Motorboat replacement engines project and a bit of a refit.

Moodysailor said:
The major conversion clause doesn't have any relevance to the year built, and it's this that has the potential to catch some people out. I don't think it's an issue for you, but I wanted to clarify that the year the vessel was built doesn't matter - if you trigger a major conversion clause, then a PCA (post construction assessment) will be needed for CE approval. Major pain, and possibly big bucks....
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And who is going to check?
 
Eurgh! What a mess!

They are out, took 30 mins to lift them with a telehandler.

20201113-100418.jpg


There is several inches of oily sludge at the bottom.

Next job clean out all the oil, then a cockpit cover.
 
The bad news is the the input shaft on one gearbox, maybe the other one too, shows a lot of wear. She has after all been in commercial service in the past so doubltess done a lot of hours compared to a leisure boat.

New boxes will be £4k, not what I was hoping for!
 
burgundyben said:
The bad news is the the input shaft on one gearbox, maybe the other one too, shows a lot of wear. She has after all been in commercial service in the past so doubltess done a lot of hours compared to a leisure boat.

New boxes will be £4k, not what I was hoping for!
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Ooch
 
burgundyben said:
The bad news is the the input shaft on one gearbox, maybe the other one too, shows a lot of wear. She has after all been in commercial service in the past so doubltess done a lot of hours compared to a leisure boat.

New boxes will be £4k, not what I was hoping for!
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New input shafts not an option?
 
Do you mean gearbox shaft splines? They often wear in the drive plate due to the 'rattle' of extensive ticking over, especially four cylinder. Take heart, if not severely compromised the likelihood is the shaft will sit in a different place on a different engine. You can even stand the driveplate off the flywheel with spacers. In any case, replaceable, surely?
I have mentioned before the service I had from Ford Dovers. 12000 hours plus. Both were Mermaid rebuilds. The next version was the Otosan, similarly robust AFAIK. (very slightly different feet position, is why I didn't get one). I know people still running Dorsets. The only problem is the shortage of blocks to rebuild, no surprise there, they are endlessly rebuildable.
 
pvb said:
On the contrary, I think you were antagonistic in suggesting in the first place that simple re-engining was a potential problem!
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Not at all, and re-engining a boat with something more powerful may stress parts of the structure that were never designed for the increased power.

Remember, the 'chief engineer' that approves a design before it is built not only is an engineer, but effectively underwrites the safety (and conformance to applicable standards) of the design before it is built, tested and used in regulated circumstances. A friend who had chief engineer responsibility had professional and personal liability with his employer to the extent that, if there had been a problem and he had been proven negligent, he was off for prison time.

Increasing engine power is a change to a design 'owned' by a person and a company. Change it if you see fit but remember that the liability for you and future owners is actually transferring to you.

And remember to tell your insurance co. (like I did) as they might use a change to the approved design to wheedle out of a claim leaving you out of pocket, potentially to the tune of £millions.
 
langstonelayabout said:
Not at all, and re-engining a boat with something more powerful may stress parts of the structure that were never designed for the increased power.

Remember, the 'chief engineer' that approves a design before it is built not only is an engineer, but effectively underwrites the safety (and conformance to applicable standards) of the design before it is built, tested and used in regulated circumstances. A friend who had chief engineer responsibility had professional and personal liability with his employer to the extent that, if there had been a problem and he had been proven negligent, he was off for prison time.

Increasing engine power is a change to a design 'owned' by a person and a company. Change it if you see fit but remember that the liability for you and future owners is actually transferring to you.

And remember to tell your insurance co. (like I did) as they might use a change to the approved design to wheedle out of a claim leaving you out of pocket, potentially to the tune of £millions.
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Guess you didn't read post #1 ?

Replacement is a pair of Cummins 4B, same weight, same capacity, same HP at same RPM.
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Perhaps Ben might get sent to prison because they are the wrong colour ?
 
Saw the title and thought it looked interesting so read the thread and thought I had strayed into the lounge ?

Not sure why folk appear to get a bit fractious because someone simply offers a ‘heads up‘ that can be taken onboard or not and presumably offered with the intention of being helpful. Personally I prefer to know stuff and to take informed decisions about ignoring it rather than sleepwalking into what might be a problem.

Anyway, leaving all that aside the subject of the thread is interesting ?
.
 
PaulRainbow said:
I think Ben will probably not get arrested for changing his engines.
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I reckon you're absolutely correct! People replace leisure boat engines all the time, usually with similar power units, and nobody bats an eyelid. As for telling the insurer, my insurer never even asked what engine was in the boat.
 
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