Hello everyone. I've already introduced myself in the newbie forum with my 1980 Omega Brougham sedan.

After a total of 8 weeks in the workshop, the car has been perfectly prepared. Inside and out, it looks very good again, almost like new. It shifts smoothly again, and the chassis is completely new, too. Truly wonderful.

But on Friday, when I picked it up and drove 20-30 miles, the oil pressure suddenly disappeared. The oil pump drive shaft is round instead of hexagonal. The workshop sent me a photo and has already removed the pump. What's the best way to fix this?

Do you have better contacts for spare parts dealers in the USA? My workshop in Switzerland is well-connected, but finding parts for this car is extremely difficult. Or do I have to have the shaft remade? Obviously, I also need a new oil pan gasket.







Thank you very much for your help!

 

Where are you located? Are you easily able to order from suppliers like Summit?

Milodon makes a hardened shaft for the Olds which is pretty nice and fairly easy to get - part 22575. You can also use a plain stock style which is just a length of hex shaft. The Melling IS-22F is a stock-style replacement. All of the oil pump drives for Olds are identical. Note that when you search "Oldsmobile" you'll also get results for Chevy engines because Olds started using Chevy engines. You don't actually need the retainer clip. That goes between the pump and the block to keep the shaft in the engine block when removing the distributor. It's pretty common for the shaft to get wedged into the pump and/or into the distributor gear as the hex starts to wear down. The clip can make it pretty annoying to remove the distributor, but it ensure you don't accidentally partially remove the shaft and then drop it into the engine.

Oil pan gaskets are also universal for all Olds v8 (65 and later) engines. The Fel-Pro "OS 30471 C" is officially for the diesel engine, but works perfectly on all of the v8's. It has a metal core with cork lining and generally works really well.

 

Iron Duke or 2.8 V6?

 

I have a used original OEM GM Oldsmobile oil pump shaft removed from my 1971 350 in case you can't find/buy one. Excellent condition. You can have it free - you pay shipping. I think you reside in Switzerland?

 

2.8 V6 with manual transmission.

Thank you all so far!

 

Does it fit with my Model? 2.8 V6 Engine. I will quickly ask my mechanic if this Part would fit and would reach out to you for the Details if this would be the Part in question. Thank you!!

 

I have no reason to doubt oddball who likely has far more experience than myself. Anyways, if it will help you out let me know.

 

I sent this to my mechanic as well! Thank you very very much guys!

 

The 1980 Omega is a FWD X-car that doesn't use an Olds motor.

 

Don't as this won't fit your engine.

 

Go back and re-read the part where he has a 1980 FWD Omega with the Chevy 2.8 60 degree V6

 

Thanks, Joe. Great input. I definitely have no history of anything Omega.

 

Hey Joe - In fairness, I believe it is you who needs to go back & re-read the part where he stated he has a 1980 FWD Omega with the Chevy 2.8 60 degree which was posted (NOTE) AFTER oddball's post.

 

The first post says that it's a 1980 Omega, which is the FWD X-car. I asked if it was an Iron Duke or 2.8 V6 and he responded to my question.

 

Hey, that's why I said Olds v8 ¯\_(ツ)_/¯
I don't know what the v6 Chevy uses, sorry. I should have realized that flange wasn't an Olds flange, but I saw the hex end and just ran with it.
If you can't find a specific shaft then it may just be a standard hex shaft - likely 5/16".

A few quick searches implies it is just a plain hex shaft, so if you can find hex bar stock in the right size then just cut it to length. It looks like there's a recess cut into the shaft but I doubt that's important. I *think* there's a little plastic umbrella - looks like it's stuck to your pump - that sits on that groove and .... I'm not sure what it's supposed to do. Prevent oil from squirting up along where the shaft exits the pump from spraying up to the distributor? I have no idea.

Melling IS-95 is the correct part for that engine.

 

I just want to add that the shaft almost certainly rounded off because something got in the pump and seized it up. Make sure they take the pump apart and see what happened and if you are going to order a shaft you might as well get the pump also.

If you post the VIN I can tell you what part numbers to order.

 

The plastic umbrella serves the same purpose as the metal clip on the V-8 shafts. It keeps the shaft from pulling out of the oil pump. It actually is a "press" fit and holds the shaft in place.

 

Hello again everyone

First of all, thank you all very much for your fast help!

The good part: I learned a lot again about my (grandparents..) car. So basically the 2.8 V6 is the exact same engine as used in the early Pontiac Fiero. So getting a new oil pump including the drive shaft and sealing etc. was not only easy but cheap as well.

According to my mechanic the bearings have not suffered any damage. The material thickness is still within normal limits. None of the bearings have worn in (at least the visible ones), so everything should be fine.

They also installed a new cork gasket for the oil pan. The old one was completely ruined. GM should be forgiven after 45 years; it's a miracle that the oil pump has survived this long. That's why I love your (old !) cars so much. Good old US steel. In a European car, all of this would have been replaced three times since the '80s, especially in Italian cars, as beautiful as they are... I speak from experience!

Before / After photos of the interior will follow within another thread. I did not have the time unfortunatley.

Thank you all once again and have a nice weekend. :-)