Power steering leak through cap

nkspear · 02-20-2016, 06:43 PM

Just got my 2007 335i back from the shop getting repaired after I was rear ended and noticed a weird burning rubber/plastic smell. Opened the hood to find an overflow/leak through the power steering cap. Is this the reason for the smell? Has anyone had similar experience?

RKP · 02-20-2016, 06:48 PM

I have a similar issue as well, opened the cap and still plenty in there. I have just left it alone until my steering starts to deteriorate.

Sgop335 · 02-20-2016, 06:57 PM

Its a simple o ring fix.

hoopvillian · 02-24-2016, 10:14 AM

http://www.amazon.com/gp/product/B00...rch_detailpage

It might look like there's no Oring on yours because it's compressed. It's there, use a pick to get it off.

Wolf 335 · 02-24-2016, 10:25 AM

Even with a new o-ring you will still have a leak there. It's designed to vent, hence the hole on the cap.

There are solutions to it, but you gotta do a search.

Meeni · 02-28-2016, 11:03 PM

I replaced the oring, and it solved that issue for me. Some of the best $4 I ever spent

nkspear · 03-03-2016, 09:10 AM

Quote:

Originally Posted by Meeni

I replaced the oring, and it solved that issue for me. Some of the best $4 I ever spent

Where did you buy a $4 one?

Wolf 335 · 03-03-2016, 03:27 PM

Quote:

Originally Posted by nkspear

Where did you buy a $4 one?

I don't know where he got that $4 one, but I can tell you that here in Toronto, Canada it's $20. For a damn o-ring

BKV122 · 03-03-2016, 05:00 PM

I wipe it clean everytime I change my oil

kkasson · 03-03-2016, 05:46 PM

Quote:

Originally Posted by Wolf 335

I don't know where he got that $4 one, but I can tell you that here in Toronto, Canada it's $20. For a damn o-ring

You can get one on Amazon for a few dollars. The first one I found is Sachs brand and is $6.82. There might be cheaper ones. Don't worry about finding one for your specific model or even the E90...BMW has been using the same reservoir for years, they should all be the same.

You can also use a generic one...I think the actual size is 42mm and 2mm thickness. That's approximately a #129 or #130 SAE o-ring. I got a pack of #129s at CarQuest but it wasn't exactly the right size. It fit and didn't leak, but it didn't feel right compared to the actual one. In the future I would just spend the extra couple dollars to get the correct one.

drawz · 03-03-2016, 10:15 PM

FCP Euro:

$2.79 for ZF brand (OE)
https://www.fcpeuro.com/products/bmw...et-32411128333

$5.47 for Genuine BMW
https://www.fcpeuro.com/products/bmw...al-32411128333

Just buy it when you order other stuff. ECS Tuning and others probably have similar pricing.

02-20-2016, 06:43 PM	#1
nkspear New Member 3 Rep 13 Posts Drives: 2007 E92 335i MT Join Date: Nov 2015 Location: Raleigh, NC iTrader: (0)	Power steering leak through cap Just got my 2007 335i back from the shop getting repaired after I was rear ended and noticed a weird burning rubber/plastic smell. Opened the hood to find an overflow/leak through the power steering cap. Is this the reason for the smell? Has anyone had similar experience? Attached Images
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02-20-2016, 06:48 PM	#2
RKP Lieutenant 115 Rep 451 Posts Drives: 2018 BMW M3 CS (F80) Join Date: Jul 2015 Location: Cherry Hill, NJ iTrader: (0) Garage List 2018 BMW M3 CS [0.00]	I have a similar issue as well, opened the cap and still plenty in there. I have just left it alone until my steering starts to deteriorate.
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02-20-2016, 06:57 PM	#3
Sgop335 Colonel 648 Rep 2,011 Posts Drives: 07 335i e92, 08 535i Join Date: Jun 2014 Location: MD iTrader: (1)	Its a simple o ring fix. __________________ 335i e92 TPC 19Ts
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02-24-2016, 10:14 AM	#4
hoopvillian Private First Class 21 Rep 178 Posts Drives: 335i Join Date: Apr 2010 Location: Dago iTrader: (0)	http://www.amazon.com/gp/product/B00...rch_detailpage It might look like there's no Oring on yours because it's compressed. It's there, use a pick to get it off.
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02-24-2016, 10:25 AM	#5
Wolf 335 Brigadier General 2341 Rep 3,539 Posts Drives: 2007 E92 335i Join Date: Aug 2012 Location: GTA - Greater Toronto Area iTrader: (0)	Even with a new o-ring you will still have a leak there. It's designed to vent, hence the hole on the cap. There are solutions to it, but you gotta do a search.
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02-28-2016, 11:03 PM	#6
Meeni Gateropode 329 Rep 2,848 Posts Drives: BMW 330i 06 Join Date: Apr 2012 Location: TN iTrader: (0)	I replaced the oring, and it solved that issue for me. Some of the best $4 I ever spent
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03-03-2016, 05:00 PM	#9
BKV122 Major 47 Rep 1,160 Posts Drives: E90 Join Date: Feb 2009 Location: NY iTrader: (1) Garage List 2006 330xi [9.50]	I wipe it clean everytime I change my oil __________________ Monaco Blue 330xi - Terra Interior/6-MT/Sport/Premium/Cold/CSL's/M3 Spoiler Lip/Black Kidney's
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03-03-2016, 10:15 PM	#11
drawz Second Lieutenant 78 Rep 239 Posts Drives: 06 330xi 6MT, 08 535xiT 6MT Join Date: May 2009 Location: Newton, MA iTrader: (0)	FCP Euro: $2.79 for ZF brand (OE) https://www.fcpeuro.com/products/bmw...et-32411128333 $5.47 for Genuine BMW https://www.fcpeuro.com/products/bmw...al-32411128333 Just buy it when you order other stuff. ECS Tuning and others probably have similar pricing.
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