Camshaft Wear: New Part Failed Quickly?

Hello, I'm having a problem with my Audi A4 B7 2.0 TDI (BPW) where the old camshaft was worn down on the valve #6, specifically the tip was gone. So, I replaced all the lifters, all the bearing shells, all the screws, and the camshaft with new parts from Kolbenschmidt. However, I just couldn't shake the feeling that something else might be wrong with the engine. So, I removed the valve cover, and what do you know? The cam lobe and lifter #6 show clear signs of scratching. What's curious is that I've looked at several similar cases, and almost always the cam lobe on cylinder #3 is worn. Is this a design flaw?

Does anyone have any ideas what the problem might be? Could it possibly be a valve issue? The lifter looks like it's being crushed between the valve and the camshaft lobe.

Before I start tearing things apart, I'd like to measure the oil pressure at the location of the oil pressure sensor first. Does anyone know what values I should expect under different conditions?

Hello,

Is the stopper still in place and sealing within the valve stem? If not, that's where your oil pressure is leaking out.

Best regards, Rainer.

Hello,

Is the stopper still in place and sealing within the valve stem? If not, that's where your oil pressure is leaking out.

Best regards, Rainer

Da ist ein Stopfen ? I didn't know that.
I just measured the oil pressure at the location of the oil pressure sensor while the engine was warm, specifically at 90 degrees Celsius.
The oil truck is in the...

Idle speed: 1 bar.

At 2000 revolutions per minute, the pressure is 3 bar.

At 3000 revolutions per minute (RPM), the pressure is 4.8 bar.

It seems everything is alright, or am I wrong?

I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.

Let's also check if the oil pressure increases appropriately at high engine speeds. How is the oil pump driven in your engine? Could something slip like with the hexagonal drive connected to the balancer shafts?
Edit: Seems I posted this too soon; the oil pressure appears to be okay!

Best regards, Rainer.

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Let's also check if the oil pressure increases appropriately at high engine speeds. How is the oil pump driven in your engine? Could something slip like with the hexagonal drive connected to the balancer shafts?
Edit: Seems I posted this too soon; the oil pressure appears to be okay!

Best regards, Rainer

Have I understood correctly? If the oil pressure is correct, then it can't be that the stopper on the rocker arm is missing, right? Or could it still have fallen off and be related to this issue?

'People, the camshaft has gray marks and fine scratches on almost every lobe. Could this possibly be due to poor material quality?'

Try starting the engine briefly with an assistant, without the cylinder head cover. You can put something around it to catch any oil splatters and prevent a big mess.

If no oil is reaching the camshaft at all, then you've found the cause.

Best regards, Rainer.

I would start by checking the hexagon socket head cap screw on the oil pump and replacing it immediately. It's quite possible that the oil pressure was temporarily too low, which could have caused the problems in the cylinder head.

Try starting the engine briefly with an assistant, without the cylinder head cover. You can put something around it to prevent oil splatters from making too much of a mess.

If no oil is reaching the camshaft at all, then you've found the cause.

Best regards, Rainer

I thought the same thing. However, I've already removed the timing belt, camshaft, vacuum pump, etc. The fact is, when I removed the camshaft, there was oil in all the bearing journals. So, it seems like oil is actually getting to those areas. It's just possible that not enough oil is reaching them. I can't shake the feeling that the new camshaft might simply be poorly hardened. In most of the cases I found online, the 6th cam lobe is affected, which is exactly what happened in my case. So, it seems like there's a design flaw that causes the cam lobe to wear out prematurely for some reason. I'm wondering what would happen if the new shaft is so poorly made that it wears out immediately. Then there's the question of the bearing shells. I've been told that it's normal for them to look like mine after a short time. They say that with insufficient lubrication, proper grooves would form. Do you think there's any truth to that?

Hallo zusammen,

bevor auf der Festigkeit der Nocken rumgeritten wird... Welches Öl wurde verwendet? Also welche Spezifikation/Freigabe? und welche Viskosität im WARMbereich. Könnte sein, dass die Plörre zu flüssig war um bei 100 Grad noch ausreichend Schmierung zu gewährleisten.

Hallo zusammen,

bevor auf der Festigkeit der Nocken rumgeritten wird... Welches Öl wurde verwendet? Also welche Spezifikation/Freigabe? und welche Viskosität im WARMbereich. Könnte sein, dass die Plörre zu flüssig war um bei 100 Grad noch ausreichend Schmierung zu gewährleisten.

Ich habe das Castrol Edge 5w30 LL drinn.

Naja, manche zahlen halt für Öl und andere für Markennamen... ich würde mich auf die Ölversorgung konzentrieren.

Dein Kanisterbild ist nett aber vollkommen sinnlos, warum liest Du nicht einfach den Aufkleber, ob die geforderten VW-Normen darauf stehen?

Sure, here is the translation of the text from German to English:

"LG" translates to "Best regards" or "Sincerely" in English. It is a common abbreviation used at the end of emails and letters.

Hello,

The uploaded product image of the canister looks like it was copied from a website, so I have removed it. Please be mindful of copyrights.
I agree with the previous poster.

Best regards, Rainer.

[Translating...]Hallo, habe gestern den Kopf abgenommen, alles bis auf die Ventile vom Kopf entfernt. Heute sind die Ventile und Ventilschaftdixhtungen dran. Das sieht alles eigentlich sehr sauber aus. Etwas Rückstände aber im Vergleich zu anderen Bildern die ich gesehen habe, ist das sehr sauber. Ich glaube der Kopf hat wirklich überhaupt nichts. Wie kann ich den Kopf möglichst tiefenrein sauber machen ? So das sich alle Rückstände sich auch von den Kanälen lösen ? In der Zwischenzeit hat sich der Onlineshop bei mir gemeldet. Die gehen auch davon aus das es sich bei so wenig km um Materialfehler handelt. Soll mir etwas neues holen, die alten Teile werden dann vom Hersteller geprüft, wenn es ein Fehler des Materials ist bekomme ich dann den Kaufbetrag zurück. Mal schauen was sich ergibt.

Moin,
ich schreibe es mal mit Fragezeichen - die Schmierung des Nockens und der Lauffläche läuft doch über Öl, das in der Bohrung um den Hydrostößel herausgedrückt wird (und durch Ölnebel über dem ZK). Ich würde deshalb hier ansetzen, also an den Ölkanälen im ZK speziell an der Stelle.
hg
Herbert

[Translating...]Hallo, kann mir jemand sagen welche Löcher für Öl zuständig sind. Ich habe überall Druckluft rein gehauen, aber da kommt einfach keine Luft durch. Wenn ich von oben in die kleinen Löcher Luftdruck gebe, kommen die bei den anderen Zylindern an den kleinen Löchern raus. Aber nicht auf der Unterseite. Weis jemand welche Löcher für die Ölversorgung sind ?