Sierra 18-3081 Volvo Neoprene Impeller Kit

Keep your Volvo Penta engine running cool and reliable on the water with the Sierra neoprene impeller kit. Designed as a direct replacement for demanding marine environments, this kit delivers the pumping power your boat needs without the hassle of frequent swaps. Boat enthusiasts know that a worn impeller can lead to overheating disasters mid-trip—don't let that be you.

Superior Durability Meets Marine Demands

Neoprene construction stands out for its resistance to heat, ozone, oils, and chemicals commonly found in raw seawater. Unlike cheaper rubber alternatives that swell or crack prematurely, this impeller maintains flexibility and shape even after prolonged exposure. The kit includes all necessary components: impeller, outer housing liner, inner hub, and O-rings for a complete rebuild.

• High-flex neoprene resists deformation under pressure
• Precision-molded vanes for optimal water flow and cooling efficiency
• Corrosion-resistant hardware ensures longevity in saltwater
• Balanced design minimizes vibration and wear on pump shaft

Seamless Fit for Volvo Penta Systems

Engineered to match original Volvo specifications, this kit slots right into your water pump assembly. It's the go-to choice for mechanics servicing inline and V-drive setups where consistent cooling is non-negotiable. Regular impeller checks during annual servicing prevent the all-too-common "no water telltale" issue that strands boaters.

Step-by-Step Installation Without the Frustration

Swapping out an impeller shouldn't require a marine yard overhaul. Here's a proven approach using basic tools:

1. Drain the cooling system and remove the pump cover—twist counterclockwise while prying gently.
2. Extract the old impeller with needle-nose pliers or a dedicated puller; note any debris in the housing.
3. Lubricate the new impeller with marine grease or soapy water—never petroleum-based products.
4. Align the keyway, press in by hand while rotating clockwise to flex vanes into place.
5. Reassemble with fresh O-rings, torque to spec, and test-run with a hose before hitting the water.

Pro tip: Mark your calendar for replacement every 2-3 years or 200 hours, whichever comes first, especially in silty or debris-heavy waters.

Maximize Performance with Smart Maintenance

Spot early warning signs like reduced pee stream from the exhaust, engine temp spikes, or rubber bits in the strainer basket. Flush your cooling system post-use with fresh water to rinse salt buildup. Pair this impeller with a raw water strainer upgrade for peak reliability. Owners report 30% longer life when avoiding dry-running the pump during winterization.

Why Boaters Trust Sierra for Replacements

Sierra's reputation stems from rigorous testing that exceeds industry standards—think cavitation resistance and flow rate validation. It's not just a part; it's peace of mind for weekend warriors and charter captains alike. Skip the OEM markup and get equivalent (or better) performance that keeps you on the water, not in the shop.