E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > Tuning & Tech > DIY: Do It Yourself

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!

Reply
 
Thread Tools Search this Thread Rating: Thread Rating: 105 votes, 5.00 average. Display Modes
Old 03-02-2012, 07:01 PM   #1
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
Replacement O-rings on Upper/Lower/Expansion Tank(s) O-ring only

The following items comes with their o-ring(s) within the part itself:

Upper and Lower Radiator hose (4X o-rings)
Expansion Tank (1X? o-ring)
Temperature sensor (1X green o-rings)

Have anyone tried replacing these O-Rings?? If yes, provide o-ring size (part no.) and where to get it.

One place that probably might have it / matching o-ring is 'Grainger.com'
__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake



Last edited by sellsellsell2000; 03-05-2012 at 01:25 PM.
sellsellsell2000 is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 03-03-2012, 02:19 PM   #2
ddaniel1
CWO4 (Ret)
 
ddaniel1's Avatar
 
Join Date: Nov 2011
Location: San Diego
Posts: 548
My Ride: 328i, M3, 525iT
I have thought about this also, good quality Viton o-rings should increase cooling system reliability, although we are still at the mercy of heat cycled plastic cracking and thermostats that dont last long. BMW part number for the temp sensor is 13621743299. There are two o-rings in the bottom of the expansion tank. I have my old ones but I am hesitant to measure them because they are deformed pretty bad, best to use some brand new ones, all my new stuff is already installed unfortunately.
http://www.ecstuning.com/BMW-E46-328...43299/ES34373/
ddaniel1 is offline   Reply With Quote
Old 03-04-2012, 09:14 PM   #3
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
Quote:
Originally Posted by ddaniel1 View Post
I have thought about this also, good quality Viton o-rings should increase cooling system reliability, although we are still at the mercy of heat cycled plastic cracking and thermostats that dont last long. BMW part number for the temp sensor is 13621743299. There are two o-rings in the bottom of the expansion tank. I have my old ones but I am hesitant to measure them because they are deformed pretty bad, best to use some brand new ones, all my new stuff is already installed unfortunately.
http://www.ecstuning.com/BMW-E46-328...43299/ES34373/
Thank you for the Temp sensor o-ring link. You saved me $30
__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake


sellsellsell2000 is offline   Reply With Quote
Old 03-04-2012, 10:28 PM   #4
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
Alright, here are the list of o-rings I need for my fairly new parts:

Upper Radiator Hose ~ 3X o-rings



Lower Radiator Hose ~ 2X o-rings



Temp Sensor ~1X o-ring



Expansion Tank ~ 2X o-rings



Gonna takes these o-ring to the local 'Grainger' and have them match it up for me. Will provide update/status with each o-ring (part no.) from Grainger.

__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake



Last edited by sellsellsell2000; 03-05-2012 at 01:25 PM.
sellsellsell2000 is offline   Reply With Quote
Old 03-04-2012, 10:37 PM   #5
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
The two o-ring from the Upper & Lower Radiator Hose are the same. So is the one of the Expansion Tank o-ring. As for the Temp Sensor, tiny o-ring from the upper radiator hose and Expansion Tank need to match it separately.
__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake


sellsellsell2000 is offline   Reply With Quote
Old 03-05-2012, 01:26 PM   #6
ddaniel1
CWO4 (Ret)
 
ddaniel1's Avatar
 
Join Date: Nov 2011
Location: San Diego
Posts: 548
My Ride: 328i, M3, 525iT
Awesome, if you have a dial caliper you can measure the inside diameter and the thickness of the material for a standard size, my assumption is that these are metric, so an example would be 27x3mm.

Last edited by ddaniel1; 03-05-2012 at 04:38 PM.
ddaniel1 is offline   Reply With Quote
Old 03-05-2012, 05:19 PM   #7
NoVaDreier
Registered User
 
Join Date: Nov 2002
Location: Alexandria, Va.
Posts: 529
My Ride: 2001 325i
Try BMP Design.
NoVaDreier is offline   Reply With Quote
Old 03-05-2012, 07:01 PM   #8
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
Quote:
Originally Posted by NoVaDreier View Post
+1

Thanks. The 2" Coolant Hose O-ring should fit; as it it described under their descriptions.

Just checked the 'Expansion Tank' O-ring, the big one is the same as the upper & lower radiator hose. So, i'm ordering 5 of the 2" o-rings.

As for the 1", 1.125" and 1.5"; I've ordered those one of each. Will post result once i match up the parts.

__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake



Last edited by sellsellsell2000; 03-28-2012 at 01:40 AM.
sellsellsell2000 is offline   Reply With Quote
Old 03-12-2012, 09:45 PM   #9
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
UPDATE!

Just received the 'O-RINGS' today.

The 2" O-rings seems a little bit smaller than the ones i have taken out from the NEW parts. I've ordered total of FIVE:

* 2" - 2X for the upper radiator hose.
* 2" - 2X for the lower radiator hose.
* 2" - 1X for the expansion tank
* 1.125" - 1X for the expansion tank
* 1" - 1X for the upper radiator hose (bleeder valve).

*** Temp Sensor O-rings from: http://www.ecstuning.com/BMW-E46-328...43299/ES34373/

More update after installed; (monitor for leakage).
__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake



Last edited by sellsellsell2000; 03-28-2012 at 01:40 AM.
sellsellsell2000 is offline   Reply With Quote
Old 03-12-2012, 11:41 PM   #10
flashmeow
Banned User
 
Join Date: Apr 2008
Location: Dallas, TX
Posts: 2,217
My Ride: E30-E46-E90-E90M-F30
Quote:
Originally Posted by sellsellsell2000 View Post
UPDATE!

Just received the 'O-RINGS' today.

The 2" O-rings seems a little bit smaller than the ones i have taken out from the NEW parts. I've ordered total of FIVE:

* 2" - 2X for the upper radiator hose.
* 2" - 2X for the lower radiator hose.
* 2" - 1X for the expansion tank
* 1.25" - 1X for the expansion tank
* 1" - 1X for the upper radiator hose (bleeder valve).

*** Temp Sensor from: http://www.ecstuning.com/BMW-E46-328...43299/ES34373/

More update after installed; (monitor for leakage).
amazing post and great updates. please keep us posted. I am especially interested because I am planning to do the same thing also. I am removing my water hoses and need new o-rings.

thanks again for the contribution
flashmeow is offline   Reply With Quote
Old 03-28-2012, 01:43 AM   #11
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
UPDATE *** 3/27/2012 ***

ITEM 05 ~ Return Hose (aka Heater Hose) requires (2X) of the 1.125" o-ring.



Here is the link to purchase these O-rings.

http://www.bmpdesign.com/category-ex...h_model%5D/72/
__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake



Last edited by sellsellsell2000; 03-28-2012 at 01:51 AM.
sellsellsell2000 is offline   Reply With Quote
Old 03-28-2012, 09:51 AM   #12
Nervous
Registered User
 
Join Date: Dec 2010
Location: MD, USA
Posts: 1,489
My Ride: 01 330CI 6MT ZSP EU3
Thanks for the update, this is exactly what I need to know (replacing rad and both main coolant hoses, but don't want to replace the heater hose; replacement of o-ring sounds as a right thing to do).
Nervous is offline   Reply With Quote
Old 03-28-2012, 05:58 PM   #13
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
Remember not to remove the coolant sensor from the expansion tank; try not to. The o-ring for the sensor is embedded inside the expansion tank.

NOTE: THREE 1.125" o-ring is required; one on the expansion tank, one on the return hose, one on the other heater hose.
__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake


sellsellsell2000 is offline   Reply With Quote
Old 03-30-2012, 07:16 AM   #14
Dan330Ci~
Registered User
 
Join Date: May 2011
Location: UK
Posts: 217
My Ride: 330Ci Clubsport
I bought a new expansion tank yesterday, part number 17 11 7 573 781, it has two o rings, here are the designations:

22x3.5 mm (7/8x9/64 in) (0.8750x0.1406 in)
38x4.0 mm (1,1/2x5/32 in) (1.5000x0.1563 in)

Sizes are inside diameter x cross sectional diameter.
__________________
'04 330Ci Clubsport | Estoril Blue | 6MT | Black Leather/Silver Cube
Turner Motorsport | Ground Control | Stett Performance | Moroso | Powerflex | Meyle HD | Goodridge
Dan330Ci~ is offline   Reply With Quote
Old 03-30-2012, 11:39 AM   #15
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
Quote:
Originally Posted by Dan330Ci~ View Post
I bought a new expansion tank yesterday, part number 17 11 7 573 781, it has two o rings, here are the designations:

22x3.5 mm (7/8x9/64 in) (0.8750x0.1406 in)
38x4.0 mm (1,1/2x5/32 in) (1.5000x0.1563 in)

Sizes are inside diameter x cross sectional diameter.
Thanks, http://www.bmpdesign.com has all the O-rings except for temp sensor o-ring.

I have everything installed now, and it is been two days. No overheating issue nor leaks yet, but will monitor the coolant level.

*** crossing fingers ***
__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake



Last edited by sellsellsell2000; 03-30-2012 at 11:42 AM.
sellsellsell2000 is offline   Reply With Quote
Old 04-12-2012, 02:55 PM   #16
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
Is been about two weeks now after the installation. I have not seen any sign of coolant leak(s).
__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake


sellsellsell2000 is offline   Reply With Quote
Old 05-22-2012, 07:40 PM   #17
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
Still no leaks.
__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake


sellsellsell2000 is offline   Reply With Quote
Old 07-28-2012, 01:58 PM   #18
dookieface
Registered User
 
Join Date: May 2012
Location: pa
Posts: 8
My Ride: 330xi
RESURRECTION:::::

One thing I wanna shed some light on to / have figured out is the O-rings for the Expansion Tank - Cap.
I noticed there are two o rings and, 1 flat o ring.

I just came from the dealer and the cap doesn't come with the expansion tank. The cap cost me a little over 25 bucks.
Now if we just changed the rings....
dookieface is offline   Reply With Quote
Old 11-16-2012, 05:31 PM   #19
sdstevep
Registered User
 
Join Date: Nov 2012
Location: San Diego, CA
Posts: 2
My Ride: 325Ci
E46 Cooling System O-Rings sizes

Not to discredit the previously posted links for o-rings, but below is another option that includes actual o-ring sizes.

These I know fit my particular car, which is a 2002 model year 325Ci, E46, M54 engine. VIN starts with WBABN33442JW, 7/2002 production date.

pn desc Cost/pack
9262K274 Metric Buna-N O-Ring, 3 mm Width, 16 mm ID, Packs of 100 $13.25
9262K795 Metric Buna-N O-Ring, 3.5 mm Width, 22 mm ID, Packs of 50 $6.18
9262K357 Metric Buna-N O-Ring, 4 mm Width, 38 mm ID, Packs of 25 $10.78

Part numbers are for McMaster Carr.
http://www.mcmaster.com/

I did have to order WAY more o-rings than I needed, but I felt like it was still worth it not to have to buy hoses just to get the o-rings. PLUS, I can't be sure but it seems like these o-rings actually do provide a bit snugger fit than the ones that come with the hoses. I had replaced my hoses only about a year ago, and then had to disassemble the upper hoses to replace the thermostat. After reassembly the fittings at the bottom of the expansion tank were leaking. The new o-rings fit WAY snugger on that tank, and it isn't leaking now! I'm quite happy with the fit of these.

Buna-N is the material I bought, and Buna-N means the same thing as Nitrile. McMaster says "Buna-N is used in oil applications. Temperature range is -35 to +250 F. Durometer hardness is A70. Meets ASTM D2000/SAE J200. Color is black." That 250 degree F max temperature rating is a little scary but I can't imagine BMW used anything different. Viton probably would have been a better choice, but it is way more money and I'm not sure they have these sizes available - you can check.

The above is what I ordered, plus they added sales tax and shipping. They don't make it easy to find out shipping cost - when you build the order they only tell you they're going to add shipping and tell you later. It worked out ok for me -- I live in San Diego, they shipped the order out of their Los Angeles warehouse and only charged me $4.42. I ordered online on a Sunday and they actually attempted delivery the very next day, Monday! So for me at least, shipping cost was more than reasonable.

Good diagram of the hoses (someone else already posted the diagram, but here's a url anyway) is at:
http://www.realoem.com/bmw/showparts...00&hg=11&fg=35

The o-rings fit hoses as follows:

First one, 16mm inside diameter x 3mm width: This is I think only one per car, fits the fitting on the upper radiator hose where it plugs into the expansion tank. (NOTE: I also tried a slightly larger O-ring for this one, size 3.5 mm Width, 16 mm ID, and I absolutely COULD NOT manage to get that one to seat in the groove in the hose fitting!

Second one, 3.5 mm Width, 22 mm ID: This fits the heater hoses, plus the smaller of the two fittings at the bottom of the expansion tank, so I think that makes 5 per car.

Third one, 4 mm Width, 38 mm ID, is the biggest, fits upper and lower radiator hoses plus the larger of the two fittings on the bottom of the expansion tank, I think that makes 5 per car.

I notice that that water hoses diagram (link above) shows an item 7 o-ring that they describe as 20 x 3. That's different from any of the sizes I found, but then it also is shown on different hoses than the ones I'm talking about. Just thought I'd mention it.

Last edited by sdstevep; 11-16-2012 at 05:39 PM. Reason: Clarification, correct a type
sdstevep is offline   Reply With Quote
Old 11-18-2012, 03:01 AM   #20
sellsellsell2000
Registered User
 
Join Date: Aug 2008
Location: San Francisco, CA
Posts: 548
My Ride: E46 seden
Send a message via AIM to sellsellsell2000
Quote:
Originally Posted by sdstevep View Post
not to discredit the previously posted links for o-rings, but below is another option that includes actual o-ring sizes.

These i know fit my particular car, which is a 2002 model year 325ci, e46, m54 engine. Vin starts with wbabn33442jw, 7/2002 production date.

Pn desc cost/pack
9262k274 metric buna-n o-ring, 3 mm width, 16 mm id, packs of 100 $13.25
9262k795 metric buna-n o-ring, 3.5 mm width, 22 mm id, packs of 50 $6.18
9262k357 metric buna-n o-ring, 4 mm width, 38 mm id, packs of 25 $10.78

part numbers are for mcmaster carr.
http://www.mcmaster.com/

i did have to order way more o-rings than i needed, but i felt like it was still worth it not to have to buy hoses just to get the o-rings. Plus, i can't be sure but it seems like these o-rings actually do provide a bit snugger fit than the ones that come with the hoses. I had replaced my hoses only about a year ago, and then had to disassemble the upper hoses to replace the thermostat. After reassembly the fittings at the bottom of the expansion tank were leaking. The new o-rings fit way snugger on that tank, and it isn't leaking now! I'm quite happy with the fit of these.

Buna-n is the material i bought, and buna-n means the same thing as nitrile. Mcmaster says "buna-n is used in oil applications. Temperature range is -35 to +250 f. Durometer hardness is a70. Meets astm d2000/sae j200. Color is black." that 250 degree f max temperature rating is a little scary but i can't imagine bmw used anything different. Viton probably would have been a better choice, but it is way more money and i'm not sure they have these sizes available - you can check.

The above is what i ordered, plus they added sales tax and shipping. They don't make it easy to find out shipping cost - when you build the order they only tell you they're going to add shipping and tell you later. It worked out ok for me -- i live in san diego, they shipped the order out of their los angeles warehouse and only charged me $4.42. I ordered online on a sunday and they actually attempted delivery the very next day, monday! So for me at least, shipping cost was more than reasonable.

Good diagram of the hoses (someone else already posted the diagram, but here's a url anyway) is at:
http://www.realoem.com/bmw/showparts...00&hg=11&fg=35

the o-rings fit hoses as follows:

First one, 16mm inside diameter x 3mm width: This is i think only one per car, fits the fitting on the upper radiator hose where it plugs into the expansion tank. (note: I also tried a slightly larger o-ring for this one, size 3.5 mm width, 16 mm id, and i absolutely could not manage to get that one to seat in the groove in the hose fitting!

Second one, 3.5 mm width, 22 mm id: This fits the heater hoses, plus the smaller of the two fittings at the bottom of the expansion tank, so i think that makes 5 per car.

Third one, 4 mm width, 38 mm id, is the biggest, fits upper and lower radiator hoses plus the larger of the two fittings on the bottom of the expansion tank, i think that makes 5 per car.

I notice that that water hoses diagram (link above) shows an item 7 o-ring that they describe as 20 x 3. That's different from any of the sizes i found, but then it also is shown on different hoses than the ones i'm talking about. Just thought i'd mention it.
+1
__________________
/// ( @ )( @ )

BMW /// 323i


OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake


sellsellsell2000 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON





All times are GMT -5. The time now is 08:55 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
(c) 1999 - 2016 performanceIX Inc - privacy policy - terms of use