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Water Pump Impellers (Tohatsu)

Water Pump Impeller 345-65021-0

Brand: Tohatsu

SKU: 345-65021-0

$49.40
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The 345-65021-0 Water Pump Impeller is a six-blade replacement designed for selected Tohatsu, Mercury and Mariner 2-stroke and 4-stroke outboard motors. Manufactured from flexible marine-grade rubber, it provides efficient cooling-water circulation to help maintain correct engine operating temperatures. Suitable for compatible 25HP–40HP outboards, this impeller is ideal for routine maintenance, preventative servicing and water pump repairs to help protect against engine overheating.

Key benefits

Key Benefits

  • - Six flexible blades for efficient cooling-water circulation.
  • - Helps maintain correct engine operating temperature.
  • - Suitable for selected 25HP–40HP outboards.
  • - Compatible with selected 2-stroke and 4-stroke engines.
  • - Replacement for compatible original water pump impellers.
  • - Helps reduce the risk of engine overheating.
  • - Suitable for routine servicing and water pump repairs.

Specifications & Dimensions

  • - Manufacturer Reference: Tohatsu
  • - OEM Part Number: 345-65021-0
  • - OEM Ordering Number: 345650210M
  • - Product Type: Water Pump Impeller
  • - Outside Diameter: 44.10 mm (1.736")
  • - Inside Diameter: 17.12 mm (0.674")
  • - Impeller Height: 20.25 mm (0.797")
  • - Number of Blades: 6
  • - Material: Flexible marine-grade rubber
  • - Application: Outboard engine cooling system

Compatible Tohatsu Outboards

  • 2-Stroke Models
  • - M25C2 / M25C3 – 25HP
  • - M25H / MX25H – 25HP
  • - 25JET – Jet-drive model
  • - M30A3 / M30A4 – 30HP
  • - M30H / MX30H – 30HP
  • - M35 / M35C – 35HP
  • - M40C – 40HP, two-cylinder models

4-Stroke Models

  • - MFS25A – 25HP, selected 2002–2005 models
  • - MFS25B – 25HP, selected 2005–2014 models
  • - MFS25C – 25HP, selected 2015–2017 models
  • - MFS30A – 30HP, selected 2002–2005 models
  • - MFS30B – 30HP, selected 2005–2014 models
  • - MFS30C – 30HP, selected 2015–2017 models

Compatible Mercury & Mariner Outboards

  • 2-Stroke Models
  • - Mercury 25HP SeaPro / Lightning – Selected Japanese-manufactured models with serial numbers beginning 0N.
  • - Mercury 30HP SeaPro / Lightning – Selected Japanese-manufactured models with serial numbers beginning 0N.
  • - Mariner 25HP SeaPro / Lightning – Selected Japanese-manufactured models with serial numbers beginning 0N.
  • - Mariner 30HP SeaPro / Lightning – Selected Japanese-manufactured models with serial numbers beginning 0N.
  • - Mercury / Mariner 25HP EFI – Selected three-cylinder models.
  • - Mercury / Mariner 30HP EFI – Selected three-cylinder models.
  • - Mercury / Mariner 25HP Jet – Selected two-cylinder models.

Cross-Reference & Replacement Part Numbers

  • Tohatsu OEM
  • - 345-65021-0 – Original OEM part number.
  • - 345650210M – OEM ordering number.
  • - 3R0-65021-0 / 3R0650210M – Earlier reference superseded by 345650210M.
  • Mercury / Mariner OEM
  • - 47-16154-1 / 47-161541 – Equivalent impeller reference.
  • - 47-8M0214912 / 8M0214912 – Cross-reference listed in marine parts catalogues.
  • Aftermarket
  • - 18-8923 – Sierra.
  • - 500382 – CEF.
  • - 9-45400 – Mallory.

Signs the Water Pump Impeller Needs Replacing

  • - Weak or No Cooling Water Flow: Reduced or absent water from the tell-tale outlet.
  • - Engine Overheating: Engine runs hotter than normal or activates a temperature warning.
  • - Cracked or Damaged Blades: Impeller vanes show cracking, splitting, tearing or missing sections.
  • - Hardened Rubber: Blades have become brittle or lost their flexibility.
  • - Permanently Bent Vanes: Impeller blades remain deformed after removal.
  • - Reduced Cooling Efficiency: Inadequate water circulation during engine operation.
  • - Dry Running Damage: Impeller has overheated after operating without sufficient cooling water.
  • - Sand or Debris Damage: Abrasive material has damaged the impeller or pump housing.
  • - Scheduled Maintenance: Impeller is due for replacement according to the manufacturer's service schedule.
  • Weak cooling-water flow can also indicate a blocked tell-tale, restricted cooling passages or other cooling-system faults.

Important Fitment Information

  • - Confirm the exact engine model, year and serial number before ordering.
  • - This impeller does not suit every 25HP–40HP outboard.
  • - Compare the original impeller's outside diameter, inside diameter, height and blade count.
  • - Verify the drive key arrangement and water pump housing.
  • - Mercury and Mariner compatibility is particularly dependent on engine origin and serial-number range.
  • - Some 4-stroke variants use different impeller configurations, including hub variations.
  • - Inspect the water pump housing, liner, wear plate and gaskets during replacement.
  • - Do not operate the engine without an adequate cooling-water supply.
  • - This product is an individual impeller, not a complete water pump repair kit.

Shipping

Ships Australia-wide