Belt Tensioner, OEM INA - E82 135i, E9X 335i, E60 535i N54
Complete OEM mechanical tensioner assembly
This is the mechanical belt tensioner used on most 2007-2010 N54 vehicles - E82 135i/1M, E90 E92 E93 335i/335xi, and E60 535i/535xi. The tensioner keeps the main accessory belt at the proper tension for driving the accessories - alternator, power steering pump, and A/C compressor. A failing tensioner will allow the belt to loosen or slip resulting in diminished performance, especially from the alternator. In extreme cases the belt can slip off the pulleys and potentially lead to a catastrophic engine failure (rare but documented). As a preventative maintenance plan, we recommend replacing the tensioner at every belt change, or 40-60,000 miles. The extent of damage from a failed belt is worth the extra cost every few years.
This tensioner includes the two pulleys and Torx mounting bolt.
This tensioner is manufactured by INA, the original supplier to BMW for this part and other engine components. Since it is an OEM part, it conforms to the original design that BMW specified for the N54 engine. It comes with a two year warranty.
E82 / E88 (08-13) > 135i
E82 / E88 (08-13) > 135is
E82 / E88 (08-13) > 1M (11-12)
E90 / E91 / E92 / E93 (06-13) > 335i
E90 / E91 / E92 / E93 (06-13) > 335is
E90 / E91 / E92 / E93 (06-13) > 335xi
E60 / E61 (04-10) > 535i
E60 / E61 (04-10) > 535xi