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The mechanical belt tensioner was the original tensioner design used on M50, M52, M52TU, and M54 engines until it was replaced by a hydraulic design. Some cars are still out there with the mechanical tensioner, also known as a cam-style tensioner, and were never updated. This is a direct replacement tensioner for those cars and includes the pulley.
The mechanical tensioner has a spring inside that maintains pressure on the belt. A loose belt will cause insufficient charging from the alternator, poor cooling performance from the water pump, and stiffer steering from lower power steering pump output. It might also lead to the belt slipping from the pulleys or premature belt wear.
This is an affordable aftermarket version, made by URO. While we always suggest using OEM parts when possible, we recognize the need for a low cost alternative. This aftermarket version does its job and for a fraction of the cost of a Genuine BMW part. If you are looking for a quality aftermarket mechanical tensioner to do the job, this will certainly work for your needs. (We also sell an OEM INA brand as well.)
Want to upgrade your tensioner to a hydraulic type? We also sell a kit to update the mechanical to the latest hydraulic tensioner design. The hydraulic is quieter and seems to last longer than the mechanical. See related items below.
BMW Fitments:
3 Series E36 (92-99) > 325i E36 (92-99) > 325ic E36 (92-99) > 325is E36 (92-99) > 328i E36 (92-99) > 328ic E36 (92-99) > 328is E36 (92-99) > M3 (1995) E36 (92-99) > M3 (96-99) 3 Series E46 (99-05) > 320i E46 (99-05) > 323Ci E46 (99-05) > 323i E46 (99-05) > 325Ci E46 (99-05) > 325i E46 (99-05) > 325xi E46 (99-05) > 328Ci E46 (99-05) > 328i E46 (99-05) > 330Ci E46 (99-05) > 330i E46 (99-05) > 330xi E46 (99-05) > M3 5 Series E34 (89-95) > 525i M50 5 Series E39 (97-03) > 525i E39 (97-03) > 528i E39 (97-03) > 530i 5 Series E60 / E61 (04-10) > 525i M54 (2004-2005) E60 / E61 (04-10) > 525i N52 (2006-2007) E60 / E61 (04-10) > 530i M54 (2004-2005) E60 / E61 (04-10) > 530i N52 (2006-2007) X3 Series E83 X3 (04-10) > X3 2.5i M54 (2003-2005) E83 X3 (04-10) > X3 3.0i M54 (2003-2006) E83 X3 (04-10) > X3 3.0si N52 (2007-2010) X5 Series E53 X5 (00-06) > X5 3.0i M54 Z Series E36/7 / E36/8 Z3 (96-02) > Z3 2.5 E36/7 / E36/8 Z3 (96-02) > Z3 2.8 E36/7 / E36/8 Z3 (96-02) > Z3 3.0 E36/7 / E36/8 Z3 (96-02) > Z3 M - S52 E36/7 / E36/8 Z3 (96-02) > Z3 M - S54 Z Series E85 / E86 Z4 (03-08) > Z4 2.5i M54 E85 / E86 Z4 (03-08) > Z4 3.0i M54 E85 / E86 Z4 (03-08) > Z4 M
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$33.24
Main Belt Mechanical Tensioner, URO - E36, E46, E39, Z3, Z4, M50, M54, S52
Quality mechanical tensioner replacement - complete assembly
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