40-45k Serpentine belt breaks, common issue

007_e350 · 07-28-2015, 01:16 PM

hey folks, anyone noticed this ? A lot of ppl have reported this on the X5, is there a reason for this anyone can relate to ?

dr_dirtg · 07-28-2015, 01:22 PM

I have 165km (100,000 miles) on my belt (335d), and it still looks good, no cracks.

e46mpwr · 08-09-2015, 01:31 PM

My belt didn't break, but the crankshaft pulley the belt goes around broke. Had to get the pulley and belt replaced. Car had just over 100K miles when it happened.

fsd350 · 08-10-2015, 06:57 PM

Quote:

Originally Posted by dr_dirtg

I have 165km (100,000 miles) on my belt (335d), and it still looks good, no cracks.

It is important to note that today's EPDM rubber belts do not usually fail in the same way as neoprene belts have in the past. Material loss (rib depth) is a better indicator. You can buy a plastic belt depth gauge pretty cheap. I'm in the parts biz and learned this from my old Gates rep. Here's a good link explaining the difference:

http://www.gates.com/products/automo...-vs-epdm-belts

07-28-2015, 01:16 PM	#1
007_e350 Lieutenant Colonel 217 Rep 1,909 Posts Drives: 335i 2008 MHD'd / x5d E70 Join Date: May 2013 Location: left lane iTrader: (3)	40-45k Serpentine belt breaks, common issue hey folks, anyone noticed this ? A lot of ppl have reported this on the X5, is there a reason for this anyone can relate to ? __________________ Mods: 7" VRSF FMIC, Forge DVs, RB PCV, BMS Oil Cooler, VRSF DPs, MHD, JB4g5, OFT DIYs: Walnut blasting : Trans Oil at 45k, w Filter at 65k : Diff Oil Flush @ 45k : WP&TS @ 69k : Alternator @ 79k --- E70d Alphabet Soup del 44.4k : JR Stg2.25 tune : Buzzken Catted Exhaust : Trans fluid drain/ fill (3 Qrts), both Diffs fluids flushed Wheels: Style 95s on PSSs (Sold): AG 359s on S04s : 162s on Blizzaks : Rohana RF1 Matt black
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07-28-2015, 01:22 PM	#2
dr_dirtg Private First Class 39 Rep 167 Posts Drives: 335d Join Date: Jul 2013 Location: Canada iTrader: (0)	I have 165km (100,000 miles) on my belt (335d), and it still looks good, no cracks.
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08-09-2015, 01:31 PM	#3
e46mpwr Private First Class 13 Rep 104 Posts Drives: '10 335d, '20 X3M Join Date: Apr 2009 Location: Los Angeles, CA iTrader: (1) Garage List 2020 BMW X3M [0.00] 2017 BMW i3 [0.00] 2019 BMW i3s [0.00] 2018 BMW 330e [0.00] 2001 BMW 330i [0.00] 2010 BMW 335d [0.00]	My belt didn't break, but the crankshaft pulley the belt goes around broke. Had to get the pulley and belt replaced. Car had just over 100K miles when it happened. __________________ '01 330i, '10 335d, '18 330e, '19 i3s, '20 X3M Gone '02 M3, '09 535i, '14 i3, '17 i3
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