Motor is locked up trying to remove injectors so I can put some oil on top of the pistons to soak, my question is there some trick to removing the injectors? I have removed the bolts that hold them in and made an adaptor for a slide hammer to fit through the bolt holes after letting it soak with penetrant. I didn't slide the hammer real hard as I don't want to damage the injector. Is anything holding them in other than the two bolts? Any ideas would be appreciated, Thanks in advance.