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Old February 10th, 2017, 23:17   #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, 21:47   #107
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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, 22:03   #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, 22:20   #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 17th, 2017, 23:31   #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, 08:15   #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, 12:57   #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, 17:54   #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, 09:27   #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 09:36.
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Old March 14th, 2018, 10:57   #115
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Quote:
Originally Posted by boertje View Post
The oring store is where I got my 2.5mm X 74mm just right size. The part number is V2.50X074. It is V75 Viton O-ring Black. If it's not listed on their web site, call them. That's what I did.
BTW, as per http://www.theoringstore.com/index.p...x&cPath=368_65, Operating temperature: -20 to +400F

Did this o-ring continue to be leak free? I'm about to order from the O-ring store myself and wanted to know if you would change the dimensions any for a better seal IF the one you put in hasn't stayed leak free. Thanks for any update you can give!
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Old March 14th, 2018, 11:07   #116
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Quote:
Originally Posted by mrseadog View Post
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.
How has the alternative size o-ring worked out? Staying leak free? I'm
about to order for my vacuum pump and am curious how the two sizes listed in this thread are working out. Thanks for any update you can give!
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Old March 14th, 2018, 12:03   #117
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I realize the one from the dealership is quite expensive compared to the "generic", but mine has been in for at least a year and there has been no problems with it.
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Old March 14th, 2018, 12:14   #118
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Originally Posted by Nevada_TDI View Post
I realize the one from the dealership is quite expensive compared to the "generic", but mine has been in for at least a year and there has been no problems with it.

I see from above posts that you used the brm oil filter ring. Thanks for your feedback!
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Old March 14th, 2018, 20:53   #119
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Quote:
Originally Posted by Solamia View Post
Did this o-ring continue to be leak free? I'm about to order from the O-ring store myself and wanted to know if you would change the dimensions any for a better seal IF the one you put in hasn't stayed leak free. Thanks for any update you can give!
Yes, this o-ring is still doing the job. I have a spare and will use it with confidence.
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Old March 17th, 2018, 21:06   #120
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So, after reading this entire thread, has anyone encountered loss of vacuum from having a leaky seal, or were you experiencing vacuum loss from the loose nipple? or both?
I checked my pump today and for sure, the nipple is loose. I attached my vacuum pump to the end of the EGR valve hose (will this still be accurate?) and got about 15" and after wiggling the loose nipple, I do see it fluctuate between 15 and 20". I also checked for any possible oil leaks from the head/pump seal and it seems like previous owner did some work on it because I can see some oily film on the back corner of the head cover. Couldn't tell you when that developed or if it's even from the vacuum/head seal, but will have to keep an eye on it after wiping it clean. After all the trouble everyone seems to be having with resealing the pump, I'm not sure I even want to take it off! haha

Anyway, today I came across this video on youtube (https://www.youtube.com/watch?v=7aRX4gfcpek) and was wondering if anyone had come across this before, and since nobody mentioned it, I thought I would share it. The website the kit can be bought is this (https://www.rkxtech.com/products/vw-...ump-reseal-kit). Some of you seem to have purchased the 2.5mmx74mm V75 Viton from the O-ring Store and seem to have no problems with it. I am thinking that if this is the right o-ring size, I might not have to get the kit I mentioned above since there are no specifications on the size of the o-ring included in the kit.

Finally, did anyone experience any issues replacing the head/pump seal? Not the round one but the oddly shaped one.

Ok, one more thing: since we the vacuum is also related to the brake booster, could this be the reason why my brakes, from time to time will make this weird noise when you slow down at low speeds, and feel some strange vibration on the brake pedal? It makes a sound kinda like a small compressor running for a few seconds...If I let release the brake pedal and press again, it goes away and brakes work normally. It happens very quickly and not every time. On average once a week, but sometimes two or three times that day. Anyway, maybe the loose nipple issue fixes both my low vacuum and my weird brake issue.

Last edited by BakoTDI; March 17th, 2018 at 21:16.
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