Sierra 18-4558

Revitalize Your Outboard's Cooling System with Precision

Keeping your outboard motor's water pump in top shape is crucial for preventing overheating during those long days on the water. A failing water pump can lead to engine damage, lost fishing trips, or unexpected breakdowns far from shore. This repair kit steps in as your go-to solution, delivering reliable components that restore full cooling efficiency without the need for a full pump replacement.

Crafted for durability in harsh marine environments, the kit features high-quality materials that resist corrosion, wear, and the constant exposure to saltwater. Whether you're dealing with a sluggish impeller, worn seals, or degraded gaskets, these parts ensure a like-new performance that keeps coolant flowing smoothly.

Key Components for a Complete Rebuild

• Impeller: Flexible and resilient, designed to maintain optimal water flow even under high RPMs.
• Wear Plate: Protects the pump housing from abrasion, extending overall service life.
• Gaskets and Seals: Precision-cut for leak-free operation, preventing air pockets that reduce efficiency.
• Key Hardware: Includes necessary fittings and clips for a secure, hassle-free assembly.

Every piece is engineered to meet or exceed original equipment standards, making it a smart choice for boaters who demand performance and peace of mind.

Perfect Fit for Popular Outboard Models

Engineered for seamless compatibility with a range of mid-range outboard engines from leading brands, this kit fits models commonly found in recreational boating. It addresses the specific tolerances of gearcase water pumps, ensuring proper alignment and function right out of the box. Always cross-reference your engine's service manual to confirm fitment for your setup.

Why This Repair Kit Stands Out in Marine Maintenance

Unlike basic rebuild options, this kit prioritizes longevity with neoprene impellers that flex without cracking and stainless steel-backed plates for superior strength. Boaters report fewer pump failures after installation, thanks to the kit's resistance to cavitation and thermal stress. It's an investment that pays off in reliable starts, cooler running temps, and fewer tow bills.

Ideal for annual servicing or as a proactive fix before symptoms like steam from the tell-tale appear. Pair it with fresh gear lube for comprehensive lower unit care.

Step-by-Step Installation Tips for DIY Success

1. Drain the gearcase oil and remove the lower unit from the engine.
2. Disassemble the water pump housing carefully, noting the orientation of old parts.
3. Clean all mating surfaces thoroughly to remove old gasket material and debris.
4. Install the new wear plate, followed by the impeller—twist it clockwise while lubricating with soapy water for easy seating.
5. Reassemble with fresh gaskets, torque to spec, and test flush before full operation.

Pro tip: Work in a well-lit area and use anti-seize on bolts to ease future maintenance. Most installs take under an hour with basic tools like a socket set and gearcase splitter.

Preventive Maintenance to Extend Pump Life

Regular checks can spot issues early: Monitor the tell-tale stream for steady flow, inspect for impeller chunks in the strainer, and service every 100 hours or annually. Flush with fresh water after saltwater use to minimize buildup. This kit shines in routine overhauls, keeping your outboard ready for adventure.

Frequently Asked Questions