Quote:
Originally Posted by Raulporkuu
dump a bunch of oil in it get a breaker bar and roll it over by hand it should free up and run might run like sh&*, might have a bearing knock but running none the less.....  |
Depends on what happened. Two common reasons for an engine to seize are 1) low oil pressure so a bearing welds to the crankshaft
2) a piston seizes in a bore
Either way it is unlikely you will be able to turn the engine even with a breaker bar.
The following shows the process of fixing a seized V6 engine from a Mustang
swalch - Photobucket - Video and Image Hosting
I had to loosen all the bearing caps then the engine would turn and could be disassembled. The main damage was a spun rod bearing that had welded to the crank. The engine was totally salvageable but the welded bearing shell had to be removed with careful use of a hammer and chisel, then the crank was ground 10/10.
The rod with the spun bearing had gotten very hot which also overheated that piston and scuffed the bore, so the engine also needed a rebore and new pistons.
An additional issue on an overhead cam engine is the condition of the cam bearings. If the damage is minor they can be repaired by align honing.