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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 11-09-2009, 11:10 AM   #1
spennI
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PS Cap/Reservoir Gunk

Before cleaning my engine bay several months back I noticed a lot of gunk on the PS reservoir cap and down the side of the reservoir. A month later and I now noticed gunk on the cap and down the sides of the reservoir. I don't see any ps fluid on my garage floor but a little on the lines attached to the reservoir. It appears the fluid is coming from the cap (maybe the cap isn't tight enough )

Is this a case where the clamps need replacing? Do I have too much fluid in the reservoir? I checked and the fluid level looks fine?

Thoughts, please.
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Old 11-10-2009, 01:05 PM   #2
barfoot1
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I had the same problem on my 325, the body of the reservoir would be caked in grime. Assuming your cap is not damaged, try replacing the cap O-ring (#3 in the picture below), that worked for me.

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Old 11-10-2009, 01:37 PM   #3
spennI
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Barfoot1: I'll give that a try.
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Old 12-07-2009, 04:13 PM   #4
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I replaced the PS reservoir, cut 1/2" off both hoses, replaced both clamps w/ screw clamps and no more leaks.
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Old 12-08-2009, 04:17 AM   #5
///Mechanic
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There is nothing wrong. There is a breather hole in the cap. No matter what you do to the system, or no matter what you 'think' you fixed, you will never always have a clean reservoir.
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Old 12-08-2009, 07:45 AM   #6
spennI
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Hmmmmmm I C.
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Old 12-08-2009, 06:39 PM   #7
ZR1Trev
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Quote:
Originally Posted by ///Mechanic View Post
There is nothing wrong. There is a breather hole in the cap. No matter what you do to the system, or no matter what you 'think' you fixed, you will never always have a clean reservoir.
This may be true, but I know that my O-ring (item 3 in diagram above) was rock hard and deformed. I replaced it and there was a big improvement in the amount of fluid seepage on the outside of the reservoir.
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Old 12-08-2009, 09:38 PM   #8
///Mechanic
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Originally Posted by ZR1Trev View Post
This may be true, but I know that my O-ring (item 3 in diagram above) was rock hard and deformed. I replaced it and there was a big improvement in the amount of fluid seepage on the outside of the reservoir.
If you see obvious damage like that, I can see it resolving a large amount of it. That is probably from over-tighening it.
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Old 02-20-2010, 07:29 PM   #9
4G63 T
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Quote:
Originally Posted by barfoot1 View Post
I had the same problem on my 325, the body of the reservoir would be caked in grime. Assuming your cap is not damaged, try replacing the cap O-ring (#3 in the picture below), that worked for me.

any part number on #3?
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Old 02-21-2010, 09:20 AM   #10
ZR1Trev
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You can find the part number on realoem.com. Part number is: 32411128333

Autohausaz.com or pelicanparts.com has it for around $1.50 plus shipping.
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