Quote:
Originally Posted by BioPOWER
Mercedes doesn't even include a reamer in the WIS instructions for replacing glow plugs.
The process is, in a nutshell, remove intake, remove glow plug, install new glow plug, reinstall intake. DUH! 
There is, however, a special "Glow Plug Repair Set" for "removing broken off glow plugs out of cylinder head as well as thread repair," part#: 611 589 00 99 00.
Includes about 20 various bits, taps, depth stops, thread cutter...."Special Order, Price on Request" from Samstag Sales. |
Yes, I have heard that some dealers have them, some people have claimed that they have been able to succesfully drill out broken plugs and retapped the threads while others claim they have had to have the heads pulled so the stubs could be removed at a machine shop. It's all the luck of the draw.
That's why I said I think a good tip is to work on a hot engine, shut it down and as fast as you can remove the intake and start pulling out those GPs. If you're lucky, like me, you'll get them all out without breaking one.
I've heard it is the carbon built up around the tips that causes them to stick in the holes not the threads being seized so the reaming is recommended to prevent that and also open up a hole for the new plugs to work well and last long. The anti-seize is just extra insurance to help the threads from stikcing the next time you have to change them.