When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Cannot dig out the information although I have searched around including the tech bulletin.
I am going to be changing my oil cooler seals this weekend on my 1986 944 turbo. my question is, will the early alignment tool for the early engines still work even if I have an updated the OPRV? It's confusing because I can't tell if the other alignment tool is chosen based on the newer engines or if it's for the newer OPRVs. Some sources dictate the tool based on the year of the car, while others seem to refer to the style of the OPRV only.
Of course, I ordered the alignment tool for the 3-piece OPRV, which came stock in my car. However, upon inspecting my service records, I found that the OPRV was replaced back in 1994 but I don't know if they updated the OPRV to the 1-piece unit. They probably did, being well after the OPRV was updated, right?
Second question i have is about the rubber seal for the OPRV, which I forgot to order because it doesn't come in the kits. I have the crush washer for it, but will I need to replace that rubber seal and if so is it not possible to safely use a hardware store oil seal?
I came across some information that the 3-piece units don't have a rubber seal, but not sure about it.
The alignment tool for a pre-87 car should work regardless of the OPRV you have installed...it's just there to center the console so the OPRV won't bind. The bore inner diameter isn't dependent on the OPRV. It's the 87+ models that have a revised setup.
The alignment tool for a pre-87 car should work regardless of the OPRV you have installed...it's just there to center the console so the OPRV won't bind. The bore inner diameter isn't dependent on the OPRV. It's the 87+ models that have a revised setup.
Ahhh thanks Michael, that's what I was thinking / hoping.
I guess my only question now is about the rubber seal on the OPRV which i might need to source locally so i can finish the job this weekend.
But does the 3-piece OPRV have a rubber seal?
Is it not okay to use a hardware store rubber oil seal?
No seals on the 3-piece... it's just the piston, spring, and the threaded plug. The piston is a very tight fit to the bore. The retrofit part does have a rubber seal though... it moves along the bore... Don't think a hardware store part would work well. Could fail and cause serious damage.
Thank you. great info.
This is a tough one to answer but if my OPRV was replaced by a non-Porsche-specific mechanic in 1994, do you think the 1-piece was installed?
If so, I will need to find the proper seal and hopefully not use the old seal.
Thanks again and wish me luck, I am dreading getting those oil cooler hoses off.
My 83 has the 3 piece oprv and a Allen wrench is needed to remove it. All the pictures of the 1 piece oprv I've seen is a regular hex head. This may be a good way to identify which oprv you have before taking things apart.
Last edited by marc abrams; 03-24-2016 at 10:29 PM.
That's a nice write up. HOWEVER I would suggest adding:
1) Turbo cars need fewer seals than the NA cars. Turbos only need the main gasket and two 999-707-043-40. This is not including the OPRV.
2) I would also clarify that the alignment tool you need depends on the year of the block, not the style of OPRV.
3) However, since some cars had their OPRV updated, it would also be useful to note that you can tell which style you have without taking any parts off. You have a two-piece unit if the head is 17mm -- the unit is a one-piece if the head is 24mm.
4) It might also be useful to note that the one-piece OPRV uses a crush washer and an o-ring ( 999-707-145-40 ), while I'm almost certain the 3-piece OPRV uses no washer or o-ring at all.
While I was doing research for this job, these were the issues that I had trouble resolving. Unfortunately, this can be very confusing to someone who has never done the job.
For the record, on my turbo I did not need to unbolt the exhaust manifold. And even though I did lower the sway bar, I don't think it was necessary.
Good luck to anyone reading this ahead of the oil cooler job.
I cannot confirm if those measurements are correct, but I am currently looking for a later style tool and if we can find measurements for those, I may get some quotes from some machine shops I work with to turn out a few. Should be a fairly simple job.
03-24-2016, 04:05 PM
Alignment Tool for Oil Pressure Relief Valve
