What happens when you stop to quick!

[Solitaire]

The pictures below are of the results of what happens when you come to a sudden stop and water goes into the engine via the exhaust system. The engine is a 225 outboard. Well stuffed.

Glad it was not my engine!

 

[rafiki_]

Ummmm. Quite terminal. What's the story?

 

[MapisM]

Glad it was not my engine!

Geez, +1 for sure.
Water reversion can indeed be a killer, but I've never seen that happening with an o/b.
I'm also curious to hear more.

 

[Robg71]

thats some impressive damage....

 

[jimmcgee]

so they left the engine for a couple of months before they stripped it then, cos there is no way in hell that's instant water damage.

 

[P4Paul]

so they left the engine for a couple of months before they stripped it then, cos there is no way in hell that's instant water damage.

+1.

 

[Richard Shead]

I managed to do a similar thing with a 25 merc which landed on top of me.

New head (engine) needed. I just had a lucky escape.

 

[vas]

confused,

ok, engine fills up with salty water.
They leave it to rust for a semester or so, and then they try to start it up and breaks apart, breaking conrods and holing the block???
sorry, I don't quite get it....

cheers

V.

 

[Vitesse]

I'm thinking there's no way you'd do that damage using the starter so it had to be hydraulic lock while running. How long would it take for the cylinders to rust like that? A few days? The water would have stayed in when the engine locked up.

This is why you never accept a helpful tow start when your car conks out in a flood!

 

[[2068]]

I'm guessing the hydrolock and the "big badda boom" happened on the day.
Then depression set in, and the post-mortem happened sometime later.

 

[vas]

I'm guessing the hydrolock and the "big badda boom" happened on the day.
Then depression set in, and the post-mortem happened sometime later.

OK, this scenario makes more sense FP,

now explain how you can hydrolock an outboard!!!
I guess WOT and dip it in the drink somehow would be sufficient...

V.

 

[rbcoomer]

OK, this scenario makes more sense FP,

now explain how you can hydrolock an outboard!!!
I guess WOT and dip it in the drink somehow would be sufficient...

V.

I think that's the reference to stopping too quick - i.e. overtaken by wake = temporary submersion! Re: the corrosion, I'd say that was in the time it took to get around to dismantling it - perhaps a few days. Hot engine + saltwater ingress + air via hole in casing = quick corrosion (Not that it would have made much difference to the outcome in this case)

 

[[2068]]

OK, this scenario makes more sense FP,

now explain how you can hydrolock an outboard!!!
I guess WOT and dip it in the drink somehow would be sufficient...

V.

From another forum:
Yamaha + Panic stop from high speed =

######

I can definitely see water ingestion through the exhaust ports as a cause for failure.. Many 4 stroke engines (especially those with variable cam timing) have a tendency to actually suck air back into the exhaust port for a split second between exhaust pulses, or, on deceleration if the camshaft advances to keep emissions down while there is no load. A few automakers have done away with EGR valves, and actually use exhaust cam timing/phasing to suck air/exhaust back in on deceleration. So, if he jumped off of plane quickly, I could see water surrounding the exhaust ports on the back of the cowling, and flooding the engine. This would hydrolock the motor, and either bend or break connecting rods, wrist pins, or pistons..

######

 

[andy59]

Surely a large outboard manufacturer wouldn't build an engine with the potential to let water up the exhaust ?
Where is the air intake on a motor like that , at the top and front I presume .

 

[[2068]]

Surely a large outboard manufacturer wouldn't build an engine with the potential to let water up the exhaust ?
Where is the air intake on a motor like that , at the top and front I presume .

Yamaha have been replacing powerheads under warranty for this, and there is a preventative ECU update for some models.
It's water up the exhaust, not the intake.