Thermostat – Fits Suzuki Outboard DF 2.5-20 HP (Replaces 17670-91J00, 17670-91J01, 17670-91J02, Johnson/Evinrude 5033385)
Thermostat – Fits Suzuki Outboard DF 2.5-20 HP (Replaces 17670-91J00, 17670-91J01, 17670-91J02, Johnson/Evinrude 5033385) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Thermostat – Fits Suzuki Outboard DF 2.5-20 HP (Replaces 17670-91J0...
Product Details
This aftermarket Thermostat fits Suzuki Outboard DF 2.5-20 HP engines, including 4-stroke models such as the DF2.5 (2006), DF4, DF5, and DF6 (2002 and newer), as well as DF9.9B, DF15A, and DF20A models (2013 and newer). It is also engineered for compatibility with specific Johnson/Evinrude models that use part number 5033385.
It serves as a direct replacement for Suzuki part numbers 17670-91J00, 17670-91J01, and 17670-91J02, along with Johnson/Evinrude 5033385, ensuring precise fit and function.
- Installs as a direct OEM-equivalent replacement.
- Manufactured to meet or exceed original equipment specifications.
- Regulates engine temperature for optimal performance and fuel efficiency.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Suzuki | 17670-91J00, 17670-91J01, 17670-91J02 |
| Johnson/Evinrude | 5033385 |
Engine & Model Compatibility
Confirm your engine model and year in the tables below.
For Suzuki owners, verify your specific DF model and year range against the provided list.
For Johnson/Evinrude owners, this part is compatible if your engine's original thermostat is part number 5033385.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DF2.5 | 2.5 | 4-Stroke | 2006 | 17670-91J00/91J01/91J02 | |
| Suzuki | DF4 | 4 | 4-Stroke | 2002 and newer | 17670-91J00/91J01/91J02 | |
| Suzuki | DF5 | 5 | 4-Stroke | 2002 and newer | 17670-91J00/91J01/91J02 | |
| Suzuki | DF6 | 6 | 4-Stroke | 2002 and newer | 17670-91J00/91J01/91J02 | |
| Suzuki | DF9.9B | 9.9 | 4-Stroke | 2013 and newer | 17670-91J00/91J01/91J02 | |
| Suzuki | DF15A | 15 | 4-Stroke | 2013 and newer | 17670-91J00/91J01/91J02 | |
| Suzuki | DF20A | 20 | 4-Stroke | 2013 and newer | 17670-91J00/91J01/91J02 | |
| Johnson/Evinrude | 5033385 | Compatible with models using this part number |
Technical Specs
- Product Type
- Outboard Engine Thermostat
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline
- Other Technical Attributes
- Manufactured to OEM specifications
What’s in the Box
- 1 x Thermostat (Replaces 17670-91J00, 17670-91J01, 17670-91J02)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery.
- Locate the thermostat housing on the engine block or cylinder head.
- Place a drain pan underneath to catch any coolant.
- Carefully remove the bolts securing the housing cover.
- Note the orientation of the old thermostat before removing it and its gasket.
- Thoroughly clean the mating surfaces of the housing and its cover.
- Install the new thermostat in the same orientation as the original.
- Fit the new gasket and re-install the housing cover, tightening bolts to the manufacturer's specified torque.
- Reconnect the battery, start the engine, and carefully check for any leaks around the housing as the engine warms up.
Troubleshooting & FAQ
How do I know if this thermostat will fit my specific engine model?
The surest way to confirm fitment is by matching your engine's original part number to the ones listed in our Part Number Matrix. You should also consult the Engine & Model Compatibility table to verify your model, horsepower, and year are listed.
What are the common signs of a failing thermostat?
A faulty thermostat can cause engine overheating at various RPMs, or conversely, an engine that runs too cool and never reaches its proper operating temperature. You might notice inconsistent temperature gauge readings or alarms from your engine's monitoring system.
What is the operating temperature of this thermostat?
This thermostat is manufactured to meet the original factory specifications for the correct temperature rating for all compatible models listed. This ensures your engine operates within the range intended by the manufacturer.
How often should I replace my outboard's thermostat?
Refer to your engine's service manual for specific maintenance intervals. As a general guideline, it is good practice to inspect or replace the thermostat every 200-300 service hours or every 2-3 years, especially if operating in saltwater.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement component, not an OEM part.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or quality control.
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