Mercury Marine 896332057 Idler Pulley Assembly

The Mercury Marine 896332057 idler pulley is a critical component of the serpentine belt drive system on Mercruiser CMD and QSD series diesel sterndrive engines. It provides a fixed pivot point to guide and maintain proper belt tension, ensuring reliable operation of the alternator, water pump, and power steering pump. The pulley features a sealed ball bearing designed for continuous high-speed rotation in harsh marine environments. It is engineered to OEM specifications for exact fit and durability on VM Motori-based 2.8L and 4.2L marinized diesel platforms. This part supersedes previous Mercury part numbers 8M0129696, 8M0067447, 8M0067462, and 8M0067446.