Engine Timing Chain Tensioner.
Adjuster. An oil pressurized Tensioner that keeps the Chain that runs from the crankshaft to camshaft or the Chain that runs from camshaft to camshaft, from becoming loose and jumping a tooth or more causing Engine damage or out of sync crankshaft to camshaft Timing.
Engine Timing Chain Tensioner
550i GT. 550i GT xDrive. 550i, 550xi. 6 Series. 650i. 650i xDrive. 7 Series. 750i xDrive. 750i, 750ix. 750i, 750Li. 760Li. M5. M550i xDrive. M550i xDrive; N63B Engine. M550i xDrive; N63R Engine. M6. M760i xDrive. M760ix. M8. M8 Gran Coupe. M850i xDrive. M850i xDrive Gran Coupe. X5. X6. X7.