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Old 12-22-2009, 09:11 PM
flat6fan flat6fan is offline
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Location: South
Join Date: May 2005
Posts: 28
Mein Auto: 01 330i
Originally Posted by johnnygraphic View Post
Any way to tell if you have the mechanical or hydraulic tensioner pulley?


I am revisiting this thread since my thermostat appears to have failed. I am considering replacing the tensioner since it was not done during the previous overhaul. It appears that autohausaz is now selling an upgrade kit to go from mechanical to hydraulic. I would guess that after a certain build date the tensioners were all hydraulic. My car is a mid 2000 build.

You can search the autohausaz website to see a picture of each type of tensioner.

Also plan to install the lower hose by replacing only the O-ring (part# on the temp sensor.