Measure and record in the Measurement Table the thickness of the removed valve pad with a micrometer. Disconnect spark plug leads and fuel hoses. The descriptions are brief but precise and are supported by photographs, notes, drawings and schematics, as well as exploded and sectional drawings. Loosen timing belt tensioner bolt and remove tensioner spring. Where accurate measurements are required, they can only be made using calibrated, precision instruments. To perform all repairs listed in this manual, a complete set of standard tools, as well as the special tools and fixtures shown and listed are necessary. The upper electrothermal valve controls fuel flow for carburetors 1 and 2, and the lower valve controls fuel flow for carburetors 3 and 4.
Remove timing belt and driven sprockets. Remove camshaft caps and camshafts. Mercury-Mariner, Johnson-Evinrude, Yamaha, Honda, Suzuki 100 Common Searches. . Measure and record the intake valve clearance for cylinders 1 and 2. Install tensioner spring and tighten timing belt tensioner bolt. Turn the flywheel 360° clockwise.
After start-up, the current supplied form the electric power source and then flows to the electrothermal valves causing the wax in the valves to heat up. From basic maintenance and troubleshooting to complete overhauls, our Mercury Outboard manuals provide the information you need. Loosen timing belt tensioner screw and remove tensioner spring. Some repair procedures in this 25 horsepower outboard downloadable manual may require the use of special tools. Most tools can be rented at local parts stores.
The in-line, one-way valve prevents the air in the hoses from flowing back to the dashpot. All work should be performed with great care and in a clean working area with adequate lighting. This 25 hp Mariner has very low hours and was very well taken care of. Some repair procedures in this 25 hp outboard downloadable manual may require the use of special tools. These groups contain general information, diagnosis, testing, adjustments, removal, installation, disassembly, and assembly procedures for the systems and components. From 25 hp maintenance procedures to complete 25 hp outboard engine overhaul, these 25 hp manual covers it all.
Information on the construction and function are included. Install cylinder head cover and driven sprockets. This 25 hp Mariner is a 2 stroke, manual start, tiller style outboard boat motor. This manual includes special notes, important points, service data, precautions, etc. Rectify all problems as soon as possible immediately if safety related. Do not allow problems to develop. All information, illustration and specifications contained in this manual are based on the latest product information avaiable at the time of publication approval.
Install timing belt and spark plugs. Mercury-Mariner, Johnson-Evinrude, Yamaha, Honda, Suzuki 100 Common Searches. Follow the procedures in this manual carefully and completely. This manual also contains information about adjusting work and valuable reference data for such adjustment values. Measure and record the exhaust valve clearance for cylinders 2 and 4. After a few minutes, the electrothermal ram needle is fully extended, the fuel enrichment valve is fully closed, and enrichment ceases. Measure and record the exhaust valve clearance for cylinders 1 and 3.
Models Covered are Mercury - Mariner 9. Remove flywheel cover and spark plug cover. Individuals using this 25 hp outboard marine repair manual should possess basic knowledge of tools and mechanical theory. 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. A basic knowledge of mechanics, including the proper use of tools and workshop procedures is necessary in order to carry out maintenance and repair work, satisfactorily.
Keep complete records of all maintenance and repairs with dates and any new parts installed. There's nothing these 25 horsepower repair manuals doesn't cover. Install spark plug cover and flywheel cover. Mercury Outboard Service Manuals Please visit our brand new to see a complete list of all available Mercury outboard service manuals. Following them will help assure reliability. Covers Bigfoot Big Foot and Non-Bigfoot models. If no adjustment is necessary skip to step 11 on.
The most important tool in your toolbox may be your Clymer manual -- get one today. Its recommended to only use the exact tools, as specified in the factory 25 horsepower outboard manual. If we can provide additional assistance of any kind please feel free to and tell us what you need. Before start-up, the electrothermal ram needle is retracted the fuel enrichment valve is opened according to the temperature, allowing a high percentage of fuel to flow form the flat chamber into the venturi during start-up. Providing that the service schedules are respected, the customers can be sure of obtaining the maximum satisfaction and best result from his car.
The throttle lever link rod then pushes the diaphragm in the dashpot, forcing out the air. However, enough information in 25 hp outboard repair manuals is given for do-it-yourself or apprentice mechanics to correctly and safely perform repair work to their 25 hp outboard motor and components. It has been prepared so that if this manual is thoroughly read, even comparatively new personel can give satisfactory after services to the customers as well as disassemble and maintain the vehicle. This manual provides general descriptions for accomplishing service and repair work with tested, efective tehniques. With the outboard in forward gear, adjust idle speed screw to obtain the specified idle speed. Individuals using this 25 horsepower outboard marine repair manual should possess basic knowledge of tools and mechanical theory. If adjustment of intake or exhaust valve clearance is necessary out of specification follow Changing Pad Thickness below.