# 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

## Details

- **Price:** 106.15 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 106.15 AUD | In stock |

## Images

- 578M0026410 Mercury MerCruiser Serpentine Belt | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/578m0026410-mercury-mercruiser-serpentine-belt-genuine-quicksilver-oem-part)
> Updated: 2026-05-17