Alright so here is my situation, the other day i replace all 8 glow plugs in my 1986 F-250 With a 6.9 IDI diesel and when i started it up again there was a ticking sound coming from the engine. I was told that it could be a piece of one of the old glow plugs in the cylinder. I drove it around and the sound got a little quieter particularly when it is at an idle. I also topped off the oil which was less than a quart low and it got a little quieter again. Does anybody have any idea what it could be and how i could fix it?