Main Belt Mechanical Tensioner, OEM - E36, E46, E39, Z3, Z4, M50, M54, S52

OEM mechanical belt tensioner replacement with pulley. Replaces BMW part #11281427252.

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Price:
$53.99

On the M50, M52, M52TU, and M54 BMW 6 cylinder engines, the mechanical belt tensioner was the original tensioner design used, also known as a cam-style tensioner. On many cars it was later replaced by a hydraulic piston design. Some cars are still out there with the mechanical tensioner and never received the updated design. If you are replacing an original mechanical style, this is a direct replacement for those cars. It's a pretty easy "1-for-1" replacement if you want to stay with that same spring-loaded mechanical design. It also includes the pulley.

The mechanical tensioner works by using a spring that applies and maintains pressure on the belt. Once the spring gets old and tire, it will cause a loose belt. Loose belts are bad because the lead to insufficient alternator charging, poor cooling performance from the water pump, and heavier steering from lower power steering pump output. Eventually that loose belt will lead to the belt slipping from the pulleys or completely shredding itself from aggressive wear.

This belt tensioner is made by INA, and Original Equipment Manufacturer (OEM) for BMW. We carry this brand for those that want OEM quality without paying $80 or more for a Genuine tensioner that will perform the same. If you are looking to save a few dollars, we also carry an aftermarket version as well. 

Interested in upgrading 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 97-98
E39 (97-03) > 528i 99-00
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 (2004-2005)
E83 X3 (04-10) > X3 3.0i M54 (2004-2006)
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 97-98
E36/7 / E36/8 Z3 (96-02) > Z3 2.8 99-00
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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