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Old 15 September 2009, 13:58   #11
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Nah I meant much bigger - modern engines over say 1000hp. Usually pretty modular in construction.

Then again modern engines are nowhere near as good as the old slow revving diesels - old B+W - Kelvin - Lister Blackstones etc etc. Often would weigh about 8 tons for 300hp but they were huge and you could take down pistons while it was still running as you can on the huge ship engines now.
These boys will know, I've been around the place "big engines"

http://www.dfcspares.com/remanufactured.htm
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Old 15 September 2009, 14:30   #12
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Thanks Guys, looks like there is no easy answer as we suspected.

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Old 15 September 2009, 15:36   #13
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Seems on large steel vessels you dry dock them and cut a big hole in it!
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Old 16 September 2009, 15:22   #14
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Yup anything big and steel, they just cut a big old hole ion the side and weld it up afterward
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Old 16 September 2009, 16:18   #15
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No No the real answer is if the engine goes they just go and buy a new boat!
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Old 16 September 2009, 16:25   #16
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Yup anything big and steel, they just cut a big old hole ion the side and weld it up afterward
Which is fine on a trawler but I think your Arab Sheik might be annoyed if you attacked his GRP Mega yacht this way

Who Knows Nasher .. maybe when they are that big .. they've got some metal in 'em ?
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Old 17 September 2009, 14:34   #17
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No No the real answer is if the engine goes they just go and buy a new boat!


Best answer yet!!


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Old 17 September 2009, 17:41   #18
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The larger Sunseekers where the engines aren't located under the aft deck which can be removed for access there are access hatches through the deck levels. Means some furniture has to be removed but even on the 100ft plus you could remove both engines after a couples of days work.
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Old 17 September 2009, 18:03   #19
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The larger Sunseekers where the engines aren't located under the aft deck which can be removed for access there are access hatches through the deck levels. Means some furniture has to be removed but even on the 100ft plus you could remove both engines after a couples of days work.
Ah ha. Thank you very much

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Old 18 September 2009, 08:42   #20
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Which is fine on a trawler but I think your Arab Sheik might be annoyed if you attacked his GRP Mega yacht this way

Who Knows Nasher .. maybe when they are that big .. they've got some metal in 'em ?
When you reach the size of super/mega/gigayachts the vessel is steel, actually classified as a commercial cargo (12 or less guests + crew) or passenger vessel (12+ guests) depending on the build standards. To smooth out the imperfections the hull is coated with a roughly 5mm thick layer of levelling compound and finally a layer of gloss white paint is sprayed on.

The vessel is built around the engines, repairs are generally performed onboard and cranes fitted in the Engine Room for overhauls and repairs.

Should it reach the point that the engine needs removing, as has been said above, the vessel is drydocked and an opening cut into the side. The engine will be removed/replaced, then the opening is rewelded and work commences on restoring the paint job. The paint job may cost $1million+ as it may require the entire vessel to be repainted to colour match. The drying times and conditions for the paint means it can take 3 or 4 months to complete the paint job, either in a paint shed or scaffolding built over the vessel, dehudifiers and heaters installed, dust removed from the air etc.

Hope this explains!
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