Thermostat (72°C) – Fits Suzuki Outboard DF40-DF70 (Replaces 17670-87J00-000, 17670-87J01)
Thermostat (72°C) – Fits Suzuki Outboard DF40-DF70 (Replaces 17670-87J00-000, 17670-87J01) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Thermostat (72°C) – Fits Suzuki Outboard DF40-DF70 (Replaces 17670-...
Product Details
This Thermostat (72°C) – Fits Suzuki Outboard DF40-DF70 is engineered for Suzuki 4-Stroke Outboard engines from 40 to 70 HP (models DF40, DF50, DF60, DF70) manufactured between 1998 and 2010. It regulates the engine's temperature by opening the cooling circuit at precisely 72°C to ensure optimal performance and prevent overheating.
It is a direct replacement for Suzuki part numbers 17670-87J00-000 and 17670-87J01, and interchanges with Sierra 18-3627 and CEF 5031762.
- Manufactured in ISO 9002 certified facilities for consistent quality.
- Designed for a precise opening temperature of 72°C (161.6°F).
- Note: Gaskets are not included with this thermostat and must be purchased separately.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Suzuki | 17670-87J00-000 |
| Suzuki | 17670-87J01 |
| Sierra | 18-3627 |
| CEF | 5031762 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This thermostat is designed for the following Suzuki 4-stroke outboard models:
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DF40 | 40 | 4-Stroke | 1999–2010 | 17670-87J00-000 | |
| Suzuki | DF50 | 50 | 4-Stroke | 1999–2010 | 17670-87J00-000 | DF50X-K10 variant |
| Suzuki | DF60 | 60 | 4-Stroke | 1998–2009 | 17670-87J00-000 | |
| Suzuki | DF70 | 70 | 4-Stroke | 1998–2009 | 17670-87J00-000 | DF70W-K9 variant |
Technical Specs
- Product Type
- Thermostat
- Opening Temperature
- 72°C (161.6°F)
- Housing Material
- Metal
- Housing Color
- Silver/Metallic
- Dimensions
- 3 × 3 × 3 in (76.2 × 76.2 × 76.2 mm)
- Weight
- 0.25 lbs (0.11 kg)
- Function
- Regulates engine temperature by opening cooling circuit at specified temperature
- Production Standards
- ISO9002 certified factories
What’s in the Box
- 1 × Thermostat (Replaces 17670-87J00-000/17670-87J01)
Installation Notes
- Ensure the engine is completely cool before starting work. Disconnect the negative battery cable for safety.
- Locate the thermostat housing on the engine. Refer to your service manual if needed.
- Place a drain pan under the housing and slowly loosen the cover bolts to drain any residual coolant.
- Remove the old thermostat and discard it. Carefully clean any old gasket material from the housing and cover surfaces.
- Insert the new thermostat, making sure it is correctly oriented according to your engine's service manual.
- Install a new gasket (not included) on the clean surface of the housing.
- Reinstall the housing cover and tighten the bolts to the manufacturer's specified torque in a crisscross pattern.
- Refill the cooling system with the manufacturer-recommended coolant, then reconnect the battery cable.
- Start the engine, let it idle, and carefully check for any leaks around the thermostat housing as it warms up.
Troubleshooting & FAQ
How do I know if my thermostat is failing?
Common signs of a faulty thermostat include the engine overheating or running too cold, erratic temperature gauge readings, poor engine performance, increased fuel consumption, or visible coolant leaks near the thermostat housing.
Does this thermostat come with a gasket?
No, a gasket is not included in this package. You must purchase the correct gasket for your specific engine model separately to ensure a proper seal during installation.
What is the correct opening temperature for my Suzuki outboard?
This particular thermostat is designed to open at 72°C (161.6°F), which is the standard specification for the listed Suzuki DF40–DF70 models. Using the correct temperature thermostat is critical for engine longevity and performance.
Is this part identical to the original Suzuki part?
This is a high-quality aftermarket part engineered to meet or exceed original equipment manufacturer (OEM) specifications. While it provides the same fit and function, there may be minor cosmetic differences. It offers a reliable and cost-effective alternative to OEM components.
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/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- 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 QC.
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