Dirt in spark plug tube well?
 

Finishing up replacing my spark plug tubes today and I noticed that there was dirt in one of the wells (with the tube removed). When I pulled the tube, there was a considerable amount of dirt on both the green and red o-rings. What concerns me is the dirt around the green o-ring. I peeked inside the well and sure enough, there is debris around that area. Is this cause for concern? I tried to snap a pic of the well and you can see the dirt hanging around the area that the green o-ring would sit at.

http://img.photobucket.com/albums/v1...che/debris.jpg

Dirt shouldn't get in there but if your timing chain tensioner wear pads are wearing excessively it could leave little hard plastic/nylon particles to float around. Cut open your oil filter & see if you have anything there. If the "dirt" is rubbery it's probably gasket sealant.

it looks like small amounts of dirt/soil. maybe the previous owner installed dirty o-rings? only 1 tube has this issue. the other ones were clean.