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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.

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

Suitable Applications

  • - Engine thermostat replacement.
  • - Four-stroke cooling system servicing.
  • - Repairs to overheating or overcooling caused by thermostat failure.
  • - Replacement of corroded or sticking thermostats.
  • - Restoration of the original cooling system configuration.
  • - Preventative maintenance when inspection identifies deterioration.

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.

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