Sierra 18-3075 Neoprene Impeller Kit | 12-Fin, 2-1/4 in. | Volvo Penta 875575 / Johnson 09-801B
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Sierra 18-3075 Neoprene Impeller Kit
Part Number: 18-3075 (Sierra) | Catalog Number: 47-3075 | Brand: Sierra
Sierra 18-3075 is a 12-fin neoprene flexible impeller kit for selected Volvo Penta and Johnson Pump / Jabsco raw-water pump applications. It restores proper seawater circulation when the original impeller has become worn, hardened, cracked, or damaged.
The impeller measures approximately 2-1/4 in. / 57.2 mm outside diameter and 1-1/4 in. / 31.8 mm wide, and directly cross-references Volvo Penta 875575 and 21951350, Johnson Pump 09-801B, and Jabsco 4568-0001 and 2877-0001.
Specifications
- Manufacturer Part Number: 18-3075
- Catalog / Item Number: 47-3075
- Brand: Sierra
- Product Type: Flexible Impeller Kit
- Material: Neoprene
- Fins / Blades: 12
- Outside Diameter: 2-1/4 in. / 57.2 mm
- Width: 1-1/4 in. / 31.8 mm
- System: Marine engine raw-water (seawater) cooling pump
- UPC: 30999315274
Compatible Applications
Fitment is determined by the installed seawater pump model or existing impeller number, not by engine displacement alone. Confirmed cross-references:
- Volvo Penta 875575
- Volvo Penta 21951350
- Johnson Pump 09-801B
- Jabsco 4568-0001
- Jabsco 2877-0001
- GLM 89530
- Mallory 9-45701
- Oberdorfer B6620
Before ordering, confirm the existing pump model or original impeller part number. Marine flexible impellers can have nearly identical outside diameters while differing in width, hub style, or blade count — match by number, not by appearance.
Fitment Notice
Before ordering, verify all of the following match the existing impeller or pump specification:
- 12 fins / blades
- Outside diameter: 2-1/4 in. / 57.2 mm
- Width: 1-1/4 in. / 31.8 mm
- Neoprene compound (for clean fresh water, salt water, and standard engine-cooling circuits)
- Original reference: Volvo Penta 875575, Johnson 09-801B, or Jabsco 4568-0001 / 2877-0001
Service Interval
Inspect the impeller at each annual cooling-system service. Replace immediately when any of the following are observed:
- Reduced or absent raw-water flow at the exhaust outlet
- Rising engine temperature during operation
- Blades cracked, torn, hardened, or permanently set
- Blade tips or material missing — inspect all downstream hoses, heat exchangers, and oil coolers before fitting the replacement
- Pump has operated dry (replace immediately)
- Impeller service history is unknown
- Annual preventive service interval reached
Installation Notes
- Close the raw-water intake seacock before disassembly
- Remove the pump cover and extract the old impeller — inspect all blades and account for any missing pieces before proceeding
- Inspect the pump bore, cam surface, shaft, and cover plate for scoring or wear
- Remove all fragments of the previous impeller from the pump body and downstream passages
- Lubricate the impeller blades and bore with glycerin or dish soap — do not use petroleum-based lubricants
- Install the new impeller, aligning the hub to the drive shaft, and press fully into the bore
- Replace the cover gasket from the kit
- Open the seacock and confirm strong water flow at the exhaust immediately after startup
Cross-Reference Part Numbers
- Sierra: 18-3075
- Catalog ref: 47-3075
- Volvo Penta: 875575
- Volvo Penta: 21951350
- Johnson Pump: 09-801B
- Jabsco: 4568-0001
- Jabsco: 2877-0001
- GLM: 89530
- Mallory: 9-45701
- Oberdorfer: B6620
- UPC: 30999315274
Related Products
- Jabsco 4568-0001-P Profile K Neoprene Impeller Kit — Jabsco OEM equivalent kit for this impeller family
- Volvo Neoprene Impeller Kit — OEM-style Volvo Penta impeller kit
- Jabsco 1210-0001-P Neoprene Impeller Kit — related Jabsco impeller kit for the 1210-series pump family
Parts Desk Insights
Best use case: Sierra 18-3075 is the correct annual-service impeller for Volvo Penta raw-water pump applications specifying 875575 or 21951350, and for any Johnson Pump or Jabsco pump calling for 09-801B, 4568-0001, or 2877-0001. It's a well-stocked aftermarket kit at a reliable price point when OEM lead times are long.
Common issues: The most frequent ordering mistake with this family is selecting by outside diameter alone — several other impellers share the 57 mm diameter but differ in width or hub type and are not interchangeable. The 1-1/4 in. width and 12-fin count are the key differentiators. Always start with the number on the existing impeller or pump tag. If blade pieces are missing after removal, inspect the full downstream circuit — thermostat housing, oil cooler, and heat exchanger — before fitting the new impeller.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.