Sierra Thermostat Kit 18-43175 for Tohatsu Outboard Engines, Cross-Reference 9-43175

The Sierra 18-43175 Thermostat Kit is a replacement thermostat kit built for Tohatsu outboard engines, supplying the engine cooling system with a factory-fit thermostat to help maintain proper operating temperature. Marine engines rely on a correctly rated thermostat to regulate coolant flow through the block; a worn, stuck, or failing thermostat can cause overheating or slow engine warm-up, both of which put added strain on internal components. This kit is sized to install as a direct fit for the application it is designed for, making it a straightforward maintenance-interval or troubleshooting replacement for boat owners and marine technicians servicing Tohatsu outboards.

Sierra manufactures this thermostat kit to the exacting dimensional and thermal specifications required for reliable marine engine cooling, and it is packaged as a complete kit for the job rather than a bare component. It is a compact, lightweight part designed to be installed in the outboard's cooling passage where it opens and closes to regulate coolant temperature as the engine runs.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-43175
• Product Type: Thermostat Kit
• Application: Tohatsu Outboard Thermostats and Gaskets
• Weight: 0.07 pounds
• UPC: 808282342012
• Dimensions: 0.39 x 0.39 x 0.39 inches
• OEM Cross Reference: 9-43175

Fitment

• Tohatsu outboard engines (thermostat and gasket application)

Replaces (OEM)

• 9-43175

Frequently Asked Questions

What engines does the Sierra 18-43175 Thermostat Kit fit? The Sierra 18-43175 Thermostat Kit is built for Tohatsu outboard engines as a thermostat and gasket replacement application.

Is 9-43175 the same part as Sierra 18-43175? Yes, 9-43175 is the OEM cross-reference number for the Sierra 18-43175 Thermostat Kit, so either number identifies the same replacement kit.

How much does the thermostat kit weigh? The Sierra 18-43175 Thermostat Kit weighs 0.07 pounds.

What are the dimensions of the Sierra 18-43175? This thermostat kit measures 0.39 x 0.39 x 0.39 inches.

Does this kit include a gasket? Yes, the Sierra 18-43175 is listed as a thermostat kit under the Tohatsu Outboard Thermostats and Gaskets application.

Is this a genuine Sierra part or an aftermarket copy? This is a genuine Sierra-branded thermostat kit, part number 18-43175, manufactured by Sierra for marine engine cooling systems.

Why does a marine thermostat need replacing? A stuck or worn thermostat can cause an outboard to overheat or warm up too slowly, so replacing it with the Sierra 18-43175 kit restores proper coolant regulation.

What is the UPC for the Sierra 18-43175 Thermostat Kit? The UPC for the Sierra 18-43175 Thermostat Kit is 808282342012.

Can I use the OEM number 9-43175 to search for this part? Yes, searching either 9-43175 or 18-43175 will point to the same Sierra thermostat kit.

What is included in the box? The Sierra 18-43175 ships as a complete thermostat kit for the Tohatsu outboard cooling system application.