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Water Pump Impellers (Tohatsu)

Water Pump Impeller 3C7-65021-1

Brand: Tohatsu

SKU: 3C7-65021-1

$49.35
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The 3C7-65021-1 Water Pump Impeller is a replacement cooling-system component designed for selected Tohatsu 2-stroke and TLDI outboard motors. Manufactured from flexible marine-grade rubber, it circulates cooling water through the engine to help maintain correct operating temperatures. Suitable for compatible 70HP–140HP outboards, this impeller is ideal for routine maintenance, preventative servicing and water pump repairs, helping reduce the risk of overheating and cooling-system damage.

Key benefits

Key Benefits

  • - Replacement impeller for selected high-horsepower outboard motors.
  • - Helps maintain reliable engine cooling-water circulation.
  • - Suitable for conventional 2-stroke and TLDI direct-injection engines.
  • - Replaces the earlier 3C7-65021-0 impeller.
  • - Helps reduce the risk of overheating caused by a worn impeller.
  • - Suitable for routine servicing and water pump repairs.
  • - Compatible with selected aftermarket replacement impellers.

Specifications & Dimensions

  • - Manufacturer: Tohatsu
  • - OEM Part Number: 3C7-65021-1
  • - Ordering Number: 3C7650211M
  • - Product Type: Water Pump Impeller
  • - Outside Diameter: Approximately 67.40 mm (2.654")
  • - Inside Diameter: Approximately 20.15 mm (0.793")
  • - Impeller Height: Approximately 35.10 mm (1.382")
  • - Material: Flexible marine-grade rubber
  • - Application: Outboard engine cooling system

Compatible Tohatsu Outboards

  • Conventional 2-Stroke Models
  • - M115A / M115A2 – 115HP
  • - M120A / M120A2 – 120HP
  • - M140A / M140A2 – 140HP

TLDI Direct-Injection 2-Stroke Models

  • - MD70B – 70HP
  • - MD75C2 – 75HP
  • - MD90A / MD90B / MD90C2 – 90HP
  • - MD115A / MD115A2 – 115HP

Cross-Reference & Replacement Part Numbers

  • Tohatsu OEM
  • - 3C7-65021-1 – Genuine OEM impeller.
  • - 3C7650211M – OEM ordering number.
  • - 3C7-65021-0 / 3C7650210M – Superseded earlier version.
  • Aftermarket
  • - 18-8924 – Sierra.
  • - 500388 – CEF.
  • - 9-45402 – Mallory.

Signs the Water Pump Impeller Needs Replacing

  • - Weak or No Cooling Water Flow: Reduced or absent water discharge from the tell-tale outlet.
  • - Engine Overheating: Higher than normal engine temperature or an overheating alarm.
  • - Cracked or Missing Blades: Visible splits, tears or broken impeller vanes.
  • - Hardened Rubber: Impeller has become brittle or lost flexibility.
  • - Permanently Bent Vanes: Blades remain deformed after removal.
  • - Reduced Cooling Efficiency: Inadequate water circulation under load.
  • - Dry Running Damage: Impeller has overheated after operation without sufficient water.
  • - Sand or Debris Damage: Abrasive material has worn the impeller or pump housing.
  • - Scheduled Maintenance: Replacement is due according to the engine service manual.

Important Fitment Information

  • - Confirm the outboard model, serial number and original impeller part number.
  • - This is primarily a high-horsepower 2-stroke and TLDI impeller, not a general 4-stroke replacement.
  • - Six-blade, key-drive construction is documented for equivalent aftermarket impellers.
  • - Do not confuse 3C7-65021-1 with 3C8-65021-2, which is a different impeller family.
  • - Inspect the water pump housing, liner, wear plate and drive key during replacement.
  • - This product is an individual impeller, not a complete water pump kit.

Shipping

Ships Australia-wide