Originally Posted by dubrus
If the seller never noticed that then that tells you all you need to know about the service history.
Without knowing full details and benefit of doubt, perhaps they bought it with a boat and didn't need the yam so sold it in good faith?
Either way, the engine is an economical write off unless you get a cheap mid and do the work yourself. Taking a power head off an engine of that age may have other issues (bolts snapping). I assume you bought this on eBay so you generally pay market value, just send it back. Do not even contemplate anything else, be other motors about.
Engine has been on the same RIB since the early 90's and I purchased it without even viewing it in person. I know, I'm really p!ssing into the wind here.
The seller says he has been unaware of any damage after having owned it for 18 months and having used it very recently. I noticed the damage within 5 minutes of trimming the engine down. However, there does seem a chance that we can come to some sort of arrangement. Sending it back isn't an option as it was trailered up to me by quite some distance. There is the suggestion that the damage was caused, or at very least made worse by the road journey yesterday, but as per the photo, the sealing gasket has been forced through the gap some time ago and has moss and cracking on it. I'm no expert, but this literally hasn't just happened.
I'm willing to take a hit on this, I've really no other choice, but as others have alluded to, this might not be all that is wrong with the engine.