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Old February 11th, 2017, 00:17   #106
03TDICommuter
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Can someone tell me if 74mm is the ID or OD of the 2.5mm thick o ring needed?

McMasterCarr has Viton black o-rings for $6.33 for a 2 pack but it's 74mm OD.

https://www.mcmaster.com/#1295n494/=16ay92h

If ID, it's a custom made oring
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Old February 17th, 2017, 22:47   #107
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Quote:
Originally Posted by 03TDICommuter View Post
Can someone tell me if 74mm is the ID or OD of the 2.5mm thick o ring needed?

McMasterCarr has Viton black o-rings for $6.33 for a 2 pack but it's 74mm OD.

https://www.mcmaster.com/#1295n494/=16ay92h

If ID, it's a custom made oring
Anyone?

I'd like to pull my vacuum pump and replace the seals and clean up the oil leak.
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Old February 17th, 2017, 23:03   #108
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BRM oil filter o-ring:
OE Part number is 071115444
I purchased mine at the dealership.
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Old February 17th, 2017, 23:20   #109
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Quote:
Originally Posted by 03TDICommuter View Post
Anyone?
I'd like to pull my vacuum pump and replace the seals and clean up the oil leak.
OD will be fine. That's what I used. You might have to stretch it just a little bit though. Going on 15k miles and leak free.
I did buy an oil filter (wix) for the brm. Gasket lasted 100 miles and then started leaking.
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Old February 18th, 2017, 00:31   #110
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OD will be fine. That's what I used. You might have to stretch it just a little bit though. Going on 15k miles and leak free.
I did buy an oil filter (wix) for the brm. Gasket lasted 100 miles and then started leaking.
So you started with the brm oil filter o-ring and later used a 74mm OD Viton?
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Old February 18th, 2017, 09:15   #111
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Yup, the brm gasket that came with the wix filter swelled up almost immediately causing leak again. The Viton o-ring I used is this. http://www.theoringstore.com/index.p...ducts_id=41003
See this post. http://forums.tdiclub.com/showpost.p...5&postcount=97
So far it's working perfectly.
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Old February 18th, 2017, 13:57   #112
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Quote:
Originally Posted by boertje View Post
Yup, the brm gasket that came with the wix filter swelled up almost immediately causing leak again. The Viton o-ring I used is this. http://www.theoringstore.com/index.p...ducts_id=41003
See this post. http://forums.tdiclub.com/showpost.p...5&postcount=97
So far it's working perfectly.
Thanks! I'm going to go ahead and get the McMaster Viton one. We order so much from them at work that I can tack on my o-ring for essentially 'free shipping'.
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Old February 18th, 2017, 18:54   #113
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Quote:
Originally Posted by 03TDICommuter View Post
Thanks! I'm going to go ahead and get the McMaster Viton one. We order so much from them at work that I can tack on my o-ring for essentially 'free shipping'.
Sounds good. Keep us posted on how that works out.
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Old December 29th, 2017, 10:27   #114
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According to above posts in this thread the correct oring size is 74mm ID x 2.5mm CS. http://www.theoringstore.com/index.p...ducts_id=41003

A suitable alternative may also be AS568 Size 150. These are 2-7/8"ID X 3-1/16"OD X 3/32"CS (Metric: 72.69mm ID X 2.62mm CS) which is pretty close to the metric one http://www.theoringstore.com/index.php?main_page=product_info&cPath=367_79_83&p roducts_id=3574

The cost for the AS568 Size 150 is $1.00 ea while the metric is over $7.00 ea.

I ordered several and will try them out when they come in.

Last edited by mrseadog; December 29th, 2017 at 10:36.
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