Sherwood 09959K Impeller Kit
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The Sherwood 09959K Impeller Kit is a complete raw water pump service kit designed for Sherwood pump systems used in marine engine cooling applications. This kit includes a precision-molded neoprene impeller along with multiple gaskets and an O-ring to ensure proper sealing and reliable water flow.
Built with a marine-grade neoprene impeller and a brass hub with a keyed drive, this kit delivers excellent durability and performance in both freshwater and saltwater environments. Replacing a worn impeller helps restore cooling efficiency, prevent overheating, and protect critical engine components.
This is a very common Sherwood impeller for gasoline inboards and light diesel applications, especially in PCM, Crusader, and Chrysler marine engines.
Key Features
- Genuine Sherwood impeller service kit
- Marine-grade neoprene rubber construction
- 12-blade flexible impeller design
- Brass hub with 5/8" keyed shaft (3/16" keyway)
- Includes multiple gaskets and O-ring
- OEM-spec fit and performance
Engine Compatibility
PCM (Pleasurecraft Marine)
- GM 5.0L / 5.7L / 8.1L
- Ford-based PCM engines (belt-driven pumps)
- Pre-2004 crank-driven systems (non-serpentine)
Crusader Marine Engines
- Interceptor series
- GM-based V6 & V8 engines
Chrysler Marine Engines
- 318 / 340 / 360
- 383 / 413 / 440
Chris-Craft Marine Engines
- Model 350 and various classic V8 platforms
Gray Marine Engines
- Fireball V8
- Compact V8 and 6-cylinder engines
Perkins Diesel Engines
- 4-108
- 4-154
Onan Marine Generators
- Diesel and gasoline generator sets using Sherwood pumps
Universal / Westerbeke
- Light plant and marine diesel applications
OMC / Volvo Penta (Pump-Based Fitment)
- Select 4, 6, and 8-cylinder engines using Sherwood pumps
Sherwood Pump Compatibility (Primary Fitment)
Fits a wide range of Sherwood pumps, including:
A03, A16
B06
D55*, D60**, D65**, D75**
F15, F85
G1, G2, G15, G20, G21, G22
G30-2, G30-2B, G65, G95-1
G9901, G9902, G9903
H5, H10
J70, J90
K75, K75B
L9920G, L9930G
M10065G, M10180G, M10210G, M10263G, M10264G, M10270G, M10280G
N10390G**, N10410G, N10460, N10470, N10510G
P10550G*, P10560G**, P10610G, P10650G, P10700G, P10710G**
Q10755G, Q10765G, Q10770G, Q10855G**
R50G, R991, R10870G, R10920G, R10925G, R10930G, R10935G**, R10955G
RPGC
* Some pumps use 09959K + 10615K combo
** Some pumps use dual 09959K impellers
Serial Number Fitment Notice
Fitment depends on:
- Pump model
- Shaft size (5/8" keyed shaft required)
- Engine application
⚠️ Always confirm compatibility using your pump model or engine serial number before ordering.
Impeller Specifications (Fitment Critical)
- Diameter: 2-7/16" (61–62 mm)
- Width: 1-1/4" (31–32 mm)
- Shaft: 5/8" keyed
- Keyway: 3/16"
- Blade Count: 12 blades
- Material: Neoprene rubber with metal hub
What’s Included in the Kit
- Impeller
- O-ring
- Multiple gaskets (varies by kit version)
When This Part Needs Replacement
Replace the impeller if you notice:
- Reduced or no cooling water flow
- Engine overheating
- Cracked, missing, or stiff vanes
- Reduced performance under load
Recommended service interval: every 100 hours or annually
Installation Notes
- Lubricate impeller before installation
- Install with correct vane direction
- Ensure key is properly seated
- Replace all included gaskets and O-rings
- Inspect pump housing and wear plate
Alternate / Superseded Part Numbers
OEM Cross References
- Sherwood: 09959K
- Replaces: 09959, 10685, 10687, 11422, 18656
Aftermarket Cross References
- Sierra: 18-3061 / 18-3084 (verify)
- JMP: Equivalent applications (verify)
- Jabsco: Cross application (verify)
Shipping
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
💡 Parts Desk Insight
The 09959K is one of the most widely used Sherwood impellers in gas inboards. The key identifier is the 2-7/16" diameter + 5/8" keyed shaft—and note that some pumps run it paired with a 10615K, which is a common source of confusion 👍
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.