For Mercruiser Serpentine Belt Idler Pulley 807757T 4.3L/5.0L /5.7L 350 v6 v8

Serpentine Belt Idler Pulley for Mercruiser

This serpentine belt idler pulley for Mercruiser engines maintains proper belt tension and smooth operation across 4.3L, 5.0L, and 5.7L V6 and V8 powerplants, with OEM cross-reference 807757T.

Overview

The serpentine belt idler pulley is a direct replacement for Mercruiser marine engines, ensuring the accessory belt runs true and reduces vibration. This serpentine belt idler pulley is designed for 4.3L, 5.0L, and 5.7L V6 and V8 configurations, delivering reliable performance in harsh marine environments. As a key component, this serpentine belt idler pulley helps prevent belt slippage and premature wear.

Built For Performance

• Precision ball bearing for smooth rotation
• Corrosion-resistant steel construction
• OEM-spec dimensions for direct bolt-on fit
• Low-friction design reduces belt wear
• Sealed bearing for marine durability

Fits These Machines

• for Mercruiser 4.3L V6
• for Mercruiser 5.0L V8
• for Mercruiser 5.7L V8
• for Mercruiser 350 V8

On-The-Job Use

• Replacing worn idler pulleys during engine maintenance
• Ensuring proper belt tension in marine engines
• Reducing noise from belt squeal
• Maintaining alternator and power steering operation
• Supporting high-hour commercial or recreational vessels

Specs At A Glance

Good To Know

Q: What is the OEM part number? A: 807757T.

Q: Does this pulley fit both V6 and V8 engines? A: Yes, it fits Mercruiser 4.3L V6 and 5.0L/5.7L V8 configurations.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.