 | Home > Puma (Tdci) > 2.2 whistle/siren type noise |
 
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| cretesimon Member Since: 01 Nov 2021 Location: heraklon Posts: 51  
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Hi had the same on one land rover was the exhaust manifold out of shape where it bolts to turbo remove heat shield and check nuts are tight and look for black shoot on shield as that's a sign of a failure
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1st Jun 2023 5:09am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17443  
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Also check the exhaust manifold to cylinder head joint, if the fasteners are loose the gasket can vibrate and make really weird noises.
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1st Jun 2023 6:26am |
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| Yorkshire lad Member Since: 30 May 2023 Location: East Yorkshire Posts: 29 
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I shall have a look when I get home today and report back with my findings. Thank you
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1st Jun 2023 6:45am |
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| Yorkshire lad Member Since: 30 May 2023 Location: East Yorkshire Posts: 29
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Hi, blackwolf/Crete Simon I had a really good look this afternoon after about 30 minutes of trying to get all of those bolts out securing the heat shield.π‘π€¬. Everything looked secure all nuts was tight and no signs of soot anywhere.π€
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1st Jun 2023 4:17pm |
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| MatLandy Member Since: 11 Sep 2020 Location: Paris Posts: 184  
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It is not always obvious to identify a slightly loose bolt or soot traces in the area of the exhaust manifold/turbo.
My experience on my 2.4 is that a very small leakage of exhaust gas with almost no visible soot trace, can create a very loud siren like noise. I had this high pitched noise on my 2.4, that was audible only under certain acceleration circumstances. In effect there was only very little soot visible at one corner of the gasket between the manifold and turbo, but having no better lead or idea, I changed the gasket for the improved Nakatanenga HD gasket. That sealed it for good and got rid of the noise. It has never come back since, and that was 2 yrs / 20 000 kms ago. /Mat The only potential soot trace I could see is circled in red (note: on this picture, I had already started to remove the bolts to swap the gasket):  Click image to enlarge The new Nakatanenga HD gasket in place: Click image to enlarge |
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2nd Jun 2023 8:56am |
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| Yorkshire lad Member Since: 30 May 2023 Location: East Yorkshire Posts: 29
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Thank you mat landy I'll have another look tomorrow and really have a good look and get a new gasket ordered because it's very annoying. And it never did it before the turbo failed.πβΉοΈ
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2nd Jun 2023 8:49pm |
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| Yorkshire lad Member Since: 30 May 2023 Location: East Yorkshire Posts: 29
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 So today I set about removing turbo heat shield to try find where this whistle/siren noise might be coming from but all look well no signs of soot anywhere no loose nuts. So what could I check next you hear it most in 1st and 2nd at about 2000 revs. βΉοΈπ€ |
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7th Jul 2023 8:49pm |
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| Yorkshire lad Member Since: 30 May 2023 Location: East Yorkshire Posts: 29
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Click image to enlarge Click image to enlarge Click image to enlarge |
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7th Jul 2023 8:55pm |
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| Siwynne Member Since: 04 Nov 2016 Location: West lancs Posts: 578 
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Is there any gasket between turbo and manifold. Photos a bit blurry but line seems very thin. Mat lads pics show a thick naka gasket a thin standard one but yours appears to be none existent.
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7th Jul 2023 9:12pm |
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| MatLandy Member Since: 11 Sep 2020 Location: Paris Posts: 184
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As per this post https://www.defender2.net/forum/topic84690.html there indeed seems to be no gasket on the 2.2 between turbo/manifold. The picture I shared are from my 2.4, which had a gasket between turbo/manifold from factory.
/Mat |
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8th Jul 2023 8:08am |
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| Siwynne Member Since: 04 Nov 2016 Location: West lancs Posts: 578
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Mine has a gasket between turbo and exhaust manifold Dec 2012 2.2 registered jan 2013. The head was replaced at about 60k so the dealer might have put a gasket in then. I have recently replaced the turbo core and replaced the gasket. I have heard them make a very aloud siren noise when the egr to exhaust manifold is not tight. Itβs like when you blow a blade of grass between thumbs. The gasket vibrates and makes a hell of a noise
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8th Jul 2023 12:28pm |
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| Yorkshire lad Member Since: 30 May 2023 Location: East Yorkshire Posts: 29
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It's just a strange one it drives perfect pulls really well returns good mpg and has been the same for about 6000 miles it's just annoying as it's not always been there only started doing it just as turbo failed.βΉοΈππ€
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8th Jul 2023 6:34pm |
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