The hydraulic tensioner helps maintain the correct amount of pressure on the drive belt, ensuring there's enough traction for auxiliary components to run correctly. Over time the internal piston seals inside these hydraulic tensioners can wear out, reducing the tension and leading to water pump and alternator failures. Manufactured by OEM tensioner supplier to BMW, INA, and repackaged by IPD Germany.

OEM Part Number: 11281717188
Ref Part Number: 13-0481
INA Part: 533000310