Reversing of Marine Diesel Engine
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- Опубликовано: 13 июл 2024
- #shipreversing #marineengine #shipengine #enginereversing
Reversing of marine diesel engine is a reversal of the rotational direction of the engine and thereby the propeller by changing the time of fuel injection, air injection and sometimes retiming of exhaust timing, or poppet valves.
This is achieved by the repositioning of camshafts or having a separate reversing cam and moving the camshaft axially to bring it into position. A lost motion clutch may be used in conjunction with the ahead pump-timing cam alternatively.
Marine engine reversing is the most vital procedure in the ships with fixed propellers in acquiring reversal thrust, attain deceleration, and gain astern movement. Engine Reversing comes into the most important role in preventing accidents and collisions at sea through crash manoeuvring.
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Thank uhh sir i got my answer and how frame this giving everything in sequential manner. It is really very helpful and one of the best vedio ♥️ 😊
Glad to know that the video is useful. Please do share and support 👍
I know Im randomly asking but does anybody know of a method to get back into an instagram account??
I was stupid lost my password. I would love any tricks you can give me
Incredibly helpful, thank you so much
Glad it was helpful!
Much awaited video sir! Thank s for the making video on this topic.
Yes Rahul. It is here atlast.
Please do share and support 👍
Amazing attention to detail.
I'm flabbergasted at the complexity of a simple "reverse" command.
Glad you liked it 👍🏻
Thanks a bunch to really clear the doubt !!, Astern air signal was not known to me until i went through this video!!
Fascinating. I have always wondered about this.
It was so easy to understand, clearly explained, my concept of starting system is cleared now, thank you nice work form Marine Insight
Beautifully shown... thank u
Thanks for liking
Nothing could have been better than this
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:)...You learn something new each day...Awesome animations and editing, especially on reversing the cam rollers...That was such a brilliant engineering decision...It never ceases to amaze me- the capabilities of humans...
Glad you enjoyed!
Excellent visuals and schematics
Thank you sir
Welcome and thank you🙏
thank you sir very good information with short video thank you so much
This was way cool. It would be nice to see your diagrams for the steam version of screw propulsion reversal
great sir
Glad you liked it 👍
Excellent video!!👍👍
Thanks for the visit
We operate 60 year old vessel. Engine rotates clockwise. Propeller changes pitch. From captains order in two seconds from full forward to full reverse. This must be from beginning 1900. Before titanic.
Thanks for amazing video sir
Glad you found it useful. Please do share and support our channel
Another nice video mate, greetings from brazilian shipspotting !!!
Thanks for watching
Great video , take care and stay connected
Thank you! You too!
Thank you
A video on ISM structure and understanding would be nice.
Noted
Superb👍🏼
Glad you liked it. Please do share and support 👍
Nice!
Thank you! Cheers!
Interesting
Great animation and explanation, wonderful job, please try to go in depth
Thank you for your comments. 👍
Nice Sir...
Keep watching
good video my question is about hitched pumps of oil and water of these engines ,about the inlet and discharge in case of change rotation
brother thank you. have IAMI exam soon could not explain how camshaft was put in reverse
Fuel pump timing and air injection timing
thanks for the video, can you also make videos for ME C engine?
Yes, soon
amazinggggggg
👍
Interesting video!
You could improve it further by skipping the first bit until 0:33.
Thanks for the tip!
I thought we were going hear this happen.😞
Thankyou sir .
Could you please make one for ME engine .
@Sagar: Noted with thanks :)
First thanks for this very useful video. If possible to detail the part of air distributor thnx again
This video might help - ruclips.net/video/UnrJYcxfrTA/видео.html
Do ships still use those telegraphs which go clang clang clang?
Can
u explain the servo motor for the 2 strokes engines and the reversing mechanisme for the 4 strokes engines
Thank you for your comment. We will forward your suggestion to the team 👍
Kindly make a video on Azipod...
Thank you for the suggestion 👍
Having three slow ahead is better than one full astern.🤪
😅
Sir which type of arrangement in Sulzer engine air distributor cam for reversing the air admission timing?
a question: An average ship that travels in her working speed, and lets say needs an emergency stop. how much time/distance will it take her to achieve a complete stop?
Is it possible for a marine diesel engine to continue to run ahead following the reversal of air distributor and fuel pump timing. Please Explain why?
Sir can you plsss explain manouvering system by diagram detaily fort all type of engines. Pls consider this and do a video on this!!!!🙏🙏🙏🙏
Hi Deepanesh
Thank you for the comment. Will share your suggestion with the team👍
How the distributor cam is rotated
Тяжко слушать английский язык, а тут ещё невыносимый акцент.
Hey bro what are those things called in the thumbnail?
How long does it take for the complete reversal process to take place? What is the lag time between full propeller forward and full propeller aft?
It will depend on factors such as engine speed, current, wind direction etc.
I'd assume very very long
CPP 38 knots to stop in 420 feet simples
4:05 The spring holding the followers clear is not only to reduce wear when not in use. They also prevent the followers blocking the movement of the camshaft.
also prevent accidental delivery of starting air into the cylinder when engine is firing and one of the cylinder air valve is leaking
WTF is a “wowlve”?
For many years aircraft have used a propeller reversing system which is much simpler than all the mechanisms shown in this video. Is this technology not viable in ship operation?
There are ships that do this. Most notably there are Navy destroyers that reverse propeller pitch to reverse thrust. They need to be able to stop and maneuver more quickly than commercial ships. This mechanism is too expensive and requires too much maintenance for commercial ships
@@johnmiesner Its not that uncommon, most modern ships today use Variable pitch propellers (there are a frew different types). Another solution which, again, can be found of many modern ships is a Diesel-Electric setup where the propeller is driven by an electric motor not the engine itself. Another reason why VPP's are great for cargo ships is that they require different ammount of power to navigate the seas depending on how much cargo they are carrying, you can optimize the pitch of the propeller and maximize fuel efficiency
I believe u're referring to variable pitch propellers, which are very effective for low-weight applications, such as ur turboprops, but are mechanical nightmares for anything the size of a ship!
cpp propeller video sir
Thank you for your comment and suggestion👍
Check this video which shows how CPP propeller works - ruclips.net/video/HTr9C1D7L60/видео.html
Brother what is Panama canal
Check this video - ruclips.net/video/91pnPz7DjS8/видео.html
If this type of equipment comes then the job of lower ratings are in great danger.. Less man power less crew on board..
What about ME engines??
In ME engines, everything is electronically controlled and operated, hence timing can be altered as desired.
@@marineinsight but the principle is the same?based on the angle of the tachometer supply of air is altered on the corresponding cylinder and reverse is achieved?
@@nitarahayu9134 Techometer records engine rpm.
🤔
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Thank you for this video. It is very well done! Two stroke slow rpm diesels make so much sense as they can be directly coupled to the propeller shaft, saving the cost of a gear box. Further savings with a fixed pitch propeller. I have a question. Prior to the engine and therefore propeller reversing, is it only starter air introduced to the cylinders? (No fuel) I ask this as I was trying to make sense of this video. ruclips.net/video/1fs2cU_MsRQ/видео.html They don’t provide much information but it is a container ship reversing. The engine speed (and propeller speed) stay constant until the speed of the ship is such that they can reverse. Is this the moment in time that the diesel stars fire ring? You can hear on the video, prior to the engine reversing, something is slowing down, but it’s not clear to me what.
Thank you for your support 🙏
Why is it necessary to add the extra noise considered "music"??? Makes the narration even harder to understand. PLEASE no more next time.
Noted the feedback. Thank you for that.
very low voice level
thank yu for your feedback. We will definitely work on this.
If I hear another coolie I will unsubscribe to YT!