Can i say that the chipped gear pueces are somewhere down in the oil pan? I can only imagin it sinking down but who knows what else it may have crunched up along the way. The cam gear shouldnt be too hard to change given most cam gears have very few bolts. It's not hard to figure out. Just take a look to the side of the cam, get tool, switch it out and bam, its done! (make sure your timing is right though lol.