Hi - I've done exactly this job on a phase III deisel Espace (model JE0E Engine G8T) it looks more scary than it is... though it is quite fiddly! Access is VERY tight as you will have seen. You'll need a 1/4 inch Universal joint and a 3/8 and 1/4 sockets. Undo 8mm? nut and remove the wire to the glowplug (1/4 socket and UJ) then use a deep 10mm socket (I that to cut the one I used down a little) and a UJ (I used a 3/8 to 1/4 inch adapter then the 1/4 inch UJ again and remove the glowplug. Put a little copper-slip on the new ones and don't overtighten! refitting the wire and nut is fiddly. Be VERY careful not to drop anything small- like the 8mm nut, into the head. It will always be in your mind that, if anything does go wrong and the head, or manifold, needs to come off- then the engine has to be removed from the Car first!! Not rocket-science, just tale care. A small magnet is handy for fishing out the 8mm nuts AWJ99@yahoo.com
Andy, February 2009