Hi I have got a perkins 4.236 diesel engine with LD start number which I believe was mainly used in massey ferguson tractors and other plant. I want to turn the engine over by hand to see if it is seized or not and was wondering does anybody know what size socket I need to turn the crankshaft over. I've read somewhere that people have tried to turn it over using the flywheel and pry bar but this could cause damage. Any suggestions please.