My66dodge wrote:
Greeting, I own a shop Redline automotive in Richland Wa, the last time I had a tip break off I took out the injector and blew it out with compressed air, that said be sure to replace the injector cruch washer when you put it back. Another trick my buddy uses is to pull the injector and use a shop vac on the injector hole with the piston in the up position and use a punch to knock it in and the suction will remove it, I do not recommend this idea as it is kinda risky.
To make sure I don't break glow plugs I do a BG intake cleaning when the engine is warmed up fully to clean the carbon from the glow plug so it comes out whole, with this method I have only ever broke 2 in my whole career, it's the same way I do the ford 05-08 3v triton 2 piece spark plugs to avoid breaking them and I have done lots but only ever broke one, the other trick in the future is when you are done with the cleaning make sure you pull the plugs when the engine is still hot so the holes are expanded.
IMO Vacuum works better than pressure when extracting anything out of the cylinder. Vacuum will work as long as 1) the piece being removed has a smaller cross section than the hole it's coming out of, and 2) the vacuum source is strong enough to hold the piece coming out to the end of the vacuum hose. (it doesn't need to be sucked through the vacuum tube.)
Pressure CAN work, but it also is just as likely to introduce a variety of abrasive particles along with the air you are blowing in.