Sierra 18-3155

Keep your Mercruiser Bravo sterndrive running cool and reliable on every outing with the Sierra Bravo seawater pump. Designed as a direct-fit replacement, this pump pulls in fresh seawater to circulate through your engine's cooling system, preventing overheating during those long days on the water. Boaters trust Sierra for its precision engineering that matches or exceeds OEM standards, ensuring seamless performance without the premium price tag.

Key Features That Stand Out

• Robust Construction: Built with high-grade bronze and stainless steel components for superior corrosion resistance in saltwater environments.
• Impeller Excellence:
Features a durable neoprene impeller that delivers consistent flow rates, even under high-demand conditions like towing skiers or cruising at speed.
• Easy Maintenance Design: Quick-access housing allows for simple impeller inspections and replacements, minimizing downtime.
• Precise Fitment: Engineered to bolt directly onto Bravo One, Two, and Three drives, restoring factory-level water pressure.

Why Boaters Choose This Sierra Pump

Nothing derails a perfect boating day like a failing water pump. Symptoms like steam from the exhaust, rising engine temps, or reduced cooling efficiency often trace back to worn impellers or clogged housings. This Sierra model tackles those issues head-on, with a pump body that withstands the harshest marine conditions. Unlike stock parts that wear out quickly from sand, debris, or prolonged idling, Sierra's reinforced internals extend service life, giving you peace of mind for season after season.

Real-world feedback from captains highlights its quiet operation and vibration-free performance, which means less noise and more enjoyment. It's not just a part—it's an upgrade for reliability on lakes, bays, or open ocean runs.

Compatibility and Applications

Perfectly suited for a wide range of Mercruiser Bravo setups, this pump integrates flawlessly with popular engine configurations. It supports both raw water cooling systems and is ideal for repowers or rebuilds where restoring optimal flow is critical. Whether you're maintaining a classic Alpha/Bravo combo or a high-performance rig, it delivers the volume needed to keep V6, V8, and big-block engines chill under load.

Pro Tips for Installation and Longevity

Swapping out your old pump? Start by flushing the system to remove debris, then align the mounting studs carefully to avoid stress cracks. Use marine-grade sealant on gaskets for a leak-free seal. Post-install, run the engine on a hose with muffs to verify flow before hitting the water—watch for steady telltale stream pressure.

For peak performance, inspect the impeller annually or every 100 hours of use. Carry a spare impeller kit aboard; it's a 15-minute fix that could save your trip. Pair it with a clean raw water strainer to prevent clogs from algae or jellyfish.

Boost Your Boat's Cooling System

Investing in this Sierra Bravo seawater pump means fewer breakdowns, cooler runs, and more time making memories. It's the smart choice for DIY mechanics and pros alike, balancing quality, fit, and value in one compact package. Elevate your sterndrive's health and get back to what you love—smooth, worry-free boating.