 | Home > Technical > Turbo groan / moo-ing sound |
 
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| jnglmstr Member Since: 03 Aug 2015 Location: Dorking - Surrey Posts: 14   
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Hi all,
My turbo (300 tdi) is making a groaning, cow like moo-ing sound from appx 0.5 bar all the way up to 1.0 bar of boost pressure. It gets progressively louder. Up to 0.5 bar it is just a pleasant turbo whistle. What could this be? Waste gate seems to be working as it is not over pressuring, I've replaced all turbo hoses and clips, a little bit of play on the cartridge but not shockingly much, flushed the intercooler, contained some oil, but I think that was coming from the breather as there was also oil on the inlet port of the turbo (breather replaced as well) . EGR has been removed years ago. Waste gate actuator pipe seems ok too. Questions: Is the waste gate actually starting to open at .5 bar? If not, that probably rules out the waste gate / flap in the exhaust. Leaves me with 2 options: inlet manifold gasket or turbo knackered after all? Any other suggestions and where should I start? Cheers! R. |
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19th Mar 2021 10:05pm |
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| jfh Member Since: 08 Jan 2014 Location: West Coast Posts: 359  
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Might be a delaminated pipe.
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20th Mar 2021 1:24pm |
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| jnglmstr Member Since: 03 Aug 2015 Location: Dorking - Surrey Posts: 14
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Well, I think I found it. Pulled the turbo off, took a good look at the vanes:
 Click image to enlarge Now I'm no expert but oil coted half-worn vanes don't seem right to me  |
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23rd Mar 2021 5:45pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5724 
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Yep. Thatβs not correct. Nice easy job though. ππ»ππ»
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23rd Mar 2021 8:56pm |
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| mrd1990 Member Since: 16 Aug 2012 Location: Wales Posts: 600  
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Nice excuse for the Uprated Hybrid Billet turbo
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24th Mar 2021 6:50pm |
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