Shop OEM BMW Part # 11311703747 (11-31-1-703-747). Engine Timing Chain Tensioner. 325i, 525, M3; Piston. W/o M3; Piston. X3; LOWER; Tensioner Piston. X5; LOWER; Tensioner Piston. Z3; Lower

Tensioner. Actuator. Engine Timing Chain. Piston.
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. Crank To Cam. Crank to Cam Chain.

Engine Timing Chain Tensioner

325i, 525, M3; Piston. W/o M3; Piston. X3; LOWER; Tensioner Piston. X5; LOWER; Tensioner Piston. Z3; Lower; Piston. Z3; LOWER; Tensioner Piston. Z4; Lower; Tensioner Piston.