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Thermostats (Tohatsu)

Thermostat 3C7-01030-0

Brand: Tohatsu

SKU: 3C7-01030-0

$92.45
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The Genuine Tohatsu 3C7-01030-0 Thermostat is designed for selected 60HP to 140HP 2-stroke and TLDI outboard motors. This genuine OEM component regulates cooling-water circulation to help maintain the engine's correct operating temperature. Ideal for routine cooling system maintenance and replacing thermostats that are stuck, corroded or malfunctioning, it supports reliable engine warm-up, efficient cooling and protection against overheating during normal operation.

Key benefits

Key Benefits

  • - Genuine Tohatsu OEM replacement thermostat.
  • - Suitable for selected 60HP–140HP 2-stroke and TLDI outboards.
  • - Regulates engine cooling-water circulation.
  • - Helps maintain correct operating temperatures.
  • - Supports consistent engine warm-up.
  • - Helps prevent overheating caused by a malfunctioning thermostat.
  • - Factory-specified replacement for compatible engines.
  • - Replaces earlier OEM thermostat reference 3T9-01030-0.
  • - Suitable for routine servicing and cooling-system repairs.

Specifications & Dimensions

  • - Manufacturer: Tohatsu
  • - OEM Part Number: 3C7-01030-0
  • - OEM Ordering Number: 3C7010300M
  • - OEM Description: Thermostat
  • - Product Type: Cooling system thermostat
  • - Opening Temperature: 60°C (140°F)
  • - Engine Type: 2-stroke and TLDI direct injection
  • - Compatible Horsepower: Selected 60HP–140HP
  • - Installation Location: Engine thermostat housing
  • - Construction: Temperature-sensitive valve with metal housing and spring
  • - Material: Metal assembly
  • - Typical Quantity Required: 1 per applicable engine

Compatible Tohatsu Outboards

  • Conventional 2-Stroke – 60HP to 90HP
  • - M60B – 60HP
  • - M60C – 60HP
  • - M70B – 70HP
  • - M70C – 70HP
  • - M70CX – 70HP
  • - M90A2 – 90HP
  • Conventional 2-Stroke – 115HP to 140HP
  • - M115A2 – 115HP
  • - M120A – 120HP
  • - M120A2 – 120HP
  • - M140A – 140HP
  • - M140A2 – 140HP
  • TLDI Direct-Injection – 70HP to 115HP
  • - MD70B – 70HP
  • - MD75C2 – 75HP
  • - MD90B – 90HP
  • - MD90C2 – 90HP
  • - MD115A – 115HP
  • - MD115A2 – 115HP

The factory MD40B/MD50B/MD70B/MD90B parts catalogue specifies

  • - MD70B: 3C7-01030-0 from serial number 70242 onwards.
  • - MD90B: 3C7-01030-0 from serial number 00766 onwards.
  • - Earlier engines in these series may use 3T9-01030-0 as originally fitted.
  • The earlier thermostat is now listed as superseded by 3C7-01030-0, but the thermostat housing and original configuration should still be checked.

Cross-Reference & Replacement Part Numbers

  • Genuine Tohatsu OEM
  • - 3C7-01030-0 – Current genuine thermostat.
  • - 3C7010300M – Current OEM ordering number.
  • - 3T9-01030-0 – Earlier OEM thermostat, superseded.
  • - 3T9010300M – Earlier ordering number, superseded by 3C7010300M.

Signs the Thermostat Needs Replacing

  • - Engine overheating during operation.
  • - Engine temperature warning activates.
  • - Thermostat remains stuck closed.
  • - Thermostat remains stuck open.
  • - Engine takes excessively long to reach operating temperature.
  • - Unstable operating temperature.
  • - Corrosion or mineral deposits affecting thermostat operation.
  • - Damaged or weakened thermostat spring.
  • - Thermostat fails the manufacturer's temperature-opening test.
  • - Thermostat replacement is required during cooling-system servicing.

Important Fitment Information

  • - Confirm the exact outboard model and serial number before ordering.
  • - This is a genuine Tohatsu OEM thermostat, not an aftermarket replacement.
  • - Current part number 3C7-01030-0 replaces 3T9-01030-0.
  • - Suitable for selected conventional 2-stroke and TLDI outboard engines.
  • - Do not assume compatibility based on horsepower alone.
  • - Check the original thermostat part number and housing arrangement.
  • - The published 60°C opening temperature should be confirmed against the engine's service specification.
  • - Inspect the thermostat cap and gasket during replacement.
  • - Replace damaged or deteriorated thermostat gaskets.
  • - Remove corrosion and deposits from the thermostat housing.
  • - Follow the manufacturer's thermostat installation and testing procedures.
  • - Check for cooling-water leaks and correct engine operating temperature after installation.

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