Turbo seals or something else

1. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #1 25th June 2012, 18:39

   Right.. I thought my turbo was on its way out but now I'm not as convinced
   
   I thought it was due to it having play.. And the fact I wasn't running a dump valve at a bar of boost.. Obviously rattling the turbine shaft and letting some oil through
   
   However it's getting no worse (although I'm not driving it on boost at all ATM) they only time I seem to see smoke now... Is when I'm cruising along in gear throttle closed for a while the open the throttle again I get a blue cloud up my back window
   
   Sometimes I'll get it sitting at the lights for a bit, and occasionally when driving
   
   I thought it would have worsened by now and the fact it's only happening when I'm coasting in gear with the throttle shut
   
   When I was driving on boost and had just give it some then let off.. There would again be the a cloud but generally more so
   
   Opinions? It could just be very early oil seal failure that I've noticed soon, and that fact I'm not boosting it is helping out, just curious as to why it's only leaking when I'm not driving or at idle ( very rarely smokes on idle and is only tiny amount)
2. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #2 25th June 2012, 18:40

   Only thing I can think is the when I'm driving in gear and off throttle the turbine will be barely moving.. If at all... And this is when it's leaking a small amount into the exhaust???
3. ThrushMotorsport Established Member Joined: Jan 2011 Aberdeen Posts: 1092 Turbo Saxo vtr, 2010 Octavia VRS TSI, mk3 Ibiza cu

   #3 25th June 2012, 18:48

   Blackie, pull off one of your intercooler hoses thats leading to the intercooler, check if it has oil in the piping, if its a small ammount - i wouldnt worry, but if its a good ammount id clean it, then drive it, and then check if it re-appears, im only saying this could be a cause, ive had this with a turbo car before where my boost was going back to standard wastegate pressure.
   
   Edit; actually.. in saying this, you have no oil fume-vent-return going before the turbo, might aswell scrap this
4. jones91 Established Member Joined: Jun 2011 Bridgnorth (Shropshire) Posts: 2001 Jdm Dc2 Integra

   #4 25th June 2012, 18:48

   Might be barking up the wrong tree here, but possibly one of the stem seals?
5. K567 Frequent Poster Joined: Apr 2012 Bradford/Leeds Posts: 775 03 R53 Mini Cooper S with a little extra going on

   #5 25th June 2012, 19:00

   Mate, what thrush said is actually correct check the nearest boost pipe silicone joint, it will show if there is an excess of oil, dubs had this all the time when seals on turbo were going you'd get leak from hot and cold side and it pools at the lowest point so intercooler inlet. Also yeah I agree stem seals at coast you have less pressure allowing inward leak to combust chamber
6. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #6 25th June 2012, 19:08

   I was thinking this that's why I posted up
   
   I'll be fucking foaming if it is tbh
   
   I'm replacing the turbo on Thursday so we"ll get a better idea then
7. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #7 25th June 2012, 19:10

   Also, I've not bothered with the boost pipe as if it's the seals on the exhaust side I'll get 0-minimal oil In there, it's not smoking enough to be ingesting oil.. It's just what's leaking into the exhaust or head
8. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #8 25th June 2012, 19:33

   Thinking its gotta be either turbo or worn valve guides
   
   It's had a full top end rebuild.. But if they're worn it'll still leak down
9. user_43898 Established Member Joined: May 2010 leicester Posts: 1446 Clio 182 Inferno

   #9 25th June 2012, 19:52

   If i had to put money on it id say valve guides/stem seals, in my experience when they are worn they usually allow oil down into the cylinder overnight or after engine idling for long periods then when the trottle is opened you get a short burst of blue smoke slowly clearing away, the fact that the turbo is pretty new would make me steer away from that being at fault. Try whipping the inlet manifold off, if the guides/stem seals are going there will be more oil on the valves/inlet port not just carbon build up
10. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

    #10 25th June 2012, 20:09

    Turbo is very old, head has just been rebuilt
    
    But I think it's probs the valve guides
11. gazza808 Frequent Poster Joined: Jul 2007 Posts: 591

    #11 25th June 2012, 20:17

    Stem seals, valve guides, worn bores/piston rings,
    it's happening under vacuum so they'd be my guesses
12. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

    #12 25th June 2012, 20:56

    Can only be head I just replaced tbh