New answers tagged timing-belt
First off, as said, the timing chain is still located at the back of the engine. The N47D20 is still being used today. I have not read anything about them changing out the engine, though there was this article from 2012 about BMW doubling down on their use of the chain at the rear of the engine, supposedly to go into production cars this year (2014), but ...
This is a very big job. The chains are at the rear of the engine, and requires engine, head, and sump removal to replace the chains. They engine is also set up with a set of special tools and timing plates. BMW say that any previous weaknesses are now resolved.
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