Save my sanity. Need part numbers of small orings on power steering knuckle. Topic is solved

SteveV70 · Post by **SteveV70** » 16 Jun 2022, 15:13

For the Love of God could someone tell me the part number of the small orings on the steering rack knuckle. There are two sets of hard lines going to it,…one set of lines is about the size of a dime, the other set is the size of a pencil. I spent TWO hours online trying to find ANYONE who had a parts diagram that showed them.

I also have four sets of Oring assortments, in three different materials, both standard and metric. I replaced the larger ones and they seal. The smaller ones won’t seal using what I have, and I’ve tried it three different times.

I can find Volvo part numbers for the larger ones no problem….but the smaller ones seem to be made of something they want to keep a secret.

THIS IS DRIVING ME CRAZY !!!!

I’ve spent how much time chasing down two .10 cent orings ????

2007 V70 2.4 manual trans.

Save my sanity please…

Post by **abscate** » 16 Jun 2022, 18:43

I don’t think the small lines are ordersble as a separate part from the rack.

Post by **jonesg** » 16 Jun 2022, 19:53

there are companies who make rebuild kits.
google shows sources for rebuild kits. ipd, fcp, EBAY etc.

SteveV70 · Post by **SteveV70** » 16 Jun 2022, 21:03

The lines are fine. They are fitted to the knuckle in exactly the same way as the large supply and return lines. They are the lines that go to the actuator. There is a plate clamp that holds the line in just like the other lines. The line is fashioned like the other larger lines too. It has a crimped flange that acts as a raised stop to carry the O ring and the raised flange is captured by a plate clamp exactly like the larger lines. I know this because I’ve changed the orings three times replacing the factory ones that were very obviously hardened and flattened around the annulus due to age and heat cycling. I am a federally licensed Aircraft Mechanic (A&P) with airframe and power plant ratings…..so it’s frustrating not being able to readily find the approved part.

Anybody got a part number?

SteveV70 · Post by **SteveV70** » 16 Jun 2022, 21:10

And I don’t need a whole rebuild kit. I’ll buy one if I have to,…but I just need two small O rings. If Volvo has no part number for them, I’m wondering if they’re included with any rebuild kit I may order. My guess is there is a part number,…or at least a verified replacement,…otherwise how would anyone replace a rack?

Post by **vtl** » 16 Jun 2022, 22:04

https://www.drive2.ru/l/550164008653555114/

OD 9.27 CS 1.84
OD 8.81 CS 1.68

In millimeters. According to https://www.allorings.com/O-Ring-AS568- ... Size-Chart, you need sizes #10 and #9? Oil resistant material, apparently.

Post by **kallekula** » 17 Jun 2022, 08:11

If you just need orings, buy a whole pack with assorted sizes. Like $10 if not less at our favorite store HF! Make sure u get the oil/gas resistant ones.

SteveV70 · Post by **SteveV70** » 17 Jun 2022, 09:15

Did you read my initial post?
Check out that second paragraph….

SteveV70 · Post by **SteveV70** » 17 Jun 2022, 10:56

Ok guys,….there’s a saying that goes something like “If you’re getting resistance on something, one solution is to expand the picture”,…or scope, or something like that.

Well,….mystery solved.
I got really really into concentrating on where the oil was coming from on this last go around.
I got everything really really clean.
I got a strong flashlight really really close.

And,….it’s not those o rings.
It’s the seal where the input shaft goes in at the top of the knuckle.
It’s tilted backwards,…so a leak would run down the topside rear of it and present itself as a leak at where I was seeing,…thus wrongly implicating the line seals. It also makes more sense. That seal is a working “live” seal whereas the line seals are static. Also that seal lives in a horizontal position more or less, and has been gathering grit, salt, and whatnot for years,…and 225K miles. Duty done.

How did I confirm this you ask?
I tied a rag around the input shaft, started the car and proceeded to watch it NOT drip.
After a few minutes, pulled the rag, and in short order,…here comes the drip drip drip.

Soooo,….although I’m no longer going insane over some orings,…looks like I’m on the hook for the rack replacement. I looked hard at the input shaft to see if I might tackle a seal R&R in situ,…but that looks impossible. If anyone has had success doing that, I’m all ears.

For now, although I loathe those snake oil “seal expanding leak stop” additives you can get with some Power Steering fluids,…I’m gonna give that a Hail Mary try for now. Taking advice on replacement rack providers.
I’m scared to look at the Volvo Dealer price….

Thanks for putting up with my rants.
I love forums.

Post by **vtl** » 17 Jun 2022, 11:31

It's not very difficult to replace one. Need just some basic tools.