578M0026410 Mercury MerCruiser Serpentine Belt | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Alternator / Serpentine Belt - Part Number: 57-8M0026410

Genuine Quicksilver/Mercury alternator belt for selected Mercury 1.5L OptiMax outboards. This OEM belt is designed for compatible 75HP through 115HP Mercury OptiMax DFI engines and replaces the earlier 57-892318 belt reference.

⚙️ Key Features

• Genuine Quicksilver/Mercury OEM alternator belt

• Designed for selected Mercury 1.5L OptiMax outboards

• Suits 75HP through 115HP OptiMax applications by serial range

• Direct replacement for 57-892318

• Helps maintain alternator drive and electrical charging performance

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 57-8M0026410 → Supersedes 57-892318

• 57-892318 earlier OEM reference

OEM / Related Numbers:

• 57-8M0026410

• 8M0026410

• 578M0026410

• 57-892318

• 892318

Aftermarket / Verified Equivalents:

• Aftermarket 4-rib replacement belt references available where matched to Mercury 57-8M0026410 / 57-892318

🚤 Compatibility

Commonly used on:

• Mercury 1.5L OptiMax DFI outboard alternator drive systems

• Mercury / Mariner 75HP-115HP OptiMax accessory belt applications

Typically suits:

• Engine models:

• Mercury OptiMax 1.5L 75HP, serial 1B227000 and up

• Mercury OptiMax 1.5L 80 Jet, serial 1B227000 and up

• Mercury OptiMax 1.5L 90HP, serial 1B227000 and up

• Mercury OptiMax 1.5L 115HP, serial 1B227000 and up

• Mercury OptiMax 1.5L 115 Pro XS, serial 1B227000 and up

• Mercury service applications replacing 57-892318 alternator belt

• HP Range: 75HP - 115HP

• Engine Type: Mercury 1.5L OptiMax 2-stroke DFI outboard alternator belt system

• Year Range: Serial 1B227000 and above, depending on model and parts diagram

🔌 Function

The alternator belt drives the alternator from the engine pulley system. A correct belt maintains charging output and supports reliable electrical system operation while the engine is running.

Common signs of failure:

• Battery not charging correctly

• Belt squeal or chirping

• Visible cracking, glazing or fraying

• Belt slipping on the pulley

• Low-voltage warnings

• Belt dust around the alternator pulley

• Alternator not maintaining output under load

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging