SWELL Wakesurf Creator Johnson Impeller Replacement Kit 09-812BT for Indmar Engines, MC97 Neoprene 57.1mm 48.2mm

Keeping your marine engine cooled depends on a properly functioning impeller. The Johnson 09-812BT (also referenced as 09-812B-1) is a direct-fit replacement manufactured from MC97 neoprene for Johnson SPX F6 pumps, engineered to match OEM flow and durability specifications. This kit fits a wide range of Indmar engine variants, including many Malibu and Axis applications, and is recommended for routine seasonal or 100-hour service to prevent overheating and avoid costly downtime.

Which boats and engines will this impeller kit fit?

The 09-812BT is built as an OEM substitute for many Indmar-powered boats and engines from 1996 onward. It fits Malibu boats with Indmar engines, Axis Wake models, and other vessels that use the Johnson F6B raw water pump or the listed OEM part cross-references.

• Compatible with most Indmar engine families: Raptor, Monsoon, Hammerhead, and common Vortec Marine Power blocks.
• Fits Malibu/Axis models from 1996 to present and 2019–2022+ models where housing updates match.
• Replaces multiple OEM numbers including Indmar S685007/685007, PCM RP061018, and Jabsco 13554-0001.

What material and dimensions should I expect, and why do they matter?

This impeller is molded from MC97 neoprene, selected for flexibility and resistance to marine conditions while producing reliable pump flow. Correct outer diameter, splined bore, and width are crucial to ensure a tight seal, proper rotation, and adequate water delivery to your engine's cooling passages.

• Material: MC97 neoprene for strength and flexibility in both fresh and closed-coolant systems.
• Outer diameter: 57.1 mm (2.25 inches); inner splined bore for direct shaft fit.
• Width: 48.2 mm (1.90 inches) to match Johnson SPX F6 pump housings.

How often should I replace the impeller and what maintenance helps avoid failure?

Manufacturers and marine professionals recommend inspecting or replacing the impeller annually or every 100 hours of operation, whichever comes first. If you operate in debris-filled water, abrasive conditions, or run the boat heavily, shorten the interval and keep a spare impeller aboard to prevent being stranded.

• Service interval: annually or every 100 operating hours as a baseline.
• Inspect for torn, compressed, or missing vanes before each season.
• Carry a spare impeller and basic tools for a field replacement if needed.

Does this kit replace other part numbers and work in both fresh and closed cooling systems?

Yes. The 09-812BT serves as an OEM replacement for many listed part numbers across brands and is suitable for both fresh-water direct-flow and closed-cooling setups where that impeller spec applies. Verify your pump housing and shaft spline match the dimensions to ensure compatibility.

• Cross-replaces Jabsco 13554-0001, Indmar S685007, PCM RP061018, and more.
• Correct for both freshwater and closed-cooled marine engines noted in the fitment list.
• Works with the Johnson SPX F6 pump platform when housing updates are accounted for.

Who is this for: Owners and technicians who maintain Indmar-powered boats—especially Malibu, Axis, and similar platforms—will value this SWELL Wakesurf Creator Johnson 09-812BT impeller kit. It’s aimed at people who prefer OEM-spec replacements to preserve factory cooling performance, boathouse mechanics who perform regular seasonal service, and boaters who want a reliable spare part to avoid mid-season engine overheating or costly repairs.