Johnson Pump F75B Neoprene Impeller 09-821BT-1 | 189-09821BT1

Part Details

• Part Number: 09-821BT-1 (also referenced as 09821BT1, 09-821BT)
• Distributor SKU: 189-09821BT1
• Brand: Johnson Pump / SPX FLOW (Genuine OEM-quality replacement)
• Official Product Type: Flexible Neoprene Impeller
• Pump Fit: Johnson Pump F75 / F75B flexible impeller pump
• Associated Pump Numbers: 10-24413-01, 10-24413-02, 10-13306-01
• Blade Count: 12 flexible blades
• Rubber Compound: MC97 neoprene
• Hub Configuration: Threaded
• Diameter (approx.): 2.56 in. / 65 mm
• Depth (approx.): 3.15 in. / 80 mm
• Weight (approx.): 200 g
• System: Raw-water cooling circuit

Compatible Applications

Fitment is pump-specific. Verify using the pump model number on your engine before ordering. Documented engine applications include:

• Volvo Penta TAMD63L-A
• Volvo Penta TAMD63P-A
• Yanmar 6LY2
• Yanmar 6LY3
• MAN D2866LE (selected applications)
• Hino W06D-T1 (selected applications)

Associated Pump & Cross-Reference Numbers

• Johnson Pump 10-13306-01
• Johnson Pump 10-24413-01
• Johnson Pump 10-24413-02
• MAN 51.06500-7023
• MAN 51.06500-7034
• Yanmar 119578-42501
• Yanmar 119578-42551 (referenced cross number)
• Volvo Penta 3836563
• Volvo Penta 3825113 (referenced previous/cross number)

Serial Number & Fitment Notice

Confirm the water-pump model number and your engine serial number before ordering. Flexible impellers can share similar diameters while differing in hub style, blade count, depth, or shaft attachment method. The most reliable match is the pump number stamped on the pump body, or the original impeller part number 09-821BT-1.

Service Interval

Johnson Pump recommends inspecting the impeller at least annually or every 250–300 engine hours, whichever comes first. In high-duty-cycle or commercial applications, more frequent inspection is advisable. Replace proactively rather than waiting for a cooling alarm — impeller failures can leave blade fragments in the cooling circuit.

When This Part Needs Replacement

Inspect and replace if the blades show any of the following:

• Cracking or splits at the blade roots
• Permanent bending or set (blades that won't spring back)
• Missing blade sections
• Hardening or loss of flexibility
• Excessive wear on the blade tips
• Heat damage from running the pump dry

Installation Notes

Before fitting the new impeller, inspect the pump chamber, wear plate, cam, cover plate, shaft, and seals for scoring or damage. Lubricate the impeller with an approved impeller lubricant — never petroleum grease. Confirm the threaded hub engages cleanly with the F75 pump shaft before closing the cover plate.

Important: If the old impeller is missing blades, trace and recover all fragments from the downstream cooling circuit and heat exchanger before returning the engine to service. Fragment ingestion can block heat exchanger tubes and cause overheating.

Related Parts

• Yanmar Seawater Pump Impeller Kit 119574-42530
• Yanmar Seawater Pump Impeller Kit 119578-42750
• Yanmar Pump Impeller 119593-42202
• Volvo Penta Raw Water Pump Impeller Puller Screw 3843949
• Jabsco Neoprene Impeller Kit 920-0001-P
• Browse all Impellers

Parts Desk Insights

With flexible impellers, pump identification is more reliable than engine model alone — two engines in the same family can have different pump configurations depending on build date and market. If the pump body is marked 10-24413-01 or 10-24413-02, that is a strong match for this F75B impeller. The MC97 neoprene compound in this impeller is specifically formulated for raw-water service and resists swelling better than generic rubber — a common failure point with non-OEM substitutes. If the old impeller has lost any blades, locate the missing pieces before running the engine again; a blocked heat exchanger from a missing blade is a much costlier repair than the impeller itself.