Keep up the good work!

I was a marine engineer in the 1960's with the Nedlloyd lines from Holland. On our main engine ,a 12 cylinder Sulzer we had main bearing failure of three main bearings , between the last three cylinders. Oh horror, after arriving in port , Papua new Guinea, and when opening the inspection covers, shining the inspection light and seeing all those flakes of babbit underneath the crankshaft. We had spare main bearing shells, but they still had to be hand fitted to the crank journals, we sure learned how to scrape the bearing material, apply prussian blue, turn the shell under the crank, take it out again, check the bearing pattern and again and again until perfect, I believe it took us a week, 12 hours on, 12 hours off to get the engine operational again, and of course we also took crankshaft deflections like chief Makoi so well explained here. What a job, I will never forget! Thank you chief

Hail to the chief! I am a veteran mechanic. Throughout my career, I have worked professionally on everything from cars, to locomotives. But I have never seen anything like this. Thank you chief Makoi. That was one seriously interesting video.

Take note that this is a medium size 2 stroke cross head engine. The big ones are 50% larger bore and 12 cylinders. They are seriously big. I remember climbing around inside these wonders, hammering on everything to check if anything's come loose...in 70C temperature that is...phew... Thanks for the great vids Chief ! -its nice that all the "land-crabs" can see how their necessities are moved around the world. Keep up the good work !

Chief, as a retired Marine Engineer I just want to hand out an "atta boy" for your efforts. Excellent content, very well presented. Wish I had this type of instruction, freely available, when I began learning the trade 40+ years ago. Great experience for the Cadet. He's lucky to get such tutelage!

I'm an aircraft maintenance engineer and I love these insights into other spectrums of the engineering world. Thank you

Dear chief Makio love to watch your upload all the time. I wish you and your you tube were around back in early 1970 when I was sailing and working in shipyard as a young man. You are a good teacher all these youngster are very luck to have you around. They could and should benefit not only from your knowledge. If they don't then they are just KNUCKLE HEADS tell them I say so. Your willingness to teach in the manner your teaching just excellent. May God bless you.

FASCINATING! I LEARN SO MUCH FROM YOUR VIDEOS. ONE OF MY WORK ACTIVITIES IS WORKING WITH CNC MACHINES SO I'M AMAZED WE WORK IN SIMILAR SCALES OF MEASUREMENT.

Loving these technical videos, the functioning of a large ship is something most of us never see and is really fascinating.

I remember taking and doing the readings when as a young sailor, and validating the measurement as a senior member of the propulsion division. Great video!!

It truly is amazing seeing how big these ships engine's are. Its engineering bit on a whole new level to your average car engine. Just amazing. Another great vlog on a ship life and mane the most important part, maintenance.

Hi Chief, thanks for the look inside the engine. Someplace most people will never get a chance to see. Cheers

As someone who has worked on car, truck, and larger diesel engines the idea of an engine large enough to crawl inside comfortably is insane. Thanks for sharing this unique perspective with us. Stay Safe.

I don't want to come off as nitpicking an awesome video, I hope it's not taken that way! There are more reasons that slow speed diesels have a separate crosshead and a straight piston rod. In a two stroke with air inlet ports, there are three options to handle the scavenging air. 1) Pressurize the crankcase. This is what is done with small engines like weed eaters, chains saws, motocross bikes, etc... 2) Use a piston almost as long as the stroke. That way the piston skirt plugs the air ports when the piston is above bottom dead center. This is done with the famous Detroit Diesel / ElectroMotive Diesels, along with many modern marine medium speed diesels. The big disadvantage of this design is it makes the engine longer. 3) Use a cross head and piston rod with a seal. There are several good reasons to want to not pressurize the crankcase. With big diesels like this, the inlet pressure is quite high due to a large turbocharger. The charge air is also quite hot, even after aftercooling. Plus having the scavenge air in the crankcase means the lubricating oil gets into the cylinder and makes soot. Another advantage of the separate crosshead is the crosshead can get excellent lubrication compared to a piston, and the surfaces can be optimized for the job. A piston is only oiled on the down stroke, a cross head can be lubricated on both directions of travel.

Yes, that engine is absolutely massive! Now, imagine the size of the machines that MADE those parts!

Simply fascinating how big these engines are! Thanks for sharing this.

You are a good teacher/instructor/explainer ... your continuing education and entertainment is appreciated. Thank You, Chief.

That slow rotation of the crankshaft is mesmerizing and oddly satisfying!

i was working at MAN diesel frederikshavn denmark. i turn/milled cam shaft for the injection pumps for the 2 stroke engines, and camshafts for the 4 stroke engines valves and injection cam´s. it was amazing to see a brand new engine being started up for the first time, and thinking about some of the parts i made will be somewhere on the oceans for several years . very impressive machines, and imagine, even it is big, the tolerances and presicion is tight and precise as in a motorcycle engine. all workers there was very proud of our products.

As a diesel mechanic, ships and ship engines have always amazed me. Such an amazing machine, the size blows me away

Great video. Thank you, Chief, for both your engineering skill and attitude to teach everyone about naval engines; what you showed in this video is truly impressive...

Thank you for these interesting reports of a for us living on land different yet very important world! Every report is tremendously informative!

Jus sayin' Chief! You do a good job showing what it takes to make the world go round! I used to sail Chief Electrician on APL C10's. I held a 3rd's Steam License at the time. I always asked my Chief Engineer if I could 'play' Engineer when we were LA where we replaced 2 cylinders of the Sultzer 12 cylinder engine. They were also doing an alteration on the cam lifters. I did a video of one time, but part got erased with a video of a Dutch guy in Kobe, explaining the history of Santa Claus through the different cultures! What can ya say? I worked for 5 (8+ total) years in the US Navy, mainly 38a Shop stuff. Fixed em, built em, and sailed em for another 40 years. Most people don't understand how massive and powerful these engines are, and the precision that is required for them to operate at the power levels they do for prolong periods. That said.. I still prefer the hum of turbines over the thumping of a diesel! Keep it up!

Wow! Thats a big engine, dangerous parts and must be very precautioness, awesome, never imagine les then this, you have machinery so clean, congrats to all of your crew & hanks 💯👌👍

I am descended from mariners on my father's side of the family. I love learning about these things. Thank you.

It's amazing how big all the components of these engines are. Thanks, Chief!

Best video I've ever seen upon this subject. Congratulations, and thank you so much for sharing it with us.

What You Haven’t Seen - KZfaq channel just posted: Engine Fire Aboard Containership “President Eisenhower”. Great reminder of why you perform maintenance and practice emergency procedures.

I know nothing about stuff like this, but find people's knowledge and skills fascinating. Thank you 👍

CRITICAL WORK BY OBVIOUS WELL TRAINED PEOPLE … what a great boss and mentor is Chief …💪💪💪💪

Thanks Chief your videos are educational and just fascinating. You must have been one hell of a instructor at the academy.

This is very interesting. I had the opportunity back in 1991 to visit the engine (room) of a large ship. Our port was the first port of call on the ship's life with cargo and we sway a couple of engineers come out the "opening". For us visitors seemed strange. The chief engineer explained they were checking tolerances. Thank you for sharing your knowledge.

Thank you Chief MAKOi for all that you do. I keep learning something new everyday from your contents. Recently kicked off my career as an engine Cadet and my appreciation knows no bounds🙌🏾

Reminds me of my days at sea, loved it. Never worked on these modern engines, loved my Doxfords !

Thank you Wonderful video creation

That's a very elegant way to check for misalignment and bearing wear. I love it.

What an absolute beautiful piece of machining and engineering.

Thank you Cheif Makoi.. For bringing back the memories..

Remember when in the early 1993 being in Harland and wolf when an B,&W engine getting built in the first off. A series of suezmax tankers ,, now I work doing ship repair but ferries have various engines ,,V16 7 &9 cylinder engine nothing big like tankers ,, but it is important work and a good job ☘️☘️☘️☘️☘️☘️☘️ from northern Ireland great video 😁😁😁

Awesome video with crystal clear narration. Thank you Chief... 👍🙂

My old man was a warffie in Melbourne VIC and when they had big jobs on we were hired as casual labour when I was 15 I was lucky enough to work inside the bore of these massive engine on a ladder with hammer and chisel chipping away the carbon build up I remember putting my elbow to elbow touching the inside diameter even back then I thought how many people would ever see this and getting over $100 a day another job was pulling a 5 ton altanator with blocks and chains awesome experience.

I can’t imagine being able to crawl around inside an engine. You have a fascinating career. Thanks for sharing it with us.

Great vlog as always! Looking forward to the next one. Happy sailing my friend!

I want one of these engines to put in my 3/4 ton Chevy pickup!! Seriously, anytime you can walk around inside the bowels of an engine, you know it's freaking massive! Great video, though, learned little bit about these massive engines.

The fact that you do these regularly is just amazing, like in a car this wouldn’t really be done as it’s easier to measure the main bearings and the crankshaft diameter directly Very cool to know these things !!

Thanks! Always learn something new watching your videos! Cheers, to the Team!

Very informative. I'm an auto mechanic so this quite interesting to me. Great footage!

I'm studying for my oral examinations so thank you for providing me with guilt-free youtubbing.

Thanks for the video. I learned something really interesting today. Best wishes to yourself and all the crew.

During a 10yr survey on a medium sized coaster GRT 1600 , B&W alpha V18 of around 2610 B.P.H. The chocks were to be renewed so ,old ones removed , holding down bolt holes blocked off whilst the resin set and after web deflections checked found out someone had used short lengths of broom handle to block holding down boltholes instead of cardboard or the like. Whole lot had to be redone....red faces as company supervisor hadn't noticed . oops. Used bunkers not heavy oil ,but still had all the pipework and heaters for heavy . Smooth as silk once past critical revs , air start ,mated to shaft genny and then cp prop. Took us safely through 87 hurricane in North Sea as only engine , no aux, 3 day trip took 6 due to massive seas ,can't remember LOA but were looking up at the wave tops from the bridge. M E never faltered once. Lost fair amount of deck cargo tho, all dressed timber ,wires and bottle screws just weren't enough for those extremes . Only Kent screen was working after waves took out bridge wipers..exciting stuff at times...

Cool video Chief. Thanks for showing us a glimpse of your world.

Engine Temp. 42°C, in THAT hole with the engine turning: No Thanks! Great Respect!!

Simply love it. Great content! Thanks

Thanks for this. It's something us land-locked mortals have never thought of.

Just think of the size of the CNC machine that machined that crank WOW ✌️🇬🇧

I would like to say how refreshing and relaxing it is to be able to navigate 🙂 away from the videos and toxic comments on the situation in Ukraine to the Chief's Channel to watch a new video. Thank you so much Chief 🥰 .

Great video, and really cool to see. Thanks for sharing!

Awesome l! Thank you for the education and great quality videos!

It's so crazy that you can walk around inside the crankcase around the crank and big ends.

great video! kudos to the camera guy. got right down to the nuts and bolts. love this channel.

Fascinating Chief! I had no idea you had to do this as part of regular maintenance. Egad those engines are huge and very beautiful inside.

I wouldn't want to be around when an engine blows out!! 😲😲 As usual, another well put together video showing things I never knew happened on a ship. Very informative.

Great video. Thanks for sharing

Chief please do make a seperate videos on Crank case explosion with some videos like you have shown here

Cheers from the Pacific West Coast of Canada.

Great information, thanks, Chief.

you keep us on the edge of our seats man.

Chief As an automotive mechanic I wondered where they hid the wrist pin. Now I know, which leads to the question, how is the pin "torque plate" wear adjusted and how is it lubricated? Your next video?😁

i presume that an engine fitter has a big part in this work, i can just imagine how hard is the job of my husband..thanks chief for this informative vlog.

Those engines are an incredible piece of engineering.

Thanks for posting Chief❤❤❤❤

Keep up the good work mate watching from Australia 👍👍👍👍👍👍

Excellent video, very informant,looking forward to more keep up the good work.

God bless sir Chief and the engine team, also new learnings for us beginners in this Profession 🙌

Quality presentation as always.

Chief.. the amount of stroke on those pistons is very impressive.. Much love from Michigan here in the US.. Keep up the great content. Love when you guys get to BBQ and have some relaxing times on the deck..

It must be fascinating the first time you are inside an engine. Very interesting, Chief!

this might not be the "sexiest" video, but I really enjoy learning more about the technical side of these massive ships and the upkeep/maintenance required.

So beautifully clean 🙂 ! Nice guitar music 🙂 ! Well done Chief and your team 🙂 ! I hope no-one was injured or killed when those crankcases exploded !

I always knew a ships engine was large, but never expected that you have to go INSIDE it! Makes a small block 350 look microscopic!

Another very interesting report. I learned a lot. Thanks, Chief.

Thank you verry mouch for sharing this, also i like the music style alot ❤️

Super interesting connecting rod configuration.

You and the entire crew work so hard! Thanks!!

I so enjoyed this one.. reminds me of learning to work on my own lil sail boat engine a Perkins..it's amazing the size an work to keep everything tickety-boo... ✌🏼💗😊❣️

Hello Mako i igood to listen you excellent video. Thanks for sharing.highly. professional job. Never seen befor .thanks.

chief more videos about engine cadet duties :) more power!! safe travels.

What a great video thanks for your efforts and really good job on the video edit and overall production. Cheers from Australia and a new subscriber. Thanks again👍

the sheer size of it is so mesmerizing

Awesome video Thanks for sharing chief

If there were such a category as Super Gold Thumbs-Up, you'd get it, Chief. You get straight down to business without lengthy Hollywood intro graphics and silly music, neither do you assail us with multiple selfies to promote your personal image. Your followers know that and appreciate that you are a good teacher, not primarily an entertainer.

This cadet is so lucky to get a chief like you! I signed my first vessel off recently as a TME, i too had a chief engineer like you who always helped me to clear my concepts. Unfortunately he had to sign off quickly😢. After that one chief came he was a dumb ass. Neither he didn't know anything nor he was interested to teach juniors.. he always used to complain about junior engineers..!

I first experienced cross heads and their function on large stationary compressors when I worked for Cooper energy.

Keep them coming!

Nice vid. safety glasses are a good asset when looking up at things dripping oil. Another good vid thanks Makoi

Love these videos I worked on these big motors here and there you definitely know your business good job 👏🇺🇸🇺🇸

FANTASTIC video!

Another great video. I am not really claustrophobic, but sharing a limited space with giant moving engine components does give me pause. Mark, have you ever seen the Steve McQueen movie, "The Sand Pebbles"? If you have, you will know of the scene I am thinking about. If not, I am not going to give it away here!

Love your videos mate , great tech !

Crankshaft Stresses Following are the kind of stresses that acts on a shaft and they are as mentioned below: Torsional Bending Axial Shear Forces Torsional stresses occur due to the twisting forces developed in the shaft when it rotates. Actually it twist in one cycle and then untwist itself on the other one. Shaft should be able to take such reversal of cyclic loads and not fail under such conditions. Generally we only see the average speed of the engine, but in actual conditions it may be less or more, depending on the different units firing at that time. So sometimes it retard or accelerate depending on the firing of each unit. Bending stress are developed due to the firing and compression forces developing on each unit and also when the load changes. So a unit which is not firing will have lesser load on it’s crank while the one which will fire going to impose more load. Also if the bearing clearances are out of limits, there will be more bending on the shaft. AXIAL stresses come on the shaft from the propeller side, also the hogging and sagging of the shaft. Axial vibration damper is fitted to dampen such stresses. Shear stresses are developed when the crankpin is in stress due to compressive forces developed by the combustion gases. And a moment is developed around the journal bearings, causing a shear force. - Deflection for the Shaft Taking deflections for a shaft is quite important activity onboard. Deflection reading is a sign of wear and tear of the main bearing. Also it indicates any sagging of the transverse bearing carrier.