Need some help

[Rossi1492]

I have a 2011 A4 2.0t. Love the car but it keeps saying oil pressure low. I have replaced both oil pressure switches and the oil level sensor and also got a dipstick to check it manually. Just the other day it threw the code P0341(camshaft position sender). I just had the motor rebuilt due to a bad bearing on the main crank. My mechanic said he also put in a new oil pump and timing chain assembly.

[silver_tt]

Did you check the cam bridge screen?

[Rossi1492]

Did you check the cam bridge screen?

What’s that?

[Rossi1492]

Did you check the cam bridge screen?

I just googled it. I’ll ask the mechanic on Monday when I drop it off to him.

[Rossi1492]

Did you check the cam bridge screen?

Would a bad and broken screen possibly be the reason for the oil pressure problem?

[silver_tt]

It depends what happened to to screen and where it went. When mine was missing the first thing I did was looked for it (and found it just sitting in the oil gallery thank god). Could be balance shaft related. We have also seen some pretty obscure issues like there's a check valve between the block and the head, but that was one-off and the only time I have seen that.

Have you done any work to the car recently? Obviously need to see where the oil pressure problem is originating from and I always go back to what I was messing with last.

[Rossi1492]

It depends what happened to to screen and where it went. When mine was missing the first thing I did was looked for it (and found it just sitting in the oil gallery thank god). Could be balance shaft related. We have also seen some pretty obscure issues like there's a check valve between the block and the head, but that was one-off and the only time I have seen that.

Have you done any work to the car recently? Obviously need to see where the oil pressure problem is originating from and I always go back to what I was messing with last.

I did just have the engine rebuilt, due to a bad main bearing on cylinder 4. I have put about 2k miles on it since the rebuild. The oil level sensor that was replaced failed soon after and I I put about 1.5q to much oil and had some serious blow by and some serious smoke out the exhaust. My mechanic said no serious damage. He just change the bad sensor and cleaned out the oil the best he could.

[silver_tt]

Since you just did the rebuild due to a bad main bearing, it could be related. There could be too much clearance between the bearings and the crankshaft journals.

You know this now, but never put in that much oil at once. Max to min on this engine is 1 quart, you should never be adding that much at once.

[Rossi1492]

Since you just did the rebuild due to a bad main bearing, it could be related. There could be too much clearance between the bearings and the crankshaft journals.

You know this now, but never put in that much oil at once. Max to min on this engine is 1 quart, you should never be adding that much at once.

As far as the cam bridge goes and other parts needed should I get them straight from the dealership or is it ok to buy online OEM parts

[silver_tt]

Don't buy them from the dealership but buy them from a place like Audiusaparts.com that usually is not much more cost than aftermarket (will be way cheaper than walking into a dealer and paying MSRP). They are a real dealer, the largest in the country last I looked, and sell at a cost + fixed margin. Use your VIN when you checkout to be sure you get the right parts. Free shipping, no tax, and they have a code that gives you $50 off if you order $500 or more. I have been buying Porsche and Audi parts from them before they even had an internet webpage and you had to call your orders in.

I personally would replace the cam bride with the new OE as it has several revisions including a beefed up screen. Some people will tell you to rip the screen off but I didn't do that.

[Rossi1492]

Don't buy them from the dealership but buy them from a place like Audiusaparts.com that usually is not much more cost than aftermarket (will be way cheaper than walking into a dealer and paying MSRP). They are a real dealer, the largest in the country last I looked, and sell at a cost + fixed margin. Use your VIN when you checkout to be sure you get the right parts. Free shipping, no tax, and they have a code that gives you $50 off if you order $500 or more. I have been buying Porsche and Audi parts from them before they even had an internet webpage and you had to call your orders in.

I personally would replace the cam bride with the new OE as it has several revisions including a beefed up screen. Some people will tell you to rip the screen off but I didn't do that.

I can’t seem to find the cam bridge on that website. What is the actual name for that part?

[silver_tt]

For my 2014 CPMB it is: 06H-103-144-K

https://www.audiusaparts.com/oem-par...ket-06h103144k
(You can see the screen in the item picture)

When you checkout just be sure to put in your VIN and they will cross-check it to be sure it's right for your exact engine. If you somehow get the wrong part from them their guarantee pays for return shipping and replacing it free -- only happened to me once and it was because I put in the wrong part number but they missed it cross-checking it against my VIN and their guarantee replaced it for free no problem.

[Rossi1492]

Cool thanks. I did eventually find it. Same as yours. I think IÂ’m going to remove the screen though.

[silver_tt]

If you're going to rip the screen off anyway, why are you replacing the cam bridge? You can just rip the screen off of your existing one and call it a day, which is what most people do. Not what I did but if you're going to rip the screen off a new and improved cam bridge anyway.....

[Rossi1492]

If you're going to rip the screen off anyway, why are you replacing the cam bridge? You can just rip the screen off of your existing one and call it a day, which is what most people do. Not what I did but if you're going to rip the screen off a new and improved cam bridge anyway.....

Well I got it all apart and looks as though the screen has already been removed.

[Smac770]

Yeah, but was it removed before installation, or was it removed while the engine was running. :-)

[Rossi1492]

Yeah, but was it removed before installation, or was it removed while the engine was running. :-)

Yeah I did think about that. Looks like it removed before installing. There wasn’t the metal ring that presses in.

[Theiceman]

I think you guys may be on the wrong track on this one. I'm not sure how a screen on the head causes low oil pressure messages in the block where the oil pump and sender are.
There are two main culprits that cause low oil pressure messages on this engine.
1. A bad PCV creating excessive block vacuum which essentially pulls oil through the galleries dropping the pressure and giving the code.
2..bad balance shafts and balance shaft screens in the block

Certainly you can not ignore the fact crank work was just done and bad bearings and clearances can bleed off oil pressure. It just generally isn't an issue on this platform.

Bad check valve in the head and weird things gone wrong with the screen can certainly cause oil starvation in the head, but that is a different discussion as oil pressure is not monitored there .
Certain you can bleed pressure there also if there is damage to journals in the head, but not that common
First thing is stop shotgunning and measure the actual oil pressure i would say.

The question I have is why were you having the crank bearings serviced ?? That is insanely rare on this engine as the bottom end is solid. I hope you are not going to tell me he was doing this because of low oil pressure messages .

Sent from my SM-G973W using Audizine Forum mobile app

[silver_tt]

Mentioned it could be the balance shaft in post #6. I always go back to what I was working on last, usually it's related.

About not understanding the cam bridge screen, once it becomes detached there's no telling where it will end up. Hopefully it's just sitting there innocently in the oil gallery like mine was but certainly that's not always the case..........

[Theiceman]

Mentioned it could be the balance shaft in post #6. I always go back to what I was working on last, usually it's related.

About not understanding the cam bridge screen, once it becomes detached there's no telling where it will end up. Hopefully it's just sitting there innocently in the oil gallery like mine was but certainly that's not always the case..........

the scary part is if the guy before you removed it and put the cam bridge back .. that would drive me insane not knowing. lol.

[silver_tt]

haha I know, that would drive me crazy not knowing... part of the reason I bought my car CPO is knowing the history. Otherwise you never really know what the guy/guys who owned it before you did.... I read a lot of crazy sh1t that people think is OK to do

[Rossi1492]

It is definitely unsettling not knowing about the screen for sure. As far as the bottom end getting rebuilt, the mechanic said it was due to a bad bearing. And that’s all I really know. I will check the PCV when I get back in town. I am planning on taking it back to the mechanic then also. The first thing he said he was going to do was check the oil pressure and see what it is. I drove it the other day and the only time it said low oil pressure was when the RPMs were low or I was at idle. That made me think the PCV valve was malfunctioning but didn’t have time to check it.

[Theiceman]

Just because it's low at idle that has zero to with it being a PCV..
ALL low oil pressure issues show at idle. That is when it will show. But I would start with checking oil pressure.. then check crankcase vacuum at idle should be around 3 inches of vacuum I think.

Sent from my SM-G973W using Audizine Forum mobile app

[silver_tt]

This engine runs a vacuum of about 35" water. That would be about 2.57" mercury.

IMG_7358.jpg

[Smac770]

The white cap spec is 100 mbar, which is 2.95 inHg, or 40.2 inH₂O

[silver_tt]

Yes. However there is some variation if you measure at the oil cap it should be close to what I show in the picture. That pic was taken as a benchmark with a brand new OE PCV and taken with the engine hot after a long drive.

[Rossi1492]

So I have the PCV the good ol blow test and it seems to be working. However there was some oil in the breather hose. Is that normal? I should be dropping it off at my mechanics on Monday.

[silver_tt]

Ya There will be some oil in the hose that runs to the turbo inlet if that’s what you mean

[Rossi1492]

Ya There will be some oil in the hose that runs to the turbo inlet if that’s what you mean

The top hose that comes off the intake manifold to the PCV is what I’m talking about

[Smac770]

The fine oil separator + fresh air breather + positive crankcase vent (aka "the PCV") receives oily air from the engine, which it then does a last attempt to pull as much oil out of the air before passing it to either the intake manifold or the turbo inlet. It's not going to get all the oil out. So over time, you're going to end up with oil down both paths. Which for the path to the turbo inlet, means also down the intercooler and associated hoses. So pull either PCV hose, it's going to have an oily interior. Pull either hose off the intercooler, it's going to have some oil at the bottom.

[Rossi1492]

Sweet thanks for all the help guys. I’m a pretty mechanical guy, but new to the Audi and turbo world.

[Rossi1492]

https://www.dropbox.com/s/mum611t21efgulx/Photo%20Jul%2002%202022%2C%201%2046%2014%20PM.jpg? dl=0

[Rossi1492]

https://www.dropbox.com/s/mum611t21e...%20PM.jpg?dl=0