The earlier thread reminded me of an incident where we had a gearbox go bang and were towed back at 10(ish)knots for about 7 miles. The boat was then slipped, but did not go in for repair until a few months later. When it was checked the powerhead had seized as a result of water going up the exhaust whilst under tow.
Now, it was not my boat so I did not really have anything to do with the maintenance side, but I remember much moaning and griping about being stitched up at the time.
I don't actually know if this was the case (it certainly was a large repair bill) but it seemed a distinctly plausible possibility to me.
So, is it best to leave the engine up or down if being towed?
Just curious really...
PS. in case it is relevant, it was a 115hp v6 2/stk Yamaha o/board.