I had a GP7 Legacy diesel exhibit sudden runaway speed and after some forum research it seems that the most likely candidate is a loose or missing flywheel set screw. With the top access panel off, I can see the threaded whole where the set screw is or should be but certainly can't see a screw no matter how hard I look. Tried taking the shell off for a closer look but quickly lost that battle. Does anyone know what the screw is? Is it allen key?
Thanks.