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Old 28 July 2013, 11:27   #11
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Quote:
Originally Posted by Solent Ranger View Post
The following pictures were taken of a 225 hp ...
Two possible scenarios? Water into engine somehow and engine threw a rod, or engine threw a rod, punched a hole in the crankcase and water got in?
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Old 28 July 2013, 11:31   #12
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agree, with that, unless the engine had stopped at speed and the water was forced up the exhaust is possible with nil back pressure to hold it back
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Old 28 July 2013, 12:07   #13
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wow I thought that outboard engines would have been designed for things like stopping quick.

Hope his insurance pays out.
I'd have thought the same.....bad design if that can happen just by stopping quickly.
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Old 28 July 2013, 12:14   #14
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I'd like to know could this sort of thing happen when launched quickly of the rollers?
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Old 28 July 2013, 12:31   #15
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agree, with that, unless the engine had stopped at speed and the water was forced up the exhaust is possible with nil back pressure to hold it back
That is what happened. Or so I am lead to believe. As the engineer working on it said - we will never really know the truth! It happened a week ago!
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Old 28 July 2013, 13:38   #16
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+1

Would be interesting to see exactly how that could have happened if the engine was running to get water back past the exhaust valves etc, against the flow of the exhaust gasses?
Fully plausible, as I have seen it on a V8 powered direct drive inboard boat. The exhaust flapper was defective...errr missing, and it back flowed into the engine immediately seizing it. The event happened as they came to a stop from speed. Required a complete motor overhaul, as it was salt water.

Although on an outboard I am not so sure I understand how? Plus that looks like it locked up at around 2,000+ RPM. Breaking hardened steel connecting rods usually takes more than a failure at idle. Laughingly I have seen many offroad vehicles suck water in and shut down to be cleared out, started back up, and continue down the trial.
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Old 28 July 2013, 13:40   #17
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That is what happened. Or so I am lead to believe. As the engineer working on it said - we will never really know the truth! It happened a week ago!
I reckon someone's telling porkies. It wouldn't have broken the conrod and smashed the crankcase on an attempted restart-thats had water into the cylinders while it's revving.
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Old 28 July 2013, 13:49   #18
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-thats had water into the cylinders while it's revving.
How does that occur? stopping fast and reverse and take water into ?
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Old 28 July 2013, 13:50   #19
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A tripped race boat could give that sort of result. It needs to take a lungfull with revs on to bust things up to that extent. The exhaust/back wash story is guff.
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Old 28 July 2013, 14:10   #20
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I reckon someone's telling porkies. It wouldn't have broken the conrod and smashed the crankcase on an attempted restart-thats had water into the cylinders while it's revving.
+1

And if it was revving, there is almost no way you can get water back against the exhaust flow, up the exhaust, by the wash following the boat

Thats more like a capsize with the engine revving, and dragging in water through the airbox.
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