Has the heaters be split inside the threaded hole? Or what has been broken has been the tip of the heater and has remained inside the cylinder head and cylinder?
In the first case, it is a fairly difficult work, especially if we talk about the 3rd or 4th cylinder because they are practically under the dashboard. This work requires drilling with a fine drill in the center of the heater and inserting a broken asparagus extractor. It goes without saying that the drill must go as centered as possible so as not to touch the thread threads (and you will tell me the hole you have to do anything in). The tool in question is a square piece of steel that gets in a blow and turns with a groin. If you do not have this useful, you can try a torx tip stuck in the hole you have made.
Anyway, this would be useful if we talk about the first, or at most of the second, but do not discard that you have to remove the cylinder head and take it to a rectifier to get you \ "the pearl \".
In the second case, (incandescent tip inside the butt) Sometimes it is enough to put a magnet or a wire and blow with the open intake valve to remove it.
Do not think of turning the engine with the start because you will get the tip to be in the piston or the cylinder head. Sometimes, by this same breakdown, it has also had to get the cylinder head to rescue the broken tip of the heater.
Something similar happened to me with a Vito 111 CDI, but it was not a heater, but an injector flange, (the 3rd) that passed the thread and the cylinder began to escape gases and shit through the injector seat. You do not imagine what had to be lined only to remove the injector, and of course, the cylinder head had to be removed.
Greetings and encouragement that goes putadita ...
