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Old 29-08-2013, 07:53   #1
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Location: Bribie Isl then permanently cruising from Feb 2013
Boat: 2006 Lagoon 440
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Unhappy Leak from engine mount casing

I'm experiencing a worsening salt water leak entering the starboarb engine bay via the starboard forward inboard engine mount and from the 14mm hole just behind the engine mount on the engine support pedestal for my 55HP Volvo Penta sail drive. I'm manageing the leak OK via the auto bilge pump in the bottom of the starboard keel and probably can't determine the exact cause until we lift the boat out of the water for winter in Turkey. Has anyone else suffered similar expriences who might be able to identify the cause of the leak starting and how it was resolved?
Thanks, Col
finally my darling
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Old 09-10-2013, 18:51   #2
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Boat: Chris White Atlantic 46lr
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Re: Leak from engine mount casing

I would be careful of any water ingress into a lagoon engine room.Take a read of this website, where the dinghy painter got caught round the saildrive and ripped the engine off its mounts!!!, causing engine room flooding and subsequent boat sinking on a virtually new lagoon 500
Lagoon Litigation | The facts, the litigation, the arbitration and issues.
I would also check your bulkheads as it seems that they do not have to be watertight under CE regulations, and were the cause of the sinking...amazing
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Old 10-10-2013, 00:46   #3
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Location: Bribie Isl then permanently cruising from Feb 2013
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Re: Leak from engine mount casing

Thanks for your response. The leak is relatively light at about 10 lph and has remained constant. Their appears to be no break or leak in the main diaphragm ring. Our boat comes out of the water for winter storage in Marmaris, Turkey in about 21 days weeks so I'll get a chance to fully examine the sail drive and the mounting casing while the boat is dry. I'm advised one of the service agents in the marina has a long period of service with Volvo Penta, and in particular sail drives so fingers crossed we can get to the bottom of the issue. Otherwise, I'm a converted Lagoon 440 nut and wouldn't be cruising in anything else!
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Old 10-10-2013, 03:23   #4
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Re: Leak from engine mount casing

2011 Lagoon 450, water coming out of the hole in the engine bed on port side, No access from inside the boat. Boat was hauled , bottom inspected and no issue found. FRP cover plate which surrounds drive leg removed. the coverplate was held in place with something like 5200 and some of the gelcoat came off with it revealing an extremely thin laminate which was measured at 3mm (not a misprint) thick.
Water was going right through the hull in this area !

Full disclosure, the cover plate did appear to have been off before.
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Old 10-10-2013, 05:58   #5
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Re: Leak from engine mount casing

That sort of fits. For some reason the cover plate that goes around the leg (the cover plate I believe is to block sunlight entering and encouraging marine growth) and leaving only a 5-6mm gap for leg movement, was partly broken away when the boat was slipped March this year and we made a new plate out of 3 mm black poly material which was fixed with Sika. It is still in place, but I think whatever the leg impact was that broke the plate might have also cracked the laminate inside so we'll go looking for that as soon as we slip in the boat. Great input!
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Old 29-10-2013, 09:15   #6
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Re: Leak from engine mount casing

Happy news about my engine leak. After being lifted on to the hard stand at Marmaris Yacht Marina yesterday 28th October, water was seen to flow freely from the forward end of the casing in front of the sail drive. Within 30 minutes, we determined that the leak had been created on the slip at marina Bettina at Muhrter in Croatia by an over-zealous maintenance guy when he fitted 10 X 3mm screws to hold on the plate that stops sunlight entering the void around the top of the sail drive leg.
After a day, the area had dried and we drilled a larger 10mm hole to alolow the are to dry over winter. In Spring, we will repair the area with Epoxy resin and woven mat, and affix a new cover using SIKA, without any screws!
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