Hi, I have a spare one of the above which I am trying to dismantle and am having trouble trying to remove the fuel pump from the engine. Have released the three main retaining bolts but am having difficulty removing timing gear sprocket. Can anybody tell me if it is just being held on by a keyway or do I need a special tool (e.g. hammer!) to remove timing gear sprocket and worm drive for oil pump, to be able to remove the fuel pump. I wasn't sure whether it was seized and just needed a bit of persuasion with a hammer.

Also am having great difficult in finding workshop manual for this engine. Can anybody help with this please.