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Understanding Chain Tensioner Operation

Model: BMW Serie 5 E39 - Years: 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
Part: Timing belt

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In engines equipped with a timing chain instead of a belt, if you closely follow the maintenance schedule, perhaps reducing the mileage between oil changes and using not only a quality oil but also an additive specifically for timing chains, it may never be necessary to replace the chain itself.

However, it can happen that the chain may stretch slightly and the sliding guides wear a bit, as well as the chain tensioner: this is essentially a pin with a spring-loaded plunger at the tip that keeps one of the sliding guides pressed against the chain, maintaining tension on the chain itself (it is located on the engine, on the passenger side, near the exhaust manifold).


Updated on 16 February 2026 by ScegliAuto


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