Alternator / Water Pump Belt for Mercruiser 4.3L, 5.0L, 5.7L, Repl: 57-48120Q1

Alternator / Water Pump Belt for Mercruiser

This alternator and water pump belt for Mercruiser marine engines replaces OEM part number 57-48120Q1 and fits 4.3L, 5.0L, and 5.7L models to drive both the alternator and water pump efficiently.

Overview

This alternator / water pump belt is a direct replacement for Mercruiser engines with 4.3L, 5.0L, and 5.7L displacements. It transmits power from the crankshaft to the alternator and water pump, ensuring proper charging and cooling. The belt matches OEM specifications for reliable fit and long service life.

Built For Performance

• Replaces OEM part number 57-48120Q1
• Fits Mercruiser 4.3L, 5.0L, and 5.7L engines
• Drives both the alternator and water pump from a single belt
• Constructed to resist heat, oil, and marine environment wear
• Precision-molded for proper tension and alignment

Fits These Machines

• for Mercruiser 4.3L
• for Mercruiser 5.0L
• for Mercruiser 5.7L

On-The-Job Use

• Replace a worn or cracked belt during routine marine engine maintenance
• Restore alternator output and water pump circulation
• Prevent overheating and battery discharge on the water
• Ensure quiet, vibration-free operation

Specs At A Glance

Good To Know

Q: How often should this belt be replaced? A: Inspect the belt for cracks, fraying, or glazing and replace it if any wear is visible or if it fails to maintain proper tension.

Q: Can I use this belt on other Mercruiser engines? A: It is specifically designed for 4.3L, 5.0L, and 5.7L models; always verify your engine's displacement and cross-reference the part number before purchasing.

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