my idea if it doesn't crank is maybe stuck at "top dead center"...do you know what that is?...if not..."tdc" is when the piston is stuck at the top of the head and wont move...to fix this, take out your glow plug and try to start it... if the piston moves, then your problem is else where but if it doesnt, give it a 1 sec burst of wd40 and that might do the trick