Thermostat Seal – Fits OMC, Evinrude, Johnson (Replaces OMC 323582)
Thermostat Seal – Fits OMC, Evinrude, Johnson (Replaces OMC 323582) 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
Thermostat Seal – Fits OMC, Evinrude, Johnson (Replaces OMC 323582)
Product Details
This high-quality Thermostat Seal – Fits OMC, Evinrude, Johnson (Replaces OMC 323582) is designed for a wide range of OMC, Evinrude, and Johnson outboard engines, ensuring a precise fit for the engine's thermostat housing.
It serves as a direct replacement for OEM part numbers OMC 323582, Evinrude 323582, and Johnson 323582.
- Installs in the engine thermostat housing.
- Made from durable rubber to ensure a reliable seal.
- Specifically designed for thermostat sealing in marine environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 323582 |
| Evinrude | 323582 |
| Johnson | 323582 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| OMC | Various | Various | 2- & 4-Stroke | Various | 323582 | General purpose thermostat seal for many models. |
| Evinrude | Various | Various | 2- & 4-Stroke | Various | 323582 | |
| Johnson | Various | Various | 2- & 4-Stroke | Various | 323582 |
Technical Specs
- Product Type
- Seal
- Installation
- Engine Thermostat Housing
- Housing Material
- Rubber
- Dimensions
- Height: 5.13; Width: 4.0; Length: 0.25;
- Fitting Type
- Gasket/Seal
- Other Technical Attributes
- Designed for thermostat sealing
What’s in the Box
- 1 x Seal, Thermostat (323582)
Installation Notes
- Disconnect the battery before beginning work.
- Allow the engine to cool completely and drain the cooling system to a level below the thermostat housing.
- Locate and carefully remove the bolts securing the thermostat housing cover.
- Remove the old thermostat and seal, taking note of their orientation.
- Thoroughly clean the mating surfaces of the thermostat housing and its cover to remove any old gasket material or corrosion.
- Install the new thermostat in the correct orientation, followed by the new thermostat seal.
- Reattach the housing cover and tighten the bolts to the manufacturer's specified torque in a crisscross pattern.
- Refill the cooling system with the appropriate coolant.
- Reconnect the battery, start the engine, and carefully inspect the housing for any signs of leaks as the engine comes up to temperature.
Troubleshooting & FAQ
How do I know if this seal will fit my specific engine model?
This seal replaces part number 323582. The most reliable way to ensure fitment is to verify the required part number for your engine using an official OMC, Evinrude, or Johnson parts catalog. While it fits a very broad range of models, confirmation is key.
What are the signs of a failing thermostat seal?
Common signs include visible coolant leaks around the thermostat housing, engine overheating, or engine temperatures that fluctuate erratically. A degraded seal can compromise the cooling system's pressure and efficiency.
How often should this seal be replaced?
It is best practice to replace the thermostat seal whenever the thermostat is replaced or when the housing is disassembled for any other service. This prevents potential leaks from a compressed or hardened old seal.
Can I reuse my old seal if it looks okay?
No. Seals are designed for one-time use. They compress and harden with heat and time, and will not provide a reliable seal if re-installed. Always use a new seal to prevent leaks.
Is this seal resistant to saltwater and marine fuel additives?
Yes, this component is manufactured from a high-grade rubber compound specifically formulated to withstand the harsh conditions of marine environments, including exposure to saltwater, heat, and common fuel system chemicals.
What’s the difference between this aftermarket part and an OEM one?
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.
How fast is shipping?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty and return policy?
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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