Thanks for the advice, its good to know I am on the right track. I only have an L shaped set of allen wrenches, so I'll probably be getting one of those 1/4" drive hex sockets real soon. I was planning on tweaking the alda while I was in there since it is REALLY sluggish off the line (good top end though).

By the way, the previous owner kept impeccable records and there was no mention of the glow plugs ever being replaced. Not bad if a set of glow plugs can last 14 years and 200k miles.