Volvo Penta Raw Water Pump Impeller Kit 21951342 – 6-Blade OEM
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Volvo Penta Raw Water Pump Impeller Kit – Part No. 21951342
Part Number: 21951342
Brand: Volvo Penta
Supersedes: 3586496
Replaced By: Current – 21951342 is the active OEM number
Overview
This is a genuine Volvo Penta OEM impeller kit for raw-water (seawater) pump service on older Volvo Penta diesel and gasoline marine engines. The kit includes a 6-blade impeller with slotted shaft pin drive, along with the gasket(s) and impeller lubricant needed for a complete pump service. As an OEM kit, all components are matched to the original pump specifications for fit, blade count, and drive type.
System
Raw-Water / Seawater Cooling System – Impeller Pump. This kit services the raw-water pump impeller on the applicable engine, which is the primary component responsible for circulating seawater through the cooling circuit.
Kit Contents
- 1 x 6-blade raw water pump impeller (slotted shaft pin drive)
- Pump cover gasket(s)
- Impeller lubricant
Compatible Applications
- Volvo Penta 2001, 2001R
- Volvo Penta 2002, 2003, 2003R
- Volvo Penta D2003AG
- Volvo Penta MD1A, MD1B
- Volvo Penta MD2A, MD2B
- Volvo Penta MD3B
- Volvo Penta MD5A, MD5B, MD5C
- Volvo Penta MD6A
- Volvo Penta MD7A, MD7B
- Volvo Penta MD11C, MD11D
- Volvo Penta MD17C, MD17D
- Volvo Penta MB10A
- Volvo Penta AQD2B
- Other Volvo Penta engines using the compatible 4-screw lid raw-water pump – confirm by engine serial number and pump diagram
Serial Number & Fitment Notice
Fitment varies by engine family, pump version, and pump cover style. Always confirm part number 21951342 against your engine serial number and the correct Volvo Penta raw-water pump diagram before ordering — particularly on older engines where pump revisions or cover changes may exist. The pump cover style (4-screw lid) and drive type (slotted shaft pin) are key identifiers for this impeller.
Superseded Part Numbers
Earlier part number 3586496 has been updated to 21951342. Use 21951342 as the current OEM ordering number.
Service Interval
Volvo Penta recommends raw-water pump impeller replacement annually or every 200–300 hours, whichever comes first. In saltwater or high-use applications, annual replacement is strongly recommended regardless of hours. Do not wait for cooling symptoms — a degraded impeller can shed blade fragments that travel downstream and damage heat exchangers or thermostats.
When to Replace
Replace this impeller kit when the existing impeller shows cracked or missing vanes, hardening, permanent set in the blades, reduced cooling water flow, or any overheating symptoms. Replace the gaskets and apply fresh lubricant at the same time — both are included in this kit for that reason.
Installation Notes
Confirm the pump cover style (4-screw lid) and drive type (slotted shaft pin) match before disassembly. Apply the included lubricant to the impeller before insertion — dry installation can damage the blades immediately on first start. Inspect the pump housing bore for scoring or wear at the same time. Replace the pump cover screws if they show corrosion or thread wear.
Technical FAQ
Q: Can I reuse the old gasket if it looks intact?
A: Not recommended. Gaskets compress during initial installation and rarely seal correctly when reused. This kit includes a replacement gasket for that reason.
Q: How do I know if my impeller has failed?
A: Common signs include engine overheating, reduced raw-water flow at the exhaust, or visible blade damage when the pump cover is removed. In many cases the impeller looks intact but has lost flexibility — a blade that does not spring back when bent has already hardened and should be replaced.
Q: What happens if a blade breaks off?
A: Broken impeller blades travel through the cooling circuit and can lodge in heat exchangers, thermostats, or other restrictions. If you find a damaged impeller with missing blades, flush the cooling circuit and inspect downstream components before returning the engine to service.
Related Parts
- Volvo Penta Seawater Pump Wear Kit 21951374 – wear components for the seawater pump family
- Volvo Penta Seawater Pump Screw Kit 21951302 – pump cover screws for D1/D2/MD series
- Volvo Penta Seawater Pump Cover Screw Kit 21951334 – pump cover screws for D3/D4/D6/KAD/TAMD
- Johnson Pump 09-808B-1 Impeller Kit – aftermarket cross-reference impeller kit
Parts Desk Insights
This impeller kit is the most common annual service item on the 2001/2002/2003 and MD5–MD17 engine families. The most frequent mistake is matching the impeller by diameter or blade count alone without confirming the pump cover style and drive type — a slotted shaft pin drive impeller will not work in a keyed-shaft pump, and vice versa. Always confirm the pump lid style (4-screw) and drive type before ordering. If you are unsure, pull the pump cover first and match the existing impeller before placing the order.
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.