Frozen V-8 OMC GM engine

[lordnarvinye]

hullo all,

Have a v-8 gm engine that won't turn over.  Drive is not attached, spark plugs are out.

It turned over fine about six months ago, then I had some parts to replace, so i pulled it....and now it's six months later :P

I've read to soak the cylinder heads in PB, but my plugs are on the bottom, so i am unsure how to do this.

any ideas?

[slippery73]

What plugs are on the bottom? I would say spray corrosion block into each cylinder through your spark plug opening and let it sit for a while, then try it. You may need to put a breaker bar and a long pipe on your flywheel after its soaked for a while to free things up. Have the plugs been out this whole time? If not you probably have had a leaking head gasket, allowing either coolant or saltwater into your combustion chamber. In small amounts it burns off when the engine is running because of the heat, but if it sits for extended periods of time it will make a mess of things. You will want to check things out before putting it back into action, as a motor shouldn't seize just from sitting unless something is wrong.

[lordnarvinye]

the spark plugs are on the bottom.  or at least angled in from the sides.  No, the plugs have been in the whole time.  
I know when working on it a while ago, we managed to flood it pretty badly with gasoline while timing it.  I realize now, it would have been a good idea to turn the fuel line off.  Could this have caused corrosion?

[slippery73]

Any fuel in the cylinders would be a good thing, should keep things lubed. You will need to spray some kind of antiseize into each cylinder and let it sit for a day or so. Marvel mystery oil works well. Then you will want to see if it will turn by putting a wrench on the flywheel nut and trying to turn it over, it will turn easier if the plugs are out. Worst comes to worst if that doesn't break it lose wou will want to pull your cylinder heads and inspect to see whats got them seized. You should be able to see where any coolant leaks are making there way into the cylinders.