Marine Diesel Two Stroke Engine - How it Works!

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Learn about large two stroke marine diesel engines! These types of engine power some of the world’s largest ships. This 3D animation video gives you a unique look at just how these huge machines work. Ideal for anyone interested in marine engineering!

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▶️ Introduction

This video explains how large marine two stroke diesel engines work. We look at all of the main parts associated with the engine, how it works, and some of its typical characteristics e.g. fuel consumption, number of cylinders, weight of engine, weight of piston, rpm etc.

Enjoy!

#saVRee_Nuggets, #saVRee

[savree-d]

Want to continue learning about engineering with videos like this one? Then visit:

Want to teach/instruct with the 3D models shown in this video? Then visit:



IMPORTANT
The exhaust gas valve for this engine is hydraulic open and pneumatic close (air cushion). The video states hydraulic and hydraulic, but this is incorrect. We have updated the video to fix this error on saVRee.com, but YouTube does not allow us to update the video here. Apologies for the confusion.

[pkkingz]

I understand, yet refuse to accept that the scale of this is so large that there’s ladders in the crank case... amazing

[stanb]

This video deserves an award for both its animation and its clarity. Well done!

[StewartMarkley]

As a submarine sailor from the 70s, I spent a lot of time in the engine room of the submarine around the nuclear reactor, steam generator, condenser, turbines, and bull reduction gear and fascinated by the sheer size of the components to power the submarine through the water. Our diesel engine was strictly for backup propulsion and was TINY compared to this monster. The 115, 000 bhp of this beast makes the 20, 000 bhp or so power from the turbines and reactor seem rather quaint by comparison. I never thought of using the term engine room to describe an engine with enough internal room so big that you could literally walk around INSIDE. Thanks for a great job on this video. Well done.

[scottsmith]

I was an automotive technician for 22 years but these giant engines impress me to no end. I had no idea how you open and close the valves, and the exhaust valve spinners and pressure relief valves are really cool solutions!
Thanks for the great video!

[chrish]

Detroit Diesel, which powered many heavy duty trucks and marine use diesel were 2 stroke diesels for decades. They were very effective at turning diesel fuel into heat, noise, and vibration.

[ibrahimazaldeen]

So professionally explaind !! It is not boring at all eventhough it was 30 min video. I enjoyed every second thank you and keep it up

[blueherc]

I lived through a crankcase explosion! The year was 1972. The general cargo ship loaded building materials at Oxelosund (Sweden) for Bangladesh. The Suez canal was closed so we headed south by the west coast of Africa. Somewhere north of Capetown and with no dry land in sight, the #5 cylinder got hot and one of the bearings ignited the oil droplets in the crankcase. The engine was a Gotaverken G-6 six cylinder. We were adrift for a week! The company that owned the ship, a Greek company, said they didn't want to pay for an open sea tug and that we first must try to resolve the problem ourselves. We worked day and night to replace the piston and we were able to restart the engine and we reached Capetown where proper repairs took place.

Note: The exhaust valves were not hydraulic but conventional with push rods, rocker arms and springs and manually lubricated by the Oilers. It was my last ship and end of career.
This video is very nice, clear and easily understandable by people not familiar with big marine engines. Thanks much.

[andriesterpstra]

Actually, the real function of the crosshead is to absorb a horizontal force component. The pushing force in the connecting-rod (when at an angle) consists of a horizontal and a vertical component. In small engines (no crosshead), the horizontal force is absorbed by the cylinderwall, while the piston is sliding along.. For these engines this force is too large to be absorbed by the cylinder, thus the crosshead is transferring the horizontal force to the crosshead guides. BTW, I'm a former ships engineer.

[viejoverdez]

as marine engineer with more than 10 years sailing i found your video very instructive and interest

[CptGiorgis]

As a cadet I came to this channel last year trying to comprehend how the machinery onboard works based on what you explained. And now a full video on a marine engine, with more marine videos to come? Best news ever!

[BandaSemStudio]

I'm a Marine Engineer and I loved that video. Amazing animation and explanation. You nailed it!

[brianteal]

In my younger days, our family owned a marina on Lake Erie just south of Detroit. During high school and college, I was a marine engine mechanic. I learned about outboard and inboard engines from my dad and older brothers. I would watch the freighters go up and down the Detroit river wondering how those massive engines worked. You did a great job answering many questions I have had for years. You include just the proper terminology to make us novice mechanics understand. The interactive graphics are just great. Keep up the good work. I will keep watching!

[deusexaethera]

6:43 - Two-stroke diesel engines aren't turbocharged to increase efficiency, they're turbocharged by necessity. The turbocharger provides the pressure required to refill the combustion chambers with fresh air after each combustion cycle. Remember, a two-stroke diesel engine doesn't have an intake stroke to pull in fresh air, and it doesn't compress the intake air inside the crankcase like a weedwhacker engine does.

[danielgore]

Being a diesel mechanic on heavy equipment, I never had the chance to study large shipboard engines. I've known most were two stroke, but never truly how they operate. Thank you for this informative video. I'll never look at a Detroit diesel on a shrimp boat the same! Thank you.

[rajeensuriyawansa]

This guy is not only a professional in marine engineering, also a professional in teaching and demonstration of engineering.
THE BEST DEMO VIDEO I EVER i went through. So simple to undertand and very clear and finest animations used.
WELDONE SIR.KEEP GOING
greetings from SriLanka
ආයුබෝවන් !! ඔබට දෙවිපිහිටයි !!!

[TantawanFPSO]

Has to be one of the best videos out there for Young Marine Engineers, It must have taken you forever to master the 3D software to get it so good. Well done.

[nicholasbrown]

Just wanted to save thank you for taking the time to make videos like these with such great depth and display - also liked that you get side tracked into providing details of the details it really adds a nice touch to the teaching of it all haha Have liked and subscribed will be sure to watch through each and every video on the channel on the run up to my written and oral exams later this year! Keep up the great work

[mopesca]

I worked for MAN B&W several years ago, and this video brings some good old memories to mind. One situation
i will always remember is how I had to change the piston oilers, down in the sleeve, 1 of 3 was only accesible through the intake manifold, which was very dark and oily - lost both of my safety shoes in there.

you should have mentioned, that these engines can turn both directions as needed

[J_R_BS]

I'm a 2nd officer on merchant vessels, but I love to learn about the "magic" that happens in the engine room.