We know the distributor O-ring is a bad source of leaks as they harden with age and crack.
Unfortunately, when you ask for a Fiero distributor O-ring, you get the same crap Buna-N black O-ring.



What you want is the better tan colored Viton O-ring which stands up to engine heat better.
The problem is the parts guy can't find the thing "for the Fiero".

Later year V6 engines with DIS systems didn't have a distributor, but they still had a geared drive
in the distributor's place to drive the oil pump. These later applications have the Viton O-ring available.

What you need to ask for the the O-ring for the Oil Pump Drive Gear.
Sometimes they call it a Seal and maybe Oil Pump Drive Gasket (see example)
https://www.gmpartsgiant.co...m-seal-10477565.html

ACDELCO Part # 10477565 https://www.rockauto.com/en/moreinfo.php?pk=96261

Fel-Pro Part # 704841 https://www.jegs.com/webapp...Cmd?q=fel-pro+704841

NAPA's Part # is 655-1294. https://www.napaonline.com/en/p/NOE6551294

You will find them in "Help" packages as well.
Dorman PN 90441 - Distributor O-Ring Assortment
https://www.dormanproducts.com/p-45522-90441.aspx

For "insurance" I also use a Felpro distributor base gasket (thanks for the pic Schurkey)



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[This message has been edited by fierosound (edited 07-06-2025).]

Rodney Dickman also sells an improved distributor o ring. Once I replaced the factory o ring with Rdney's upgraded replacement, no more oil leakage at that location. This has been running for several years now so there is some long term experience.

Nelson

Cool picture. I've had to replace a couple of those back when I had my Beretta - that little stub is tough to get a grip on and pull out! At least with a distributor, there's a big metal piece to grab...

Thanks, Fierosound. I never even thought about this but now I can fix it. I wish this was the only leak I have, but both valve cover gaskets are shot, and some of the hoses connected to the intake manifold are shot. I figured that since I am retired and need a winter project, why not pull the whole thing. Now I am looking into doing a mild build if such parts are available for the 2.8. If not, I will look into replacing the 2.8 with something that has a few more horses. Any recommendations are welcome. I am quite adept at car mods. I put a 280Z engine in a 530i. It wasn't bad at all.

If you or others suggest that maybe I should just swap out the engine and drop another larger one in the cradle, please do so and supply any info/hidden problems that can help me. Thanks...

Looks like I'll be pulling my dist. out again to replace with better ring. lol.

One year ago, 02/2020, I replaced my dist. with a Delco reman. Came with the standard black ring. Last week, 3,200 miles later...oil leaking everywhere. Only replacement I could find was another black ring. ya, I'm not doing this again next year

quote Originally posted by donuteater306: Looks like I'll be pulling my dist. out again to replace with better ring. lol. One year ago, 02/2020, I replaced my dist. with a Delco reman. Came with the standard black ring. Last week, 3,200 miles later...oil leaking everywhere. Only replacement I could find was another black ring. ya, I'm not doing this again next year

As noted, *also* do the paper gasket under the dizzy. Besides a little extra sealing protection, IMO it shims the dizzy against the drive.

-- A