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Is the oil pressure relief valve in the oil pump?

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Old 06-26-2004, 01:08 PM   #1
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Is the oil pressure relief valve in the oil pump?
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Old 06-26-2004, 01:34 PM   #2
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Default UrS4...

The oil pressure relief valve should not allow excessive oil pressure, whether the filter bypass valve is open or closed, or am I mistaken?
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Old 06-26-2004, 09:22 PM   #3
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Default Re: Is the oil pressure relief valve in the oil pump?

Nope ... it's part of the oil pickup assembly on the AFC engines.
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Old 06-26-2004, 10:32 PM   #4
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I should have known you had some pertinent info on your site. Thanks!
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Old 06-27-2004, 06:20 AM   #5
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Default there's at least one other known pressure-relief valve...

used in the AAH/AFC engines in the cylinder heads that regulates oil pressure in the lifter oil gallies in each cylinder head.

And there's another one under the valley pan tho I can't tell from the diagram if either are addressed via it's circulation layout.

One things clear... these engines have a lot of in-line oil pressure reliefs going on. Way more than any other engine I'm personally aware of. Great when they work... a potential nightmare if/when any one fails. And everything mechanical will fail.

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Old 06-27-2004, 10:17 AM   #6
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Default That's a little scary

I've had the occasional low oil pressure on previous cars, but I've never had too high oil pressure. I suspect our oil pressure idiot light won't come on if the pressure is too high...
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Old 06-27-2004, 04:47 PM   #7
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Default Re: there's at least one other known pressure-relief valve...

Good call! I never think of the two valves in the head. You can't tell from the picture, but the hex part of the valve is connected to the rest by an extremely thin bit of metal - so thin, in fact, that you're just as likely to twist the head off and have a nice smooth hole in your head than remove the valve. Nice. The valve on 30v engines has a Torx head embedded in the valve body instead, much nicer.

So: oil pressure relief valves:
- 16 bar (232 psi) in oil pickup assembly
- 11 bar (160 psi) safety valve, only opens at high RPM and cold engine temp; AFC only
- pressure relief valve, *cough* in the oil pump
- now in the engine; there are the pressure valves Mance mentioned, one on each head. Those control top-end oil pressure.
- there are two oil check valves in the steadying chamber (under the valley pan), but those don't really do much in terms of pressure control; they just keep oil in the lifters when you shut the engine off.

There's also some pressure control done by the head gasket - each one has a finely-tuned obstruction to oil flow that maintains oil pressure in the engine block when the oil pressure relief valves are open.
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Old 06-29-2004, 06:23 PM   #8
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Default The poop on engine lubrication

If anyone is still reading this thread (and cares), I've put a bit more detailed information on the engine lubrication setup at 12v.org:
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Old 07-01-2013, 10:41 AM   #9
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OK so im a little confused...I have an AHA (99 2.8 A6) do i have a relief valve?

here is my problem: when the engine is cold the oil pressure is perfect through the RPM range ( checked with mechanical gauge) but when the engine gets to normal operating temp the oil pressure drops at 1500-2000 rpm then shoots back to normal. It has a new oil pump and full Syn oil in it, and a OEM Mann filter.
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Old 07-01-2013, 02:51 PM   #10
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run some seafoam in your oil for about 200 miles, about 1/3 of a can
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Old 08-22-2014, 03:11 PM   #11
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Quote:
Originally Posted by CRAZY_RUSSIAN View Post
run some seafoam in your oil for about 200 miles, about 1/3 of a can
I have a 2000 TT with the 1.8T engine. Been working resolve a similar issue where the oil pressure drops after it warms up, this appears to be intermittent but it has been tested by a audi repair shop and they are seeing it happen.

Oil pump was changed, $900 bucks. They checked the engine for sludge and found none but they flushed it anyway.

Crank and main bearing are also in perfect condition, according to the mechanic. Because they don't know for sure what the issue is they recommended replacing the oil pressure valve in the oil filter assembly. This is another 600..

Don't know what to do with this car, the car is in great shape, except I have this oil pressure issue.

Should I try SEAFOAM?
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Old 08-23-2014, 01:00 AM   #12
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your not going to hurt anything with seafoam, but i dont think it will resolve your problem...
and on 1.8t, i really cant give you any advice as im not too familiar with their internal components.
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*(suspension and brakes)034 derling control arm bushings + alum-subframe bushings, 034 street density trans mounts+JHM SOLID” Short Throw shifter. B5 rear sport swaybar, B5 upper a-arms, solid VAP shock mounts + B&G springs + Bilstein sport shocks. EBC 3D front rotors + EBC green pads front and rear. 17" ASA's, head lights, aux gauges. blue plasma instrument cluster, A4 3 spoke steering wheel.
*(engine)rebuilt bottom end with ARP hardware. heads, 7mm swirl polished eurospec valves, dual hi-rev springs with titanium keepers, light weight lifters, AAH cams, ARP head studs, air box velocity stack, 4 to 3 wire MAF conversion,VAP's SXTB, silicone hose kit with VAP's recovery sleeve. ported+gasket matched intake and exhaust, ported headers. 18.5lbs flywheel with SPEC stage 2 clutch.
1968 VW Bug (my pride and joy) *2.5 inch front drop and disk brake conversion, *2110cc motor (in progress)new wiring harness,3 inch wider fenders all around, 195/45r15 front and 195/65r15 rear tiers
1979 Suzuki GS750EN with 31k original miles
1981 Suzuki GS750L (will be on a chopping block for a bobber)
1981 Yamaha XV920
1983 Yamaha XV750 (for g.f.)
1985 Dnepr MT10-36 (stolen)
1992 Dnepr MT11-32 (also stolen)
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