substitution to OPRV o-ring 99970714440?

[wwdwgs]

Hello, everyone.
Is there a substitution to OPRV o-rings 999 707 144 40 that can be obtained locally (like HD or Grainger or the like)?
I don't have these o-rings on hand and can't even measure them... Trying to help another 944 owner with his 1987 944S 16v.
Thanks in advance.

[djnolan]

there are many web sites that sell them but none of them list the dimensions. Maybe the PET lists the dimensions. you would need dimensions to try to source a replacement, or would need to measure it with a micrometer.

https://www.allorings.com/O-Ring-AS568-Standard-Size-Chart

[wwdwgs]

PET doesn't mention the size.
I think it's 26mm x 3mm, not sure yet.

[944 Ecology]

There are other factors besides the size... e.g. the material used and its resistance to the oils involved. Do you want to risk an engine due to installing an o ring that may fail. Stick with the factory part.

[wwdwgs]

George,
the guy, I ask this info for, can't get some parts using Porsche part numbers, and there's no way to cross reference them to other manuf. numbers. He can go by size and application (temp., compatible chemicals).

[944 Ecology]

No good deed goes unpunished...

Have you considered buying the correct part and mailing it to him?

[wwdwgs]

No bad deed goes unrewarded?
I'd considered. That's when the problems multiply. I told him everything I know about these o-rings and let's hope he'll figure out what to do.
Amen.

[Monkey Wrench]

granger, motion industries , spaenaur and other similar suppliers offer kits with multiple sizes and thicknesses. here Ill deal with fluidseal or other companies specialize in hydraulic seals if you have local hydraulic repair facility you can try there.

Porsche never made O rings.. you can buy kits to join the ends of O rings but I would not do that since it is an important one.

if you want to look at kits you can look here, Spaenaur has a huge catalog they are good at fulfilling online orders. based in Quebec.

https://spaenaur.cld.bz/Spaenaur-Catalog-141/A116/


the spaenaur kit I have here is part number A-216, these are Nitrile which is what most orings are.

they also offer "viton" and you can look that up.

there may be some that are special for example, food grade parts compatibulty or high heat applications, building space ships, lunar landing modules.. ;-)

the o ring has an inner and outer measurement , and the diameter of the O ring, rubber also comes in different harnesses or durometer so it is possible to find ones that are "speacial"

you may also find some kits in metric or standard.


Likely you have a local bearing retailer or seal retailer that caters to hydraulics, you might go see them and take the parts they can help. obviously you need oil compatibility.. its really common for someone rebuilding hydraulic valves and such to change orings and they should have a good kit.

this place can help you
https://www.sealsonline.com/fluidseal/


ordering the correct part may save some mucking about finding the correct one but I dont think you'd be too off track using a nitrile one, that's probably all it is.

because the application is special and a bad choice could be expensive Id just try to use the OEM but in the event you can't buy that, then I'd just be careful that its the correct size.

due to being rubber they can often be squished, deformed hardened up cracked etc, this makes accurate measurement of a used one a bit difficult you may also note that some are metric and others made to standard sizes. most bearings are metric , not all.

you can buy a kit and pick the closest one, then decide if it's suitable, but I have found situations where the exact size I need is not in the kit. for some purposes I'd be a bit more lenient, an example might be the one around the shaft of a distributor to prevent oil coming up, I could tell if it fit ok or not.. there is no movement after the distributor is locked in place so I could feel if that seemed ok for me..

normally there is some stretch but as you stretch them to fit them over things this also decreases the diameter and that may also affect fit.

The oil pump is very important and inaccessible and it is very important, so I'd try OEM unless you find yourself stuck in some strange circumstance.

it does ocurr where parts are machined and then some refitting needs to happen to compensate, bu t probably nothing like that would ever happen with an oil pump. if its worn it would be replaced.

probably you could choose one from a kit and continue but the risk is a bit high there so I'd go for the OEM one if you can. safer that way.

orings are generally quite inexpensive , I'll normally keep a kit onhand, but a large kit might be a few bucks.

I dont think what you are doing is very unusual, but I'd proceed with a bit of caution. going OEM is good advice. why look for trouble. Yes it is possible to get kits and refit new ones though. you can draw your own conclusions on what makes the best sense.

[wwdwgs]

Thanks, guys, for your inputs.
"Input. More input!"

[944 S2]

Still looking? I have some new Viton extras.

[wwdwgs]

944 S2, PM is sent.

[wwdwgs]

944 S2,
if the part number is the same as mentioned above, then yours should fit.
shoot me a email - "my screen name" at yahoo.com.
Edit:
This o-ring dim is (should be) 26mm x 3mm (ID x thickness). I think, I din't measure these o-rings.

[944 S2]

Originally Posted by wwdwgs

944 S2, PM is sent.

Got your message but got an error saying you can’t receive messages. Anyway mine were for a 91 S2. Is that what your looking for? The sizes are 2-013 and 2-014. Unfortunately they are often sold in packs of 10 which is why I have some left over. If you’re interested PM your email.