57-892318 57-8M0026410 Serpentine Belt for Mercury Optimax 3 Cyl Dfi 75 125HP

Product Overview

This serpentine belt drives essential engine accessories on Mercury Optimax outboard motors. Designed for 3-cylinder DFI models from 75 to 125 horsepower, it ensures reliable power transmission to the alternator, water pump, and other components. This OEM replacement serpentine belt restores factory performance and longevity.

Key Features & Performance

• Direct OEM replacement for exact fit and function
• Constructed from high-strength rubber compound for durability
• Resists cracking, glazing, and wear from heat and oil exposure
• Engineered to handle the load of multiple accessories simultaneously
• Precisely sized to maintain proper tension and reduce slippage

Fitment & Compatibility

• Mercury Optimax 3-cylinder DFI 75HP, 90HP, 115HP, 125HP

Common Uses

• Powering the alternator for battery charging
• Driving the raw water pump for engine cooling
• Operating the power steering pump (if equipped)
• Transferring rotation from the crankshaft to accessory pulleys

Technical Specifications

• Part Number(s): 57-892318, 57-8M0026410

Frequently Asked Questions

Q: How often should the serpentine belt be replaced? A: Inspect annually and replace every 2-3 years or if cracks, fraying, or glazing appear.

Q: Can this belt be used on a 2-cylinder Optimax? A: No, it is specifically designed for 3-cylinder DFI 75-125HP engines; verify your engine model before purchase.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.