pressure relief valve

[egp320i]

My thought is this valve should not open to release pressure until a certain oil pressure bar wise has went over the limit. The left side is dry but the right side is wet. I can only assume sludge buildup is raising the pressure in one of the banks. I bought a new valve in case it is simply defective but it might make no difference. Ironically the right side with the open valve is quiet whereas the left is noisy. Any thoughts?

[upallnight]

Left side is noisy because you don't have oil for the hydraulic tappets so they are ticking.

What pressure valve are you talking about?

Wouldn't the pcv hoses at the rear of the valve cover prevent the inside of the valve cover from being pressurized?

I thought everyone left Audi World and only post on Quattroworld?

[egp320i]

Some left, some are at both like I am.

The rear vent tub is not blocked, I did a very good cleaning.

The valve is the one in the picture with oil dribbling out, one per side.

The valve is smaller then a dime in size.

From what I can tell it is a simple ball and spring, when pressure builds too much it pushes the ball up and it opens.

I never knew how much sludge was in this motor until I replaced the valve cover gaskets last fall when they were leaking [original].

The engine used to be quite but not at the moment.

Best course of action is to run seafoam or other cleaners to try and relieve the pressure and/or replace the valve to determine if it is not faulty.

Was looking for feedback, BTDT from anybody who looked into this themselves.

[upallnight]

The hole with the oil oozing out is the oil hole for the CAM. Are you sure it a valve and not just a restrictor for the opening from the oil passageway?

I would look into the other side where you don't have oil oozing out as something is clogged and preventing the oil from going up into the CAM. That is why that side is making noise.

[egp320i]

Negative, each cam has two holes under each lobe that are oil jets, the valve in question is the pressure relief valve.
It is clearly in Bentley and it notes if a loud noise in across the bank to first check if this valve is loose and if so to replace or simply replace it.

That is basically all they say.

I have not found a concrete answer but simple suggestion is the valve should not be open unless pressure in that bank has exceeded what it opens at.

What puzzles me is the leaking side is quiet whereas the noisy side is dry, that is the opposite of what should be happening.

[upallnight]

Bentley has been known to be WRONG.

On my Twincam Lotus Europa head, there is a restrictor inserted in the head to prevent a whole lot of oil from being pumped up to the head. The lifters are solid lifters so the oil is not used as in our hydraulic lifters, but oil is still need to lube the cups for the lifters and the surfaces between the cam and lifter.

[egp320i]

As the factory manual I highly doubt anything is wrong, known example?

Under each cam lobe are two oil ports so the lob hitting the lifter is constantly bathed in fresh oil.
One just has to see a picture of a cleaned head minus the cam to see the oil ports.

The valve I posted about has nothing to do with it, it is simply a check valve designed to open at a certain bar pressure.

This valve will open if you added too much oil and the pressure went over spec.

Probably not a common replacement but the valve could be gunked up to the point it gets stuck open when it should not be or even the opposite, baked oil blocking the entry not allowing it to open up.

When the weather breaks I will look into this further.

[upallnight]

Originally Posted by egp320i

As the factory manual I highly doubt anything is wrong, known example?

Under each cam lobe are two oil ports so the lob hitting the lifter is constantly bathed in fresh oil.
One just has to see a picture of a cleaned head minus the cam to see the oil ports.

The valve I posted about has nothing to do with it, it is simply a check valve designed to open at a certain bar pressure.

This valve will open if you added too much oil and the pressure went over spec.

Probably not a common replacement but the valve could be gunked up to the point it gets stuck open when it should not be or even the opposite, baked oil blocking the entry not allowing it to open up.

When the weather breaks I will look into this further.

The oil holes in the head under each cam lobes provides oil for the "Hydraulic lifters" The hydraulic lifter blocks oil from reaching the top of the head. Oil is still needed where the cam hit the hydraulic lifter to prevent metal on metal contact. That is why the "Dry Side" of your engine is making noise. You don't have oil on the top of the hydraulic lifters so you have metal to metal contact.

Bentley also provides manuals for BMW and Porsche cars. As a former BMW owner I am/was on BMW forums. The ohm reading for the CPS for E34 BMW are wrong, and the Ohm readings for testing the coil packs are also incorrect.

I haven't need to do a lot of trouble shooting on my Avant so I haven't need to use Bentley that often. I'm sure if you do a search you will find errors in the Bentley Manual for our cars.

Here's a quick review on the Bentley Manual by Audi owners.

http://www.audiforums.com/forum/audi...manual-124193/

If you can't tell the left side from the right side I think that is an error. LOL

[Prospeeder]

i think you have this mixed up. There not relief valves, they are oil retention valves. They keep oil in the top end of the engine for lubricated start ups. If Bentley is calling them relief valves, they are wrong, which is isn't uncommon for those manuals to have errors all over.

[A6Gary]

Per ETKA, they are called "pressure limiting valves", P/N 078–103–363–P, one in each head (AFC engine). There are also the (2) "check valves" underneath the intake manifold in the valley.