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 6th valve, 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 number 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 the 3rd cylinder is worn. Is this a design flaw?

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

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

Hello,

Is the packing in the valve stem shaft still in place and sealing properly? If not, the oil pressure will be lost there.

Best regards, Rainer.

Hello,

Is the packing in the valve stem shaft still in place and sealing properly? If not, the oil pressure will be lost there.

Best regards, Rainer

Da ist ein Stopfen ? I didn't know that.
I just checked 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.

Idle speed: 1 bar.

3 bar at 2000 revolutions.

4.8 bar at 3000 revolutions per minute.

It seems everything is alright, or is it?

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 like I posted too soon, but the oil pressure seems to be okay!

Best regards, Rainer.

/viewtopic.php?t=21918

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 like I posted too soon, but the oil pressure seems to be okay!

Best regards, Rainer

Have I understood correctly? If the oil pressure is correct, then it can't be the case that the plug on the rocker arm is missing, right? Or could it be that it fell off anyway and is 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 a helper, without the cylinder head cover. You can put something around it to catch any oil splatters so they don't make too much of a mess.

If no oil is reaching the camshaft, 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 is only temporarily low, which could have caused the problems in the cylinder head.

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

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

Best regards, Rainer

I was also thinking 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, oil is definitely present. It's possible that not enough oil is reaching the area. I can't shake the thought that the new camshaft might simply be poorly hardened. In most of the cases I've found online, the 6th lobe is affected, just like in mine. So, it seems that, for some reason, the lobe wears out first, possibly due to a design flaw. 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?

Hello everyone,

Before we start speculating about the camshaft bearings... What kind of oil was used? Specifically, what specification/approval does it meet? And what is its viscosity in the warm operating range? It's possible that the oil was too thin to provide adequate lubrication at 100 degrees Celsius.

Hello everyone,

Before we talk about the durability of the camshaft lobes... What oil was used? Specifically, what specification/approval does it have? And what is the viscosity in the WARM range? It's possible that the oil was too thin to provide sufficient lubrication at 100 degrees Celsius.

I have Castrol Edge 5w30 LL in it.

Well, some people pay for oil, while others pay for brand names... I would focus on the oil supply.

Your picture of the canister is nice, but completely pointless. Why don't you just read the label to see if it meets the required VW standards?

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

"LG" is an abbreviation for "Liebe Grüße," which means "Best regards" or "Best wishes" in English.

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.

'Hi, I removed the cylinder head yesterday and took everything off except for the valves. Today, I installed the valves and valve stem seals. Everything looks very verschandeln so far. There are some residues, but compared to other pictures I've seen, it's quite clean. I believe the cylinder head itself is actually in very good condition. How can I thoroughly verschandeln the cylinder head to remove all residues, including from the channels? In the meantime, the online shop contacted me. They also suspect a material defect due to the low mileage. They want to send me a new part, and the old parts will be inspected by the manufacturer. If it's a material defect, I'll get a refund for the purchase price. Let's see what happens.'

Hi,
Okay, I'll phrase it with question marks - the lubrication of the camshaft and the bearing surface is achieved through oil that is forced out of the bore around the hydraulic lifter (and through oil mist above the cylinder head). Therefore, I would focus on the oil channels in the cylinder head, specifically in that area.
hg
Herbert.

Hello, can anyone tell me which holes are responsible for the oil supply? I've been blasting compressed air into everything, but no air is coming through. When I apply compressed air from the top into the small holes, it comes out through the small holes on the other cylinders. But it doesn't come out on the bottom. Does anyone know which holes are for the oil supply?