DI Diesel Engines M57/M67 - Common Rail Sec. 3 P.7
Course contents/Background material
Tensioning pulley or idler pulley
The tensioning pulley is designed as a spring-loaded element,
thus rendering the hydraulic connection (M47) unnecessary.
The idler pulley arranged on the alternator ensures the belt drive
runs more smoothly.
© BMW AG, Service Training
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