Low oil pressure

[UrS4boy]

Oil Pump, Temperature Sender, Pressure Relief Valve Info.

I can't find a listing for a 034115109 oil pump. I did find images of one and it looks a bit like a 3B oil pump (you didn't say which engine you have).

"The oil pump is driven off a washer on the nose of the crankshaft (Item 2, PN 034105177 below). The oil pump is a gear pump which means the oil pressure is created by two rotating gear wheels as their teeth intermesh, causing pressure as the grear teeth try to compress the mostly incompressible fluid (the engine oil). If the pressure gets too high for some reason in the pump, the pressure pushes against the pressure release piston and spring, releasing pressurized oil back into the oil pan. Note: The ADU in the RS2 originally used the 054115105D oil pump from the AAR 10V five cylinder gasoline engine instead of the more common 054115105E that the AAN and ABY use. However, the 054115105D was dropped on Jan.11, 2002 in favour of the AAN/ABY oil pump (the 054115105E). The 3B (and NM and 7A) use a 034115105B oil pump."

REFERENCE: http://forums.quattroworld.com/s4s6/msgs/93029.phtml

3B 034115105B oil pump:



The "Cap" on the oil pick-up should not be inverted. Sounds like yours is getting sucked into the pick-up tube, blocking oil flow to the pump



Check the strainer under the cap for debris if you haven't already

[Barn]

Help please.
After an expensive steering overhaul, I finally got my car back together.
I filled the cooling system back up and was just running the car up to temperature, as the car got warmer the oil pressure got lower and the the warning chime sounded. The oil pressure was only around 1 bar maybe lower and the top end started to get a little rattle. I know the senders are good they are both new genuine Audi parts. The oil pressure is always at 5 bar from cold, I'm running 10w/60 Mobil 1 with a genuine filter.
Today I removed the sump to check for a blocked pick up tube but no blockage and no sludge, infact inside the engine and sump was very clean indeed. The only thing I noticed was that the rubber intake manifold on the end of the pick up tube was slightly deformed inwards towards the gauze !
I am not sure what to do next, perhaps the oil pressure relief spring has gone weak or maybe the oil pump has worn. I have found a new Audi oil pump but I think its a diesel one, part no. 034 115 109.
Any help would be awesome, there is no big end noise and as soon as the engine cools it runs beautifully.