231577 - Washer -
$5.40
$6.75
Tensioner Pulley for the ancillary drive belt on the BMW M51D25 2.5L 6-cylinder diesel engine.
The ancillary drive belt powers auxiliary components including the alternator and power steering pump. The tensioner pulley runs against the belt’s outer surface, maintaining the correct belt tension to prevent slip and vibration. Worn or seized pulley bearings will cause belt noise and eventual loss of auxiliary system function.
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