Serpentine Belt Idler Pulley – Fits Volvo Penta 4.3/5.0/5.7/8.1L Marine Engines (Replaces 3861009) family-yamaha-8ld They prevent the engine from

They prevent the engine from turning side-to-side during trailering

Access Pump: The water pump is located on top of the lower unit

and shift cable bellows from the transom assembly

There are typically two: an upper (vent) and a lower (drain)

Serpentine Belt Idler Pulley – Fits Volvo Penta 4.3/5.0/5.7/8.1L Marine Engines (Replaces 3861009) family-yamaha-8ld They prevent the engine fromSerpentine Belt Idler Pulley Fits Volvo Penta 4. 3 5. 0 5. 7 8. 1L Marine Engines (Replaces 3861009) This serpentine belt idler pulley is designed for a precise fit on a range of Volvo Penta gasoline marine engines from 19992012, including the 4. 3L, 5. 0L, 5. 7L, and 8. 1L models (GXi, Gi, GXiE, and OSi OSXi variants). It serves as a direct replacement for Volvo Penta part number 3861009, ensuring proper belt tension and smooth engine operation.