Sierra 18-3100 Impeller Honda #19210-Zw9-013

Keep your Honda outboard running cool and reliable with the Sierra 18-3100 impeller, a precision-engineered replacement for the OEM Honda #19210-ZW9-013. This essential component sits at the heart of your engine's water pump, drawing in cooling water to prevent overheating during long days on the water. Boat owners swear by it for restoring peak performance without the premium cost of factory parts.

Engineered for Durability and Performance

Crafted from high-grade neoprene rubber, the Sierra 18-3100 resists hardening, cracking, and swelling—even after exposure to sand, salt, and prolonged idling. Its vanes are molded with exact tolerances to match Honda's original specs, ensuring optimal water flow and pressure. Unlike worn impellers that slip or deform, this one delivers consistent cooling from startup to full throttle, extending engine life and avoiding costly repairs.

• Exact Fit: Direct replacement for Honda #19210-ZW9-013, no modifications needed.
• Superior Materials: Flexible neoprene handles heat up to 200°F and resists petroleum-based contaminants.
• Balanced Design: Reduces vibration and wear on pump housing for smoother operation.

Spotting When It's Time for a Replacement

Overheating warnings, steam from the tell-tale, or milky oil are red flags. But smart maintenance catches issues early: Check your impeller annually or every 100 hours. A healthy one flexes easily and shows sharp, even vanes. If it's brittle, glazed, or missing chunks, swap it out before a breakdown strands you offshore. Pro tip: Always inspect the pump housing for scoring during replacement—sand ingestion is a common culprit.

Compatibility Across Honda Models

This impeller fits a range of Honda 4-stroke outboards, including popular BF40, BF50, BF75, and BF90 models from the mid-2000s onward. Verify your engine's serial number against Honda service manuals for peace of mind, but it's a go-to for mariners tackling everything from bay fishing to offshore runs.

Installation Insights from Seasoned Mechanics

Drop-in simplicity makes this a weekend warrior's dream. Drain the water from the pump, twist out the old impeller with needle-nose pliers or a dedicated tool, lube the new one with marine grease, and slide it in—clockwise for most setups. Reassemble, prime the system, and test at idle. Common pitfalls? Forgetting to align the keyway or reusing a damaged cam. Takes under an hour with basic tools, saving shop labor fees.

Why Sierra Stands Out for Boaters

Sierra's reputation shines in real-world abuse: UV exposure, ethanol-laced fuels, and neglected winter storage. Independent tests show it outlasts generics by matching OEM flow rates while flexing 20% better under stress. Pair it with fresh gear lube and a zinc anode for a bulletproof cooling system that handles tournament pressure or family cruises alike.