Sierra 18-3244 Impeller Kit
Shipping (3PM)
Within 30 days
Sierra 18-3244 Impeller Kit Product Description
Keep your outboard motor running cool and reliable with the Sierra 18-3244 Impeller Kit. Designed as a direct replacement for OEM water pump impellers, this kit tackles the common culprit behind overheating issues—worn-out impellers that fail to circulate water effectively. Boat owners know the frustration of a sudden breakdown on the water, but with this high-quality aftermarket solution from Sierra Engine Parts, you get peace of mind without compromising performance.
Why the Sierra 18-3244 Stands Out
Crafted from durable neoprene rubber with precision-molded vanes, the 18-3244 impeller delivers superior water flow and longevity compared to stock parts that degrade under heat and debris. The kit includes everything needed for a seamless swap: the impeller, housing liner if applicable, and key hardware for most compatible setups. It's engineered to handle the rigors of saltwater and freshwater environments, resisting swelling, cracking, or glazing even after extended use.
Key Advantages for Boaters
- Enhanced Cooling Efficiency: Optimized vane design pumps more water faster, reducing engine temps by up to 20% in demanding conditions.
- Easy Maintenance: No special tools required; install in under 30 minutes with basic boating know-how.
- Cost-Effective Reliability: Matches or exceeds OEM specs at a fraction of the cost, saving you hundreds on repairs.
- Universal Fit Assurance: Replaces multiple Mercury part numbers, eliminating guesswork for legacy engines.
Perfect Fit for Your Engine
The Sierra 18-3244 Impeller Kit is tailored for Mercury and Mariner 4-cylinder outboards in the 90-125 HP range, covering models from 1982 to 1990. It slots right into water pump housings on popular setups like the 110 HP inline fours and 120 HP powerheads. Always cross-check your engine's serial number against the lower unit specs to confirm—common replacements include OEM numbers 43021A6, 48-43021A25, and similar variants. This kit breathes new life into older motors that original impellers can't match anymore.
Step-by-Step Installation Tips
Replacing your impeller is a straightforward DIY job that prevents bigger headaches. Here's a pro-tested guide:
- Prep Work: Tilt the motor up, remove the lower unit (four bolts typically), and drain any water. Inspect the old impeller for wear patterns like chunks missing or flat spots.
- Disassemble: Pry out the old impeller with pliers or a hook tool—twist gently counterclockwise while pulling downward.
- Lube and Install: Apply marine grease liberally to the new 18-3244 impeller. Align the keyway, slide it onto the driveshaft, and rotate clockwise to seat it fully.
- Reassemble: Torque housing bolts to spec (around 75-100 in-lbs), reinstall the lower unit, and test flush the system on muffs before hitting the water.
- Pro Tip: Flush with fresh water after every saltwater trip to extend impeller life dramatically.
New to this? Watch for common pitfalls like dry-fitting without lube, which can tear vanes on startup.
Maximize Longevity with Smart Habits
To get seasons of trouble-free operation from your Sierra 18-3244, inspect it annually or every 100 hours. Look for glazing (shiny vanes), swelling, or debris buildup. Run the motor on a hose for 5 minutes post-install to break it in. In murky waters, pair with a strainer screen to block weeds and sand. Owners report 2-3 years of service in harsh conditions—far outpacing neglected OEMs.
Frequently Asked Questions
What engines is the Sierra 18-3244 Impeller Kit compatible with?
It fits Mercury and Mariner 90-125 HP 4-cylinder outboards from 1982-1990, replacing OEM part numbers like 43021A6 and 48-43021A25. Verify by engine serial number.
How often should I replace my outboard impeller?
Inspect yearly or every 100 hours; replace if worn, typically every 1-3 years depending on usage and water conditions.
Is the Sierra 18-3244 a direct OEM replacement?
Yes, it's engineered as a drop-in replacement with matching dimensions and material specs for reliable performance.
Can I install the 18-3244 Impeller Kit myself?
Absolutely—most boaters complete it in 20-40 minutes with basic tools. Follow the step-by-step guide and use plenty of lube.
What are signs my impeller needs replacing?
Low water pressure from tell-tale, overheating alarms, rubber chunks in pee stream, or visible vane damage.
Does this kit include all necessary parts?
Yes, it comes complete with impeller, key, and often a liner or O-rings for full assembly.
Will this impeller work in saltwater?
Neoprene construction handles saltwater excellently; flush regularly to prevent salt buildup.
Save $5 when you buy the Sierra 18-3244 Impeller Kit for only $31 from NVN Marine! Same day shipping before 3pm.
Sierra 18-3244 Impeller Kit Technical Specifications
| Type: | |
|---|---|
| Vendor: |
Sierra Engine Parts |
| Weight: |
0.26 lb |
Sierra 18-3244 Impeller Kit User Reviews
Sierra 18-3244 Impeller Kit Shipping & Return
| Shipping Weight: |
0.26 lb |
|---|---|
| Box Sizes: |
1.00 (h) x 6.00 (w) x 7.00 (l) |
| Cubic Feet: |
42.0 |
| Returnable: |
Yes |
For detailed shipping policy please check our Shipping Policy and you can find our Return and Refund Policy here.