Re: Volvo 130 Seized+Milkshake
That depends. Alumnum pistons, steel components, and cast iron blocks don't mix with water. They create an internal battery of sorts when wet and the corrosion of both starts almost immediately. Salt water is worse than fresh. Warm temperatures are worse than cold (warm temps speed up the chemical reaction). Time is your real enemy.
Only way to know for sure is to pull the engine (the quicker you do this, the better your chances for a rebuild)
The engine block will need to be bored IF you can get the pistons out. Not familiar with that engine, but the depth of the cylinder wall corrosion may exceed the max recommended overbore. If so, throw the block away.
If the oil looks like a milkshake, its likely the crank is pitted on its journals. Again, if the pitting is minor, you can get away with grinding the crank.
If its really seized, finding another motor may be cheaper and easier in the long run. If its only recently happened, you may skate by with a rebuild.
So, it depends.
Want to see how bad it can be? See attached pix. This motor was wet for about a year. Its all just junk now.