What mileage did you change serpentine belt?

Pr335bob · 06-28-2014, 12:47 PM

Curious because I'm at 68k and the belt feels strong. Just wanted to do it as a.preventive measure. What else to buy while replacing ? Can't find a diy on e90post.

Thanks

JC335xi · 06-28-2014, 01:15 PM

Quote:

Originally Posted by Pr335bob

Curious because I'm at 68k and the belt feels strong. Just wanted to do it as a.preventive measure. What else to buy while replacing ? Can't find a diy on e90post.

Thanks

Mine just came in the mail today actually. I am just shy of 80k and I plan on doing the job next weekend along with the water pump and thermostat. I got the kit including the idler pulleys and tensioner from ECS http://www.ecstuning.com/BMW-E90-335...elt/ES2581868/

DIY here: http://www.pelicanparts.com/BMW/tech...eplacement.htm

Pr335bob · 06-28-2014, 02:05 PM

Thanks! That is an awesome diy! I'm going to hold off on the water pump. But definitely am going to get the belt and the idler pulley.
Again thanks !

Pr335bob · 06-28-2014, 02:08 PM

Is the idler pulley the one that tensions the belt?

Wes335XI · 06-28-2014, 05:06 PM

Did it while I had the new turbos put in. I'm at 52K.

Transport3r · 06-28-2014, 05:11 PM

I did the belt, both idler pulleys and the tensioner at 82K. ECS sells a kit for $140ish

LI_Goalie · 06-28-2014, 06:46 PM

I have the maintenance package on my cpo car. What mileage will the dealer replace it at? Mine squeaks on cold starts.

gtaccord · 06-28-2014, 07:38 PM

I did mine around 70k. Did belt, tensioner and idler pulleys. Really it was a waste. The belt was in perfect shape.

06-28-2014, 10:04 PM

Quote:

Originally Posted by gtaccord

I did mine around 70k. Did belt, tensioner and idler pulleys. Really it was a waste. The belt was in perfect shape.

Yeah, I did all that as well around 56k miles. Everything was in really good shape...it was one of those "while I'm in there anyway" kinda maintenance items for me though.

135Pats · 06-28-2014, 10:06 PM

58K. Belt looks fine but it's one less thing I have to worry about.

Transport3r · 06-29-2014, 06:15 AM

agreed with everyone above, it's one less thing to worry about, i was tearing the whole thing apart for the VCG, OFHG, vacuum line replacement and valve cleaning anyway.

flexinator · 06-29-2014, 06:29 AM

Anyone wanna post a quick DIY? I figure is just take out the radiator fan, snap a pic then replace things with new parts. Any details I'm missing?? Torque specs maybe?

Wes335XI · 06-29-2014, 08:34 AM

I had mine replaced twice. 20K was warranty, thing was squeaking really bad. The one at 50K was just a "while you're in there" but there were chirps every now and then. I'm sure the other parts (tensioner, idler pulley, etc.) are just fine.

C.Pop · 06-29-2014, 08:53 AM

Did mine, pulleys, etc at 85k or so. It's very inexpensive and there were several guys who broke a belt (I think all were the '07 models that the belt was very close to the subframe) and in doing so trashed the engine. To be clear, breaking the belt doesn't trash the engine, but in a couple of cases it got wrapped around the crank pulley and sucked in the main seal. As unlikely as that sounds, it's been reported several times by reputable guys. Regardless, my tensioner was not working properly so I changed all that jazz out. Pretty quick & easy. The belt inspected fine afterwards, but the tensioner was shot.

Transport3r · 06-29-2014, 09:16 AM

The biggest problem with the belt is that the PS pulley hits the subframe when the motor mounts get weak. There have also been some cases of broken tensioners too though.

When the belt goes it has a pretty high probability of getting wrapped around the crank pulley and then being forced through the crank seal. This will destroy he motor if you don't turn it off quickly, because pieces of shredded belt will be pumped around the motor.

Miller335 · 06-29-2014, 10:14 AM

Quote:

Originally Posted by flexinator

Anyone wanna post a quick DIY? I figure is just take out the radiator fan, snap a pic then replace things with new parts. Any details I'm missing?? Torque specs maybe?

Yes rad fan needs to come out on an n54, don't forget you'll need a T60 to remove the tension off the belt.

TheeGovernor · 06-29-2014, 12:30 PM

115k I havent touched it. I do a lot of track days too.

scflaw · 06-29-2014, 01:11 PM

110k but mechanic said the belt was turning white and the sides were fraying. Also replaced the idler pulley, less noise coming from the engine bay now.

Pr335bob · 06-29-2014, 01:15 PM

Quote:

Originally Posted by Transport3r

I did the belt, both idler pulleys and the tensioner at 82K. ECS sells a kit for $140ish

That's good I'm going to search for that sounds like a good deal.
Thank you everyone.

Pr335bob · 06-29-2014, 06:03 PM

I was thinking, while I'm at it I should do the intake manifold cleaning/ walnut blasting. I don't have the tools but I figure I can clean with a wire brush maybe? Seeing as I'm going to have clearance to move the bolt that open and closes so I can clean without worrying about prices going into the motor. My main question is can I open and close without the belt being on?

JC335xi · 07-03-2014, 11:38 PM

Just some food for thought. I just started taking everything apart tonight and discovered that I am yet another person with a smashed power steering pulley...

There is no clear indication of what it impacted but luckily for me the belt is completely undamaged and actually looks to be in very good shape.

z19930612 · 07-04-2014, 05:40 AM

Don't do it until it makes noise...

06-28-2014, 12:47 PM	#1
Pr335bob Captain 38 Rep 753 Posts Drives: Black on black e92 Join Date: Oct 2011 Location: Puerto Rico USA iTrader: (0)	What mileage did you change serpentine belt? Curious because I'm at 68k and the belt feels strong. Just wanted to do it as a.preventive measure. What else to buy while replacing ? Can't find a diy on e90post. Thanks
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06-28-2014, 02:05 PM	#3
Pr335bob Captain 38 Rep 753 Posts Drives: Black on black e92 Join Date: Oct 2011 Location: Puerto Rico USA iTrader: (0)	Thanks! That is an awesome diy! I'm going to hold off on the water pump. But definitely am going to get the belt and the idler pulley. Again thanks !
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06-28-2014, 02:08 PM	#4
Pr335bob Captain 38 Rep 753 Posts Drives: Black on black e92 Join Date: Oct 2011 Location: Puerto Rico USA iTrader: (0)	Is the idler pulley the one that tensions the belt? Last edited by Pr335bob; 06-28-2014 at 02:21 PM..
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06-28-2014, 05:06 PM	#5
Wes335XI Lieutenant 107 Rep 400 Posts Drives: 2008 335XI Space Grey Join Date: Sep 2011 Location: Anchorage, AK iTrader: (0)	Did it while I had the new turbos put in. I'm at 52K. __________________ 08 E92 335XI - Space Grey/Coral Red 11.80 @ 118.95mph - 470AWHP 2013 BMW 335XI MSport Alpine White/Venetian Beige 2018 WRX STi TypeRA 2022 X5 MSport Alpine White/Tartufo Merino - Inbound
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06-28-2014, 05:11 PM	#6
Transport3r Major 86 Rep 1,262 Posts Drives: 2011 N55 E90 Join Date: Sep 2010 Location: Melbourne, FL iTrader: (4)	I did the belt, both idler pulleys and the tensioner at 82K. ECS sells a kit for $140ish
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06-28-2014, 06:46 PM	#7
LI_Goalie Private First Class 7 Rep 110 Posts Drives: 2009 335xi E92 6MT Join Date: Dec 2013 Location: Long Island, NY iTrader: (0)	I have the maintenance package on my cpo car. What mileage will the dealer replace it at? Mine squeaks on cold starts.
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06-28-2014, 07:38 PM	#8
gtaccord Major 56 Rep 1,464 Posts Drives: 2009 BMW 335xi Join Date: Feb 2012 Location: Maryland iTrader: (7) Garage List 2009 BMW 335i xdrive [0.00]	I did mine around 70k. Did belt, tensioner and idler pulleys. Really it was a waste. The belt was in perfect shape.
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06-28-2014, 10:06 PM	#10
135Pats Major General 456 Rep 6,478 Posts Drives: A few BMWs Join Date: May 2012 Location: Maryland iTrader: (3)	58K. Belt looks fine but it's one less thing I have to worry about. __________________ E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP F30 N55 XDrive EBII
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06-29-2014, 06:15 AM	#11
Transport3r Major 86 Rep 1,262 Posts Drives: 2011 N55 E90 Join Date: Sep 2010 Location: Melbourne, FL iTrader: (4)	agreed with everyone above, it's one less thing to worry about, i was tearing the whole thing apart for the VCG, OFHG, vacuum line replacement and valve cleaning anyway. __________________ Josh-
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06-29-2014, 06:29 AM	#12
flexinator Captain 86 Rep 639 Posts Drives: 2011 335xi coupe Join Date: Oct 2007 Location: US iTrader: (2) Garage List 2008 335xi [0.00]	Anyone wanna post a quick DIY? I figure is just take out the radiator fan, snap a pic then replace things with new parts. Any details I'm missing?? Torque specs maybe?
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06-29-2014, 08:34 AM	#13
Wes335XI Lieutenant 107 Rep 400 Posts Drives: 2008 335XI Space Grey Join Date: Sep 2011 Location: Anchorage, AK iTrader: (0)	I had mine replaced twice. 20K was warranty, thing was squeaking really bad. The one at 50K was just a "while you're in there" but there were chirps every now and then. I'm sure the other parts (tensioner, idler pulley, etc.) are just fine. __________________ 08 E92 335XI - Space Grey/Coral Red 11.80 @ 118.95mph - 470AWHP 2013 BMW 335XI MSport Alpine White/Venetian Beige 2018 WRX STi TypeRA 2022 X5 MSport Alpine White/Tartufo Merino - Inbound
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06-29-2014, 08:53 AM	#14
C.Pop First Lieutenant 65 Rep 385 Posts Drives: 335i Join Date: May 2013 Location: AZ iTrader: (0)	Did mine, pulleys, etc at 85k or so. It's very inexpensive and there were several guys who broke a belt (I think all were the '07 models that the belt was very close to the subframe) and in doing so trashed the engine. To be clear, breaking the belt doesn't trash the engine, but in a couple of cases it got wrapped around the crank pulley and sucked in the main seal. As unlikely as that sounds, it's been reported several times by reputable guys. Regardless, my tensioner was not working properly so I changed all that jazz out. Pretty quick & easy. The belt inspected fine afterwards, but the tensioner was shot. __________________ 2007 E90, 6MT, VRSF 7" FMIC, RR DP's, Vargas Stage 2+ (19t unclipped), CP-e Charge Pipe/Tial BOV, BMS DCI, Fuel-it! Stg 2 LPFP, E66, 118k+ miles Brentuned
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06-29-2014, 09:16 AM	#15
Transport3r Major 86 Rep 1,262 Posts Drives: 2011 N55 E90 Join Date: Sep 2010 Location: Melbourne, FL iTrader: (4)	The biggest problem with the belt is that the PS pulley hits the subframe when the motor mounts get weak. There have also been some cases of broken tensioners too though. When the belt goes it has a pretty high probability of getting wrapped around the crank pulley and then being forced through the crank seal. This will destroy he motor if you don't turn it off quickly, because pieces of shredded belt will be pumped around the motor. __________________ Josh-
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06-29-2014, 12:30 PM	#17
TheeGovernor Life is better with burnouts 97 Rep 611 Posts Drives: BMW Join Date: Dec 2011 Location: Mile High iTrader: (4) Garage List 1996 Toyota Forklift [0.00] 2007 BMW 335i [0.00]	115k I havent touched it. I do a lot of track days too.
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06-29-2014, 01:11 PM	#18
scflaw Captain 208 Rep 741 Posts Drives: M135I, Macan S, G26 i4M50 Join Date: Jan 2011 Location: HKG iTrader: (1)	110k but mechanic said the belt was turning white and the sides were fraying. Also replaced the idler pulley, less noise coming from the engine bay now.
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06-29-2014, 06:03 PM	#20
Pr335bob Captain 38 Rep 753 Posts Drives: Black on black e92 Join Date: Oct 2011 Location: Puerto Rico USA iTrader: (0)	I was thinking, while I'm at it I should do the intake manifold cleaning/ walnut blasting. I don't have the tools but I figure I can clean with a wire brush maybe? Seeing as I'm going to have clearance to move the bolt that open and closes so I can clean without worrying about prices going into the motor. My main question is can I open and close without the belt being on?
	Appreciate 0 Quote

07-03-2014, 11:38 PM	#21
JC335xi Second Lieutenant 19 Rep 259 Posts Drives: 07 e90 335xi Join Date: Mar 2011 Location: CT iTrader: (2)	Just some food for thought. I just started taking everything apart tonight and discovered that I am yet another person with a smashed power steering pulley... There is no clear indication of what it impacted but luckily for me the belt is completely undamaged and actually looks to be in very good shape. __________________ 2007 335xi 6AT \| Cobb Stage1+ \| BMS DCI \| VRSF 7" IC \| FA 500 400#F/600#R \| ARC8 17x9 et30 \| RE-11a 255/40/17 Parting out car. For sale thread here: http://www.e90post.com/forums/showthread.php?t=1167583
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07-04-2014, 05:40 AM	#22
z19930612 Lieutenant 129 Rep 483 Posts Drives: 1 Series M Coupe Join Date: Feb 2013 Location: Shanghai iTrader: (0)	Don't do it until it makes noise...
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