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The M50, M52, M54, S50, S52, S54, S65, S85 deflection, or idler, pulley is located separate from the tensioner pulley and guides the belt around other accessories. The pulley contains a set of bearings, that when worn, will produce a screeching or rumbling sound. It's important to inspect and replace the pulley regularly. Spin the pulley by hand and listen for grinding or rumbling sounds and if there is resistance. All of these are signs of bad bearings. The pulley wheel is made of plastic and they are known to crack and snap and get flung around the engine compartment. They can damage your radiator, hoses, fan, and other critical items that will lead to a more expansive/expensive repair. Since the deflection pulley is bolted in place, not pressed on, it is easily replaced during a routine belt change. This pulley is manufactured by INA, the original supplier to BMW for this part and other pulleys. Since it is an OEM part, it conforms to the original design that BMW specified for the engines listed above. It comes with a two year warranty.
BMW Fitments:
3 Series E36 (92-99) > 318i M42 E36 (92-99) > 318ic M42 E36 (92-99) > 318is M42 E36 (92-99) > 323ic E36 (92-99) > 323is 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 E36/5 (95-99) > 318ti M42
3 Series 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
3 Series E90 / E91 / E92 / E93 (06-13) > 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) > M5
6 Series E63 / E64 (04-10) > M6
X5 Series E53 X5 (00-06) > X5 3.0i M54
Z Series E36/7 / E36/8 Z3 (96-02) > Z3 2.3 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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$18.99
Deflection/Idler Pulley, OEM - E36, E46, E9X M3, E60 M5, M50, M54, S52, S65, S85
OEM idler pulley to keep your belt running quiet and true
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