out of specification.
Your Mercury 2-Stroke Outboard Boat Motor service manual will come to you in pdf format and is compressed for a lightning fast download! This website is not associated with the product manufacturer in any way. Whenever components are removed for service, they should be retained in order. Re-check valve clearance using Valve Clearance Measurement Steps. Mis- matched or incorrect fasteners can result in damage or malfunction, or possibly personal injury. At the end of this website there is additionally a 50 Hp Mercury Outboard Wiring Diagram photo gallery, if the picture above is insufficient for you.
When any product component is serv- iced, care and cleanliness are important. Also, the diaphragm functions as a coasting enrichener during quick deceleration, preventing the engine form stalling. A marine power product is a combination of many machined, honed, polished and lapped surfaces with tolerances that are measured in the ten thousands of an inch. Covers Bigfoot Big Foot and Non-Bigfoot models. Refer to dealer service bulletins for other pertinent in- formation concerning the products described in this manual. Place outboard in a vertical operating position.
Re-install driven sprockets and timing belt. Measure intake and exhaust valve clearance using the Valve Clearance Measurement Steps below. Once again - Thank you for shopping at marineservicemanuals. These points should be lubricated at least once a year by an authorized dealer. The most important tool in your toolbox may be your Clymer manual -- get one today. The shop says the prop shaft is 30 thou out and lets water in the foot milky foot Oil.