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#1
12-01-2013, 04:04 AM
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Abnormal wear AC drive belt -M54
Today I replaced the lower radiator hose sending unit O-ring and looking around the engine bay I noticed the AC belt is showing cracking at the grooves. The other drive belt is just fine. Any reason why the AC belt would be wearing faster? Both are Continental belts purchased new that were installed at the same time. EDIT: pic - 
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04 X5 3.0i auto 03 X5 4.6is Last edited by g300d; 12-01-2013 at 04:07 AM. Reason: Added pic 
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#2
12-01-2013, 07:27 AM
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Oem belt or aftermarket?
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#3
12-02-2013, 12:09 AM
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Could have been an old belt in the parts warehouse. These serpentine belts crack fairly easily is my experience.
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Kirk Las Vegas 2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo 2011 E90M3, 6-speed manual
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#5
12-02-2013, 10:29 AM
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welp at 10 bucks a belt it won't hurt to change it out. is the tensioner original?
I put on new tensioners, idler pulley and 2 continental belts a year ago and all seems fine. the contitech belt is the OE belt for Genuine BMW, just in a continental box instead of BMW box.
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2018 Ram 2500 6.7L Cummins 68RFE 19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed 2013 X5 35D (CEO's) - Born on 5/17/2013 - 82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards
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#6
12-02-2013, 12:09 PM
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Quote:
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#7
12-03-2013, 05:19 AM
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Ricky, yeah the belt is cheap, no prob. I'm just concerned there maybe something I am missing that made it start wearing quicker. The other belt (alternator/water pump) looks to be in much better shape, no cracks at all, and they were both put in at the same time. I believe the tensioners for both belts are the originals, have not replaced either yet.
Upallnight, yes it's not an original BMW marked belt, just made by the OEM.
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04 X5 3.0i auto 03 X5 4.6is
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#8
12-03-2013, 10:22 AM
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That belt looks older than a year to me. I would boil it Down to one of two possibilities; first, as mentioned, it may have been old stock. Secondly, did you use any solvent/degreaser in or around that area to which the rubber may have been exposed?
In either case I'd replace it!
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2004 X5 3.0i Mod list: Currently Longer than the maximum allowed characters that can be typed here... 
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#9
12-04-2013, 05:07 AM
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^surprised the heck outta me too, it looked a few years old already!
Not that I remember, I have a leaking valve cover gasket as you can see in the pics but the oil doesnt reach to there. I've spilled coolant in that area working on the cooling system but I doubt it would cause that. Oh well, guess I'll just replace and see how it goes.
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04 X5 3.0i auto 03 X5 4.6is
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#10
12-04-2013, 05:07 AM
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^surprised the heck outta me too, it looked a few years old already!
Not that I remember, I have a leaking valve cover gasket as you can see in the pics but the oil doesnt reach to there. I've spilled coolant in that area working on the cooling system but I doubt it would cause that. Oh well, guess I'll just replace and see how it goes.
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04 X5 3.0i auto 03 X5 4.6is
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