Starting Air Valve

The starting air valve of the marine engine is one of the most important equipment as without it, the engine will not be able to start. The air starting valve in the marine engine is fitted on top of each cylinder head and supplied by air from the main air bottle at a pressure of around 30 bars.
The main engine starting air valve works on the basis of timing, controlled by the air supply from the air distributor of the air starting system of the main engine.
the starting air valve and system of MAN engine is slightly different than that of a wartsila/sulzer engine. The working of starting air valve of both the engine is explained in this video.
Most Common Problems in Air Starting Valve:
Sticking of Valve: This happens when there are carbon and soot deposits on the valve, seat spindle, valve piston etc., making the valve difficult to close fully.
Leakage of the valve: Sticking of the valve may also cause valve leakage as the valve is not closed fully. The best method to find out if the valve is leaking or not is by checking the starting air pipeline temperature, especially during manoeuvring and starting up of the engine.
Valve stuck in open position: When the air starting valve of a unit is stuck in an open position, it is advisable to cut off the unit by lifting the fuel pump roller of that unit, and replacing the air starting valve once the engine stops.
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[@elifmeryemklnc1542]

i found it very useful especially your illustration on the real engine. I like animation videos but sometimes i cannot identify many engine part when i see on real engine, so i like to air starting valve on the real engine head.Thank you for your effort.

[@marineinsight]

Thank you for your comment. Please do check this infographic which can come handy ---encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQDYeLCLfvMOVwtUIuNuhNhZhmV8ZOnedmDSPL8TUva_6ivHzA8

[@TheAlexgert]

Hey how is involved in shipping industry a buty like you ? I am very curious

[@ktoectbkto]

Would like to add a correction: On a Wartsilla engine, pilot valve(5/2 valve) uses same 30bar pressure coming off the main air supply header, not 7bar.

[@Jonas-nl4hq]

Cant say underrated but this is truly helpful not just fir marine engineers but all engineers out there, hope you'll keep on feeding us with more knowledge about machineries. Would definitely recommend this to all who are and will pursue a career related to marine engineering. They also have website for referrences

[@marineinsight]

Much appreciated!

[@deepaneshk3672]

You have told distributor pilot valve press is 7bar. pls Explain me from where it's come as 7bar.

[@imran5599]

please make a vedio an oily water separator.

[@benarexkoffi1508]

Thanks. Before the valve open where goes the air from the air manifold?

[@edong7008]

Thanks for your explain
I wonder if the starting pressure drop to 8 bar.such low pressure still strart can the engine or not?

[@smt5]

G8 explanation👍

[@marineinsight]

Glad you liked it. Please do share and support 👍

[@micaiahben8983]

very helpful explanation.

[@Historyofiraniankingdom]

excellent 👍 greetings from IRAN

[@marineinsight]

Thank you 👍

[@expertcitizen]

Please same video of boiler easing gear working n maintaince along safety valve actual dramatic working

[@marineinsight]

Well Noted Kshitij. You can also check our ebooks on Marine boiler - learn.marineinsight.com/eBooks/e-marine-boiler-series/

[@TheAlexgert]

How many cylinder must be moved from air to start the engine and when they are make reverse

[@anantanandi1957]

All of them one by one in sequence of firing order,as in head direction,only firing order changed in distributer,
few degree overlap might be there in some engine to help to start if any one starting valve malfuction

[@md.saifulislamraj6728]

please define main air valve

[@harryssidiropoulos8434]

I think on top of the valve the air pressuring the spring is 7bar and thats why there is a difference of the diameter of the pistons inside the air starting valve..am i right?

[@marineinsight]

Yes. 👍🏻

[@WardhanAbhigyan]

Initially in sulzer engine, it is shown that from control valve air is being supplied on both the sides of piston and valve is in shut position but later to shut the valve upper face air is being vented . I just want to know how the initial state is achieved after this that is air in both sides of piston?

[@gabrielpires-world]

Thanks for your excellent explain.

[@marineinsight]

Glad you liked it

[@imran5599]

Very Nice

[@thantzinaung6650]

May I know the directional control valve pressure how much is?

[@souravchetia692]

What, Why and how blow through is done before starting the engine??🤔

[@marineinsight]

What - It is an air blow inside the cylinders
Why- To check if there is any water or oil accumulation due to leakage.
How- Staring air is supplied to the engine keeping the telegraph in start position without supplying fuel.

[@souravchetia692]

@@marineinsight ..If blow through is done to check fuel or water leakage then why do we use turning gear for checking the leakage of oil or water in the cylinder prior to starting the engine?

[@anuragtyagi8779]

@@souravchetia692 Because while blow through it is also confirmed that starting air valve is leaking or not . If turning gear is used to turn the engine thn amps will increase if any water content is present inside .

[@souravchetia]

What is a crosshead and piston rod?🤔

[@marineinsight]

The Piston rod is connected to and carries the piston. In 2 stroke engine (which are usually long-stroke engines) the piston rod is connected to crosshead which connects the crankshaft through the connecting rod. Please check this video to understand how this component looks like - ruclips.net/video/OfDr1lEe0Cg/видео.html

[@souravchetia]

Please answer my query!!🙄🤗

[@marineinsight]

Just answered it above 👍🏻

[@danrice5494]

0:31 What is the pipe which is going from top to bottom in each cylinder used for(the letter 'r' in pressure is on that pipe I am asking for)?

[@marineinsight]

Hey Dan, That's Hydraulic oil supply pipe for Exhaust valve. For more details, please watch this video - ruclips.net/video/jdmJGF7XXJ8/видео.html

[@nikhillllLlllllllllllllllll]

awesome channel. learnt a lot. Could you make a video on electrical system on ship.
thanks;
like,comment and share guys

[@marineinsight]

Hi Nikhil. Thank you so much for your support. We have forwarded your suggestion to the team. 👍🏻

[@idhamleamsi9343]

@@marineinsight sir i would like to know what is gagging of an air starting valve whilst the valve is found leaking

[@sfasfaf4855]

please explain about air/fuel interlock in main engine

[@marineinsight]

Thank you for the suggestion

[@markbeale7390]

Air start shut off when fuel lever advanced from start position, by pilot air valve supplying air start distributior.

[@kuttychutties7549]

Bro , still I confused , at which stroke of the engine the air is supplied and how it came out from the engine at which stroke

[@scricketball]

I believe at top dead center

[@DJays_Aviary]

What is the use of control air from air bottle? Is it for closing the exhaust valve?

[@CLASS4ORALS]

Hey Guys, Please find the Link to Previous Video on Why Main Engine is not starting on Air
ruclips.net/video/1l86UjV5m80/видео.html