Thermostat 143° – Fits Johnson/Evinrude, Yamaha Outboard Motors (Replaces 436195)
Thermostat 143° – Fits Johnson/Evinrude, Yamaha Outboard Motors (Replaces 436195) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Thermostat 143° – Fits Johnson/Evinrude, Yamaha Outboard Motors (Re...
Thermostat 143° – Fits Johnson/Evinrude, Yamaha Outboard Motors (Replaces 436195) is backordered and will ship as soon as it is back in stock.
Product Details
This Marine Thermostat 143° is engineered for reliable temperature regulation in a wide range of Johnson/Evinrude 2-Stroke outboard engines from 5 to 300 HP (1993–2007) and select Yamaha 30–40 HP 4-Stroke models. It ensures your engine operates within the optimal temperature range, preventing overheating and improving efficiency.
This component is a direct interchange for OEM and aftermarket parts, including BRP 436195, Sierra 18-3561, Mallory 9-43023, GLM 13150, and Yamaha 6BG-13915-00-00, ensuring broad compatibility and a precise fit.
- Engineered for direct OEM-replacement installation.
- Maintains a consistent 143°F (61.7°C) opening temperature.
- Manufactured in an ISO9002 certified facility for guaranteed quality.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| BRP | 0436195 |
| BRP | 436195 |
| BRP | 0777837 |
| Sierra | 18-79970 |
| Sierra | 18-3561 |
| Mallory | 9-43023 |
| GLM | 13150 |
| Yamaha | 6BG-13915-00-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This thermostat is confirmed to fit the following Johnson/Evinrude outboard motors.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Johnson/Evinrude | Various | 5 | 2-Stroke | 1998–2001 | 436195 |
| Johnson/Evinrude | Various | 6 | 2-Stroke | 1998–2004 | 436195 |
| Johnson/Evinrude | Various | 9.9 | 2-Stroke | 1996–2007 | 436195 |
| Johnson/Evinrude | Various | 15 | 2-Stroke | 1996–2007 | 436195 |
| Johnson/Evinrude | Various | 25 | 2-Stroke | 1996–2001 | 436195 |
| Johnson/Evinrude | Various | 30 | 2-Stroke | 1999–2001 | 436195 |
| Johnson/Evinrude | Various | 45 | 2-Stroke | 1996–2001 | 436195 |
| Johnson/Evinrude | Various | 48 | 2-Stroke | 1995–1996 | 436195 |
| Johnson/Evinrude | Various | 50 | 2-Stroke | 1995–2005 | 436195 |
| Johnson/Evinrude | Various | 60 | 2-Stroke | 1993–2001 | 436195 |
| Johnson/Evinrude | Various | 70 | 2-Stroke | 1993–2001 | 436195 |
| Johnson/Evinrude | Various | 120 | 2-Stroke | 1993–1994 | 436195 |
| Johnson/Evinrude | Various | 130 | 2-Stroke | 1995–2000 | 436195 |
| Johnson/Evinrude | Various | 135 | 2-Stroke | 2001 | 436195 |
| Johnson/Evinrude | Various | 140 | 2-Stroke | 1993–1994 | 436195 |
| Johnson/Evinrude | Various | 250 | 2-Stroke | 1994–1995 | 436195 |
| Johnson/Evinrude | Various | 300 | 2-Stroke | 1994–1995 | 436195 |
This thermostat is also listed as compatible with the following Yamaha outboard engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | Various | 30 | 4-Stroke | 6BG-13915-00-00 | |
| Yamaha | Various | 40 | 4-Stroke | 6BG-13915-00-00 |
Technical Specs
- Product Type
- Marine Engine Thermostat
- Installation
- Direct OEM replacement
- Temperature Rating
- 143°F (61.7°C)
- Operating Temperature
- 143°F (61.7°C) opening temperature
What’s in the Box
- 1 x Thermostat (436195)
Installation Notes
- Disconnect the battery and allow the engine to cool completely.
- Locate the thermostat housing on the engine block and place a drain pan beneath it.
- Remove the bolts securing the housing cover. Carefully pry it open, noting the orientation of the old thermostat.
- Remove the old thermostat and gasket. Clean any old gasket material or corrosion from the housing and cover surfaces.
- Insert the new thermostat in the correct orientation.
- Install a new gasket and re-secure the housing cover, tightening bolts to the manufacturer’s specified torque.
- Reconnect any hoses, refill the cooling system, and reconnect the battery.
- Start the engine and check for leaks around the housing as it warms up.
Troubleshooting & FAQ
How do I confirm this thermostat fits my specific engine model?
The most reliable method is to match the OEM part number (436195) from your engine's service manual with our Part Number Matrix. You can also use our compatibility tables, but always verify against your existing part number or manual, as model year ranges can have variations.
What are the signs of a failing outboard thermostat?
Common symptoms include engine overheating at low speeds, or taking too long to reach operating temperature (running too cool). You might see a temperature alarm on your gauges, notice steam from the engine, or poor engine performance and fuel economy.
What is the correct operating temperature?
This thermostat is designed to begin opening at 143°F (61.7°C) to allow coolant to circulate and maintain the engine in its optimal operating temperature range.
How often should I replace my outboard motor's thermostat?
For preventative maintenance, it's a good practice to inspect and consider replacing your thermostat every 200-300 hours or every 2-3 years, especially if operating in saltwater. A stuck thermostat can cause catastrophic engine damage.
Is a new gasket required for installation?
Yes, a new thermostat housing gasket is always recommended to ensure a proper seal and prevent leaks. This listing is for the thermostat only; gaskets are sold separately.
Is this an OEM part or an aftermarket one?
This is a high-quality aftermarket replacement part, not an OEM component. It is engineered to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function. It is produced in an ISO 9002 certified facility and subject to rigorous quality control.
How fast is shipping and what does it cost?
We ship worldwide, with most orders arriving in 5–15 days via standard delivery. Standard shipping is free for most regions. Expedited shipping options and exact costs are available at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects during normal use. Should you encounter an issue, please contact our support team with your order number. We accept returns on unused items in their original packaging within our standard return period. Please see our full policy page for details.
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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