Sierra Impeller Kit 23-3304 – Volvo Penta SX / DP-S Drive Water Pump Service Kit
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You have 30 days to request a return. All sale items are final sale.
The Sierra 23-3304 Impeller Kit is a complete water pump service kit designed for Volvo Penta SX and DP-S sterndrive lower units. This kit restores proper raw water flow from the drive to the engine, ensuring reliable cooling performance and preventing overheating.
Installed in the outdrive water pump housing, the impeller is responsible for pulling water from below the boat and delivering it to the engine. Over time, the rubber vanes wear, harden, or break, reducing cooling efficiency.
This kit includes the essential components needed to service the pump and maintain optimal performance in both freshwater and saltwater conditions.
Key Features
- Complete sterndrive water pump impeller kit
- Includes impeller, gaskets, seals, and key components (varies by application)
- Restores proper water flow from drive to engine
- Direct replacement for Volvo Penta SX and DP-S drives
- Marine-grade rubber impeller with precision fit
- Sierra limited lifetime warranty
Engine / Drive Compatibility
Volvo Penta Sterndrives
- SX Drives
- DP-S Drives
➡️ Fits drives paired with:
- 3.0L
- 4.3L
- 5.0L
- 5.7L
- 7.4L
- 8.1L
(GM-based marine engine platforms using SX / DP-S drives)
Serial Number Fitment Notice
Fitment depends on:
- Exact drive model (SX vs DP-S variants)
- Year and gearcase configuration
⚠️ Always confirm using:
- Drive serial number
- OEM part number match
When This Part Needs Replacement
Replace the impeller kit if you notice:
- Weak or no water flow
- Engine overheating
- Reduced cooling at idle
- Cracked, missing, or hardened impeller vanes
- After seasonal storage
Recommended service interval: every 100 hours or annually
Installation Notes
- Installed in the lower unit water pump housing
- Always inspect housing and wear plate for scoring
- Lubricate impeller during installation
- Install vanes in correct rotation direction
- Replace all seals and gaskets included
Alternate / Superseded Part Numbers
OEM Cross References
- Volvo Penta:
- 21951356
- 3586496
- 3862281
Aftermarket Cross References
- Mallory: 9-45621
- GLM: 12072
Shipping
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
💡 Parts Desk Insight
On SX and DP-S drives, the impeller is buried in the lower unit—so it often gets skipped. But if it fails, you lose cooling fast.
Replacing it regularly is cheap insurance against overheating and keeps your drive performing properly 👍
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.