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  1. #241
    Veteran Member Three Rings
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    Quote Originally Posted by low-profile View Post
    I’m actually happy to hear that. I swapped my turbos last spring, which included changing out all the o-rings and did not note any screens. However, I wasn’t looking either and was beginning to think I just overlooked them. Thanks for posting as I was considering taking the top half down again just to check. You are the man!
    There is a plate under the turbos, beneath that plate is the screen and below it is a giant check valve. I'm replacing the screen and gasket. I'll be cleaning the check valve and lines in the ultrasonic tank. Attached is the check valve that is below the screen. This keep oil from not draining back after sitting. So on cold starts the turbos instantly see oil.

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    Current daily- '13 S6 - EPL stage 2
    Backups '08 A4 2.0 and '10 A6 3.0t

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  2. #242
    Established Member Two Rings
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    An anti drainback valve, that makes sense. I appreciate your feedback.
    Did you note any clogging or coking? I’m still at odds with the screen clogging theory.


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  3. #243
    Established Member Two Rings
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    Boom goes the turbo...

    I’m going to share a tip for you or anyone else swapping turbos.
    The factory v band clamp holding the chra to the turbine housing is installed with the fastener at the 6 o’clock position. You can reposition the clamp so that the fastener is at the 12 o’clock position. This will make it much easier to change turbos in the future as the exhaust manifold will not need to be removed. Simply undue the v band.
    FYI, do not worry about not having the chra properly clocked. There is a pin in the v band flange which only allows the chra to be clocked in the factory position.


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  4. #244
    Veteran Member Three Rings s4nicetry's Avatar
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    Quote Originally Posted by brian_216 View Post
    There is a plate under the turbos, beneath that plate is the screen and below it is a giant check valve. I'm replacing the screen and gasket. I'll be cleaning the check valve and lines in the ultrasonic tank. Attached is the check valve that is below the screen. This keep oil from not draining back after sitting. So on cold starts the turbos instantly see oil.

    Sent from my SM-N950U using Tapatalk
    Interesting, those appear to be the same check valves used in the older 4.2L's. These were known to fail on those causing loss of oil pressure to the timing chain tensioner system and aiding in its eventual failure. I would hope Audi made some improvements to it over the years, as a faulty valve would explain starvation to the turbos. Does the valve move smoothly for you, not sticking at all?

  5. #245
    Established Member Four Rings OlyS6's Avatar
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    Quote Originally Posted by brian_216 View Post
    There is a plate under the turbos, beneath that plate is the screen and below it is a giant check valve. I'm replacing the screen and gasket. I'll be cleaning the check valve and lines in the ultrasonic tank. Attached is the check valve that is below the screen. This keep oil from not draining back after sitting. So on cold starts the turbos instantly see oil.

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    Brian, would you mind pointing out where the plate is under the turbos? I don't recall ever seeing one, so obviously missed it. A pic of the location would be awesome. I didn't see any mention of it in the shop manual either, which is annoying.
    2016 S6, mythos black, RS7 turbos, MRC inlets |AWE intake and touring exhaust| APR downpipes| AMS cooler| Eurocode sways, end-links, and AK | Audi CCB| HRE P103, 20x10 | RS6 grille| Neidfaktor CF mirrors, diffuser, and steering wheel| Blackvue dashcams| Escort Max CI 360 | RS6 LED headlights |Sound: Navtv Zen-v, Audiocontrol DM-810 DSP, JL HD900/5 driving JL10W3 sub and Focal KX3 up front. Rear; JL HD600/4 driving Focal KX2.

  6. #246
    Established Member Two Rings
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    Quote Originally Posted by OlyS6 View Post
    Brian, would you mind pointing out where the plate is under the turbos? I don't recall ever seeing one, so obviously missed it. A pic of the location would be awesome. I didn't see any mention of it in the shop manual either, which is annoying.
    I believe he is referring to the plate located in the valley of the engine. If you look at the pic he posted with the turbos removed, you can see the plate laying on top of the radiator support.


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  7. #247
    Veteran Member Three Rings
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    Right here. Had this same discussion on FB about the check valve.

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    Current daily- '13 S6 - EPL stage 2
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  8. #248
    Veteran Member Four Rings Dasquade's Avatar
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    Sad to hear your turbo's are broken aswell Brian :(.
    Since most is off....any way to look/check if the engine has a lot of carbon near the valves (milage)?
    Current S6 C7 avant 2013: estoril | ceramics | JD engineering stage 2 | LightVan no backseats | Milltek non-res valved | 034 trans-diff mount |CETE ASCv2 & EVC | FL dynamic tails & dynamic mirror signals | Thermo ZO coated catless DP | Custom HX cooler (JD) | RS6 c6 matt gunmetal 20" wheels | custom tailgate spoiler & diffuser | Maxton front lip | Armor heatshielded mani-turbo-dp | B&O led lens tweeters (replica)
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  9. #249
    Registered Member One Ring
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    well - add me to the list of blown turbos. 2013 S7 with 54k miles, stage 1 for 6 months. No help from AoA due to being out of warranty and tuned.

    Though I think that the dealer is the culprit here, just had the car in last week for the pcv (loud whining). They fixed it and then the next day that I drive it both turbos fail. Flatbed to the dealer (which they paid for, also indicating some potential ownership of the issue) and then 2 days later they deliver the bad news.
    Quoted $10k to replace, haven't decided what I'm going to do yet. I'm between going cheap (rebuild or pick up some used turbos) just to then sell in the near future, or the more costly option to just go stage 3 :-)

  10. #250
    Established Member Two Rings
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    Confirming from some recent replies, yes those check valves are also buried in the 4.2 and little known. Folks go after them sometimes on the 4.2 when they hear moderate lifter noise they just can't get resolved to their satisfaction, usually more than a few seconds after start up. Others though just say basically, "all the 4.2's do that." From having a C5 4.2 from new to 140K miles, mine didn't.

    Even before that though, they are also all the way back in the 2.8 that debuted with the C4 and B5 (?) in the early 90's. Back when the blocks were still cast iron and heads were only 2V. I changed them in my 1996 A6 2.8. Further, way back then there was an old TSB on them, issued for the A4/90 2.8. It was issued in the old paper form: I once had a copy from a subscription Audi used to offer 20 years ago so remember it. It noted some cars motors exhibited a loud knocking noise, which was being caused by oil starvation to the (then new to Audi's) hydraulic lifters. The fix was to replace the antidrainback, aka check valves. Having had it on my C4 A6 maybe 5 years in, it made a gawd awful racket just out of the blue when motor got hot, like a restart after it had been recently driven on a warm or hot day. At first it happened rarely and was very hard to get to recur. Over time it got worse and more frequent to where if you heard it and were familiar with the issue, you could nail it. And frankly having the new oand old check valves side by side for the replace I did myself, there was nothing at all obvious visibly to clue you in it was not working correctly. There fortunately once the lifters got oil all was good again. I can imagine on ultra hot turbines spinning at 10K plus RPM's at times, without 100.0000% reliable oil flow, not so pretty.

  11. #251
    Established Member Two Rings
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    If this check valve is a contributing factor to oil starvation and ultimately failure, were going to see early failure of the replacement turbos too. Is there a test procedure for this part? How do you determine if the oiling system is working properly for the turbos?

  12. #252
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    Quote Originally Posted by ryanlada View Post
    If this check valve is a contributing factor to oil starvation and ultimately failure, were going to see early failure of the replacement turbos too. Is there a test procedure for this part? How do you determine if the oiling system is working properly for the turbos?
    I'm going to say no. My check valve came out clean and functional. It is a ball and spring. It wasnt coked up with oil gunk. There is a screen that sits above it right below where the oil feed lines connect. That I will say was more than 30% blocked with solid. A quick spray of brakeclean made it look essentially like new. I ordered a new one anyway for as little as it cost. I have the valve and all the lines in my friends ultrasonic tank. I'll grab them after work today and install new o rings on them and they will be as good as new. Hopefully today the bank approves everything and I can pull the trigger on all the expensive stuff. Wish me luck. And sorry to all the others with failed turbos. Another guy on FB in Florida posted up about the same thing yesterday, and was waiting on diag. Crazy that they are all going right now.

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  13. #253
    Veteran Member Four Rings Dasquade's Avatar
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    Thanks again Brian for sharing your failure and info on the check valve/screen.
    Maybe this a contributes to the failures...BUT anybody know if this item is part of the check precedure on failed turbo's?
    I didn't think i saw something about it in the TSB of the failed turbo's. Don't take away it is good to check it out/clean or replace once you are there!
    *i'm starting to save for oil seperator and new turbo's :( (my tuner however has never had one failed last time i checked...).
    Current S6 C7 avant 2013: estoril | ceramics | JD engineering stage 2 | LightVan no backseats | Milltek non-res valved | 034 trans-diff mount |CETE ASCv2 & EVC | FL dynamic tails & dynamic mirror signals | Thermo ZO coated catless DP | Custom HX cooler (JD) | RS6 c6 matt gunmetal 20" wheels | custom tailgate spoiler & diffuser | Maxton front lip | Armor heatshielded mani-turbo-dp | B&O led lens tweeters (replica)
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  14. #254
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    Just got may care back today after both turbos were replaced. Apparently the check valve had to be replaced and the screen was clogged with "fine metal particles". Fine metal particles were also found in the oil. So apparently the turbos were starved for oil, thus causing failure. What concerned me was the fact of all this metal in the oil where did the metal come from
    '14 Audi S7 Prestige, Ibis White on black, Black Optics, Drivers Assistance, Cold Weather pack, LED Headlights, Sports Diff. Anthracite HRE FF01's with PS4S's.
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  15. #255
    Veteran Member Three Rings s4nicetry's Avatar
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    Quote Originally Posted by BCT View Post
    Just got may care back today after both turbos were replaced. Apparently the check valve had to be replaced and the screen was clogged with "fine metal particles". Fine metal particles were also found in the oil. So apparently the turbos were starved for oil, thus causing failure. What concerned me was the fact of all this metal in the oil where did the metal come from
    Metal particulates are probably from the turbos bearings. Interesting to hear that the check valve had to be replaced. I don't believe it's been mentioned on the tsb for turbo failures.
    Last edited by s4nicetry; 05-14-2018 at 03:00 PM.

  16. #256
    Established Member Four Rings OlyS6's Avatar
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    Quote Originally Posted by brian_216 View Post
    Right here. Had this same discussion on FB about the check valve.

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    Thanks for the info!


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    2016 S6, mythos black, RS7 turbos, MRC inlets |AWE intake and touring exhaust| APR downpipes| AMS cooler| Eurocode sways, end-links, and AK | Audi CCB| HRE P103, 20x10 | RS6 grille| Neidfaktor CF mirrors, diffuser, and steering wheel| Blackvue dashcams| Escort Max CI 360 | RS6 LED headlights |Sound: Navtv Zen-v, Audiocontrol DM-810 DSP, JL HD900/5 driving JL10W3 sub and Focal KX3 up front. Rear; JL HD600/4 driving Focal KX2.

  17. #257
    Established Member Three Rings
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    Quote Originally Posted by OlyS6 View Post
    Thanks for the info!


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    Oly, just for practice you should pull your turbos off again and take a peek at that screen under check valve! You can start timing yourself, and then do it blindfolded later on...
    2016 Daytona Gray S7. Black optics + sport pkg. APR stage 2 + TCU, eurocode stuff, cosmetic stuff.

  18. #258
    Established Member Four Rings OlyS6's Avatar
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    Quote Originally Posted by kpriv View Post
    Oly, just for practice you should pull your turbos off again and take a peek at that screen under check valve! You can start timing yourself, and then do it blindfolded later on...
    I am sort of curious about my lines, since I didnt replace them. Potentially, when my new grille comes in, I could go for it and replace the lines and check/clean the screen. Not sure if the ‘juice is worth the squeeze’ on that one though. I have gotten pretty proficient at taking off and putting the front bumper back on- probably close to 10 times now.


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    2016 S6, mythos black, RS7 turbos, MRC inlets |AWE intake and touring exhaust| APR downpipes| AMS cooler| Eurocode sways, end-links, and AK | Audi CCB| HRE P103, 20x10 | RS6 grille| Neidfaktor CF mirrors, diffuser, and steering wheel| Blackvue dashcams| Escort Max CI 360 | RS6 LED headlights |Sound: Navtv Zen-v, Audiocontrol DM-810 DSP, JL HD900/5 driving JL10W3 sub and Focal KX3 up front. Rear; JL HD600/4 driving Focal KX2.

  19. #259
    Veteran Member Four Rings Dasquade's Avatar
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    Quote Originally Posted by BCT View Post
    Just got may care back today after both turbos were replaced. Apparently the check valve had to be replaced and the screen was clogged with "fine metal particles". Fine metal particles were also found in the oil. So apparently the turbos were starved for oil, thus causing failure. What concerned me was the fact of all this metal in the oil where did the metal come from
    Indeed thanks for sharing! This wasn't mentioned before afaik and might be 'the killer' or at least definatly something to look into (replace/clean) if the turbo's fail. Sucks it is all the way down there :(. Everything needs to come off. Bit a dilemma here if i should 'do it' now mines are still decent (i hope), replace oil seperator and do the oil out and coolant out while i'm at there.
    Current S6 C7 avant 2013: estoril | ceramics | JD engineering stage 2 | LightVan no backseats | Milltek non-res valved | 034 trans-diff mount |CETE ASCv2 & EVC | FL dynamic tails & dynamic mirror signals | Thermo ZO coated catless DP | Custom HX cooler (JD) | RS6 c6 matt gunmetal 20" wheels | custom tailgate spoiler & diffuser | Maxton front lip | Armor heatshielded mani-turbo-dp | B&O led lens tweeters (replica)
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  20. #260
    Veteran Member Three Rings 1975audi's Avatar
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    Back in March when I took out my car from storage I started it up and had a very rough idle, the engine light came on and the epc light.
    I scanned it and I got a multiple miss fire and miss fire on cylinder 5
    The next day it started up fine, I thought it was old gas that caused it.
    A month later same thing but I drove it for a block and back home on limp mode, scanned it and same thing miss fire on cylinder 5.
    Later that same day I started it and it was fine until 2 weeks later when I got off the hwy and the car died and wouldn't start.
    Flatbed to the dealership and they told me turbos blown
    Do you think it's all related or is that a separate issue
    2014 S6

  21. #261
    Established Member Two Rings
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    Quote Originally Posted by brian_216 View Post
    I'm going to say no. My check valve came out clean and functional. It is a ball and spring. It wasnt coked up with oil gunk. There is a screen that sits above it right below where the oil feed lines connect. That I will say was more than 30% blocked with solid. A quick spray of brakeclean made it look essentially like new. I ordered a new one anyway for as little as it cost. I have the valve and all the lines in my friends ultrasonic tank. I'll grab them after work today and install new o rings on them and they will be as good as new. Hopefully today the bank approves everything and I can pull the trigger on all the expensive stuff. Wish me luck. And sorry to all the others with failed turbos. Another guy on FB in Florida posted up about the same thing yesterday, and was waiting on diag. Crazy that they are all going right now.

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    There you go, screen partially blocked. Maybe that contributed, not sure. I remember that when i went to the dealer to look at buying the stage 3 parts they recommended replacing the oil separator while it was apart. Updated revision or something.
    For those of you that had a failure, finding the root cause is key. I have used high mileage turbos (150k+) on older cars at twice their rated pressure for 50k to 80k miles without a failure. It all about proper oiling and cooling. I'm concerned that simply replacing the failed units will lead to a repeat failure in thousands of miles if the root cause isn't identified and corrected.

  22. #262
    Established Member Two Rings
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    Anyone have the part numbers for the check valve and screen? It would also be nice to know if there was ever any revision history from Audi on the parts or if they are on the same revision since 2013...
    Current Line-Up:
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  23. #263
    Established Member Two Rings Cris_OO7's Avatar
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    For those who have had the dealer replace the turbos, is checking/replacing the screen or oil check valve part of the repair ?


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  24. #264
    Active Member Two Rings
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    Quote Originally Posted by Cris_OO7 View Post
    For those who have had the dealer replace the turbos, is checking/replacing the screen or oil check valve part of the repair ?


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    Yes, the screen was on the work order. I am travelling today but will check on the valve once I get home.

  25. #265
    Established Member Two Rings Cris_OO7's Avatar
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    Quote Originally Posted by Derek978 View Post
    Yes, the screen was on the work order. I am travelling today but will check on the valve once I get home.
    Thank you for answering and checking.


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  26. #266
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    My main concern is how is this contaminated oil bypassing the oil filter?(assuming the screen in on the supply side)


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  27. #267
    Veteran Member Three Rings
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    Quote Originally Posted by low-profile View Post
    My main concern is how is this contaminated oil bypassing the oil filter?(assuming the screen in on the supply side)


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    I think the screen is a finer filter than the paper cartridge filter.

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  28. #268
    Veteran Member Four Rings wwhan's Avatar
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    Quote Originally Posted by brian_216 View Post
    I think the screen is a finer filter than the paper cartridge filter.

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    Also the oil filter does have a bypass, if the pressure differential across it is too high.

  29. #269
    Established Member Four Rings OlyS6's Avatar
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    Quote Originally Posted by brian_216 View Post
    I think the screen is a finer filter than the paper cartridge filter.

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    Brian, any comment or observation on how the BG cleaner worked for you with your oil changes? Have your cylinders looked clean since then? I'm a bit bummed to hear that you still had stuff on your screen by the check valve despite using the BG stuff.
    2016 S6, mythos black, RS7 turbos, MRC inlets |AWE intake and touring exhaust| APR downpipes| AMS cooler| Eurocode sways, end-links, and AK | Audi CCB| HRE P103, 20x10 | RS6 grille| Neidfaktor CF mirrors, diffuser, and steering wheel| Blackvue dashcams| Escort Max CI 360 | RS6 LED headlights |Sound: Navtv Zen-v, Audiocontrol DM-810 DSP, JL HD900/5 driving JL10W3 sub and Focal KX3 up front. Rear; JL HD600/4 driving Focal KX2.

  30. #270
    Established Member Two Rings
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    With such a thin oil, I would like to believe that bypass only opens when the filter is overdue for changing, hence creating higher pressure.



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  31. #271
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    Quote Originally Posted by OlyS6 View Post
    Brian, any comment or observation on how the BG cleaner worked for you with your oil changes? Have your cylinders looked clean since then? I'm a bit bummed to hear that you still had stuff on your screen by the check valve despite using the BG stuff.
    Well with the turbos off all my exhaust valves are white / gray colored. Except cyl number 3. That is still black. So something is up for sure. But the car was running fine. It will be soaking with kerosene soaking in that cylinder (on top of the piston) until it's time for reassembly. That may be a few weeks yet. Hopefully if it is a stick ring this will be my last resort to get things free again.

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    Past fleet

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    '05 S4
    '06 Jetta 2.5
    '01 TT 225

  32. #272
    Established Member Four Rings OlyS6's Avatar
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    Quote Originally Posted by brian_216 View Post
    Well with the turbos off all my exhaust valves are white / gray colored. Except cyl number 3. That is still black. So something is up for sure. But the car was running fine. It will be soaking with kerosene soaking in that cylinder (on top of the piston) until it's time for reassembly. That may be a few weeks yet. Hopefully if it is a stick ring this will be my last resort to get things free again.

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    Good to hear! Sorry about your cylinder 3- I imagine you've already replaced the piston ring? I have a hard time envisioning why 1 individual piston/piston ring would be a repeat offender, unless there is some physical imperfection that might serve as a starting point for sludge to form up on.
    2016 S6, mythos black, RS7 turbos, MRC inlets |AWE intake and touring exhaust| APR downpipes| AMS cooler| Eurocode sways, end-links, and AK | Audi CCB| HRE P103, 20x10 | RS6 grille| Neidfaktor CF mirrors, diffuser, and steering wheel| Blackvue dashcams| Escort Max CI 360 | RS6 LED headlights |Sound: Navtv Zen-v, Audiocontrol DM-810 DSP, JL HD900/5 driving JL10W3 sub and Focal KX3 up front. Rear; JL HD600/4 driving Focal KX2.

  33. #273
    Veteran Member Three Rings
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    Quote Originally Posted by OlyS6 View Post
    Good to hear! Sorry about your cylinder 3- I imagine you've already replaced the piston ring? I have a hard time envisioning why 1 individual piston/piston ring would be a repeat offender, unless there is some physical imperfection that might serve as a starting point for sludge to form up on.
    I did not go in that far. I changed the injector, coil and plug. But that was all so far. Now I'm headed towards stage 3 so I'm crossing my fingers it works out.

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    Current daily- '13 S6 - EPL stage 2
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    '05 S4
    '06 Jetta 2.5
    '01 TT 225

  34. #274
    Veteran Member Three Rings
    Join Date
    Nov 06 2012
    AZ Member #
    103608
    Location
    Pennsylvania

    Quote Originally Posted by OlyS6 View Post
    Good to hear! Sorry about your cylinder 3- I imagine you've already replaced the piston ring? I have a hard time envisioning why 1 individual piston/piston ring would be a repeat offender, unless there is some physical imperfection that might serve as a starting point for sludge to form up on.
    Another thing to investigate is carbon build up. An example from BMW

    Sent from my SM-N950U using Tapatalk
    Current daily- '13 S6 - EPL stage 2
    Backups '08 A4 2.0 and '10 A6 3.0t

    Past fleet

    '07 RS4 misano red on black
    '05 S4
    '06 Jetta 2.5
    '01 TT 225

  35. #275
    Active Member Two Rings
    Join Date
    Mar 26 2018
    AZ Member #
    416142
    Location
    North East Ohio

    Quote Originally Posted by Cris_OO7 View Post
    Thank you for answering and checking.


    Sent from my iPhone using Audizine
    The check valve was also changed

  36. #276
    Veteran Member Three Rings
    Join Date
    Nov 06 2012
    AZ Member #
    103608
    Location
    Pennsylvania

    This is the best news I have ever seen. I had all intentions of sending my turbos to SRM as cores for a credit towards the intakes. Now that I see this I'll be paying for the intakes, and keeping my manifolds at least for this option. This is awesome. Way to go SRM

    Sent from my SM-N950U using Tapatalk
    Current daily- '13 S6 - EPL stage 2
    Backups '08 A4 2.0 and '10 A6 3.0t

    Past fleet

    '07 RS4 misano red on black
    '05 S4
    '06 Jetta 2.5
    '01 TT 225

  37. #277
    Established Member Two Rings RedheadNV's Avatar
    Join Date
    Apr 05 2017
    AZ Member #
    397133
    Location
    Reno, Nv

    Quote Originally Posted by brian_216 View Post
    This is the best news I have ever seen. I had all intentions of sending my turbos to SRM as cores for a credit towards the intakes. Now that I see this I'll be paying for the intakes, and keeping my manifolds at least for this option. This is awesome. Way to go SRM

    Sent from my SM-N950U using Tapatalk
    This is GREAT news! I’ve been talking with a couple turbo rebuilders, and they had told me that a “tuning company” was working on a complete CHRA to drop in my housings. I’m now wondering if this is what they were talking about.


    2013 S6 Quartz gray metallic

  38. #278
    Established Member Two Rings digdah's Avatar
    Join Date
    Dec 11 2017
    AZ Member #
    411044
    Location
    Dallas, TX

    SRM has suddenly become a favorite vendor of mine.
    2013 S6 | Phantom Black Pearl | Innovation Package | BOSE + JL Audio Micro Sub| Milltek non-resonated catback |APR Stage 1 |Avant Garde M510

  39. #279
    Veteran Member Four Rings Dasquade's Avatar
    Join Date
    Sep 07 2010
    AZ Member #
    63764
    Location
    Belgium

    INTERESTING (sorry for caps ;) )!
    Current S6 C7 avant 2013: estoril | ceramics | JD engineering stage 2 | LightVan no backseats | Milltek non-res valved | 034 trans-diff mount |CETE ASCv2 & EVC | FL dynamic tails & dynamic mirror signals | Thermo ZO coated catless DP | Custom HX cooler (JD) | RS6 c6 matt gunmetal 20" wheels | custom tailgate spoiler & diffuser | Maxton front lip | Armor heatshielded mani-turbo-dp | B&O led lens tweeters (replica)
    In development: R8GT steeringwheel | FIS controler (mmi gauges)

  40. #280
    Veteran Member Three Rings 1975audi's Avatar
    Join Date
    Nov 15 2012
    AZ Member #
    104110
    Location
    Hamilton Ontario

    Quote Originally Posted by brian_216 View Post
    There is a plate under the turbos, beneath that plate is the screen and below it is a giant check valve. I'm replacing the screen and gasket. I'll be cleaning the check valve and lines in the ultrasonic tank. Attached is the check valve that is below the screen. This keep oil from not draining back after sitting. So on cold starts the turbos instantly see oil.

    Sent from my SM-N950U using Tapatalk
    Is this the non return valve from the inner valley?
    Audi recommends changing it along with the oil strainer when replacing the turbos
    2014 S6

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