This little guy has a couple of jobs, really. First, it guides the timing belt along its path around the engine. Think of it like a smooth corner on a racetrack, keeping everything flowing nicely. More importantly, it maintains the correct tension on that belt. It usually uses a spring – loaded arm or hydraulic system to do that, constantly adjusting to keep things tight. It’s part of the timing drive system, which is absolutely critical for how your engine runs. The timing belt (or chain) connects the crankshaft to the camshaft. That connection needs to be precise—everything has to be timed perfectly for the valves to open and close when the pistons are in the right position. The tensioner pulley keeps that belt or chain from flapping around or getting too loose, ensuring that timing stays accurate. A failing tensioner can cause a lot of trouble. If the belt gets too loose, it can slip, throwing off that precise timing I mentioned. That’ll cause all sorts of issues, from rough running and misfires to a complete loss of power. If it gets really bad, the belt can jump teeth or even break, which can lead to serious engine damage—think bent valves, damaged pistons, the whole nine yards. You’ll notice if one's going bad; often you'll get a rattling or whining sound, especially at startup. Sometimes it’s subtle, though. It’s a relatively inexpensive part to replace, and doing it before it causes bigger problems is definitely the smart move. You can find a good one at places like Fixparts Online, they usually have a range of options. Replacing it during a timing belt service is a really common practice to avoid future headaches. Shop with confidence: Timing Belt Tensioner Pulley (MPN 21099) comes with a 3 year manufacturer guarantee!

About Febi

Ferdinand Bilstein is well known for reliability and is trusted by repair professionals worldwide.

Why Choose Febi?

• Febi parts are made to the same standards as original equipment, so you get reliable quality without the high price. • We offer a huge range of parts – everything from engine components to brake parts and even small wear items – all in one place. • Febi has been around for over 75 years, so we know what mechanics and drivers need to keep vehicles on the road. • You’ll find parts for many different makes and models, including popular European cars, making it easy to find what you need. Febi delivers excellence, FixParts Online delivers to your door.