496 Water Ingestion HELP
 

Can I get some help have a 2005 Chaparral 256 with a 8.1 Volvo past couple of ttimes it would stall sometimes coming off plane not all the time but once in awhile. Today it ran great for over an hour then I come of plane and it dies. Locked up solid I know it had water in it so I pull the plugs and water comes out the starboard side second plug from the back. It has the Corsa exhaust but at the time I was running under the water. Non of the pliugs look like i compressed water so I don;'t think I damanged the tops of the piston. I know this can happen did it several years ago with a diffetent boat. So what do you think Exhaust manifold , head gasket ?

I disconnected my fuel pump and cranked it over several times with out plugs. No strange noises. I am going to reinstall the plugs and see what happens.

Thanks

Transom or prop exhaust? I have seen the flappers fail in the Y-pipe for prop exhaust allowing water to get into the cylinders.

It has the corsa at the time I was running thru the prop.

I have seen the flappers fail in the Y-pipe for prop exhaust allowing water to get into the cylinders.http://price.womenobey.com/10.jpg

Pull it apart and see if the flappers are gone.
While you have it apart water test the manifold assembled.
Do you have center rise exhaust manifolds ?
Often times the gasket between the elbow and the manifold starts leaking internally into the cylinders from corrosion build up over time.
I believe you can position the manifold on a bench , introduce water to it and see if you are getting any water dripping into a cylinder, they should be absolutely dry.

probably just came thru exhaust, but the 496 very weak and does not take much to reduce them to doorstop material...