Loosen timing belt tensioner and remove tensioner spring. Disconnect safety lanyard switch plate from emergency stop switch. If carbon is present, remove it with a spark plug cleaning machine or by carefully using a pointed tool. Some repair procedures in this 25 hp outboard downloadable manual may require the use of special tools. Remove camshaft caps and camshafts. If water accumulation, sediment, leakage, cracks, or other damage is found, replace fuel filter. Exact Models Covered Covers All 1996-1997 Models World Wide : F8B F8-B , F9.
Install oil pressure gauge in place of pressure switch hole. From basic maintenance and troubleshooting to complete overhauls, our Mariner Outboard manuals provide the information you need. The shim discs are easy to remove and refit. Adjust to within specified range if gap is out of specification. Copyright 2019 Service Manual Vault. Always use a new gasket. Connect negative — terminal second.
Most tools can be rented at local parts stores. Whether performing maintenance or complete engine overhaul to the 150hp engine, this downloadable 150hp repair manual covers it all. Remove timing belt and driven sprockets. Place outboard motor upright on a level surface. Measure tappet clearances by inserting thickness gauge between cam and shim surface.
Measure and record the exhaust valve clearance for cylinders 2 and 4. The outboard marine mechanic should carefully read the text and become familiar with the 90 horsepower marine engine service manual procedures before beginning the work. The tappet clearance specification is the same for both intake and exhaust valves. Refer to the as procedures can differ depending on model and year. Models Covered are Mercury - Mariner 9. Keep this manual handy and use it often.
After a few minutes, the electrothermal ram needle is fully extended, the fuel enrichment valve is fully closed, and enrichment ceases. Re-check valve clearance using Valve Clearance Measurement Steps. Most tools can be rented at local parts stores. Individuals using this 90 horsepower outboard marine repair manual should possess basic knowledge of tools and mechanical theory. After testing, reinstall oil pressure switch. Two tappets can be adjusted at the same time 5. The outboard marine mechanic should carefully read the text and become familiar with the 25 hp marine engine service manual procedures before beginning the work.
Covers Bigfoot Big Foot and Non-Bigfoot models. Mercury-Mariner, Johnson-Evinrude, Yamaha, Honda, Suzuki 100 Common Searches. If no adjustment is necessary skip to step 11 on. Select a proper replacement valve pad by calculating its thickness with the following formula. Even the most novice mechanic can also easily follow the step-by-step guides which are made simple by the illustrations and drawings. Remove driven sprockets and timing belt.
Each 150hp engine repair manual covers every aspect of repair. As the throttle is opened, the throttle lever rotates and pushes the throttle lever link rod. Individuals using this 25 horsepower outboard marine repair manual should possess basic knowledge of tools and mechanical theory. How to install an impeller on a 15 hp 1985 mercury 4 stroke how to install lower unit mariner outboard 15 hp how to manually tilt a 2006 yamaha 4 stroke 15 hp how to rebuild 15 hp even rude powerhead how to remove carburetor from 15 hp 1989 mecury 2 stroke baot motor how to remove shaft seal 15 hp mariner how to remove shifting rod on a 1988 mercury 15 hp four stroke 2007 model how to repair 15 hp johnson model noj15rlere how to replacing timing belt on 1986 johnson outboard 4 stroke 15 hp motor how to troubleshoot trim and tilt electrical system on a 1987 yamaha 15 hp four stroke. Turning air screw clockwise : Engine speed will decrease.
So please make sure your email address is correct. When the tappets are set to the specified clearance, the engine will run without excessive noise from the valve mechanism and will deliver full power. If the reach is too short, carbon will be deposited on the threaded portion of the plug hole resulting in possible engine damage. Confirm the thread size and reach when replacing the plug. After downloading your Mercury Marine Outboard service manual you can view it on your computer or print one or all of the pages needed.