BLK6RL,
Hi I have the 1260 also and I have the book.
I looked up the removal of the glow plugs in my book. Not much there. It reads as follows.
"Removal
Remove the connector by loosening the glow plug nut installed on the cylinder head.
Remove the glow plug.
Inspection
Check for continuity across the sheath and center electrode. if there is no resistance, it indicates a short circuit, so replace the glow plug. If the resistance is infinite, it shows that pre-heating coil is burnt out, so replace the glow plug.
Re-installation
Install the glow plug
Install the nut on the glow plug and connect the connector."
Standard value 2.0 OHMS
This is as written in the book. I hope it helps the book doesn't cover the removal of all the other stuff in the way.
Good luck
Phil