The visual difference for upgraded chain tensioners?

[davewadd]

If you're looking at a 911 motor, how can you visually determine if the car has upgraded chain tensioners?... What are the visual indicators?
Trying to learn something new.

[ZombieBranz]

I upgraded mine not too long ago to the pressure fed tensioners.

There are two types of upgraded tensioners. The first is a tensioner with a collar on it that prevents the chain from going to full slack if a tensioner goes bad. You would not be able to tell visually from the outside whether a 911 has these...you would have to take off the cam chain/tensioner cover plate and look to see if there is a metal collar around the top of the tensioners.

The second kind are the carrera pressure fed tensioners. These are a very popular upgrade and yes you can visually tell from the outside. These tensioners are pressure fed via add'l oil lines that are routed directly thru each chain tensioner cover and into each tensioner. Thus, this upgrade requires cam chain/tensioner covers that each have a hole that allows an oil line to go into the tensioner. So basically on these you can look from the top of the engine and see if there are add'l stainless oil lines running directly down and then into both the left and right cam chain/tensioner covers.

I'm fairly new so I'll not be surprised if others can expand/correct on what I've said.

[ZombieBranz]

Here is a good clear pic showing the add'l oil line coming down and into the cover for a pressure fed carrera tensioner setup.

[kentf14]

As always Grady had all the answers
http://www.early911sregistry.org/for...tensioner-kits

3rd option "(no external plumbing) ‘Turbo’ tensioner (narrow support) rebuilt with new parts and with the Jerry Woods travel-limiting mod"

[davewadd]

Excellent! Thank you.

[raspy2point2]

one important thing is to have the wider idler arms with the bronze bushings so the arm no longer galls the post it sits on. chris