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  1. #1
    Veteran Member Four Rings 1975audi's Avatar
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    2013 ALLROAD B5 S4
    Location
    Ancaster Ontario

    Low oil pressure (need diy for main and rod bearing replacement)

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    The dreaded red oil can.
    I've changed the pump the switch and the harness .
    Added a oil pressure gauge now and it reads 4.5psi at idle and 20psi at 2000rpm.

    Would anyone have a DIY for this?
    I don't want to pull the engine, I've read it's possible.
    Any help would be great

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    2007 RS4
    2000 B5 S4 stage 3

  2. #2
    Veteran Member Four Rings CELison's Avatar
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    Feb 23 2010
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    Emmaus Pa

    These cars don’t just go through main and rod bearings. Replacing them and slapping it back together won’t fix whatever caused it. Plus I don’t think you can get the upper pan off with the motor bolted in. Pull it and do an autopsy or it will just happen again.

  3. #3
    Veteran Member Three Rings
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    You could have an oil pump failure or bad orings, but as stated, you really should pull the engine and see what the root cause is.

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  4. #4
    Veteran Member Four Rings 1975audi's Avatar
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    2013 ALLROAD B5 S4
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    Ancaster Ontario

    I just replaced the oil pump and 4 new oil rings.
    Isn't possible to get to the upper oil pan if you drop the subframe?

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    2007 RS4
    2000 B5 S4 stage 3

  5. #5
    Veteran Member Four Rings 1975audi's Avatar
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    Nov 15 2012
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    My Garage
    2013 ALLROAD B5 S4
    Location
    Ancaster Ontario

    Forgot to mention car has 380,000klm.
    Went stage 3 with k04 's 2 years ago

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    2007 RS4
    2000 B5 S4 stage 3

  6. #6
    Veteran Member Four Rings CELison's Avatar
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    You would have to support the motor from the top if you do that. That’s not too many miles, something went wrong and you’ll never know what it if you slap some new bearings in. It could fail pretty much instantly depending on what the underlying problem is. Why do you think it needs bearings? Is it knocking? Find a bunch of metal in the pan or filter?

  7. #7
    Veteran Member Four Rings 1975audi's Avatar
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    2013 ALLROAD B5 S4
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    Ancaster Ontario

    Not sure what else it could be. I've read that the bearing are the cause of low oil pressure.


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    2007 RS4
    2000 B5 S4 stage 3

  8. #8
    Veteran Member Four Rings 1975audi's Avatar
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    2013 ALLROAD B5 S4
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    Ancaster Ontario

    Engine is not knocking, drives and sounds like normal.
    Mechanic also suggested to replace both bearings and check if the cam is damaged

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    2007 RS4
    2000 B5 S4 stage 3

  9. #9
    Veteran Member Four Rings 1975audi's Avatar
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    2013 ALLROAD B5 S4
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    Ancaster Ontario

    Op had same symptoms. Low oil pressure.
    Replaced oil pump, switch and harness.


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    2007 RS4
    2000 B5 S4 stage 3

  10. #10
    Veteran Member Three Rings xRenesis's Avatar
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    If it isn't knocking, I'd double check your oil pump and sump install. 5psi is a relatively good size hole or missing part to be that low.

  11. #11
    Veteran Member Three Rings
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    Pull an oil sample

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  12. #12
    Veteran Member Four Rings A1 A2 German's Avatar
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    Feb 28 2005
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    My Garage
    Audi A4 B5, Audi Fox, Audi AMLS TT, GS450, CB175, CL175
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    Tempe

    Our cars have a factory defect, remove the oil filter, ~25mm jam nut, oil cooler and you're left with a ~6" pipe protruding out of the oil housing.
    When you reslide the coolant housing on the pipe, you'll notice a gap between the OUTSIDE of the pipe and the oil cooler hole...this is were you lose oil pressure.
    Reslide off the oil cooler, and get an o-ring kit, and play around with the proper size to block the gap with the o-ring going on first, then oil cooler, jam nut and filter. In addition, I took oil pan gasket maker, and coated the smooth, non-threading portion of the pipe to create a second barrier. First wall of defense is the o-ring, to block the hole, gasket maker is to plug up the chitty tolerances between the pipe and oil cooler hole.

    Fired up, increased oil pressure, no more warning or lights.

  13. #13
    Veteran Member Four Rings 1975audi's Avatar
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    2013 ALLROAD B5 S4
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    Ancaster Ontario

    Removing the upper oil pan this weekend to check rod bearings.
    I did notice a 0 ring cut in half from one of the oil pipes from the oil pump yesterday when I removed it.


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    2007 RS4
    2000 B5 S4 stage 3

  14. #14
    Veteran Member Four Rings 1975audi's Avatar
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    2013 ALLROAD B5 S4
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    Slight knocking is present as well.


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    2007 RS4
    2000 B5 S4 stage 3

  15. #15
    Veteran Member Three Rings
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    Seems like you found the issue. The oring had to have been rolled during instalation.

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  16. #16
    Veteran Member Four Rings 1975audi's Avatar
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    2013 ALLROAD B5 S4
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    Ancaster Ontario

    You think that broken 0ring could cause low oil pressure?
    4.5psi at idle

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    2007 RS4
    2000 B5 S4 stage 3

  17. #17
    Veteran Member Four Rings CELison's Avatar
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    Yes

  18. #18
    Veteran Member Three Rings
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    Definitely. Did you install it dry? If so, you should pull the other orings and see if they are messed up also.

    Always lube oring with the lubricant the are sealing in. This is a good practice for all internal orings. They should slide in and never really be hard to push in.

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  19. #19
    Veteran Member Four Rings 1975audi's Avatar
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    2013 ALLROAD B5 S4
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    Ancaster Ontario

    Update

    Oil pressure has doubled now with the 0ring in probably.

    Idles at 12psi at idle with car fully warmed up.

    30psi at normal driving at 2000rpm

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    2007 RS4
    2000 B5 S4 stage 3

  20. #20
    Veteran Member Three Rings xRenesis's Avatar
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    I would still be suspicious with that 12psi in this weather, depending on filter/oil. Summer time that's going to be low psi warning. Heck, I'm sitting at 20psi after a hour drive in the same weather you're in.
    2005.5 A4 B7 - 2.7t K04 - DTM/S4 OEM+ (My B7 Rear BBK)
    2014 Q5 B8.5 - 3.0t (My B8/B8.5 Rear BBK)
    ig 1red_b7

  21. #21
    Veteran Member Four Rings CELison's Avatar
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    Low warning doesn't exist below 2k.
    B5 S4- K24s, built bottom end, E85 - Gone
    B9 S4- EPL/AWE
    996TT X50 - Marski 700hp

  22. #22
    Veteran Member Three Rings xRenesis's Avatar
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    Correct, but 12psi at hot idle and 30psi at 2000, same weather I'm at 20psi and 38psi respectively. Now I'm 5w40 and KN filter (mobil1 filter I was like 3psi lower on average), anyways, just a food for thought he is 8psi lower at two different points in what should be the same temp as me.

    Just saying I would be cautious once it starts getting hot out again. And depending how long it was ran on that 5psi idle or another cut oring, etc.
    2005.5 A4 B7 - 2.7t K04 - DTM/S4 OEM+ (My B7 Rear BBK)
    2014 Q5 B8.5 - 3.0t (My B8/B8.5 Rear BBK)
    ig 1red_b7

  23. #23
    Veteran Member Four Rings CELison's Avatar
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    Yeah, it still seems pretty low. He did say he could hear a little knock. It's for sure possible that low oil pressure already did some damage.
    B5 S4- K24s, built bottom end, E85 - Gone
    B9 S4- EPL/AWE
    996TT X50 - Marski 700hp

  24. #24
    Veteran Member Four Rings
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    May 10 2018
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    Location
    MA

    Low oil pressure (need diy for main and rod bearing replacement)

    Where are you measuring pressure from?

    What oil?

    All of this matters

    Have had 6 B5 S4’s dating back to my first, bought new, in 1999. My current is at 242k on its original engine. One post from 14 years ago on another forum being the first time I’ve seen or heard of bearings being the root cause of anything. They are a symptom of something else.

    Took my car to the office today. 4F when I left at my house in MA. Car was outside all night, as it is most every night since forever. Cold start pressure was at 5.4 bar. Glanced at it again while in line at Dunkin, 11F outside, car had been running for 40 minutes, almost all highway. Minimal boosted today, no WOT this morning. Idle pressure was at 1.9 bar, 840 rpm. Audi filter, DT40 oil, measured from a port in the driver side head as I recall, but it’s been several years so would need to refer back to my build thread lol


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  25. #25
    Veteran Member Four Rings 1975audi's Avatar
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    My Garage
    2013 ALLROAD B5 S4
    Location
    Ancaster Ontario

    Oil pressure has dropped after a couple of days driving.
    Red can warning come on now after some hwy driving and rpms sit around 1800rpm.
    I also tried 10w60 liquidmoly but that only improved it for 2 days.
    Car is parked now until I figure this out.

    Leaning towards new engine.

    Car also has low compression on 2 cylinders.

    4 of them are at 150psi and the other 2 are at 127psi

    Sent from my Pixel 7 using Audizine Forum mobile app
    2007 RS4
    2000 B5 S4 stage 3

  26. #26
    Veteran Member Four Rings 1975audi's Avatar
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    2013 ALLROAD B5 S4
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    Ancaster Ontario

    Could a oil check valve stuck open cause such low oil pressure?

    Sent from my Pixel 7 using Audizine Forum mobile app
    2007 RS4
    2000 B5 S4 stage 3

  27. #27
    Veteran Member Three Rings
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    Anything that's made to hold pressure could definitely cause it. The only issue i see is you already hear knocking. Does the knocking get faster as you rev?

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  28. #28
    Veteran Member Four Rings CELison's Avatar
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    The check valves just keeps the oil in the circuit from returning to the pan after you shut it off.

  29. #29
    Veteran Member Three Rings
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    If they aren't holding pressure, wouldn't the oil flow past them?

    Aren't they used so you don't have rattle on cold start?

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  30. #30
    Veteran Member Three Rings xRenesis's Avatar
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    They don't "hold" pressure, they are there to try and keep oil in the block/passages instead of just falling to the pan when sitting. Likely the damage was done by the time low oil pressure was noted and scored the walls from no oil pressure. It would be how loud is the knocking

    The check valves are like 1 psi

  31. #31
    Veteran Member Three Rings
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    I see. That makes sense.

    How is the oil pressure regulated?

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  32. #32
    Veteran Member Three Rings xRenesis's Avatar
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    Both pressure controls are built into the pump. If you go look up the 2.7t self study guide for diagrams. It is possible something is stuck in the valve, but that means it went thru the pick up screen and thru the pump

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