Insert the proper valve pad into the valve lifter. The sections included in each volume are indicated by black type in the Section Index. 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. 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. Whether performing maintenance or complete engine overhaul to the 75hp engine, this downloadable 75hp repair manual covers it all.
Download a 75 hp manual straight your computer in seconds and fix your problems now. If such details as replacing spark plugs, the ignition and electrical systems, the oil injection system, the lower gear case and jet drive units, engine synchronization and linkage adjustments and a number of other mechanical intricacies used to be foreign to you, now you can understand how they work and what to do when they don't work. Turn the flywheel 360° clockwise. Keep individual cylinder parts together. Measure intake and exhaust valve clearance using the Valve Clearance Measurement Steps below. Keep Your Outboard Running Smoothly. Loosen timing belt tensioner and remove tensioner spring.
. This may also lead to preignition and detonation. Keep this manual handy and use it often. Loosen timing belt tensioner screw and remove tensioner spring. Always use the recommended spark plugs.
The throttle lever link rod then pushes the diaphragm in the dashpot, forcing out the air. The switch should indicate no continuity any time the shift linage is in gear. If your boat is equipped with an aftermarket control box, consult with the control box manufacturer for service procedures. Measure and record the intake valve clearance for cylinders 1 and 2. So please make sure your email address is correct. This additional air flows into the carburetors and mixes with the fuel from the main jets.
Instant download 1990-2000 Mercury Mariner Outboard Motors 2. Disconnect spark plug leads and fuel hoses. Remove timing belt and driven sprockets. 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. Align timing marks on driven cams.
Two electrothermal valves are installed on the carburetor assembly. Remove flywheel cover and spark plug cover. The gasket on the plug must be fully compressed against a clean plug seat for heat transfer to take place effectively. Your will receive a download link immediately after your payment is completed. Most repairs and maintenance tasks can be completed at home when you have this trusty guide in hand. Also, the diaphragm functions as a coasting enrichener during quick deceleration, preventing the engine form stalling. Make sure the spark plugs are correctly torqued.
If heat transfer cannot take place, the spark plug will overheat and fail. Install driven sprockets and timing belt. The information on this manual covered everything you need to know when you want to repair or service Mercury Mariner 75hp-275hp Outboards. Remove driven sprockets and timing belt. Covers complete tear down and rebuild, pictures and part diagrams, torque specs, maintenance, troubleshooting, etc.
Measure and record in the Measurement Table the thickness of the removed valve pad with a micrometer. This Factory Service Repair Manual offers all the service and repair information about Mercury Mariner 75hp-275hp Outboards. If the engine does not require inductor or suppression spark plugs, yet ignition interference with onboard accessories is noted, install the recommended inductor or suppression spark plug as recommended in Table 2. Install cylinder head cover and driven sprockets. D000750 , 50 and 60 hp serial No.
With the outboard in forward gear, adjust idle speed screw to obtain the specified idle speed. Adjust tab if out of specification. Measure and record the exhaust valve clearance for cylinders 1 and 3. Description This printed and bound paper 1990 1991 1992 1993 Mercury 3-275hp Outboard Boat Engine Repair Manual provides detailed service information, step-by-step repair instruction and maintenance specifications for 1990-1993 Mercury 3-275hp outboard boat engines including 3 hp, 3. Instant download of a repair manual for 1990-2000 Mercury Mariner 2-stroke outboard motors, rated from 2. All information, illustrations and product descriptions contained in this manual are current as at the time of publication. Remove timing belt and driven sprockets.