Why Your Outboard Needs a Reliable Impeller Like the Sierra 18-3082
In the world of boating, nothing ruins a day on the water faster than an overheated engine. The water pump impeller is the unsung hero that keeps coolant flowing through your Johnson or Evinrude outboard motor. Designed as a precise replacement for the OEM 382547 impeller, the Sierra 18-3082 delivers the durability and performance you demand from premium aftermarket parts.
Crafted from high-quality nitrile rubber, this impeller resists hardening, cracking, and swelling—even after long seasons of saltwater exposure. Boaters trust it for its vane design that matches factory specs, ensuring optimal water flow and cooling efficiency across a range of horsepower ratings.
Perfect Fit for Johnson and Evinrude Models
This impeller slots seamlessly into water pumps on various Johnson and Evinrude two-stroke outboards, covering popular models from 65HP to 150HP. It's engineered to restore factory-level performance, whether you're maintaining a classic 1980s kicker or a late-90s powerhouse. Always cross-reference your engine's service manual to confirm compatibility, as impeller specs can vary by year and model.
- Direct replacement for OEM part 382547
- Ideal for mid-range outboards in both freshwater and saltwater environments
- Compatible with vertical drive water pump housings
Key Features That Set Sierra Apart
Sierra's commitment to marine engineering shines through in every detail of the 18-3082:
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4-Lobe Vane Configuration: Provides consistent water pressure without cavitation, reducing engine stress.
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Premium Rubber Compound: Stays flexible longer than stock, fighting common failures like glazing or distortion.
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Precision-Molded Dimensions: Ensures easy installation with no modifications needed to your pump housing or keyway.
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Corrosion-Resistant: Built to handle the harsh marine environment, extending service life.
Choosing Sierra means fewer breakdowns and more time enjoying the water. It's a smarter alternative that meets or exceeds OEM standards at a fraction of the cost.
Installation and Maintenance Best Practices
Replacing your impeller is a straightforward DIY task that takes under an hour with basic tools. Here's how to get it right:
- Drain the water from your outboard and remove the lower unit.
- Disassemble the water pump housing, noting the orientation of the old impeller.
- Lubricate the new Sierra 18-3082 with marine grease and insert it, aligning the keyway properly.
- Reassemble, torque to spec, and test-run the engine on muffs to check flow.
Pro tip: Inspect annually or every 100 hours of use. Look for signs of wear like rounded vanes, chunks missing, or poor water telltale stream. Pair it with a fresh pump housing and wear plate for peak performance.
Regular upkeep prevents costly repairs—think seized pistons or warped heads from overheating.
Frequently Asked Questions
What models does the Sierra 18-3082 impeller fit?
It serves as a direct replacement for Johnson and Evinrude outboards from 65HP to 150HP two-strokes, matching OEM 382547. Verify against your engine's year and serial number.
How often should I replace my outboard impeller?
Annually for saltwater use or every two seasons in fresh water. Also swap if you notice weak water flow or engine overheating.
Is the Sierra 18-3082 made in the USA?
Sierra parts are manufactured to rigorous standards, often in the USA, using materials that outperform generics.
Can I install this impeller myself?
Yes, with common tools like snap-ring pliers and a grease gun. Follow your service manual for torque specs and alignment.
What lubricant should I use during installation?
Apply a water-resistant, high-viscosity marine grease to the vanes and hub. Avoid petroleum-based products that can swell rubber.
Does this impeller work with both Johnson and Evinrude engines?
Absolutely—it's cross-compatible for both brands where OEM 382547 is specified.
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