Audi Repair Questions? Ask a Mechanic for Answers ASAP
Hello, I'm Brandon.
The crankshaft sprocket is suppose to be round not elliptical. Your sprocket is bad.
Please rate me positive thank you.
The timing chain tensioner can failed and cause damaged to the sprocket by the chain.
For the belt engine one I'm not sure how it became elliptical.
I will open up this question to other tech. Maybe they will have an answer for you.
I will opt out for now.