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Fuel Hose USCG Type A

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Quicksilver High Performance Gear Lube

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MPI Marine Products 350-1120 Fuel Fill Hose 1 1/2"

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Teleflex CC179 Control Cable Assembly 600A Series

Teleflex CC179 Control Cable Assembly - Mercury 600A Series OEM Direct-Replacement Cable The Teleflex CC179 control cable assembly is an OEM direct-replacement type cable designed to fit Mercury engine control heads which use a proprietary control...

TFXtreme 3300/33C Type Universal Control Cable

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Quicksilver Conventional 25w-40 Engine Oil

Quicksilver Conventional 25w-40 Marine Inboard & Sterndrive Engine Oil This superior 24w-40 marine engine oil has been specifically formulated and developed to meet the needs of high-output sterndrive and inboard engines...

Sierra 18-7945 Fuel Water Separator Filter

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Teleflex CC205 Control Cable Assembly 479 Series

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Mercury-Mercruiser 35-866340K01 Oil Filter

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Mercury - Mercruiser 19-8M0214985 PVS Vent Plug

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Johnson Evinrude XD50 2-Cycle Syn Blend Oil

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TFXtreme Control Cable for Johnson, Evinrude, OMC 1979 & Newer

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Quicksilver 35-866340Q03 Mercruiser Oil Filter

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Did you know? There are two types of boat parts to choose from: Original Equipment Manufacturer (OEM) or aftermarket. If you boat is new, or has seen only a couple seasons of use, your OEM will be the preferred way to go. For your convenience, Wholesale Marine keeps a huge inventory of these replacement marine engine parts on hand. Yet OEM parts may be too expensive for some of us. And for older, well-preserved boats, OEM parts may no longer be available. Should you opt for aftermarket, no worries, Wholesale Marine has your back. We stand by the products that we sell since many of today’s aftermarket parts undergo the same quality testing as OEM parts. The only difference is price as aftermarket parts cost far less than their OEM cousins.

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12 Parts of a Marine Engine Explained With Pictures

Introduction

The modern-day marine diesel engine is nothing short of a marvel. It propels humongous ships through rough seas without missing a beat.

This robust machinery is so critical that 80 percent of the world’s trade by volume would come to a standstill without it [1] .

In this article, we intend to break down the parts of a marine engine to better understand each part’s working and purpose and how they fit into the big picture.

The marine engine is available as a two stroke engine and four stroke engine. About 75 percent of all marine engines are four stroke engines but 75 percent of the total power share is produced by the two stroke engines [2] .

We shall cover the marine two stroke engine in this article. Let’s start from the beginning.

What is a marine diesel engine?

The marine diesel engine provides the propulsion energy for a vessel to move. It is a reciprocating engine that can run in ahead and astern directions at variable speeds.

It is similar to self-ignition engines in heavy-duty vehicles but with more complexity and power-generation potential.

All the components increase in size. The largest two-stroke marine engine can produce up to 80,080 KW of power and weigh up to 2,300 tons [3] . That is enough power to run 110,000 Toyota Corollas at their maximum rpm.

The marine diesel engine not only generates this power but transmits it at higher mechanical efficiencies than other engines.

For power generation, it uses an internal combustion engine that generates power from either heavy fuel oil or diesel.

A fuel-air mixture undergoes controlled combustion in the combustion chamber and pushes the piston.

The piston powers the crosshead which in turn transmits the power to the crankshaft through a connecting rod.

The connecting rod converts the linear motion into rotational motion at the crankshaft. The crankshaft connects to the propeller and moves the vessel.

If you want to learn more about the types of marine engines, click the following link: Types of Marine Diesel Engines.

Parts of a marine engine

There are several thousand parts in a marine engine that are essential for it to run.

In this section, we shall divide the engine into its major parts and try to explain their purpose and working. We shall be covering the following parts:

• Entablature or Cylinder block

Connecting rod

Cylinder liner, cylinder head or cylinder cover, exhaust valve, turbocharger.

The bedplate is the bottom-most part of the engine that supports the engine weight. It is, therefore, the most-loaded part of the engine.

It is mounted on chocks and secured to the floor using holding down bolts for stability.

The bedplate must be strong enough to withstand the weight of the engine and flexible enough to bend when the hull bends during the hogging and sagging of the vessel.

Usually made of cast steel, a bedplate is manufactured by joining two longitudinal girders through multiple transverse girders.

On these transverse girders are semicircular cavities to support the crankshaft.

Bedplate function:

• Support the engine weight
• Support the dynamic load of the running parts
• Collect lube oil and drain it to the sump
• Hold the crankshaft in alignment at all times

Related read: MAN B&W Engine Nomenclature Explained

As the name suggests, the A frame looks like the letter ‘A’. On the bottom, it rests on the bedplate and on the top, it supports the cylinder block (or entablature).

An A frame is erected over each transverse girder of the bedplate. A jointing compound is added between the A frame and the bedplate to improve sealing.

The A frame secures itself to the engine through fitted bolts and tie bolts. Fitted bolts connect the bedplate and the A frame whereas the tiebolt secures the entablature, A frame and the bedplate with the vessel.

The A frame and the bedplate cavity (between transverse girders) form an enclosed space and isolate each unit of the engine. This enclosed space forms the crankcase for the engine.

The entire A frame is cast as a single unit in the case of smaller engines. For larger engines, the complete A frame is cast as 2 or 3 separate units and then bolted together.

On the inside, the A frame houses the crosshead and the crosshead guide. The guides are machined in place in newer engines and cannot be adjusted.

A frame function:

• Hold the crankshaft in alignment
• House the crosshead and its guide
• Support the cylinder block or entablature
• Form the crankcase space

Entablature or cylinder block

The entablature rests on top of the A frame and houses various parts of the engine such as the scavenge space, stuffingboxes, jacket cooling water spaces and the cylindrical cavity for the cylinder liner.

In older engines, the jacket cooling water space would be inside the entablature, but in newer engines the space is between the jacket and the liner and the jacket fits into the entablature.

The entablature’s structure is made strong enough to resist the combustion forces. Cast iron works best for the entablature.

Even here, fitted bolts are used to connect it to the engine.

It is worth noting that the fitted bolts are used only for the purposes of alignment and location of the various parts.

They are not equipped to handle the engine’s firing forces that try to separate the three parts (Bedplate, A frame and entablature). That is a job for tie bolts.

Entablature or Cylinder block function:

• House the scavenge spaces and the liner cavity.
• Support the liner, the cooling water jacket, the cylinder head, the inlet and exhaust valve and other connected components

The crankshaft is one of the most critical components in the engine. This part along with the connecting rod is responsible for converting the reciprocating motion of the engine pistons into the rotational motion of the propeller.

The propeller converts this torque into axial thrust and moves the vessel.

The crankshaft is subjected to a range of varying loads from the piston, combustion, propeller and the flywheel. It must therefore be designed keeping these cyclic loads in mind.

The crankshaft consist of the journal, crank webs and crank pin. It is generally made out of alloyed steel but the specific constituents used in the shaft vary on a case-to-case basis.

Elements such as silicon, nickel, vanadium, and chromium provide the characteristics for the crankshaft. To learn more about crankshafts, go to the following link: Types of Crankshaft .

Crankshaft function:

• Collect power from power generating units such as firing cylinders and transmit it to consumption units such the propeller, shaft generator, flywheel and the units in suction stroke
• Convert linear motion to rotational motion
• Distribute the axial and rotational forces generated during ship’s movement to the ship’s hull through axial and rotational bearings

The connecting rod (or con rod) connects to the crankshaft on one end and the crosshead on the other.

As the piston moves up and down, it moves the crosshead with it, which in turn, imparts the same motion to the connecting rod.

Using this motion, the connecting rod moves the crank pin (and therefore the crankshaft) in a circular motion.

The rod undergoes tensile, compressive, bending and buckling forces during the operation.

The piston side is known as the small end and the crank pin side is known as the big end. The connecting rod has bearings on both ends for a smooth and damage-free operation.

The connecting rod, just like the crankshaft, is under constant cyclic loading. This makes it vulnerable to fatigue failure and the connecting rod design accounts for it to ensure durability.

Connecting rod function:

• Convert reciprocating motion of crosshead into rotational motion of the crankshaft
• Supply oil from the crosshead to the crankpin through bores for cooling and lubrication

Related read: Engine Connecting Rod | Types, Parts, Materials and Stresses Explained

The crosshead is a rectangular part that acts as the link between the piston and the connecting rod.

It has a circular pin at the center known as the crosshead journal or the crosshead pin. The eye of the connecting rod’s small end fits onto this pin.

The crosshead bearing cap has a provision through which the piston rod connects to the crosshead journal through studs and bolts.

The lubrication oil for the crosshead pin bearing is supplied through a telescopic pipe. Through drilled bores, the oil travels further to the piston as well as the crank pin for lubrication.

On either side, the crosshead has guide shoes. The sliding faces of the shoes are lined with white metaland they traverse on rails known as the crosshead guides.

Crosshead function:

• Eliminate the side load on the piston and the cylinder liner by transmitting it to the engine structure instead of the piston
• Supply lubricating oil to the crank pin bearing and the piston
• Allow the free movement of connecting rod outside of the cylinder

The piston is a composite part that converts the gas forces into mechanical forces for the engine.

It fits into the engine cylinder and transmits the mechanical force to the piston rod (in the case of two stroke engines) or the connecting rod (in the case of four stroke engines).

The two separate piston parts are the piston crown and the piston skirt. They are connected by 16 or more bolts on the underside of the skirt and then locked with locking wire.

The piston rod is secured to the inside of the crown through another set of bolts.

The piston is subjected to high amounts of thermal and shock loading. They are usually heat treated

Piston function:

• Deliver the power from the cylinder to the crankshaft through the crosshead and the connecting rod arrangement
• Compress the air fuel mixture during the suction stroke
• Seal the combustion chamber and prevent the blowby of hot gases

The cylinder liner fits inside the engine cylinder and acts as the combustion chamber for the engine.

It is directly exposed to the compressed air-fuel mixture during the suction stroke and the combustion pressure during the power stroke.

The cylinder liner is a wearable part and a wear of 0.1 mm over 1000 hours is normal. If the wear exceeds this rate, further investigation is necessary to determine the cause and address it.

Typically, a cylinder liner is replaced when the cylinder wear reaches 0.6-0.8% of the bore volume or as per the engine manufacturer’s guidelines.

Cylinder liner function:

• Carry out heat dissipation for the combustion process
• Form a sliding surface and facilitate the smooth movement of the piston
• Ensure that the combustion chamber is air tight. The sealing capability reduces overtime as erosion occurs and the gap between the piston rings and the liner increases.

The cylinder head is the topmost part of the engine structure and houses various monitoring instruments and mountings such as the fuel valve (or fuel injector), starting air valve, cylinder relief valve, indicator valve, exhaust valve, etc.

It also has cavities for cooling water circulation.

The cylinder head completes the sealing arrangement of the combustion chamber from the top.

The space between the cylinder head and the cylinder liner is sealed using a mild steel ring also known as the sealing ring.

The cylinder head is also a part of the jacket cooling water system. It is provided with passages that receive water from the cylinder liner outlet.

After cooling the cylinder head, the jacket water travels into the exhaust valve cooling spaces.

Cylinder head function:

• Seal the combustion chamber
• Transfer combustion forces to engine structure
• Act as a platform to deploy starting air and fuel into the system
• Provide the passage of cooling water from the liner to the exhaust valve.

Each engine unit has its own exhaust valve that is mounted onto the central bore of its cylinder head.

Once the combustion is complete, the exhaust valve opens and extracts the exhaust gases from the combustion chamber.

From the exhaust valves, the gases are first transferred to the manifold, then to heat recovery systems (turbocharger, economiser) and finally let out through the ship’s funnel.

A hydraulic oil pump controls the valve timing. The exhaust cam on the camshaft operates the hydraulic oil pump and opens the exhaust valve.

The hydraulic pressure can go up to 220 bars for opening the valve.

Once the hydraulic pump’s roller comes off the cam profile, it relieves the pressure in the hydraulic line.

The spring air pushes the spring air piston upwards and closes the valve. The spring air pressure is about 7 bars.

The exhaust gases are typically in the range of 350 to 400 degree Celsius and hence, cooling is provided through jacket water for heat dissipation.

Exhaust valve function:

• Extract the exhaust gases at the correct time for the set duration
• Maintain efficient sealing when closed to prevent compression air and exhaust gas leakage
• Transfer the gases to the manifold for further use

The main engine camshaft is a rotating part with several fixed cams at varying angles. The camshaft derives power through the engine crankshaft through chains or gears. When it rotates, it rotates the cams with it.

The camshaft speed is the same as the crankshaft speed in a two-stroke engine and half of the crankshaft speed in a four-stroke engine.

The number of camshafts in an engine depends on the type of engine. Inline engines have one camshaft, V-shaped engines have two.

The rollers on these cams have a single degree of freedom and can only go up or down. By virtue of this motion, the rollers operate various machinery.

Camshaft function:

• Convert the rotational motion of crankshaft to the reciprocating motion of cam rollers
• Operate inlet and exhaust valves in the case of four stroke engines and only exhaust valve in the case of two stroke engines
• Operate fuel injection pumps and the starting air distributor. However, common rail injection systems for fuel deployment are becoming common on modern vessels

The main engine turbocharger is a forced induction device that consists of a turbine and a compressor/blower.

The two are arranged in a manner that enables the supply of pressurized fresh air to the combustion chamber.

The intention is to provide a greater amount of oxygen through air to increase the power output of the engine.

Large marine engines typically have two turbochargers. The exhaust gases from each unit are collected in the exhaust manifold and supplied to the turbocharger turbine.

The moving particles in the exhaust gas move the turbine blade. The shaft of the turbine through appropriate sealing arrangements is connected to the impeller of a special compressor.

The compressor draws in atmospheric air and compresses it. This compression is responsible for the increase in power output .

As the mass of intake air increases, we can proportionately increase the fuel quantity and generate greater power compared to a similar-sized naturally aspirated engine.

The process increases the temperature of the air to above 120 degrees C.

A charge air cooler reduces the temperature of the air to recommended levels and sends it to the scavenge manifold.

Turbocharger function:

• Increase the fresh air mass for combustion
• Utilize residual energy of exhaust gases for an improved engine efficiency

While this is not an exhaustive list, we have tried to cover all the major parts of the marine diesel engine.

All the parts in the engine must work in sync with each other for the engine to have stable parameters even when under varying loads.

An effective preventive maintenance system for all the engine parts is the key to the long and efficient operation of a marine engine.

Related read: Crankcase Explosion – Explanation and Prevention

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WELCOME TO YACHT PARTS CENTER

Discover Yacht Parts Center, the leading mega yacht supplier in the French Riviera, boasting the most extensive and exclusive selection of in-stock marine engine parts in the Mediterranean. Shop now and elevate your yachting experience!

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Watercraft Engine Parts

Discover high-quality engine parts for watercraft, ensuring top performance and reliability

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Discover high-quality marine filters to keep your vessel's systems running smoothly.

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Welcome to Yacht Parts Center ,

Your dedicated partner in yachting excellence. With extensive industry experience, we proudly offer a diverse range of top-quality marine parts and accessories to satisfy the needs of yacht enthusiasts worldwide.

Based in the heart of the French Riviera , we're strategically located to cater to discerning yacht owners in Cannes, Nice, Monaco, and beyond. Our commitment to customer satisfaction shines through our expert team , ensuring a seamless and enjoyable yachting experience.

Experience fast delivery options, unwavering engineering support, and unparalleled customer service. Join our growing community of delighted customers, and trust Yacht Parts Center for all your marine equipment needs.

French Riviera Free Delivery: Orders Over €500 Ship Free!

Complimentary Shipping in French Riviera on €500+ Orders - The best as fastest rates available !

Extra fast delivery 2 hr*

Experience lightning-fast 2-hour delivery in the French Riviera ( Cannes, Nice, and Monaco) ! Shop now and get your items in a flash !

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Expert engineers on standby 24/7 for all your needs !

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Hot days, cool nights.

Extend your summer with up to 70% off

FINDER TOOLS

We offer over 95,000 boat covers for 600 marine manufacturers with the industry-best warranties - Up to 10 years! Our Boat Cover Finder is easy to use and makes finding the right fit fast and painless. Free ground shipping is offered for all covers and tops.

BIMINI TOPS

Aftermarket boat bimini tops have three industry-leading manufacturers: Carver, Westland, and Taylor Made. iboats.com offers all three! Industry-best warranties offered with boat covers are also offered with tops. Our bimini top finder makes it easy to find what you’re looking for with quality frames, fabric, and all the necessary mounting hardware needed.

iboats.com has the largest selection of Boat Props anywhere and offers a very user friendly finder. You will find discounts on major propeller brands including Solas, Michigan Wheel, Turning Point, and Quicksilver.

Engine Parts

With boat motor parts for Mercury/Mariner, Honda Marine, Yamaha, Suzuki, Evinrude/Johnson, and others, our selection covers everything from internal engine parts to the repair manuals you need to fix them. With our boat engine parts finder, you’ll have your motor humming like new again in no time.

High quality propellers and affordable prices

"World's best fitting covers"

Liquidation covers as low as $199 while supplies last.

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SHOP 1000'S+ OF USED AND NEW BOATS

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Sell Your Boat and Buy A Boat! Browse our nationwide listings of New and Used boats for sale or research new boat brands and models.

POPULAR PRODUCTS

Honda 5hp Outboard

Slide Anchor Box Anchors - Select Size

Was $159.99

Slimline Shore Dock Power Pedestal - International Dock Products

Springfield Air-Powered 3-Stage Pedestal - Anodized

Spectrum Color Boston Whaler, 1972-1993, Desert Tan Color Boat Gel Coat Patch Paste Repair Kit

THIS IS IBOATS

What makes iboats.com your trusted source for everything boating.

Millions of boating supplies sold since 1998, largest selection of boating gear on the internet, and largest boating social network.

Boats, more fun for you and your family

At iboats.com we help you to have more fun on the water. For over 22 years we have served both recreational boaters and marine businesses. We offer the lowest prices on over 150,000 OEM and aftermarket boat parts and accessories with the largest selection of quality items found anywhere. We also continually offer discounts and blow-out specials. Be sure to check out our daily, weekly, and monthly deals such as our MONTHLY IBOATS MOST WANTED LIST, so you can take advantage of these major discounts on top-quality items.

New and used boats

Want to buy or sell a boat? We make it easy to find and buy the boat you really want. We have some of the most extensive used boat listings available. You can easily buy or sell your boat right here. We also make it easy to research and compare new boats from all the major manufacturers. At iboats you can find the perfect boat for you. We offer tools to help you connect with boat loan providers and boat insurance networks. Start your search right here today.

Our boating community is #1 in the world

We have the largest community of boating enthusiasts online with hundreds of thousands of members willing to share boating information and help one another. Come join us! It's free and fun.

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• 17506 Marine Power Industrial Park Ponchatoula, LA 70454
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