Oil pressure dropping to 1 bar at 2500 RPM on a 1.6L TDI CAYC engine

Hello, I'm having a problem.
Our Audi suddenly lost almost all of its oil pressure.
The Hydros are already starting to make noise.
Now I've installed an oil pressure gauge.
At idle, the oil pressure was 1.2 bar, but when you accelerate, the oil pressure drops to 1 bar at 2500 RPM.
Does anyone have any idea what this could be?

In another thread, I also read about a faulty balance shaft in some Audi engines. This shaft, which drives the oil pump via a belt (similar to our 1.6 TDI), can fail, resulting in a loss of oil pressure.

Can this be the same?
Thank you for your help.
VG Chris.

I'm not sure about this, but the oil pump might be driven by a timing belt. Perhaps the belt has a missing tooth. If so, what kind of oil are you using?

Hi,
According to the SSP442 document, the oil pump in the CAYC is driven by a timing belt connected to the crankshaft.
Are the oil pan and oil filter free? It's possible that the pressure inside the pump is high enough to actuate the control valve, but something (like a check valve, oil cooler, or oil filter) is preventing the pressure from building up outside the oil pump. Perhaps the valve spring is weak, causing the valve to open too early.
hg
Herbert.

Thank you for the information. The oil change was done 3 weeks prior with 5W30 Longlife oil.
I had already removed the oil filter before. It looked inconspicuous.
I could put a new one in, if you like.
If that's not the problem, I'll have to remove the oil pan.

Best regards, Chris.

I can hardly bring myself to write this, but the intake manifold was almost completely blocked.
Since the engine is also experiencing water loss, it will now be removed.
Two years ago, I had the cylinder head gasket replaced, but after 2-3 months, it started leaking water again.
Today, I noticed pink-colored droplets suddenly coming out from the bottom of the engine.
I think the engine is finished, who knows if it also suffered damage due to the insufficient oil pressure .
Best regards, Chris.

Take a look at which head version is installed; they tend to be more prone to defects. And also check the connecting rod bearings; if everything looks normal there, it means they weren't affected by the oil pressure issue.

Where can I identify which version is installed by looking at the cylinder head?

I had the cylinder head professionally cleaned and resurfaced by a specialist engine rebuilder.

Best regards, Chris.

In the area behind the turbo, there is a number cast into the metal, either "V 300" or "V???". Do you need a mirror so you can see it?

Thank you. So, if a V300 or Vxxx is molded into the part, should I avoid it?
I cleaned the intake manifold with diesel today.
Unfortunately, metal flakes were also found, which means the final decision has been made to install a different engine!

Ales under V300 should be replaced if there is unexplained water loss.

Thank you very much, but I need to ask a few more questions.

If a motor is rated below V300, should I avoid using it?

It's not necessarily the case, but it's possible that these components are defective.

Thank you again!

I've now found an engine from 2015 with a V300 cylinder head!

Best regards, Chris.

PS: The old one was a V270 model from 2010.

Thank you for the feedback .