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Thermostat (72°C) – Fits Suzuki Outboard DF40-DF70 (Replaces 17670-87J00-000, 17670-87J01)
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Thermostat (72°C) – Fits Suzuki Outboard DF40-DF70 (Replaces 17670-87J00-000, 17670-87J01)
This replacement thermostat is designed for Suzuki 4-stroke outboard engines from 40 to 70 HP (DF40, DF50, DF60, DF70), model years 1998–2010. It regulates the engine's operating temperature by opening the cooling circuit at a precise 72°C.
It serves as a direct replacement for Suzuki part numbers 17670-87J00-000 and 17670-87J01, as well as Sierra 18-3627 and CEF 5031762.
- Regulates engine temperature by opening at a factory-set 72°C (161.6°F).
- Engineered to meet OEM specifications for reliable performance.
- Important: A new gasket is required for installation but is not included with this part.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number | Superseded By |
|---|---|---|
| Suzuki | 17670-87J00-000 | 17670-87J01 |
| Suzuki | 17670-87J01 | |
| Sierra | 18-3627 | |
| CEF | 5031762 |
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.
| 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 Specifications
| Specification | Value |
|---|---|
| Product Type | Thermostat |
| Opening Temperature | 72°C (161.6°F) |
| Housing Material | Metal |
| 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 |
Package Contents
1 × Thermostat (Replaces 17670-87J00-000/17670-87J01)
Note: Gasket and O-rings are not included.
Installation Guide
- Ensure the engine is completely cool before beginning work.
- Locate the thermostat housing, typically on the cylinder head or block.
- Place a drain pan under the housing to catch coolant, then unbolt the cover.
- Carefully remove the old thermostat, noting its correct orientation.
- Thoroughly clean the mating surfaces of the housing and its cover.
- Install the new thermostat, ensuring it is seated in the proper direction.
- Fit a new gasket (sold separately) and reinstall the housing cover, tightening bolts to the specified torque.
- Refill the cooling system with the appropriate coolant and start the engine to check for leaks and proper operation.
Troubleshooting & FAQ
Q: How do I confirm this thermostat fits my Suzuki outboard?
A: Check your engine model and year against the "Compatible Engine Models" table. It is also critical to verify that your existing part number matches one of the cross-referenced numbers, such as 17670-87J00-000 or 17670-87J01.
Q: What are the signs of a failing thermostat?
A: Common signs of failure include the engine overheating or, conversely, taking too long to reach its normal operating temperature. An inconsistent temperature gauge reading during operation can also indicate a faulty thermostat that is stuck open or closed.
Q: Is a gasket included with this part?
A: No, this package contains only the thermostat. You will need to purchase the correct gasket separately before beginning the installation.
Q: What is the opening temperature of this thermostat?
A: This thermostat is designed to open at a precise 72°C (161.6°F) to ensure your engine maintains its correct operating temperature for optimal performance and efficiency.
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.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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