Erkennt man einen Haarriss im Abgaskrümmer? | Posts 16+

Hi,
No, not a deduction of points, but rather an acknowledgement of what went wrong, and an admission of their own mistake (which is rare).

I'm rooting for you.
hg
Herbert.

Unfortunately, the problem persists... the gasket on the diesel pump is new, and the oily issue hasn't changed.

I have now removed the valve cover from the old BLS engine, as it was still in relatively good condition, and installed it on this engine. I'll observe that again with this.
Actually, I had already replaced the valve cover gasket to rule that out. Perhaps the crankcase ventilation system isn't working 100% with the old valve cover. It wasn't an original VW product! Manufacturer: Topran.

If it starts leaking again, then I'm at a loss.


I will post one or two photos next time!

P.S.: What should I do next if it doesn't seal properly? It feels like I'm just experimenting at the moment...

Quote:

If it starts leaking oil again,

then I don't know what to do anymore.

Did you seal the joints between the cylinder head and the camshaft bearing supports during assembly? Apply a small amount of silicone sealant to the cylinder head at each of the four joints, in the corners. You can also apply a thin layer of silicone sealant to the curved surfaces of the valve cover, to prevent the gasket from being pulled upwards during assembly. After that, wait a few hours before starting it up.

The sealing surfaces were meticulously degreased, silicone was applied to the camshaft bearing interfaces, and the bolts were tightened in three stages according to specifications to 10-11 Nm. And yes, it has also been maintained.

I haven't installed this lid for the first time either.

I'm going to be driving almost 1000 km today. We will see about that later.

I had warped valve covers from both AVF and BKC, but replacing them with new ones solved the problem.

After 900 km on the highway, the used but original VW valve cover is sealing properly.

Then the new old valve cover probably never fit perfectly in the first place. Is this an exception? I purchased it from a large supplier that provides parts to many automotive workshops.

"I also suspected the turbocharger manifold. A few years ago, I already asked here why there was oil around the turbocharger. At that time, it had also started to leak towards the engine, and it was leaking in the same spot as it is now. Back then, the turbocharger channels were also slightly damp when the engine was briefly run in a cold state. After resealing it, the area behind the engine was dry. That was my thought. However, with this engine, the channels have always been dry so far." Probably, with the old engine back then, it was the start of the valve stem seals failing.

Here are two more pictures. In this one, the engine was already partially cleaned, but as you can see from the arrows, the fluid was slowly dripping down. It seems to only happen after the engine has been running for a while. The exhaust manifold itself was never wet. It was always only between the exhaust manifold and the engine. Wherever I touched with my fingers or the light, the valve cover gasket seemed to be sealing properly...

Could I have taken a better approach? - Yes, I should have just bought the original product.

Autoservice wrote:

Quote: If it starts leaking oil again, then I don't know what to do anymore. On the curved section, you can also thinly apply silicone sealant to the VDD to prevent the seal from being pulled upwards during assembly.

I've never done that before!

Actually, extremely distorted.
Of course, I could have checked that earlier, before the second assembly.