Thermostat – Fits Suzuki Outboard DF 2.5-20 HP (Replaces 17670-91J00, 17670-91J01, 17670-91J02)

Thermostat – Fits Suzuki Outboard DF 2.5-20 HP

This replacement thermostat is designed for a range of Suzuki 4-Stroke outboard engines, including DF2.5 (2006), DF4/DF5/DF6 (2002 and newer), and DF9.9B/DF15A/DF20A (2013 and newer). It also fits select Johnson/Evinrude models that use part number 5033385.

Engineered as a direct replacement for Suzuki part numbers 17670-91J00, 17670-91J01, and 17670-91J02, and Johnson/Evinrude part number 5033385, this thermostat ensures a precise fit and reliable performance.

• Installation Method: Direct replacement for a straightforward installation.
• Fuel Compatibility: Designed for use with gasoline engines.
• Quality Standard: Manufactured to meet or exceed original OEM 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.

Technical Specifications

Package Contents

This kit includes:

• 1 x Thermostat (Replaces Suzuki 17670-91J00 / 17670-91J01 / 17670-91J02)

Installation Guide

1. Disconnect Power: Disconnect the negative battery cable to prevent electrical shorts.
2. Drain Coolant: Place a drain pan under the engine and carefully drain the cooling system.
3. Locate Housing: Identify the thermostat housing on the engine block.
4. Remove Housing: Loosen and remove the bolts securing the thermostat housing cover.
5. Remove Old Thermostat: Take out the old thermostat and its gasket. Note its orientation.
6. Clean Surfaces: Thoroughly clean the gasket mating surfaces on both the housing and the engine block.
7. Install New Thermostat: Insert the new thermostat, ensuring it is in the correct orientation. Place the new gasket in position.
8. Reassemble: Reattach the housing cover and tighten the bolts to the manufacturer's specified torque.
9. Refill Coolant: Refill the cooling system with the appropriate coolant mixture.
10. Check for Leaks: Reconnect the battery, start the engine, and let it warm up. Carefully check for any coolant leaks around the housing.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my Suzuki engine?
A: Check your engine model and year against the compatibility table. This part replaces Suzuki OEM numbers 17670-91J00, 17670-91J01, and 17670-91J02 for DF2.5 (2006), DF4/5/6 (2002+), and DF9.9B/15A/20A (2013+).

Q: Will this work for my Johnson/Evinrude outboard?
A: This thermostat is a direct replacement for Johnson/Evinrude part number 5033385. Please verify this is the correct part number for your specific model, as we do not have a detailed model list for Johnson/Evinrude compatibility.

Q: What are the signs of a failing thermostat?
A: Common signs include the engine overheating, the engine not reaching its proper operating temperature (running too cold), or erratic temperature gauge readings. Failure to replace a faulty thermostat can lead to poor engine performance and potential damage.

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.