Marius's Touareg R5 life thread. - Page 45




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  1. #881
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    jip. The damage on the piston top is the result of the ring getting slammed into the piston a few thousand times. Most of it is indentations but there are a few small pieces that stayed stuck and is fused to the piston.
    about 30% of the first compression ring was missing when I took the piston out.

  2. #882
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    Interesting, thank you for disecting the beast

    Theory 1: likely to be an injector disintegrating and the debry causing damage. The injector was then simply replaced, with the debry remaining, which gradually caused failure. When the injector failed, the previous owner decided to flog her. How else would anything get in there

    Theory 2: as per the pdf document posted yesterday, it explains the damage/failure of rings by incorrect oil usage

    Theory 3: still do not think big end bearings can be ruled out (due to incorrect oil). Would it not be difficult to detect any excess tolerance on those without them rotating at speed/being under load?
    2007 Touareg 3.0 V6 TDI (Facelift, Air, Rear Diff Lock, Rear Mounted Spare)
    2008 Audi A4 B8 2.0 TDI (Multitronic)
    2009 KTM 990 Adventure (Daily Commuter & Weekend Fun)
    2012 Imagine Trailvan 4-Sleeper

    * consumption needs to be seen in the context that the vehicle is towing an Imagine Trailvan 50% of the time.


  3. #883
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    In my experience when bearings start to fail things go pear shaped very quickly so if there was enough play to cause the piston damage you will see damage on the bearing shells as well.

    In my opinion a foreign body in the combustion chamber was the initial source of the damage, either part of the ring, injector or some something ingested (but not that likely imho)
    2012 Q7 4.2 TDI
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  4. #884
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    I have to agree on the oil. After a hell lot of phone calls, getting nowhere with the 505.01 or 506.01. So where did I get my info that I need to staff Marius on the oil and the others that told me so. Okay. On ETKA of the dealers I ask for oil and it is listed as 506.01 NOT 505.01. So Sorry for everybody and my book is also wrong. It is VW506.01. This is my 1c input. Do this at your own risk.

    Kevman out
    Last edited by kevman; 2013/03/08 at 11:30 PM.
    2007 Disco 3 TDV 6 S SWAMBO
    2013 Ford T6 3.2 Super-cab
    2008 Fiat Panda 100HP


  5. #885
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    Maruis, did u get your xenon bulbs? Got myne today and guy when out of his way to get them for me. Phoned the spare shop and in an hour he phone me, come pickup your xenon bulbs. I paid R950 for one.
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    2007 Disco 3 TDV 6 S SWAMBO
    2013 Ford T6 3.2 Super-cab
    2008 Fiat Panda 100HP


  6. #886
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    It gets to 100km/h at about 15:45:46

    I will get a better video soon.


  7. #887
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    Ok so 12 seconds plus minus. That's good as new.
    2007 Touareg 3.0 V6 TDI (Facelift, Air, Rear Diff Lock, Rear Mounted Spare)
    2008 Audi A4 B8 2.0 TDI (Multitronic)
    2009 KTM 990 Adventure (Daily Commuter & Weekend Fun)
    2012 Imagine Trailvan 4-Sleeper

    * consumption needs to be seen in the context that the vehicle is towing an Imagine Trailvan 50% of the time.


  8. #888
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    Quote Originally Posted by Kortgat View Post
    Ok so 12 seconds plus minus. That's good as new.
    Jip. On paper 12 seconds sounds slow, but in the treg it feels damn fast. Especially because you don't hear a screaming petrol engine. Just a nice surge of torque from the engine.

    It's plenty fast enough. Plus, I got 8.5l/100km across town the other day.


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  9. #889
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    When I was at the VW driver academy they demonstrated the "launch mode"
    Basically gear into tipronic and hold the stick forward so it will change up when the revs are right, left foot on the brake, accelerate till revs are at 3 000 and release the brake. Very impressive but I am not sure what that will do to the torque converter. I was very happy to do it in their Touareg but not sure if I will try it in mine.

    Could that cause damage?
    VW Touareg 3.0 V6 TDI (Terrain Tech)

  10. #890
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    Quote Originally Posted by Chriseleven View Post
    When I was at the VW driver academy they demonstrated the "launch mode"
    Basically gear into tipronic and hold the stick forward so it will change up when the revs are right, left foot on the brake, accelerate till revs are at 3 000 and release the brake. Very impressive but I am not sure what that will do to the torque converter. I was very happy to do it in their Touareg but not sure if I will try it in mine.

    Could that cause damage?
    The amount of torque that puts on the flexplate, flexplate bolts, torque converter and drivetrain is immense. I wouldn't do it or recommend it.

    Doing this can destroy the ATF in 10 seconds IMHO!

    Remember that the torque converter doesn't work very hard in the touaregs. More often than not the torque converter is locked up - hence the very small difference in fuel economy on the manual VS auto R5 touareg.

  11. #891
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    Quote Originally Posted by Chriseleven View Post
    When I was at the VW driver academy they demonstrated the "launch mode"
    Basically gear into tipronic and hold the stick forward so it will change up when the revs are right, left foot on the brake, accelerate till revs are at 3 000 and release the brake. Very impressive but I am not sure what that will do to the torque converter. I was very happy to do it in their Touareg but not sure if I will try it in mine.

    Could that cause damage?
    Eish... not going to be doing that. Sure it works, but lets leave that for their demo vehicle.
    2007 Touareg 3.0 V6 TDI (Facelift, Air, Rear Diff Lock, Rear Mounted Spare)
    2008 Audi A4 B8 2.0 TDI (Multitronic)
    2009 KTM 990 Adventure (Daily Commuter & Weekend Fun)
    2012 Imagine Trailvan 4-Sleeper

    * consumption needs to be seen in the context that the vehicle is towing an Imagine Trailvan 50% of the time.


  12. #892
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    marius

    n spanner innie vuur.
    daai piston se een kant het seer gekry ok goed.
    die vraag is hoekom of hoe.
    want n ring kannie net uit sy groef uitkom nie.
    so wat het gebeur dat hy so seer gekry het, want vandaar, het die pere uit die boom geval.
    ek wonder, dat as iets van bo af ingekom het, so die skade dalk ander gelyk het.

    net n mening, hier.

    ek wonder ook, dis a duur engine daai.
    en die ding is ook so ver gevorderd.
    hulle weet daar kom gewoonlik fout met die 5de silinder, hoekom hulle nie daar n temp gauge, en oilie drukking gauge opsit nie, weet ek nie.
    of hoekom nie op al die silinders nie, olie druke en temp.
    tegnelogie is daar hoekom gebruik ons dit nie.
    ek kannie dink dat 5 olie druk sensors en 5 temp gauges "sensors" wat ecu toe gaan nie gedoen kan word nie.
    want dis duidelik uit vorige foto's. dat daai cilinders wat net 6 of 7 mm spasie tussen die walls het, nie herstel kan word nie, maar dat n nuwe blok gekoop moet word.

    ek weet jy is nie vw nie.
    maar dit kon sulke probleme voorkom het

  13. #893
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    you won't believe how easy a contaminant can kill a cylinder.

    Rings are strong but brittle. If a small piece of glowplug tip or sand got between the ring and it's seat on the piston the combustion pressure can break it.

    Once it breaks the piston no longer seals as designed and piston slap aggravates and accelerates the failure.

  14. #894
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    marius, therefore , you need to determine what is the real cause of number 5 cyl degrading

  15. #895
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    I have even been theorising that the dampener that sits next to cylinder 5's big end could go early (like the DMF of other vehicles) and give the speed sensor on the engine the wrong reading making the ecu fire the injectors at the wrong time (cylinder 5 being in the harmonic frequency that cause failure perhaps)

    I don't know for sure and I'm sure VW won't disclose even if they knew.

  16. #896
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    marius, unless No 5 runs super hot, hotter than the others, and all being the same, ie, oils , fuel, pump distributor(cant remember what its called, the round one), i would like to see the wiring diagram for this car, not the 12v line, the 5 volt and harness for the injectors.
    the fact that this is a recurring problem, vw not letting on, and if they know, the fact that it happens after heavy mileage, they know the owner isnt really going to ask why. if it were happening at low mileage then all stops to limit damage.

  17. #897
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    Why not attach some temp probes to the head and see what the temps actually do. Normally the head gasket water channels are sized so that more water will pass along the back of the head. So that the hotter cylinders get more water.

    Should be damn interesting.
    LC 78 Troopie 1HD-FTE

  18. #898
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    if anyone has a laser temp readout, all my probes for that work are in the uk, i would spend a day with marius and try to find this problem

  19. #899
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    coolant port pictures.

    I'm sure VW did heat dissipation tests when the developed the motor.







    Perhaps they didn't test with the catalytic converter sitting right there by cylinder number 5. Good thing my CAT is now gutted!
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  20. #900
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    yes, get rid of the cat. i still say that owners of cars DO NOT replace the cats at the recomended mileage and they clog up and create huge amounts of residual heat and kill turbos etc. i and will argue this point to death, that turbos can last 400-500k kms , there is this new belief that turbos last 120k kms and they change them , when the cat actually needs changing.

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