boat motor oil | Outboard Motor Oil - Part 3

The Anatomy of the Two-Stroke Engine: Part Four

When we left off yesterday, the piston had just bottomed out in the crankcase. Once this occurs, the momentum in the crankshaft will begin to drive the piston back towards the spark plug. As the process continues and more of the gas/air/outboard motor oil mixture is compressed, a vacuum is formed in the crankcase, which in turn opens the reed valve and sucks in more of the mixture from the carburetor.

At the end of the compression stroke, the spark plug fires again and the cycle is repeated. The two-stroke engine derives its name from the fact that only two strokes—the combustion and compression—are required to complete a full cycle. As you’ve probably ascertained, the four-stroke engine has four strokes: intake, compression, combustion and exhaust.

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Is There a Difference Between Two- and Four-Stroke Oil?

Two-stroke engines are more powerful and compact than the four-stroke, which is why they are found on the back of so many boats. But some boats do have four-stroke engines. When you purchase outboard motor oil, you’ll notice that there is both two- and four-stroke oil, but is there really any difference?  As we all know, one of the biggest differences between the two types of motors is how you put oil in the system. In a two-stroke motor the gas and oil are mixed, while in a four-stroke the oil is contained in a separate compartment.

Two-stroke oil costs more, but is it really worth the extra money. The simple answer is yes. And the reason is that two-stroke motors are more susceptible to wear because of the immense amount of power they generate in half the movements. Two-stroke oils have higher ratings to ensure your engine gets the protection it need.

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Preventative Outboard Motor Care: Part Three

Flushing your engine is one of the most basic and essential components of outboard motor maintenance and as such, every boat owner should be well acquainted with the practice. Aside from a basic garden hose and a water source, the only other tool you need is a set of “rabbit ears”—and not the kind you put on your TV. These rabbit ears consist of two rubber hoses and a metal clamp.

Slide the rabbit ears onto the lower unit where the water intake is and hookup the garden hose. Turn on the engine and the water pump will start to do its magic. Once you start everything up, examine the water pump to ensure a good flow of H20. The water coming out of the pump shouldn’t be hot nor have any debris in it. If this is the case, turn off the engine immediately. Tomorrow will go over how to fix the problem, as well as other routine maintenance like how to change your marine engine oil.

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Preventative Outboard Motor Care: Part One

Now that the sun is shining and the days are long, taking time to care for your engine is probably not high on your priority list. And why should it bet; the summer is the time to go out and enjoy your vessel, not spend hours in the garage tuning your engine. However, if you neglect to care for your outboard motor, your time on the water could be fraught with disaster. Personally, I like to do my maintenance in the winter to maximize my boating time when the weather is fair.

From overheating and spent spark plugs to corrosion and rusting, a litany of mechanical problems can plague your motor. Luckily, preventing damage to your outboard motor is relatively simple and won’t take hours on end. You obviously want to change your outboard motor oil regularly, but this is only one of the necessary maintenance procedures. Over the next couple of days, we’ll overview a simple maintenance routine to help keep your engine up and running.

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Environmentally Safe Boating: Part Five

In the previous posts covering eco-friendly boating we have focused exclusively on spilling petroleum products, but this isn’t the only threat your vessel poses to the environment. Emissions are also a serious concern, particularly with two-stroke engines, which emit a much higher level of hydrocarbons. To that end, it’s important to take the proper measures to ensure your watercraft puts off a minimal amount of exhaust.

First, be sure to use the gas to oil ratio outlined in your owner’s manual; an improper mixture can lead to higher emissions and a greater risk of engine damage. Also be sure to only use premium grade gasoline and boat motor oil, such as Evinrude XD 100. Using top-tier oil will help your engine burn cleaner and prevent carbon deposits. In the end, the number one thing to remember when is comes to being environmentally conscious on your boat is simply to use common sense. And if you do have an accident, be sure to contact the Coast Guard and proper authorities immediately.

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Environmentally Safe Boating: Part Four

Fueling your boat is obviously one of the riskiest practices when it comes to petroleum spills in the water. Not only will spilling gasoline harm the wildlife and ecosystem, the corrosive nature of the fuel can cause serious damage to the hull of your boat as well. Although gas stations built on piers are easily accessible for boaters, the ramifications of a spill are exponentially worse than if you were refueling on dry land. So whenever possible, throw your boat on the trailer and make the trip down the street to your standard station.

Whenever you fill your boat, be sure to leave about 10 percent of the tank unfilled to allow for expansion and help prevent spills. There are multiple ways to determine when the tank is almost to capacity, including sounding sticks, listening to the filter pipe and, of course, taking note of the tank’s volume. Another one of the main ways boaters contaminate a body of water is by discharging outboard motor oil through the bilge pump; however, this should be an issue if you keep your engine well maintained. But just to be safe, it’s a good idea to place some oil absorbent materials in the bilge boom and underneath the engine.

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