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Thermostats (Tohatsu)

Thermostat 3VS-01030-0

Brand: Tohatsu

SKU: 3VS-01030-0

$100.80
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The Genuine Tohatsu 3VS-01030-0 Thermostat is designed for selected 25HP and 30HP 4-stroke outboard motors. Featuring a 60°C temperature rating, it regulates cooling-water flow to help maintain the engine's correct operating temperature. Ideal for routine servicing and replacing stuck, corroded or faulty thermostats, this genuine OEM component helps prevent overheating, excessive cold running and inconsistent engine temperatures, supporting reliable operation and efficient engine performance.

Key benefits

Key Benefits

  • - Genuine Tohatsu OEM replacement thermostat.
  • - Factory-specified 60°C (140°F) temperature rating.
  • - Regulates cooling-water circulation according to engine temperature.
  • - Helps prevent engine overheating caused by a faulty thermostat.
  • - Supports consistent operating temperatures.
  • - Suitable for selected 25HP and 30HP 4-stroke EFI outboards.
  • - Helps maintain reliable engine performance.
  • - Ideal for routine servicing and cooling-system repairs.

Specifications & Dimensions

  • - Manufacturer: Tohatsu
  • - OEM Part Number: 3VS-01030-0
  • - OEM Ordering Number: 3VS010300M
  • - Product Type: Engine Cooling Thermostat
  • - Thermostat Temperature Rating: 60°C (140°F)
  • - Engine Type: 4-stroke EFI
  • - Compatible Horsepower: 25HP and 30HP
  • - Installation Location: Engine cooling-water thermostat housing

Compatible Tohatsu Outboards

  • 4-Stroke EFI Models
  • - MFS25D – 25HP
  • - MFS30D – 30HP

Compatible Mercury & Mariner Outboards

  • Mercury 4-Stroke EFI
  • - Mercury 25HP EFI – 3-cylinder, selected models from serial number 1R154758.
  • - Mercury 30HP EFI – 3-cylinder, selected models from serial number 1R154758.

Cross-Reference & Replacement Part Numbers

  • Genuine Tohatsu OEM
  • - 3VS-01030-0 – Genuine thermostat.
  • - 3VS010300M – OEM ordering number.
  • Mercury OEM
  • - 8M0186873

Signs the Thermostat Needs Replacing

  • - Engine Overheating: Thermostat remains closed or does not open sufficiently.
  • - Excessive Cold Running: Thermostat remains open and prevents normal warm-up.
  • - Inconsistent Engine Temperature: Operating temperature fluctuates abnormally.
  • - Poor Warm-Up Performance: Engine takes longer than expected to reach normal temperature.
  • - Corrosion or Salt Deposits: Internal corrosion restricts thermostat movement.
  • - Sticking Thermostat Valve: Valve does not open or close smoothly.
  • - Damaged Thermostat: Visible distortion, corrosion or deterioration.
  • - Cooling System Servicing: Inspection identifies a faulty or unreliable thermostat.
  • These symptoms can also indicate water pump, cooling passage or temperature sensor faults.

Important Fitment Information

  • - Confirm the engine model and serial number before ordering.
  • - This thermostat is designed for selected MFS25D and MFS30D engines.
  • - It is not a universal replacement for all 25HP and 30HP outboards.
  • - Verify the Mercury serial-number range before ordering for Mercury applications.
  • - Do not substitute thermostats with different temperature ratings without factory approval.
  • - Inspect the thermostat cap and gasket during replacement.
  • - Replace the thermostat cap gasket if damaged or deteriorated.
  • - Check the thermostat housing for salt deposits and corrosion.
  • - Follow the manufacturer's service manual for installation.
  • - Never operate the engine without an adequate cooling-water supply.

Shipping

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