Heurofosh Water Pump Impeller Kit for Johnson F6B-9 V8 — Neoprene Impeller with Brass Hub & Gasket

Heurofosh 09-812B-1 is a complete replacement water pump impeller kit engineered to fit Johnson F6B-9 V8 pumps and a range of Indar/Volvo/Yanmar applications for reliable raw-water circulation.

This impeller kit supplies the neoprene impeller with brass hub plus seals and a gasket so you can restore cooling flow without sourcing multiple parts separately. It replaces several OEM numbers—making it a practical spare when servicing boats with Johnson, Sierra, Indmar, Yamaha, Volvo Penta, Marine Power or Yanmar cooling systems. The kit dimensions and included hardware are designed for a direct fit where the listed part numbers and engine models align.

Which engines and pump models will this impeller kit work with?

The Heurofosh 09-812B-1 kit is compatible with Johnson F6B-9 V8 pumps and a number of Indar Monsoon models used in performance ski boats and cruisers. It also matches many Volvo Penta and Yanmar cross-references listed by OEM part numbers, so it’s suitable for marine cooling systems that specify those replacements.

• Johnson F6B-9 V8 pump compatibility
• Indar Monsoon models: 320HP–350HP (Supra, Moomba, Mastercraft, Tige)
• Cross-references: Volvo Penta, Yanmar, Sierra, Indmar, Marine Power
• Replaces OEM numbers such as Johnson 09-812B-1 and Sierra 18-3306

What parts are included in the kit and what are the key dimensions?

The kit contains the neoprene impeller with a brass hub, two O-rings, a gasket, and a drain/inspection plug so you have everything needed to complete a single impeller replacement. The impeller measures 2 1/4 inches in diameter with a width of 1.90 inches—measurements to confirm fit before installation.

• Included: 1 neoprene + brass impeller, 2 O-rings, 1 gasket, 1 plug
• Impeller size: 2.25" diameter × 1.90" width
• Direct-replace for specified OEM part numbers
• Ready for a single-unit service job without additional purchases

How do I know this will replace my current impeller part number?

Check the part numbers stamped on your existing impeller or your engine/pump parts list and compare them to the cross-reference list provided with this kit. The Heurofosh 09-812B-1 deliberately matches many common replacement numbers used across manufacturers, making visual and dimensional verification straightforward.

• Matches Johnson 09-812B-1 and Sierra 18-3306
• Compatible with Indmar S685007 and Yamaha ME420TI cross-references
• Also replaces Marine Power part numbers 524520Z and 524505A
• Measure diameter and width to confirm fit before installation

What should I inspect during impeller replacement to ensure long life?

When replacing the impeller, inspect the pump housing, sealing surfaces, and the shaft for corrosion or wear. Replace any damaged gaskets or O-rings, and ensure the new impeller spins freely in the housing without rubbing or binding.

• Check housing for scoring or corrosion
• Confirm O-rings and gasket seating and condition
• Verify shaft and coupling alignment and free rotation
• Prime and run engine briefly to confirm proper flow and no leaks

Who is this for? Boat owners, marine mechanics, and fleet managers who need a reliable, direct-fit replacement impeller for Johnson F6B-9 and compatible Indar, Volvo Penta, Yanmar, Sierra or Indmar-equipped vessels will find this Heurofosh kit convenient. It’s aimed at anyone performing routine cooling-system maintenance who prefers a single kit that includes the impeller plus seals and a plug so the job can be completed in one service visit.