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Old 11-22-2004, 08:47 AM   #1
zombiedog
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Default Info for when you tear up your injector o-rings

The dealership tried to charge me 36$ and some change for 4 tiny o-rings that go onto the injector tops. These are commonly torn when people change their injectors.

After some research and looking around at my favorite site mcmaster.com I found that the 8mm ID by 2mm thick o-rings are an exact match. Part #9263K169. These are the ones made out of Viton which are the oil/gas resistant kind.

I also tested out and found that the 7mmx2mm are better because they fit more snugly and have less of a tendency to tear during installation. I did test this and I'm currenly running it on my car.

A pack of 25 is 9$ which is what they were going to charge me for one!!!

Edit: Also you usually get them overnight through their regular shipping.
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Last edited by zombiedog; 11-22-2004 at 08:54 AM.
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Old 11-22-2004, 08:48 AM   #2
Valhakar
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Very good find.
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Old 11-22-2004, 09:01 AM   #3
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Good timing, I just bought a set of used Pinks and I was about to order these from the dealer. The 8mm rings will work as well correct?
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Old 11-22-2004, 09:29 AM   #4
zombiedog
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The 8mm are an exact OEM match. The 7mm are for us risk takers.
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Old 11-22-2004, 10:38 AM   #5
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Excellent! Not two weeks ago I went to the dealer and they tried to charge me $7/o-ring Luckily I didn't buy them. Thanks a lot for posting this.
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Old 11-22-2004, 12:47 PM   #6
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Sweetness, can I ask how long you've been running these on your car for? I don't want to mess with anything that deals with fuel delivery as far as sealing things off properly is concerned. Logical thinking would dictate that the dealership is just trying to rape us all by charging us upwards of $7 for an O-ring and that there's nothing special about their OEM ones compared to the ones on mcmaster.com, but the wussy side of me also says, hey man what if their IS something special about the oem ones? I'm just paranoid. Can you offer some more reassurance? Thanks, haha.

Last edited by imprezive one; 11-22-2004 at 01:27 PM.
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Old 11-23-2004, 10:16 AM   #7
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All that matters is that they are the EXACT same size and made of a material that doesn't break down when it comes in contact with gas/hydrocarbons or oil.

I have benn running them for a few weeks now, 0 leakage...and I even used the smaller size on the drivers side injectors for an experiment.

The dealer is raping you..how more simple can you get than an o-ring?? You put them side by side, measure them, strech them, etc. They are identical. I may even say they are better especially the 7mm because the OEM ones seem to loosen and get weak over a short time. I have an 03 and my stockers were floppy which is why they tore when I reinstalled them. I'm guessing this is why so many people tear them too.

Note: The 7mmx2mm o-rings size difference is so close to the 8mmx2mm you can barely see it. Once the o-ring is on the injector the seal area is exactaly the same size. The only real difference is that there is less play when it is on the injector. This helps prevent tearing when installing because it stays alligned during insertion, much better than the looser 8mm.
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Old 11-23-2004, 10:26 AM   #8
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Don't be so hasty.

It IS very possible they're "just o-rings".

It's also very possible they're not as simple as you think, but you're making a lot of sweeping assumptions with nothing to back it up. That's fine, just state it as such, please.

I appreciate the info regardless.
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Old 11-23-2004, 10:34 AM   #9
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Agreed, I'll be the 1st to let you guys know if something happens. But seems like zero risk on the stock size, ya know.
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Old 11-23-2004, 12:18 PM   #10
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Cool thanks for the follow-up. I'll have to see for myself I guess.
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Old 11-23-2004, 12:53 PM   #11
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One time I was having a discussion with my dad about "gas and oil safe" materials. (he is an engineer and has been in charge of systems maintenance and construction at several petroleum refineries). He thought it was pretty funny that we worry so much about it. Fuel isn't corrosive; damn near ANYTHING is safe in a fuel / oil environment.
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Old 11-23-2004, 12:53 PM   #12
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An awful lot of people have used o-rings from Ace hardware with no ill effects. These are not some edge-of-reality nanotechnology here - they are little circles of rubber-like material!

Just get some that won't dissolve and don't worry about it.

-Sean
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Old 11-23-2004, 12:57 PM   #13
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Quote:
Originally Posted by 0db
One time I was having a discussion with my dad about "gas and oil safe" materials. (he is an engineer and has been in charge of systems maintenance and construction at several petroleum refineries). He thought it was pretty funny that we worry so much about it. Fuel isn't corrosive; damn near ANYTHING is safe in a fuel / oil environment.
Go ahead and have yourself some experiments with gasoline and a few different petro-chemical based compounds (plastics - nylons - polyesters - etc.) as well as some natural rubber. After dissolving a few things in the gasoline, please come back and comment. No, we are not talking Aqua Reggia here, but, over time, some compounds will degrade in gasoline - compunds that would be more or less perfectly safe in water.

-Sean
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Old 11-23-2004, 01:37 PM   #14
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Sweet! My roomate works for McMaster-Carr, so I'll have him bring some home for me
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Old 11-23-2004, 01:43 PM   #15
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I think when I die I will go to McMaster.
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Old 11-23-2004, 01:45 PM   #16
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Keep in mind too that a few weeks is many miles for me..70+ miles a day for me and my stage4 ++++.
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Old 11-23-2004, 02:39 PM   #17
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i will buy someones left over o-rings!!! I am getting some pinks soon, so I'll need them...I want the "OEM Style" ones not other size though. If anyone has them let me know.
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Old 11-23-2004, 07:31 PM   #18
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Cleaned up and re-opened the thread because I feel there is good info in here. If you want to argue, keep it in PM's. Points will be awarded to those who were previously arguing regardless of fault. If you're not adult enough to not post a rude comment, you should be adult enough to ignore one. If you're not adult enough for either, go away.
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Old 11-23-2004, 08:09 PM   #19
jjunior887
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I ordered a set yesterday evening and they were on my front porch waiting when I got home today, talk about some quick standard shipping.
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Old 11-24-2004, 07:32 AM   #20
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small drop of WD-40 oil on top injector O-rings for easy install
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Old 11-24-2004, 11:48 AM   #21
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You should always lube o-rings for install. Grease, oil, whatever you have handy, but don't try to install 'em dry.
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Old 11-24-2004, 01:03 PM   #22
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Quote:
Originally Posted by cky211
small drop of WD-40 oil on top injector O-rings for easy install
Don't use WD40 on rubber products. Over time the rubber itself becomes dry and brittle because of the leeching effects of the WD40. If you want your rubber parts to last, DO NOT USE WD40.

The post above states some good lubes that are rubber or Viton safe.



With that said, I'd like to vouch for the Viton seals that zombiedog posted. I've been using Viton injector seals as replacements for a few years now with no issues. They're a great cost effective replacement to the overpriced OEM option.


good thread, btw.
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Old 11-24-2004, 01:12 PM   #23
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Too many people misunderstand the applications of WD40.
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Old 11-24-2004, 01:18 PM   #24
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Quote:
Originally Posted by jblaine
Too many people misunderstand the applications of WD40.
very true.
I found out the hard way a few years ago what WD40 does to rubber products. I conducted a test after seeing a number of rubber seals fail. I found that WD40 virutally broke down rubber into pieces, or sheets that were pulling away from the o-ring itself. not only that, but when the part was removed from the WD40 bath, it quickly swelled, then hardened.

A friend who is an engineer in the pneumatics industry recently confirmed that WD40 is a no-no in most shops that deal with rubber seals, and whatnot. Too bad too, since WD40 is such a wonderful tool.
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Old 11-24-2004, 02:45 PM   #25
imprezive one
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Quote:
Originally Posted by jjunior887
I ordered a set yesterday evening and they were on my front porch waiting when I got home today, talk about some quick standard shipping.

That rules. How much is shipping anyways? I know some places will have a good price for a small product (such as these) and then rape you on the shipping, like it'll cost more than the actual product.
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