Good Deal on Exhaust Hub

[DropTopKingM3]

I sold my 71k mile exhaust hub on here for about the same price. Members of the Facebook group were trying to tell me mileage didn’t matter and that a hub was a hub lol 🤦♂️

[mrgizmo04]

Not to confuse the issues, Beisan issue was with the oil pump disc, where the 4 holes on the outer circumference of the disc were too large for the plungers to generate the correct pressure. The issue was not with the hub, nor the 2 holes on the inner lateral face of the disc where the hub tabs meet the disc.

Hub tab breaking has 2 solutions - smaller holes or larger tabs. Hub can be reused if a new/redrilled disc is used where the 2 holes on the inner disc surface are smaller than original so the tabs don't bang around. Conversely, same disc can be reused (not redrilled) if a hub with larger tabs is used (ala turbotoy).

Redrilled discs have different tolerances between cars for the 4 plunger holes, so it is better to have your disc redrilled for the 2 new hub tab holes so you can reuse your plungers to create the correct pressure. Otherwise it's a gamble on whether your plungers mated with the (new to you redrilled disc from a random core return) disc will work properly.

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[dl.m3]

I say if your OE hub is intact and you inspect it the best you can for any microfractures, it's better to re-use it.

I trust BMW qa/qc and machine work over aftermarket god-knows where/how its made hubs that probably weren't tested before retailing.

Mind you the flaw was never the hub, it's the oversized holes in the disc.

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[02_lsb]

Ok. So, no forum member documented OE Hub failures post redrilled OE Disk install.

ill reach out to Kassel and another local Indy next week.

[George Hill]

It's been maybe 1yr +/- but I asked Raj if he had any documented tab failures on ANY re-drilled disk and he said he had never seen one.

[02_lsb]

That’s pretty much the gist I got from Raj and Kassel (coyne performance at the time), but also a couple years ago.

[Cubieman]

Not to confuse the issues, Beisan issue was with the oil pump disc, where the 4 holes on the outer circumference of the disc were too large for the plungers to generate the correct pressure. The issue was not with the hub, nor the 2 holes on the inner lateral face of the disc where the hub tabs meet the disc.

Hub tab breaking has 2 solutions - smaller holes or larger tabs. Hub can be reused if a new/redrilled disc is used where the 2 holes on the inner disc surface are smaller than original so the tabs don't bang around. Conversely, same disc can be reused (not redrilled) if a hub with larger tabs is used (ala turbotoy).

Redrilled discs have different tolerances between cars for the 4 plunger holes, so it is better to have your disc redrilled for the 2 new hub tab holes so you can reuse your plungers to create the correct pressure. Otherwise it's a gamble on whether your plungers mated with the (new to you redrilled disc from a random core return) disc will work properly.

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I did have a distinct and different issue with the aftermarket disc, it wasn't the plunger holes but the inner diameter, it didn't fit as tightly around the shaft as the OE disc. I could place the OE disc on the top portion of the shaft and it would slowly slide down with gravity whereas the aftermarket disc you could feel wasn't as tight and when it was placed onto the shaft it would immediately drop down shaft with no resistance.

I agree, always reuse YOUR vehicles pump disc, even if it means spending extra time finding the right machine shop.

[bmw m3 s50]

I had an issue with the inner diameter of the Beisan disc being a too large causing insufficient oil pressure, thus failing a vanos oil test/oil pressure test (40bar vs 100bar).
Raj was very nice about it, he told me the issues with my disc (once returned and analyzed) and refunded not only the money for the disc but my entire purchase, chain guide, seals, pack etc.
It wasn't great to have to take it all apart again but shit happens. I was sent an OE re-drilled disc and everything worked as it should.

Wow, I am not sure how I missed this and even that thread. My heart sank when first reading the comments. I bought the beisan vanos lockdown kit back at the end of 2018 and did the vanos lockdown at the beginning of 2019. I had a BMW tech do the work as a side job, which he said everything turned out fine. I did have the exhaust hub fail with damaged tabs and I ended up replacing the exhaust hub with an OEM used one along with the rest of the Beisan kit. I have been driving the car since 2019 without any issues. My guess everything turned out fine and that if there was a failure it would have occurred right at the install. I do have ISTA and will run a VANOS test to see what kind of readings the vanos is getting.

Question, if the oil disc has been fine thus far and the car has not had any problems since 2019, should there be reason for concern that future failure could happen due to possible improper tolerances in the oil disc? Would improper tolerances in the oil disc cause possible failure in the future due to use or strain being put on the vanos system?

[02_lsb]

If you used an OE exhaust hub and your disk was OE redrilled unit — you’re fine.

[bmw m3 s50]

If you used an OE exhaust hub and your disk was OE redrilled unit — you’re fine.

That is the problem, I do not know if the disk used was an OE redrilled unit or the aftermarket one. I didn't even think to check at the time because I didn't even know that was a thing.

[02_lsb]

That is the problem, I do not know if the disk used was an OE redrilled unit or the aftermarket one. I didn't even think to check at the time because I didn't even know that was a thing.

check your receipt from beisan.

[bmw m3 s50]

check your receipt from beisan.

Receipt just says: s54 vanos oil pump disk (Item No. BS025) for $450.

Would this mean that it was an OEM disk? Are the aftermarket ones billed differently?

[02_lsb]

Receipt just says: s54 vanos oil pump disk (Item No. BS025) for $450.

Would this mean that it was an OEM disk? Are the aftermarket ones billed differently?

I just checked my receipt (from 2017), item number is the same. Raj is a pretty awesome guy, I’d email him to verify if you’re not sure.

[jet_dogg]

Wow, I am not sure how I missed this and even that thread. My heart sank when first reading the comments. I bought the beisan vanos lockdown kit back at the end of 2018 and did the vanos lockdown at the beginning of 2019. I had a BMW tech do the work as a side job, which he said everything turned out fine. I did have the exhaust hub fail with damaged tabs and I ended up replacing the exhaust hub with an OEM used one along with the rest of the Beisan kit. I have been driving the car since 2019 without any issues. My guess everything turned out fine and that if there was a failure it would have occurred right at the install. I do have ISTA and will run a VANOS test to see what kind of readings the vanos is getting.

Question, if the oil disc has been fine thus far and the car has not had any problems since 2019, should there be reason for concern that future failure could happen due to possible improper tolerances in the oil disc? Would improper tolerances in the oil disc cause possible failure in the future due to use or strain being put on the vanos system?

Here's the thread on the faulty beisan billet oil pump disc-

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/88778-failed-vanos-test-post-beisan