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2007 XC() Fuel injector O ring size 30777501

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
RivaRay
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2007 XC() Fuel injector O ring size 30777501

Post by RivaRay » Sun Jan 05, 2020 12:27 pm

Anyone out there know what O ring size is used for fuel injector? I believe fuel injector is part # 30777501 and o-ring set is part # 30713614.

I need to remove the fuel rail on my 2007 XC90 3.2 FWD to access screw that holds the pressure sensor. My understanding is when removing the fuel injector, O ring might be damage so needs to be replaced before re attaching. That O ring kit seems to be special order everywhere I look.

I found a set of O rings in various sizes in plumbing section of hardware store. Would these be ok to use or are the O rings on fuel injector something special?
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Re: Fuel injector O ring size

Post by oragex » Sun Jan 05, 2020 1:51 pm

Hardware store o-rings for plumbing are not petroleum/gasoline compatible so won't do.

I did remove more than one fuel rail and never got a seal damaged. Always put them back in and no leaks - but I clean every surface realyl well and very important - with both new or old ones - smear the injector with some Vaseline, otherwise it will chip (same with any FPS sensor). So good chance you won't have to replace them.

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Re: Fuel injector O ring size

Post by RivaRay » Sun Jan 05, 2020 3:54 pm

oragex wrote:
Sun Jan 05, 2020 1:51 pm
Hardware store o-rings for plumbing are not petroleum/gasoline compatible so won't do.

I did remove more than one fuel rail and never got a seal damaged. Always put them back in and no leaks - but I clean every surface realyl well and very important - with both new or old ones - smear the injector with some Vaseline, otherwise it will chip (same with any FPS sensor). So good chance you won't have to replace them.
Good point. Thank you. Hopefully will come out and go back in with no issue.
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Re: Fuel injector O ring size

Post by pgill » Sun Jan 05, 2020 9:01 pm

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RivaRay
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Re: Fuel injector O ring size

Post by RivaRay » Sun Jan 05, 2020 9:06 pm

pgill wrote:
Sun Jan 05, 2020 9:01 pm
[font=][/font]3DDA5FF7-C493-4D5D-85A1-241B9D9EC94B.jpeg
B159137B-4934-4713-A6EA-B7FB5DC55FCD.jpeg
6BEEB1D4-DDC2-4E1C-8603-C51D1B888275.jpeg
85A38DAC-7A85-416A-8127-AA3CB2426FEE.jpeg
A8425C5F-0BF9-4882-8FE0-62C52FC2D8D3.jpeg
0974586D-7EEB-453C-B1DB-E154F391CBBA.jpeg
Thank you
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RivaRay

Re: Fuel injector O ring size

Post by RivaRay » Sun Jan 05, 2020 9:11 pm

Follow up question... Removed fuel rail, cleaned everything, replaced sensor, greased o rings with synthetic grease, and re installed. Car started up great. Check engine light is gone

... but, fuel injector # 4 is emitting a light but steady stream of white smoke. Only #4 (inline 6 cylinder).

I read that white smoke is water vapor, it's black and gray smoke which is concern. This smoke is white and there isn't a lot but it's been coming out for at least 30 minutes. Smells fine.

Does this sound like something to be worried about? Any thoughts on what it might be?

... I took the plunge and drove it around. Smoke seems to be gone so hopefully whetever it was has burned off. If someone knows the likely source though, I'd love to hear your thoughts. Still on my mind.
Last edited by RivaRay on Mon Jan 06, 2020 12:34 pm, edited 1 time in total.
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Re: 2007 XC() Fuel injector O ring size 30777501

Post by abscate » Mon Jan 06, 2020 11:55 am

Shout out to pgill for the measurements and pictures

That will save someones' behind here someday
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Re: Fuel injector O ring size

Post by RickHaleParker » Mon Jan 06, 2020 1:53 pm

RivaRay wrote:
Sun Jan 05, 2020 9:11 pm
Does this sound like something to be worried about? Any thoughts on what it might be?
White "smoke" is steam and there is only two sources of water. Condensation in the exhaust system, which should blow off as the exhaust system heats up and the coolant system. How is your coolant level? Any signs of gases in the coolant system?
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
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Re: 2007 XC() Fuel injector O ring size 30777501

Post by pgill » Tue Jan 07, 2020 10:57 am

Abscate Thanks

Here are the sizes for the O - rings as measured by my calibrated calipers

Green
I.D. 9.5 mm (.374")
O.D. 15 mm (.591")
Thickness 2.9 mm (.114")

Brown
I.D. 7.5 mm (.295")
O.D. 14.5 mm (.571")
Thickness 3.5 mm (.138")


I haven't found an aftermarket source

But as shown in the picture the O-rings can be bought from Land Rover Part number LR003579

If someone knows the correct Volvo part number please post it here for reference

Thanks

Paul

RivaRay
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RivaRay

Re: Fuel injector O ring size

Post by RivaRay » Tue Jan 07, 2020 6:49 pm

RickHaleParker wrote:
Mon Jan 06, 2020 1:53 pm
RivaRay wrote:
Sun Jan 05, 2020 9:11 pm
Does this sound like something to be worried about? Any thoughts on what it might be?
White "smoke" is steam and there is only two sources of water. Condensation in the exhaust system, which should blow off as the exhaust system heats up and the coolant system. How is your coolant level? Any signs of gases in the coolant system?
Thanks!

No gas in the coolant tank. Not sure if you mean something else by "coolant system". It wasn't low when starting the repair but was low after repair. Hoping that's normal. I topped the coolant and haven't seen the steam anymore. Will check again tonight/tomorrow to be sure.
- Raymond

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