Sierra 18-45312
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Sierra 18-45312 Product Description
Keep your compact outboard running cool and reliable with this precision-engineered replacement impeller. Designed specifically for smaller Evinrude and Johnson engines, it restores optimal water pump performance, preventing overheating during those long days on the water. Crafted from durable, high-quality rubber compound, it flexes just right to maintain strong water flow while resisting wear from sand, debris, and constant use.
Boat enthusiasts know that a worn impeller can lead to costly engine damage. This direct-fit upgrade slots in seamlessly, matching original specifications for hassle-free restoration. Whether you're prepping for fishing trips, lake outings, or trailering to new waters, swapping in this impeller ensures your motor stays primed and protected.
Perfect Fit for Your Engine
Engineered to match factory standards, this impeller is compatible with Evinrude and Johnson 2-3HP models spanning 1991 through 1999. It works across various configurations in this power range, including popular tiller-handle setups common on small fishing boats and dinghies. Always cross-reference your engine's serial number to confirm fitment, as minor variations exist within model years.
- 2HP models (1991-1999)
- 3HP models (1991-1999)
- Suits both 2-stroke and compatible carbureted designs
- Replaces OEM equivalents for cost-effective maintenance
Pro tip: Inspect your lower unit during annual servicing. If the vanes look cracked, glazed, or deformed, it's time for a refresh—especially if your boat sees saltwater exposure or infrequent flushes.
Why This Impeller Outperforms the Rest
Unlike generic parts that swell or degrade prematurely, this impeller uses a proprietary neoprene blend optimized for marine environments. It delivers consistent pump pressure, ensuring coolant circulates efficiently to vital components like the powerhead and exhaust. Users report smoother idling and better top-end performance post-install, with longevity stretching seasons longer than stock replacements.
Key Advantages:
- Superior Material Durability: Resists heat, oil, and abrasion for extended service life.
- Exact OEM Geometry: Vanes and hub mimic factory design for plug-and-play reliability.
- Easy Annual Swap: Reduces downtime and keeps maintenance budgets in check.
- Enhanced Cooling Flow: Up to 20% better water volume in tests, based on boater feedback.
Maintenance Best Practices
To maximize lifespan, flush your engine with fresh water after every saltwater run. Rotate the impeller monthly during storage to prevent flat-spotting. Pair with a new wear plate or key if your pump shows scoring—common in gritty waters. Store spares in a cool, dry place away from direct sunlight to avoid premature hardening.
Quick DIY Installation Guide
Replacing your impeller is a straightforward 30-minute job with basic tools. Drain the lower unit gear oil first, then remove the pump housing bolts. Gently pry out the old impeller using needle-nose pliers—avoid twisting to prevent shaft damage. Lubricate the new one generously with marine grease, align the keyway, and press it onto the shaft with a twisting motion toward the intake side.
- Disconnect battery and tilt motor up.
- Remove lower unit (four bolts typically).
- Extract water pump assembly.
- Install new impeller and inspect liner/cup.
- Reassemble, refill gear lube, test-run in a barrel.
"Switched mine out last season—noticed immediate improvement in pee stream flow. No more worrying about cooking the motor on hot afternoons." – Experienced angler review
Frequently Asked Questions
What engines does this impeller fit?
It fits Evinrude and Johnson 2-3HP outboards from 1991 to 1999. Check your model and serial for exact match.
How often should I replace the impeller?
Inspect annually; replace every 1-2 years or 100 hours, sooner in harsh conditions like saltwater.
Is this impeller made of rubber or another material?
High-grade neoprene rubber, flexible and resistant to marine wear factors.
Can I install it myself?
Yes, with common tools and care. Follow a service manual for your model to avoid misalignment.
Does it come with installation hardware?
Impeller only; reuse existing hardware unless worn. Consider a full pump rebuild kit for completeness.
What if my engine is from outside 1991-1999?
Verify compatibility via serial number. Similar impellers exist for adjacent years.
Will this improve my engine's cooling?
Absolutely—a fresh impeller boosts water flow, reducing overheat risks significantly.
Save $4 when you buy the Sierra 18-45312 for only $28 from NVN Marine! Same day shipping before 3pm.
Sierra 18-45312 Technical Specifications
| Type: | |
|---|---|
| Vendor: |
Sierra Engine Parts |
| Weight: |
0.1 lb |
Sierra 18-45312 User Reviews
Sierra 18-45312 Shipping & Return
| Shipping Weight: |
0.1 lb |
|---|---|
| Box Sizes: |
0.00 (h) x 4.00 (w) x 5.00 (l) |
| Cubic Feet: |
0.0 |
| Returnable: |
Yes |
For detailed shipping policy please check our Shipping Policy and you can find our Return and Refund Policy here.