Volvo Penta Impeller Kit 21700445 | OEM Raw Water Pump Service Kit
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Volvo Penta OEM Impeller Kit — Raw Water Pump Service Kit
Part Number: 21700445 | SKU: 21700445
Brand: Volvo Penta | Type: OEM Raw Water Pump Impeller Service Kit
System: Raw Water (Sea Water) Cooling System
Drive Type: 5/8" Spline
Blade Count: 12-blade flexible rubber impeller
The genuine Volvo Penta OEM impeller service kit for modern V8 gasoline marine engines. This complete kit includes the impeller plus all sealing components and hardware needed for a full raw water pump service — ensuring reliable coolant flow and protecting your engine from overheating.
Kit Contents
- 12-blade flexible rubber impeller (approx. 2-1/4" diameter × 1-7/8" width)
- 5/8" spline drive hub
- Pump cover O-ring
- Additional O-rings
- Cover bolts
- Lock washers
Compatible Applications
- Volvo Penta V8-350-C-D
- Volvo Penta V8-350-CE-D
- Volvo Penta V8-380-C-A / C-B / C-D
- Volvo Penta V8-380-CE-A / CE-D
- Volvo Penta V8-430-CE-D
- Other Volvo Penta gasoline engines equipped with a compatible raw water pump — confirm by engine serial number and parts diagram
Fitment depends on engine model, pump mounting style, and serial number range. Always verify using your engine serial number before ordering.
Service Interval
Replace the impeller every 100 operating hours or annually — whichever comes first. Impeller vanes harden and crack over time, especially after dry running or extended storage. Regular replacement is the most effective way to prevent raw water pump failure and engine overheating.
Installation Notes
- Lubricate the impeller with clean water or a compatible lubricant before installation
- Install with the correct vane rotation direction — refer to your engine service manual
- Replace all included O-rings and hardware — do not reuse old seals
- Inspect the pump housing and wear plate for scoring before installing the new impeller
- Use a dedicated impeller puller tool for removal to avoid damaging the pump housing
Parts Desk Insights
Best Use Case: This kit is the go-to annual maintenance item for Volvo Penta V8 sterndrive owners. The higher blade count and splined hub on these newer V8 pumps move significantly more water at higher RPM than older designs — which means a worn or cracked impeller has a bigger impact on cooling performance. If you’re seeing cooling drop-off under load or at higher speeds, the impeller is the first place to check.
Common Questions: Customers often ask whether they need to replace the full kit or just the impeller — we always recommend replacing all included O-rings and hardware at the same time. The cost difference is minimal, and reusing old seals is a common cause of post-service leaks. Using the correct impeller puller tool also makes removal much easier and prevents damage to the pump housing.
Technical FAQ
Q: How do I know if my impeller needs replacing?
A: Common signs include reduced cooling water flow from the exhaust, engine overheating, or visible cracking and stiffness in the impeller vanes. Even if the vanes look intact, annual replacement is recommended — rubber degrades from heat and age regardless of visible wear.
Q: What happens if impeller vanes break off?
A: Broken vane fragments can travel through the cooling system and lodge in the heat exchanger or thermostat housing, causing blockages. If you find a damaged impeller, inspect the entire cooling circuit for debris before running the engine.
Q: Do I need a special tool to remove the impeller?
A: A dedicated impeller puller is strongly recommended. Trying to pry the impeller out can damage the pump housing. See the Volvo Penta Raw Water Pump Impeller Puller Screw 3843949 below.
Q: Can I reuse the old O-rings?
A: No — always replace all O-rings and seals included in the kit. Reusing compressed or aged O-rings is a leading cause of post-service cooling leaks.
Related Parts
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.