Thermostat (60°C/140°F) – Fits Suzuki Marine Outboard Engines 9.9-70HP (Replaces 17670-94402, 17670-94400, 17670-94404)

Thermostat (60°C/140°F) – Fits Suzuki Marine Outboard Engines 9.9-70HP

This thermostat is designed for Suzuki outboard engines, covering 4-stroke models from 9.9 HP to 70 HP (1999–2009) and select 40 HP 2-stroke models (1984–1998). As a crucial component for temperature regulation, it ensures your engine operates within its optimal temperature range for performance and longevity.

It serves as a direct replacement for multiple Suzuki and Sierra part numbers, rated to begin opening at 60°C (140°F).

• Regulates engine operating temperature for optimal performance.
• Direct-fit installation requires no modifications.
• Built to meet or exceed original equipment specifications.

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. For Suzuki owners, You can review exploded diagrams here to verify part numbers: Suzuki Parts Diagrams & Catalog.

Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

Suzuki Models

Johnson/Evinrude Models

Technical Specifications

Package Contents

• 1 x Thermostat (Replaces Suzuki 17670-94402, 17670-94403, 17670-94404)

Installation Guide

1. Ensure the engine is completely cool before starting.
2. Drain the engine coolant into a suitable container.
3. Locate and unbolt the thermostat housing cover.
4. Carefully remove the old thermostat and gasket, noting their orientation.
5. Clean the mating surfaces of the housing and cover to remove old gasket material.
6. Install the new thermostat, ensuring it is seated correctly.
7. Place the new gasket and re-install the housing cover, tightening bolts to the manufacturer's torque specification.
8. Refill the cooling system with the appropriate coolant.
9. Start the engine and carefully inspect for any leaks around the housing.

Troubleshooting & FAQ

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

A: This part fits a range of Suzuki 4-stroke models (9.9-70 HP, 1999-2009) and some 40 HP 2-stroke models (1984-1998). To ensure a perfect match, please consult the "Compatible Engine Models" table and verify your engine model, year, and original part number (e.g., 17670-94402).

Q: What are the signs of a failing thermostat?

A: Common symptoms include the engine overheating, failing to reach normal operating temperature, or erratic readings on the temperature gauge. A faulty thermostat can lead to poor performance and engine damage.

Q: What is the operating temperature of this thermostat?

A: This thermostat is rated to begin opening at 60°C (140°F). This allows coolant to circulate through the engine block once it has reached its minimum operating temperature.

Q: OEM vs. Aftermarket?

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.