With the BMW 328is Belt Tensioner Bolt, you get solid belt pressure that keeps every component running at peak power. Made from high strength steel, this Belt Tensioner Bolt resists stretch and vibration to lock the spring loaded tensioner to the exact location the manufacturer intended. The tensioner bolt prevents slack in the serpentine belt so that alternator output stays steady, batteries stay healthy, and squeals aren't transmitted into the cabin. The BMW inspires confidence in its drivers partly due to little things like that because that auxiliary drive helps the BMW coupe start every morning, rain or shine. Regardless of whether your 328is rolled off the line in the first production year or you have a later 328is that came with upgraded damped tensioners, the same Belt Tensioner Bolt screws in with a perfect fit. The interchangeability makes servicing the whole 328is range easier. Additionally, it shows how one Belt Tensioner Bolt can enable many different updates without any issues. The cost of a new Belt Tensioner Bolt each time you change a belt is tiny while saving the BMW owner from warning lights, overheated bearings, and sudden loss of steering assist. The Belt Tensioner Bolt reduces belt whip that occurs on quick throttle lifts due to its anchoring of tensioners with decoupler pulleys for modern alternators, thus optimizing fuel economy and extending pulley life. BMW 328is usage will require the front end components to be protected with the use of an adequate amount of torque on the Belt Tensioner Bolt. Owners are happy the simple bolt uses corrosion resistant coatings. It has a robust thread profile that conforms to every BMW powertrain revision. The bolt is light and low cost given the long running 328is nameplate.
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