Description
Johnson 09-812B Raw Water Pump Impeller Kit – Indmar / Malibu / MasterCraft / Supra
OEM replacement Johnson 09-812B impeller service kit for engines equipped with the Johnson F6B raw water pump. Designed for reliable cooling performance and long service life. A worn impeller can cause overheating and engine damage, so manufacturers recommend replacing it every 100 hours or once per season.
Key Features
- Genuine SPX Johnson Pump impeller
• Designed for maximum water flow and durability
• OEM replacement for Indmar marine engines
• Helps prevent engine overheating and cooling system failure
• Recommended annual or 100-hour service replacement
Common Boat Compatibility
- Malibu boats with Indmar engines (1996–present)
• Most MasterCraft boats (1987 until the change to Ilmor engines in 2011)
• Malibu boats (1994–present)
• Supra, Moomba, MasterCraft, and Tige with Indmar engines
• Axis Wake boats with 5.7L Challenger engines
⚠️ Note:
• Will NOT fit MerCruiser engines
• Axis boats with 6.0L Challenger use a different impeller
Compatible Indmar Engines
- Monsoon 320 / 325 / 330 / 335 / 340 / 350 HP
• Hammerhead 365 / 380 / 383-400 HP
• Indmar Carbureted, LCR, LTR, and 8.1L engines
• Indmar Raptor 6.2L (400 / 450 / 575)
Kit Includes
- Impeller
• Cover plate gasket
• O-ring (not used in most applications)
• Glycerin lubricant for installation
Impeller Specifications
- Fits Johnson F6 Series Pumps
• Material: MC97 Neoprene
• Outer Diameter: 2-1/4"
• Depth: 1-7/8"
• Spline shaft center
Part Numbers
• Johnson: 09-812B / 09-812B-1 / 812
• Indmar: 685007 / S685007
• Replaces Johnson 812
• Also fits DJ Pump 09-105-1201
