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#1
06-22-2012, 10:47 AM
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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?
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 00 E39 DINAN S1 //M5 (82k miles) 06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html 90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq 01 360 Novitec Spider F1 (26k miles) Last edited by tmv; 06-22-2012 at 11:00 AM. 
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#2
06-22-2012, 01:39 PM
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Quote:
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.
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#3
06-22-2012, 03:39 PM
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Quote:
__________________
00 E39 DINAN S1 //M5 (82k miles) 06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html 90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq 01 360 Novitec Spider F1 (26k miles)
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