Outboard Engines Maintenance Troubleshooting and Repair

Outboard Engines Maintenance Troubleshooting and Repair

Ed. Sherman

Preference :

Before you can fix a sick engine, you have to know what makes a healthy engine run. The principle is
pretty simple: A piston fits into each cylinder. When fuel explodes on top of the piston, the piston is forced to move in the only direction it can, down the cylinder. The piston, which is connected by a rod to a crankshaft, turns this downward motion into something more useful by rotating the crankshaft. The crankshaft, in turn, shoves the piston back up the cylinder for more
action. Your Engine’s Four Basic Needs All outboard engines must:
• Admit a mixture of fuel and air.
• Compress that mixture.
• Ignite the compressed mixture.
• Clear away the burned gases.

Remember those four needs: fuel, compression, ignition, and exhaust. They’ll come in handy when
you’re troubleshooting. And they’re valid for all kinds of internal combustion engines, two-strokes, and fourstrokes; gasoline engines and diesels. Two-stroke engines complete the full cycle of fuel
induction, compression, ignition, and exhaust with just two strokes of the piston in the cylinder, one up and one down. In four-stroke engines, the piston must travel up twice and down twice—four strokes in all—to complete the same cycle. The pay-off is that four-strokes are more efficient than two-strokes. Later, we’ll discuss in more depth the relative advantages of twostroke and four-stroke engines. Right now, what you need to know is that two-strokes are more powerful for their weight, so you get a lot of horsepower from a light engine. They’re also mechanically simpler.
But they are gas guzzlers and don’t particularly like slow running. Their greatest sin is that they burn their lubricating oil along with the gasoline. This causes so much exhaust pollution that the U.S. Environmental Protection Agency (EPA) is forcing two-stroke outboard-engine manufacturers to reduce hydrocarbon emissions by 75 percent within the next 10 years. (You’ll find more information about that in Chapter 11.)
Four-stroke engines are heavier, and usually costlier because they need fuel-intake valves and exhaust valves. But they’re more economical to run than two-strokes—they get far better mileage. Significantly, they’re also much kinder to the environment. They don’t burn their lubricating oil, so they pollute much less.

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Content :
  • The Basics: What Makes Your Engine Tick
  • Breaking In a New Engine
  • Routine Maintenance
  • How to Find the Trouble
  • Isolating Ignition System Problems
  • The Charging and Starting Systems
  • The Fuel and Lubrication Systems
  • Servicing the Steering and Trim Systems
  • The Cooling System, Lower Unit, and Propeller
  • Dealing with Corrosion
  • Brand-Specific Information


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