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Water Pump Impellers (Tohatsu)

Water Pump Impeller 3C8-65021-2

Brand: Tohatsu

SKU: 3C8-65021-2

$27.75
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The Genuine Tohatsu 3C8-65021-2 Water Pump Impeller is designed for selected 40HP and 50HP 2-stroke and TLDI outboard motors. Featuring six flexible rubber blades and a key-drive centre hub, it helps maintain reliable cooling-water circulation throughout the engine. Ideal for scheduled maintenance, water pump repairs and replacing worn or damaged impellers, this genuine OEM component helps maintain efficient cooling performance and reduce overheating risks.

Key benefits

Key Benefits

  • - Genuine Tohatsu OEM replacement part.
  • - Six flexible impeller blades for efficient water circulation.
  • - Factory-designed for compatible water pump assemblies.
  • - Helps maintain consistent engine cooling.
  • - Suitable for selected conventional 2-stroke and TLDI outboards.
  • - Ideal for routine water pump servicing.
  • - Helps reduce the risk of overheating caused by impeller wear.
  • - Direct replacement for the corresponding original impeller.

Specifications & Dimensions

  • - Manufacturer: Tohatsu
  • - Part Number: 3C8-65021-2
  • - Product Type: Water Pump Impeller
  • - Outside Diameter: Approximately 50.4 mm (1.984")
  • - Inside / Shaft Diameter: Approximately 17.2 mm (0.677")
  • - Impeller Height: Approximately 20.1–20.2 mm (0.791–0.795")
  • - Number of Blades: 6
  • - Drive Type: Key drive
  • - Material: Flexible rubber impeller with centre hub
  • - Installation Location: Lower-unit water pump

Compatible Tohatsu Outboards

  • 2-Stroke Outboards
  • - M40D – 40HP
  • - M40D2 – 40HP
  • - M50D – 50HP
  • - M50D2 – 50HP
  • TLDI Direct-Injection Outboards
  • - MD40B – 40HP
  • - MD40B2 – 40HP
  • - MD50B – 50HP
  • - MD50B2 – 50HP
  • Important: Compatibility depends on the engine's serial number and water pump configuration. Confirm the original impeller number before ordering.

4-Stroke Outboards

  • - MFS40A – 40HP
  • - MFS50A – 50HP
  • - MFS60A – 60HP

Compatible Mercury & Mariner Outboards

  • - Mercury 40HP – Selected Japanese-built 2-stroke models.
  • - Mercury 50HP – Selected Japanese-built 2-stroke models.
  • - Mariner 40HP – Selected Japanese-built 2-stroke models.
  • - Mariner 50HP – Selected Japanese-built 2-stroke models.
  • Serial Number Requirement: Aftermarket fitment references identify selected 2003–2016 models with serial numbers beginning 0N. Confirm against the original OEM number.

Cross-Reference & Replacement Part Numbers

  • Genuine Tohatsu OEM
  • - 3C8-65021-2 – Current part number.
  • - 3C8-65021-1 – Superseded part number.
  • - 3C8-65021-0 – Earlier superseded part number.
  • Mercury & Mariner OEM
  • - 47-16154-2 – Supplier-listed equivalent for selected models.
  • Aftermarket Cross-References
  • - Sierra 18-8922

Signs the Water Pump Impeller Needs Replacing

  • - Weak or intermittent cooling-water tell-tale stream.
  • - Engine overheating or temperature warnings.
  • - Cracked, worn, hardened or missing rubber blades.
  • - Reduced water pump performance.
  • - Damage caused by dry running.
  • - Excessive wear from sand or debris.
  • - Impeller deterioration due to age.
  • - Replacement required during scheduled maintenance.

Important Fitment Information

  • - Confirm the engine model and serial number before ordering.
  • - Compare the original impeller dimensions and drive arrangement.
  • - This is a genuine Tohatsu OEM impeller, not an aftermarket replacement.
  • - Not every 40HP–60HP outboard uses this impeller.
  • - Inspect the water pump housing, liner, guide plate and gaskets during replacement.
  • - Replace damaged or worn associated components.
  • - Ensure the impeller drive key is correctly fitted.
  • - Never operate the engine without adequate cooling water.

Shipping

Ships Australia-wide