"Dave
Pull the plugs, squirt
"Dave
Pull the plugs, squirt in oil in all clyinders then let stand for a day or so try and roll it over with plugs out. If no can do, put oil in again with small amount of diesel fuel, the diesel cuts rust and can free the engine. If this is due to non use and rust this will work, if its thrown a rod, will not help. When you go to spin it over leave plugs out, lay a rag over plug holes so you do not blow oil all over. Used this method alot on engines, I use a 4 D battery with a 75 amp charger hooked to it. One must be careful and have extingisher near by."