NorthBoat Water Pump Impeller Kit for Johnson & Evinrude 8–15 HP Outboards — Complete Seal & Hardware Set

NorthBoat 394711 Water Pump Impeller Kit is a complete replacement set designed to restore cooling and water flow for Johnson and Evinrude 8–15 HP outboard motors.

If your small outboard is showing signs of overheating, weak water stream, or rough running, the problem is often a degraded impeller inside the gearcase. This NorthBoat aftermarket kit supplies the parts you need to replace the impeller and related seals on Johnson and Evinrude models (various 8–15 HP 2- and 4-stroke engines spanning the 1970s through the early 2000s). The kit mirrors OEM compatibility numbers and includes fasteners and grommets so you can complete the job without hunting down extra components.

How will this impeller kit improve my boat's cooling and performance?

Replacing a worn impeller restores the internal water pump’s ability to draw and circulate cooling water from the lower unit. That prevents overheating, reduces cylinder temperature spikes, and stabilizes idle and midrange operation when the engine is under load.

• Neoprene impeller delivers renewed water flow for proper cooling.
• Included pump housing and cup ensure correct water channeling.
• New seals and wear plate stop leaks and prevent cavitation damage.
• Installation hardware and grommets let you reassemble without missing parts.

Which engine models and part numbers does this kit fit?

This kit is built to replace many original equipment part numbers for Johnson and Evinrude small outboards, covering both 2- and 4-stroke variants produced across several model years. It parallels common aftermarket references so technicians and DIYers can match it to their motor’s service manual listings.

• Fits Johnson/Evinrude 8 HP 4T (1995–2004) and 8/9.9 HP 211cc (1996–2004).
• Compatible with 9.9/15 HP 4T 305cc (1995–200?) and many 2- & 4-stroke 1974-up models.
• Cross-references OEM and aftermarket numbers: OMC 0394711, 18-3327, Mallory 9-48201, GLM 12050, Sierra 18-3327, and related listings.
• Check your motor’s service manual or part plate to confirm exact compatibility before ordering.

What components are included and why each matters?

The kit includes the impeller plus every small part needed to reinstall the pump correctly—this prevents common failures caused by reusing old grommets or seals. Fresh hardware and a wear plate ensure reliable alignment and long service life after the replacement.

• 1 neoprene impeller: the rotating element that pushes cooling water through the motor.
• 1 pump housing and 1 pump cup: restore sealed flow pathways inside the lower unit.
• 1 wear plate and 1 seal: protect mating surfaces and prevent internal leakage.
• 4 installation bolts, 3 grommets, 2 O-rings, 1 pin: complete reassembly parts included.

Who is this for? Boaters, marine technicians, and DIY enthusiasts who maintain Johnson or Evinrude 8–15 HP outboards and need a reliable, full replacement impeller kit. It’s aimed at anyone performing routine lower-unit maintenance or addressing symptoms like overheating, poor water stream from the telltale, or reduced engine performance due to a failing pump. If you service older outboards or keep a maintenance schedule (recommended change every 1–2 years or about every 100 hours), this NorthBoat kit supplies the parts needed for an efficient, professional repair.