Installing 911 Carrera
Chain Tensioners

IMHO, the only way to go with tensioners is to update to the pressure-fed "Carrera" type. You can do it with the engine in the car. It took me about six hours, but I'm slow, and I clean/inspect other things "while I'm in there".  Here is the procedure I used:

1. Set cylinder #1 at TDC
2. Drain sump
3. Put rear of car on jackstands
4. Drain oil tank
5. Remove muffler (good idea to soak fasteners with penetrating oil first)
6. Remove oil filter
7. Remove AC compressor (Disconnect the AC clutch power wire, but don't disconnect the AC hoses-just remove the air cleaner and put the compressor on an old towel on the air box, where it will be out of the way)
8. Remove compressor bracket
9. Remove air hoses
10. Remove distributor (note where rotor is pointing so you can put it back in correctly)
11. Remove rear engine tin (covers area above muffler)
12. Remove cam chain covers (you may have to use a putty knife to separate them-be careful not to nick the engine cases)
13. Secure cam chains (use sturdy, soft copper wire, blocks of wood, whatever, just make sure that the chains don't go slack)
14. Remove tensioners (you may have to pry a little-just be careful what you pry against)
15. Install new tensioners (make sure to put the small rubber O-rings on the tensioners where they pass through the covers)
16. Replace cam chain covers
17. Install new oil lines
18. Install oil line braces
19. Replace tin (you will need to cut a little notch to clear the passenger side tensioner oil line-I used a Dremel tool with a cut-off wheel)
20. Reinstall air hoses
21. Reinstall AC bracket and compressor (ensure that the AC clutch power wire is reconnected)
22. Reinstall distributor
23. Replace oil filter
24. Reinstall muffler
25. Lower car
26. Refill oil tank
27. Start engine, check for leaks
28. Treat yourself to your favorite adult beverage--you just saved about $500 labor.

   There is also a good article on this by our esteemed Alan Caldwell in Volume 7, page 57, of Up-Fixin'.