Seal, Cover – Fits Johnson / Evinrude 9.9–15hp (Replaces 0336947)
Seal, Cover – Fits Johnson / Evinrude 9.9–15hp (Replaces 0336947) 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
Seal, Cover – Fits Johnson / Evinrude 9.9–15hp (Replaces 0336947)
Product Details
This Seal, Cover – Fits Johnson / Evinrude 9.9–15hp is an essential O-ring designed for specific Johnson and Evinrude outboard engines, particularly those in the 9.9hp to 15hp range. It functions as a thermostat seal, ensuring a proper fit and preventing leaks.
It serves as a direct aftermarket replacement for OEM part number 0336947 and is cross-referenced with aftermarket number 766474.
- Engineered as a direct-fit thermostat seal.
- Maintains a reliable seal to prevent coolant leaks.
- Designed for marine environments.
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Johnson / Evinrude engines: Ensure the part number matches your service manual's requirements for the specified horsepower range.
| Brand | Model | Rated HP | OEM Part No. |
|---|---|---|---|
| Johnson / Evinrude | 9.9hp | 9.9 | 0336947 |
| Johnson / Evinrude | 15hp | 15 | 0336947 |
Technical Specs
- Product Type
- O-Ring / Seal
- Application
- Thermostat seal
- Product Dimensions
- 9.0" L x 12.5" W x 0.2" H
What’s in the Box
- 1 x Seal, Cover (Replaces 0336947 / 766474)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery.
- Locate the thermostat housing on the engine block.
- Carefully remove the bolts securing the thermostat cover.
- Pry off the cover and remove the old thermostat and seal. Note their orientation.
- Thoroughly clean the mating surfaces of the housing and cover, removing any old gasket material or corrosion.
- Place the new seal into the groove on the thermostat or housing as required.
- Re-insert the thermostat and place the cover back onto the housing.
- Tighten the cover bolts evenly and to the manufacturer's recommended torque specification.
- Reconnect the battery, start the engine, and carefully check for any coolant leaks around the housing as the engine warms up.
Troubleshooting & FAQ
How do I know if this seal will fit my specific engine model?
This seal is designed for Johnson and Evinrude 9.9hp and 15hp outboard models. The most reliable way to confirm fitment is to verify that your service manual specifies OEM part number 0336947 for the thermostat seal.
What are the signs of a failing thermostat seal?
A failing seal will typically cause coolant leaks around the thermostat housing. This can lead to engine overheating, erratic temperature gauge readings, or visible coolant residue on the engine.
Can I reuse my old seal after replacing the thermostat?
It is strongly recommended to use a new seal whenever the thermostat housing is opened. Old seals can become compressed, brittle, or damaged during removal, and reusing them creates a high risk of leaks.
Is this a genuine OEM part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, where it is batch-inspected for consistency.
What are your shipping speed & costs?
We ship worldwide quickly—typical transit is 5–15 days for most locations. Standard shipping is free, and expedited options may appear at checkout where available.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not order.
- This is an aftermarket replacement component, not an OEM part. Brand names and part numbers are used for reference purposes only.
- Professional installation is recommended for safety and to ensure optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with an average transit time of 5–15 days.
- Manufacturer-Direct Value — By partnering directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
Payment & Security
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