To loosen the nuts on the injectors and the Injection Pump, I use a
17mm flair nut crows foot wrench. using a straight 17mm open end
wrench doesn`t always fit or have the space to swing or turn.
I have replaced the plugs w/o removing the fuel lines.
I agree on the gear wrench. these things are real handy.
Use a little anti siez on the threads of the glow plug when installing.
when installing the wires and nuts, do not over tighten. If you drop one
of the little nuts, you will never find it. I have no idea where they go.
Charlie