[tharbert]

Nice car!

If you use the search function on "Carrera tensioner", you will find A LOT of discussion about the pros and cons. I personally landed on the side of using the oil fed tensioner but have rebuilt and set aside the old failed mechanical tensioner removed from my car.

The collars do nothing more than provide a little safety during the time the mechanicals are failing. In my case, the P.O. installed the collars. The tensioners were so bad, one of the collars broke and went into the sump screen. I would look closely at your collars. If the faces are scored or scratched like they have made significant, repeated contact with the tensioner body, consider rebuilding the mechanicals or upgrading to the oil fed units.

Yes, Carrera tensioner are expensive but, IMHO, worth it. The collars are next to useless. Also, look at replacing the chain ramps. Ramps are cheap and easy especially while you have the engine out. You could probably assign their installation to the assistant.