Thermostat Cover – Fits Yamaha Outboard Motors (Replaces 688-12413-00-1S)
Thermostat Cover – Fits Yamaha Outboard Motors (Replaces 688-12413-00-1S) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This aftermarket Thermostat Cover is designed for a precise fit on various Yamaha outboard motors that use the corresponding thermostat housing design. It ensures your engine's cooling system is properly sealed and protected, preventing leaks and maintaining optimal operating temperatures.
This component is a direct replacement for Yamaha OEM part numbers 688-12413-00-1S and 688-12413-00-00.
- Engineered as a direct OEM-equivalent replacement.
- Bolted connection ensures a secure seal on the thermostat housing.
- Includes one thermostat cover.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 688-12413-00-1S |
| Yamaha | 688-12413-00-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Compatibility with Yamaha outboard motors depends on the specific engine model and year. Because this part fits a wide range of models, always verify the part number against your engine's service manual before ordering.
| Brand | Model | Rated HP | OEM Part No. | Notes |
|---|---|---|---|---|
| Yamaha | Various Outboard Models | Various | 688-12413-00-1S | Specific compatibility requires further verification |
Technical Specs
- Product Type
- Thermostat Cover
- Installation
- Direct OEM Replacement
- Connection
- Bolted to Thermostat Housing
- Fitting Type
- Direct Fit
- Product Dimensions
- 8.0" x 3.0" x 7.0"
What’s in the Box
- 1 x Cover, Thermostat (Replaces 688-12413-00-1S)
Installation Notes
- Disconnect the battery and allow the engine to cool completely.
- Locate the thermostat housing and place a drain pan beneath it to catch any coolant.
- Carefully remove the bolts securing the old thermostat cover.
- Remove the old cover and thermostat. Note the thermostat's orientation.
- Thoroughly clean the mating surfaces on the housing, ensuring they are free of old gasket material and debris.
- Place the thermostat back into the housing in the correct orientation.
- Install the new thermostat cover, making sure it is properly seated. A new gasket (not included) is highly recommended.
- Tighten the bolts evenly in a crisscross pattern to the manufacturer's recommended torque specification.
- Refill the cooling system and check for leaks after starting the engine.
Troubleshooting & FAQ
How do I know if my thermostat cover needs replacing?
Inspect your current cover for signs of damage such as cracks, significant corrosion, warping, or persistent coolant leaks from the housing area after tightening. Any of these signs indicate a replacement is needed.
Is a new gasket required for installation?
Yes, it is always highly recommended to use a new thermostat cover gasket during installation to ensure a proper, leak-free seal. Gaskets are typically sold separately.
What are the common signs of a leaking thermostat cover?
Common signs include visible coolant drips or residue around the housing, a noticeable drop in the coolant level, and potential engine overheating alarms or performance issues.
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.
Payment & Security
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