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Message: <blockquote data-quote="M30revival" data-source="post: 109497" data-attributes="member: 94">There is a reason for having self-adjusting tensioner to cater for the expansion of tension in the belt. The last time I heard this problem was due to the fact that the batch of tensioners shipped in by the local agent was not up to the quality spec of BMW. Is this still happening?The one you mentioned as I ventured to guess is not really 'fixed'. It is still adjustable but it doesn't have the self-adjusting function. You'll still have to get your mechanic/aircond specialist to adjust the position of the 'rod' to cater for the tension of the belt get loose over time. I remembered this was a local 'invention', probably from the same source I used to got one before. It is cheaper but not by a lot.</blockquote>