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Water Pump Impellers (Tohatsu)

Water Pump Impeller 6HP 8HP 9.8HP - 3B2-65021-1

Brand: Tohatsu

SKU: 3B2-65021-1

$39.85
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Keep your outboard running cool and reliable with the Genuine Tohatsu Water Pump Impeller 3B2-65021-1, superseding 3B2-65021-0. Manufactured to OEM specifications, this premium impeller provides maximum water flow, dependable engine cooling and long service life. Replacing your water pump impeller at the recommended service intervals helps prevent overheating and protects your engine from costly damage. Ideal for scheduled maintenance or complete water pump rebuilds.

Key benefits

Specifications

  • OEM Part Number 3B2-65021-1
  • Supersedes - 3B2-65021-0
  • Outside Diameter - 40 mm
  • Inside Diameter - 12.1 mm
  • Height - 18 mm
  • Blades - 6
  • Material - Marine Grade Neoprene Rubber

Compatible Tohatsu Outboards

  • 2-Stroke Models
  • M6B – 6HP
  • M8B – 8HP
  • M9.8B – 9.8HP
  • 4-Stroke Models
  • MFS6A3
  • MFS6BZ
  • MFS6CZ
  • MFS8A
  • MFS8A2
  • MFS8A3
  • MFS8B
  • MFS8C
  • MFS9.8A
  • MFS9.8A2
  • MFS9.8A3
  • MFS9.8B
  • MFS9.8C
  • MFS9.9CX
  • MFS9.9CY

Compatible Mercury & Mariner Outboards (Tohatsu Manufactured)

  • Mercury 6HP 2-Stroke (Japanese-built)
  • Mercury 8HP 2-Stroke
  • Mercury 8HP 4-Stroke
  • Mercury 9.8HP 4-Stroke
  • Mercury 9.9HP 4-Stroke (209cc Japanese-built)
  • Mariner 6HP 2-Stroke
  • Mariner 8HP 2-Stroke
  • Mariner 8HP 4-Stroke
  • Mariner 9.8HP 4-Stroke
  • Mariner 9.9HP 4-Stroke
  • Always verify your engine model and serial number before ordering, as Mercury used multiple manufacturers during these production years.

Replaces Aftermarket Part Numbers

  • Sierra 18-8920
  • Mercury 47-8037481
  • Mercury 47-8M0214945
  • CEF 500344

Signs Your Impeller Needs Replacing

  • Weak or no tell-tale water stream
  • Engine overheating
  • High engine temperature alarm
  • Reduced cooling water flow
  • Impeller over two years old
  • Outboard stored for extended periods
  • Water pump serviced during annual maintenance

Why Replace Your Water Pump Impeller?

  • The impeller is one of the most important service items on any outboard motor. As the rubber blades age they become hard, crack or break apart, reducing cooling water flow. Regular replacement helps prevent overheating, cylinder damage and expensive engine repairs. For maximum reliability, replace the impeller every 2–3 years or 100 hours, whichever comes first, or according to your manufacturer's recommended maintenance schedule.

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