Marine-Engine and Electrical Systemscheck out the Marine Electrical School swicki at eurekster.com
Module 103 – Marine-Engine Systems, Electrical and Control Systems
At the completion of this subject module you will understand basic diesel systems, Electronic engine control systems, engine starting systems, engine instrumentation, pre-heating systems, basic ignition systems, outboard engines and charging systems and how to perform basic maintenance and troubleshooting on all of the marine diesel engine systems
The diesel engine is the main propulsion source for most motorboats and power vessels, and an auxiliary one for sailing boats, and therefore the basics will be covered so that the relationship and context between the various electrical systems is understood.
The diesel was invented in the late 19th century, and named after the pioneer engineer Rudolph Diesel. The diesel engine works on the principle of compression-ignition, where air is compressed to a point where fuel combustion will occur spontaneously.
This manual deals with 4 stroke compression-ignition engines. The 4-stroke cycle comprises the air intake, compression, power and exhaust. While there is much talk about bio-diesel in these times of high oil prices, in fact the diesel was originally invented to run on peanut oil.
The Marine-Engine Starting System
The marine-engine requires a number of other systems to support it. The principle system to turn over the engine and start combustion is the starter motor and related control systems. Marine Diesel Engine Starting Systems Part 1 All about electric starting systems for marine diesel engines. Marine Diesel Engine Starting Systems Part 2 All about electric starting systems for marine diesel engines. To monitor the basic parameters such as oil pressure, water temperature and speed various sensors and related instrumentation is used.
The Air Intake (Suction) Stroke
At (Top Dead Center) TDC the air inlet valves open, the exhaust valves are closed and the air required for fuel combustion is drawn in (via turbocharger and air filter) as the piston moves downwards. This creates a partial vacuum to "suck" the air in to the cylinder. At the bottom of the stroke, Bottom Dead Center (BDC) the inlet valves close.
The Compression Stroke
In the compression stroke the piston moves upwards to compress the air, and raises the temperature within the engine cylinder, typically to around 550 Deg C. At just before TDC fuel injection takes place and after an interval ceases.
The Power Stroke
When the fuel is injected it ignites spontaneously, and once ignited, increased pressure is then generated in the cylinder, driving the piston down to BDC.
The Exhaust Stroke
At BDC the exhaust valves open to expel exhaust gases, and at the end of the stroke the valves close at TDC. The process of expelling exhaust gases and replacing them with new fresh air is called scavenging.
Each cylinder typically has 2 or 4 valves, one or two for inlet and the same for exhaust. The valves are actuated by rocker arms. These are controlled by pushrods that are controlled by the camshaft lobes. The camshaft is gear driven from the main crankshaft. This arrangement ensures the correct timing in each stage of the 4 stroke cycle. These parts are lubricated by the lube oil system
The Marine-Engine Combustion Air System
The air for fuel combustion is drawn in through an air filter and compressed. The amount of fuel that can be burnt, and therefore the amount of power of the engine are limited by the air mass within the cylinder. The options are to pre-cool the air to increase the air density, or to use turbo-charging. This raises the air density by increasing the pressure at which the cylinder is filled with air during the air intake stroke, and increases the engine power for the same cylinder size.
The turbocharger is essentially a small air compressor, which is driven by a turbine placed in the exhaust line. As the marine-engine load increases, the exhaust gas output velocity also increases, which increases the turbine speed to drive the air compressor faster, which increases the air pressure into the cylinders. As the air is compressed into the engine cylinders, the air temperature also increases which reduces available oxygen, so some engines may have intercoolers installed. These cool the compressed air, which improves combustion
All you need to know about the marine-engine and alternator-generator-starter systems on boats
Diesel Performance Parts - Performance Ford Truck Parts for Mustangs, Cobras, Lightnings, Powerstroke Diesel, Duramax Diesel and Cummins Diesel. Shipped direct to you, avoiding high overhead and passing savings to you
California Steelhead Fishing - Every winter thousands of ocean going Rainbow Trout leave the Pacific ocean and return to California rivers and creeks where they were born, making California the ideal winter steelhead destination
Alaska Fishing Charters - Salmon - Halibut - Alaska Fishing Charters for Salmon and Halibut in Southeast Alaska. Ketchikan Alaska known as the "Salmon Capitol of the World". At the edge of Alaska fishing waters, it has all five types of salmon
Gold Beach Oregon RV Parks - Turtle Rock Resort, Southern Oregon Coast RV Park at Gold Beach Oregon - on the Ocean Front near the Rogue River. Gold Beach RV Park, Gold Beach Vacation Rentals, Cabins and Cottages at Hunters Creek
Skagway Sportfishing Charter - Skagway Alaska fishing charters for trophy salmon. Master Guide Greg Jones gives all out effort. Experience heart-pounding sportfishing action.
Rogue River Salmon Fishing - Rogue River Salmon and Steelhead Fishing. Southern Oregon Steelhead Fishing on the Rogue, Chetco, Elk and Sixes River, drift boat and powerboat trips Owner Name Denny Hughson
Oregon Vacations - Coast Vacations - The best available Southern Oregon tourism information for planning your vacation. Visit and enjoy all the activities, services and natural wonders offered in our outdoor recreation paradise.
Custom Welded Aluminum Jet Boats - Rogue Jet Boatworks superior products, a passion infusing superior craftmanship to name a few: full length box girders, surfboard keel-plates, laminar flow intakes, reinforce gunnels and a Lifetime Hull Guarantee
Alaska Halibut Fishing - Exhilarating Alaska fishing charters for trophy salmon, halibut and giant lingcod. Master Guide Steve Zernia gives all out effort. Experience heart-pounding sportfishing action
Defense Today - Where the World Finds Its Information on military weapons technology. News on the latest cutting edge systems
Seward Alaska - The Hotel Edgewater can accommodate every travel budget. Featuring comfortable ocean front rooms, conference center, espresso bar, and Alaska's only 3-story atrium, water fall
Kodiak Alaska Luxury Fishing Lodge - Spectacular luxurious wilderness fishing resort and lodge offering unique wilderness adventures in the heart of the Alaskan wilderness on the quiet shore of Larsen Bay on Kodiak Island Alaska
Maui Vacations - Complimentary Concierge Services, discount rates for activities on Maui, Hawaii, Kauai, Molokai, Lanai and Oahu. Helicopter Tours, Ocean Activities, Land Tours, Whale watching, Snorkeling, Luaus, more
Portable Generators - Where America shops for portable electric generators and pressure washers. Get the best brands at the best prices. Diesel or gasoline generators and engines, parts and accessories.
Database Software - Fast powerful answer for all kinds of data challenges. Aggressively and conveniently priced monthly subscriptions. Put the power of 20+ years experience directly into your hands
Seward Alaska - Experience the beauty of Kenai Fjords National Park and Resurrection Bay while cruising in comfort aboard our custom-built catamaran in Seward, Alaska.
Tacoma Electrical Contractor - Americo Electric is a small family owned company in Pierce County that provides a full range of residential and small commerical and industrial electrical services
Alaska Fishing Lodge - Expect a fishing vacation where we will not have you settle for anything less! Superior customer service, a warm and inviting atmosphere. The ultimate Alaska experience at an all-inclusive lodge
Pheasant Hunting - Midwest premier hunt club and kennel in the scenic Loess Hills with close to 10,000 acres of prime hunting ground, the natural habitat provides unlimited challenges for groups of all sizes.All about the marine-engine and more