When it comes time to service your timing system, take the guesswork out by choosing one of our pre-made kits. These include everything you will need to do the job properly and completely the first time.
Over time, timing chains can begin to stretch and tensioners can wear out or seize. This leads to slack in the chain, which can cause the chain to slip. A slipping chain is often a death sentence for N55/S55 engines as these are interference engines, resulting in damaged pistons, valves, and other sensitive engine components. If your engine has higher mileage, it is worth it to replace your chain and tensioner for peace of mind. We also recommend picking up timing chain guides as the plastic guides used by BMW are known to wear down and become weak.
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The N55 in your BMW is an interference engine, meaning that if the timing chain were to fail your engine would suffer catastrophic damage due to valvetrain components colliding with each other. Over time the timing chain will start to wear and stretch, potentially causing it to skip timing or just completely fail. Also, the timing tensioners themselves could fail! Early symptoms of timing chain wear include front end noise not associated with VANOS, or slapping noises coming from the timing cover. Turner Motorsport has assembled a complete kit that includes everything necessary, as well as small hardware, to completely service the timing on your N55. Tools needed to do the job can be found on our site as well.
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