Thermostat Kit – Fits Tohatsu/Nissan 2-50 HP Outboards (Replaces 346-01030, 345-01030)

Thermostat Kit – Fits Tohatsu/Nissan 2-50 HP Outboards (Replaces 346-01030, 345-01030)

This thermostat kit is engineered for a wide range of Tohatsu and Nissan 2-stroke and 4-stroke outboard motors from 2 HP to 50 HP. It ensures your engine maintains the correct operating temperature for optimal performance and longevity.

This component serves as a direct replacement for Tohatsu and Nissan OEM part numbers, including 346-01030-0, 346-01030-1, 345-01030-0, 345-01030-1, 350-01030-1, and 3H6-01030-0.

• Maintains proper engine temperature at 50°C (122°F).
• Engineered as a direct-fit replacement for straightforward installation.
• Kit includes the thermostat, housing gasket, and thermostat seals for a complete service.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Thermostat (346-01030)
• 1 x Thermostat Housing Gasket
• 2 x Thermostat Seals

Installation Guide

1. Ensure the engine is completely cool before starting.
2. Place a container under the engine to catch draining coolant.
3. Locate the thermostat housing on the engine block or cylinder head.
4. Carefully loosen and remove the bolts securing the housing cover.
5. Remove the old thermostat and gasket. Note the thermostat's orientation.
6. Clean the mating surfaces of the housing and cover, removing any old gasket material.
7. Install the new thermostat in the correct orientation, followed by the new gasket and seals.
8. Re-secure the housing cover and tighten the bolts to the manufacturer's specified torque.
9. Refill the cooling system with the recommended coolant.
10. Start the engine and let it warm up, checking carefully for any leaks around the housing.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my engine?

A: This kit is designed for a wide range of Tohatsu and Nissan outboards from 2 to 50 HP. Please review the "Compatible Engine Models" table and cross-reference the OEM part number (346-01030, 345-01030, etc.) with your service manual or existing part to ensure a perfect match.

Q: What are common signs of a failing thermostat?

A: Symptoms of a bad thermostat include engine overheating, running too cold (not reaching operating temperature), erratic temperature gauge readings, and potential coolant leaks from the housing area.

Q: What temperature does this thermostat operate at?

A: This thermostat is designed to open at 50°C (122°F), ensuring the engine operates within its ideal temperature range for efficiency and longevity.

Q: Is this an OEM part?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.