Thermostat Kit 143° – Fits Johnson/Evinrude 60-75 HP (Replaces 396987, 382385)
Thermostat Kit 143° – Fits Johnson/Evinrude 60-75 HP (Replaces 396987, 382385) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Thermostat Kit 143° – Fits Johnson/Evinrude 60-75 HP (Replaces 3969...
Thermostat Kit 143° – Fits Johnson/Evinrude 60-75 HP (Replaces 396987, 382385) is backordered and will ship as soon as it is back in stock.
Product Details
This Thermostat Kit 143° – Fits Johnson/Evinrude 60-75 HP is engineered for a range of 2-stroke outboard motors, including 60, 65, 70, and 75 HP models. It is designed to maintain optimal engine temperature for efficient performance in 3-cylinder and 4-cylinder loop-charged carbureted engines.
It serves as a direct cross-reference for Johnson/Evinrude parts 396987, 382385, and 0313416, as well as aftermarket equivalents Sierra 18-3669, Mallory 9-43155, and GLM 13124.
- Ensures a straightforward, direct replacement installation.
- Designed to replace 140°F thermostats in certain legacy models.
- Kit includes thermostat, rubber ring, gasket, and washer for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 396987 |
| Johnson/Evinrude | 382385 |
| Johnson/Evinrude | 0313416 |
| Sierra | 18-3669 |
| Mallory | 9-43155 |
| GLM | 13124 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Johnson/Evinrude models, compatibility is based on horsepower rating. Please verify your OEM part number, as exact model year ranges can vary.
For Mercury/Mariner engines, compatibility is determined by serial number. Check your engine's serial plate to confirm fitment.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Johnson/Evinrude | Various | 60 | 2-Stroke | 396987, 382385 | |
| Johnson/Evinrude | Various | 65 | 2-Stroke | 396987, 382385 | |
| Johnson/Evinrude | Various | 70 | 2-Stroke | 396987, 382385 | |
| Johnson/Evinrude | Various | 75 | 2-Stroke | 396987, 382385 | |
| Mercury | 3-Cylinder Engines | 70 | 2-Stroke | Serial: A996142 and later | |
| Mercury | 3-Cylinder Engines | 75 | 2-Stroke | Serial: C222000 and later | |
| Mercury | 3-Cylinder Engines | 80, 90 | 2-Stroke | Serial: A996142 and later | |
| Mercury | 4-Cylinder Engines | 100 | 2-Stroke | Serial: B209468 and later | |
| Mercury | 4-Cylinder Engines | 115 | 2-Stroke | Serial: C100000 and later | |
| Mercury | 4-Cylinder Engines | 125 | 2-Stroke | Serial: D283222 and later |
Technical Specs
- Product Type
- Thermostat Kit
- Installation
- Direct replacement
- Opening Temperature
- 122°F / 50°C (143° thermostat rating)
- Application
- 3-cylinder (L3) and 4-cylinder (L4) loop-charged carbureted engines
- Other Technical Attributes
- Designed to replace 140°F thermostats in select models
What’s in the Box
- 1 x Thermostat (14586)
- 1 x Rubber Ring (27-62386, 27-62386001, 27-8M0204714)
- 1 x Gasket (27-43006-8)
- 1 x Washer (12-47533)
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Place a drain pan under the engine and drain the cooling system.
- Locate the thermostat housing on the engine block or cylinder head.
- Carefully remove the bolts securing the thermostat housing cover.
- Remove the old thermostat, gasket, and rubber ring. Note their orientation.
- Thoroughly clean the mating surfaces of the housing and cover.
- Install the new thermostat, gasket, and seals in the correct order.
- Re-secure the housing cover and tighten bolts to the manufacturer's specified torque.
- Refill the cooling system with the recommended coolant.
- Start the engine and check for leaks and proper operating temperature.
Troubleshooting & FAQ
How do I know if my thermostat is failing?
Common signs of a faulty thermostat include engine overheating, running too cold (not reaching operating temperature), erratic temperature gauge readings, and increased fuel consumption. A visual inspection may show corrosion or a stuck-open/closed valve.
Is this 143°F thermostat a direct replacement for my original 140°F one?
Yes, this kit is designed to replace both 143°F and 140°F thermostats in the compatible engine models listed. The slightly different rating is common in aftermarket parts and does not negatively affect performance.
What engines does this kit fit?
This kit is designed for a variety of 2-stroke Johnson/Evinrude outboards (60-75 HP) and specific Mercury/Mariner 2-stroke models based on serial number. Please consult the Engine & Model Compatibility table for details.
How often should I replace my outboard's thermostat?
As a preventative maintenance item, it is recommended to inspect your thermostat annually and replace it every 2-3 years, or more frequently if operating in saltwater. Always replace it if you notice signs of failure.
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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