dave783 Posted August 7 Share Posted August 7 I own a BMW F31 318d equipped with the 2-liter N47 engine. Recently, I removed the engine and replaced all of the timing chains. Following the reinstallation of the engine, a leakage manifested in the exhaust turbo region. I was unable to visually locate the source of the leak, nevertheless, the drivetrain malfunction indicator persistently appeared. While attempting to remove the exhaust manifold heat cover, I inadvertently fractured the banjo bolt responsible for securing the exhaust gas sensor. After removing the exhaust manifold, I have identified that the first leakage may be originating from the gasket/clamp connecting the turbocharger and the catalyst. The user did not provide any text. I neglected to apply a new gasket while reinstalling the engine. Perhaps it would have been prudent to do so? Additionally, is the metal gasket reversible or does it need a set orientation? Thank you. Quote Link to comment Share on other sites More sharing options...
ByteStorm Posted August 7 Share Posted August 7 The tiny tabs on the inner edge should be bent at a 90-degree angle to the gasket face. They fasten the turbo side securely to keep it in position. As far as I recall, the concave side should be positioned against the turbo. Quote Link to comment Share on other sites More sharing options...
dave783 Posted August 7 Author Share Posted August 7 The catalyst face has a concave shape, whereas the turbo face is flat. It is expected that the tabs would be facing into the turbo. Thank you very much. Quote Link to comment Share on other sites More sharing options...
dave783 Posted August 7 Author Share Posted August 7 I have placed an order for a substitute manifold from eBay. There is a metal gasket present at the point where it is fastened to the EGR. I am certain that my previous one did not have a gasket on this 2 bolt connection. Is it possible that this was implemented after 2013? Quote Link to comment Share on other sites More sharing options...
ByteStorm Posted August 7 Share Posted August 7 The most recent EGR coolers installed during the recall also received a gasket at that junction. Quote Link to comment Share on other sites More sharing options...
dave783 Posted August 7 Author Share Posted August 7 That is logical. Additionally, I was contemplating the use of 'gun gum' paste on the gasket located between the turbocharger and catalytic converter. What are your opinions about gun gum? Quote Link to comment Share on other sites More sharing options...
ByteStorm Posted August 7 Share Posted August 7 I advise against it, since you wouldn't want anything contaminating the catalytic converter or diesel particulate filter. Quote Link to comment Share on other sites More sharing options...
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