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Old 08 October 2015, 10:10   #1
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Mercruiser 6.2 engine fail (again!!)

Not rib related but I'm after some advice and thought somebody on here may be able to help. I have a maxum 2700scr, I had a brand new engine, bravo III leg and props fitted by abc marine in 2007. I have had it serviced by them every year since then as well. A couple of weeks ago I went to take it for a run, (it is moored in Victoria dock Caernarfon) started up ok as normal, I left engine running as I removed ropes and fenders. Got back on boat ready to go and the engine cut out. Tried to start it and it wouldn't have it. Tied it all back up and left batteries in charge overnight, came back next day and tried to start it again. Still wouldn't have it, anyway after abc coming out I towed it to their yard in Beaumaris, they have since removed the engine and have said that it is frost damage. I find this hard to believe because I have used the boat quite a lot over the summer approximately 50 hours and it has been fine. Abc rebuilt the engine in 2013 because they said it was water damage caused by washing the decks and it going on to engine and it not drying out properly. I feel as though abc are having me over a barrel here and want advice on what I should do next. They are advising me that it now needs a new engine. This engine has done 268 hours from new and that includes being rebuilt once!!
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Old 08 October 2015, 10:25   #2
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Old 08 October 2015, 12:18   #3
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What a load of bull! If it turns over fine i would say its fuel/filter or dodgy wire on ign side as an initial thought!
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Old 08 October 2015, 12:34   #4
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Frost damage on a mercruiser normally means a cracked block fyi.

Tbh there is not enough info to really help you here. I can only assume as the engine is out the block has cracked. Whilst I don't know temps where you are, it has not been cold enough to cause frost here yet. Google can give you the answer on lowest temps where you are for this month as proof (maybe) it can't be frost.

Did you always empty the drain plugs in the block after each use? It was a ritual on a 5.7 I had years ago.

I guess it is possible if you have never drained it the crack was done over winter and got worse to the point you are at now.....this is assuming there is a crack of course.

Need more info as I said, what exactly do they say is wrong?
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Old 08 October 2015, 13:18   #5
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I dont think that it has been cold enough to freeze this last winter, It is in a tidal lock which has fresh water running into it. I have never emptied any drain plugs and I didnt know there was any on this engine? The crack is on the exhaust manifold apparently, although I couldnt see it myself. The plugs on one side are a little rusty, especially the rear plug. I have a couple of pictures I will upload now
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Old 08 October 2015, 13:21   #6
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Old 08 October 2015, 13:37   #7
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hmmmm.Im assuming the pics are before the re build or have you stripped down the engine for the second time?... looks like there has been piston damage on that one.. head gasket failure poss. TBH its looks in poor condition really. lack of use is an engines enemy!
Can I see milky oil by the cam carrier?
Did you do a compression test? or have you?
The piston rings/scraper rings look jammed it looks like.
More detailed pics could help a bit more. if the block has broken on the outside it will still run Will.
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Old 08 October 2015, 13:49   #8
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it is definitely not head gasket failure, they have also been used quite a bit this season, at least once a week
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Old 08 October 2015, 14:30   #9
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Assumption again....the manifold cracked due to freezing over winter and here you are.

I am no mercruiser expert but I'll be surprised if you don't have drain plugs on the block and manifold which probably would have prevented this.

If the engine was fitted new then perhaps the owners manual recommends to empty it? If none were supplied then perhaps the installer should have showed you??? I.e they need to take some of the blame and hence costs.

EDIT- according to Google there are 4 on the engine, one on each manifold and one on each side of the block it looks like at a quick glance on most new v8's....ymmv.
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Old 08 October 2015, 14:45   #10
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I have never been told of any drain plugs at all for this engine, I have definitely never drained it down after each use. I will be going back in to see them next week and will report back with what they say
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