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Spare McMaster AOS O Ring Cap seal?
Posted: Tue Apr 21, 2026 8:39 am
by Glassmuseum
Hi! I am about to pull/replace my turbo and will be doing the AOS seals as well. just checking to see if anyone has a spare McMaster O Ring-
https://www.mcmaster.com/product/9396K172 that replaces the top cap O Ring for the air oil separator.
I was about to hit the order button but seems silly to spend 25 bucks with shipping on a 10 pack if someone has one laying around. Happy to throw a few bucks if someone has a spare. Thanks!
Re: Spare McMaster AOS O Ring Cap seal?
Posted: Tue Apr 21, 2026 9:19 am
by PSU_Crash
Glassmuseum wrote: Tue Apr 21, 2026 8:39 am
Hi! I am about to pull/replace my turbo and will be doing the AOS seals as well. just checking to see if anyone has a spare McMaster O Ring-
https://www.mcmaster.com/product/9396K172 that replaces the top cap O Ring for the air oil separator.
I was about to hit the order button but seems silly to spend 25 bucks with shipping on a 10 pack if someone has one laying around. Happy to throw a few bucks if someone has a spare. Thanks!
I have spare seals for this very reason and I'd be happy to send you one. When I get home this evening I'll grab the specs and send you a message.
Re: Spare McMaster AOS O Ring Cap seal?
Posted: Tue Apr 21, 2026 9:22 am
by Glassmuseum
Amazing @PSU_Crash ! Really appreciate it.
Re: Spare McMaster AOS O Ring Cap seal?
Posted: Tue Apr 21, 2026 12:10 pm
by michaelmount123
This o-ring may be suitable, but I imagine the original is a metric piece. McMaster carries metric too.
Re: Spare McMaster AOS O Ring Cap seal?
Posted: Tue Apr 21, 2026 4:07 pm
by PSU_Crash
This is the o-ring I used on mine. 2k miles later and it's still good. I call that a win.
If you got this far you haven't detroyed the cap while prying it off. Congratulations!
Re: Spare McMaster AOS O Ring Cap seal?
Posted: Tue Apr 21, 2026 4:18 pm
by Glassmuseum
PSU_Crash wrote: Tue Apr 21, 2026 4:07 pm
This is the o-ring I used on mine. 2k miles later and it's still good. I call that a win.
If you got this far you haven't detroyed the cap while prying it off. Congratulations!
Appreciate you! Just sent over my address via pm.
And yes if you have any good pointers lmk. I did this once with a NA I had a few years ago and it
mostly went well. Trying to find a cheap used turbo AOS as backup bc i’m anticipating something getting cracked.
Re: Spare McMaster AOS O Ring Cap seal?
Posted: Tue Apr 21, 2026 4:52 pm
by PSU_Crash
I followed NC944er with his method and used a little heat gun action. Much harder to remove than I had anticipated!
https://www.youtube.com/watch?v=lGaXEykh7nI