Belt tensioner help

[dabomb4ever]

Originally Posted by tmv

Look like you have hydraulic tensioner from the picture. The mechanical tensioner will have a 15mm hex on the housing. You have hydraulic tensioner if you dont see that bolt.
BMW E53 X5 M54 3.0L > ES#2187565 Mechanical Belt Tensioner Assembly - 11281427252
I have mechanical ones on both my BMWs so I can't comment on your empty bolt thread. How many miles on your X5 when the belt snapped?

My thought exactly, and i can see that little black bushing ring behind the pulley which looks to be on the ends of the hydraulic cylinder.

I have 70K miles on it, but I just replaced the serpentine 6 months ago (oem manufacturer but not oem) when i did the thermostat and water pump. I had a 2-3K miles on it which made me think it wasn't incorrect install or it would have failed much sooner. Just in case I was going to replace the pulleys this time.