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      09-17-2012, 10:10 AM   #1
pyoung62
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Serpentine Belt Replacement

I'm at 50k on my '08 135i and ready to replace the serpentine belt (not showing any significant wear, but being proactive with my maintenance). My questions are this:
Is this the only belt or is there an AC belt as well (car's at home so I can't look at it)? Realoem doesn't appear to show a second belt and the routing appears to show the compressor in the serpentine belt routing.
Should I plan to replace the tensioner and both idler pulley's as well? I've never proactively replaced them on other vehicles I've owned, but found some youtube videos that show how to replace all at once. Not sure if that's the recommended practice or the video just being a comprehensive DIY.
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      09-17-2012, 02:57 PM   #2
F80_M3llow
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Yes there is only one serpentine belt that drives all the pulleys. I have a n52 diy if you check on my posts. The idle pulley should be checked. I spin it and if it spins freely and sounds like there is sand grinding in there then replace. I I would do everything in one shot.
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      01-07-2016, 02:27 AM   #3
jcoop269
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Quote:
Originally Posted by F80_M3llow View Post
Yes there is only one serpentine belt that drives all the pulleys. I have a n52 diy if you check on my posts. The idle pulley should be checked. I spin it and if it spins freely and sounds like there is sand grinding in there then replace. I I would do everything in one shot.
Do you think you could provide me a link to your n52 DIY? That would be greatly appreciated...I am at 100,000 miles and although the belt still seems to be perfect, for $180.00 from Tischer for the entire kit, it needs to be part of my overall "lifetime" rating maintenance schedule which included tranny fluid/filter, coolant, water pump/therm., power steering fluid/filter/reservoir replacement.
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