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2008 Multivan 2.5 tdi oil leak in air inlet before turbo

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  • 2008 Multivan 2.5 tdi oil leak in air inlet before turbo

    Gday all,
    Lately I have been investigating oil pooling and leaking through black plastic elbow join from air inlet to turbo of the Multivan (128kw tdi)

    My mechanic has cleaned it up and is inquiring re new seals for this elbow to stop the oil leak onto the under tray to at least slow down the leak for now and monitor. We discussed whether the turbo is leaking oil into the elbow as the route cause.The engine runs great with no performance issues and I skeptical that the turbo is in need of replacement. Has done 149,000k.

    I am now thinking it is excess oil coming out of the PVC into the air inlet tube ( that then joins to the black plastic elbow and pools oil there). I have pulled the PCV hose off and there is a reasonable amount of oil residue, more than just blowby mist.

    There is also only oil mist in the intercooler pipe side of the turbo which is a great sign of no oil spewing from the turbo outlet.

    If the PCV is knackered letting excess oil to blowby from the rock cover, is there way to test this without accessing the rocker cover? I cannot see that it is straight forward to access this and replace the PCV without major surgery to remove the plastic rocker cover and intake manifold.

    Thoughts would be greatly appreciated.

    Regards,

    Scott
    Last edited by Silver Caravelle; 13-03-2022, 12:56 PM. Reason: typo

  • #2
    PCV for sure. My turbo is at 267kms and still pretty oil free. Unlikely to leak BACK out the intake, it blows any bearing leak blowby into the intercooler. You'd be wise to fit a Provent 200 catch can in between rocker cover and intake inlet, here's a pic of mine, with a drain hose down to the bottom of the engine with a small plastic irrigation tap at the end for periodic draining. The cheap Provents on eBay are China ones with a basic mesh grid, nowhere near as good as the real deal at about $180, but better than nothing. I run the real thing, and have a China first stage with real Provent second stage on my Yeti, seems to work well.

    Ribbed hoses from HKBPerformance on eBay out of SA.

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    2014 Skoda Yeti TDI Outdoor 4x4 | Audi Q3 CFGC repower | Darkside tune and Race Cams | Darkside dump pDPF | Wagner Comp IC | Snow Water Meth | Bilstein B6 H&R springs | Rays Homura 2x7 18 x 8" 255 Potenza Sports | Golf R subframe | Superpro sways and bushings | 034 engine mounts | MK6 GTI brakes |

    Comment


    • #3
      Hi Greg
      Thanks for the pics, how and where is the provent attached to the van?

      Any pics of the bracelets or how it’s attached?

      Cheers

      Greg

      Comment


      • #4
        Hi Greg,

        Thanks for this and noted re Turbo. I have been checking out whether to go the Provent path as alternative fix. The absolute level of tear down it seems to replace a PCV inside the rocker cover, forces one down the Provent path. The only thing though now, is potentially topping up with oil periodically, given oil still escapes from rocket cover to Provent. Otherwise engine has not needed top ups between each service.

        Regards,

        Scott

        Comment


        • #5
          Originally posted by gregned View Post
          Hi Greg
          Thanks for the pics, how and where is the provent attached to the van?

          Any pics of the bracelets or how it’s attached?

          Cheers

          Greg
          Zipties to nearby things using the supplied Provent can holder. I'll make it better down the line.
          2014 Skoda Yeti TDI Outdoor 4x4 | Audi Q3 CFGC repower | Darkside tune and Race Cams | Darkside dump pDPF | Wagner Comp IC | Snow Water Meth | Bilstein B6 H&R springs | Rays Homura 2x7 18 x 8" 255 Potenza Sports | Golf R subframe | Superpro sways and bushings | 034 engine mounts | MK6 GTI brakes |

          Comment


          • #6
            Originally posted by Silver Caravelle View Post
            Hi Greg,

            Thanks for this and noted re Turbo. I have been checking out whether to go the Provent path as alternative fix. The absolute level of tear down it seems to replace a PCV inside the rocker cover, forces one down the Provent path. The only thing though now, is potentially topping up with oil periodically, given oil still escapes from rocket cover to Provent. Otherwise engine has not needed top ups between each service.

            Regards,

            Scott
            Mate I've never had to top up between changes with a Provent, it's still normal loss, the rocker cover system is hindered by the heat and short route it takes, hence why my Provent is over the other side giving the oil as much time and distance to cool as possible.
            2014 Skoda Yeti TDI Outdoor 4x4 | Audi Q3 CFGC repower | Darkside tune and Race Cams | Darkside dump pDPF | Wagner Comp IC | Snow Water Meth | Bilstein B6 H&R springs | Rays Homura 2x7 18 x 8" 255 Potenza Sports | Golf R subframe | Superpro sways and bushings | 034 engine mounts | MK6 GTI brakes |

            Comment


            • #7
              Cheers Greg. If say the PCV is working correctly as designed, does this ordinarily minimize oil loss from the rocker cover with only prodiminately oily mist blow by? Where as when the PCV is faulty, more oil leaves the rocker cover into the Provent whether the hoses are long or short? Unless there is a good way of recirculating the oil?

              Thanks,

              Scott

              Comment


              • #8
                Yes, but the rocker cover PCV is a static "maze", it can't really "wear out" or stop functioning. In your case to stop the pooling it's catch can time. Rocker cover PCV systems work as intended, you add a catch can to stop the overflow the rocker cover still lets through, there is oil blowby "mist" from brand new, it just takes time to coat the intake and start pooling. Your EGR valve area where the engine also adds soot is where the real fun begins. Oil blowby plus soot equals 3D gunk buildup all the way to the cylinders. Problem of modern direct injection cars that don't have a carbie and wash the intake out.
                Last edited by Greg Roles; 13-03-2022, 06:15 PM.
                2014 Skoda Yeti TDI Outdoor 4x4 | Audi Q3 CFGC repower | Darkside tune and Race Cams | Darkside dump pDPF | Wagner Comp IC | Snow Water Meth | Bilstein B6 H&R springs | Rays Homura 2x7 18 x 8" 255 Potenza Sports | Golf R subframe | Superpro sways and bushings | 034 engine mounts | MK6 GTI brakes |

                Comment


                • #9
                  Many thanks for the info Greg.
                  Cheers,
                  Scott

                  Comment


                  • #10
                    Hi all,

                    Please see the link below re PCV(s) for the R5 2.5 engine. Attribution to Gnits; Club Tourareg Forum.

                    It turns out the PCV(s) set up is a little more convoluted and is integrated into the rocker cover with two separate items. On the 2008 T5, it is even more complicated to remove the rocker cover to inspect for perforation of the PVC(s) membranes. If some of these individual membrane parts are not entirely available, then it looks like a complete new plastic rocker cover. What a nightmare.

                    If these PCVs are working correctly, the oil flow to air inlet duct from blow by should be minimal with predominantly oil mist. If there is a perforation, then oil flow with blow by is likely going increase.

                    I can see why a Provent is a solution to catch excess oil, but the route cause is still sitting under the rocker cover!

                    DIY: Touareg 2.5 TDI R5 valve cover PCV valve repair / diaphragm replacement | Club Touareg Forum
                    DIY: Touareg 2.5 TDI R5 valve cover PCV valve repair / diaphragm replacement | Club Touareg Forum

                    Cheers,

                    Scott

                    Comment


                    • #11
                      Do as you wish mate, it's your car, I fit Provent's to every diesel I have ever had, from new, and all my intakes are bone dry, and most important my intake valve stems remain clean! This "oily mist" is the whole problem! If the membrane does indeed eventually fail, I'm still covered. Happy days.
                      Last edited by Greg Roles; 15-03-2022, 05:21 AM.
                      2014 Skoda Yeti TDI Outdoor 4x4 | Audi Q3 CFGC repower | Darkside tune and Race Cams | Darkside dump pDPF | Wagner Comp IC | Snow Water Meth | Bilstein B6 H&R springs | Rays Homura 2x7 18 x 8" 255 Potenza Sports | Golf R subframe | Superpro sways and bushings | 034 engine mounts | MK6 GTI brakes |

                      Comment


                      • #12
                        Hi Greg,
                        Sorry I didn't get back to you. Been off line for a bit. As you recommended, I am going to installa Provent 200 or a maybe the Ryco one as it is nearby at Super Cheap with a universal install kit that I might be able to utilize some of the parts.

                        I have read your threads from some years back and also Transporter's. I am not clear on what you settled to connect the hoses to the PCV hose ends at valve cover and turbo air inlet? To maintain the 45 degree angle join on the turbo air let, 90 degree join at the valve cover end, could cutting the PCV hose off to keep these joins be an option? I did see it mentioned at some point alternatively using copper junctions. Also based on usage over time what type of silicon or rubber pcv hose worked best?

                        Cheers,

                        Scott

                        Comment


                        • #13
                          Originally posted by Silver Caravelle View Post
                          Hi Greg,
                          Sorry I didn't get back to you. Been off line for a bit. As you recommended, I am going to installa Provent 200 or a maybe the Ryco one as it is nearby at Super Cheap with a universal install kit that I might be able to utilize some of the parts.

                          I have read your threads from some years back and also Transporter's. I am not clear on what you settled to connect the hoses to the PCV hose ends at valve cover and turbo air inlet? To maintain the 45 degree angle join on the turbo air let, 90 degree join at the valve cover end, could cutting the PCV hose off to keep these joins be an option? I did see it mentioned at some point alternatively using copper junctions. Also based on usage over time what type of silicon or rubber pcv hose worked best?

                          Cheers,

                          Scott
                          Hi mate, ideally you reuse the ends (connectors) or remove 1 connector only, so you void awkward angles to your new hose arrangement to provent kit. Ryco kit is good and for the cartridge maintenance.... I just wash in brake cleaner, dry and reuse. I've done that in my T5 for 140kkm despite I bought 2 spare cartridges. I've used silicon hose, it lasted 11 years and it was like new.

                          Sent from my SM-N986B using Tapatalk
                          Performance Tunes from $850
                          Wrecking RS OCTAVIA 2 Link

                          Comment


                          • #14
                            Hi Transporter, thank you very much for clarifying. I will reuse those connectors. Might take a little bit to separate the pcv hose from them in hot water, but yes will sort out the awkward angles for the new hoses. Great tip for the filter too!
                            Cheers, Scott

                            Comment


                            • #15
                              Originally posted by Silver Caravelle View Post
                              Hi Transporter, thank you very much for clarifying. I will reuse those connectors. Might take a little bit to separate the pcv hose from them in hot water, but yes will sort out the awkward angles for the new hoses. Great tip for the filter too!
                              Cheers, Scott
                              Use the heat gun or hairdryer. Works very well.
                              Performance Tunes from $850
                              Wrecking RS OCTAVIA 2 Link

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