Thermostat for Evinrude / Johnson V4 Crossflow – 143°F (62°C), Replaces 18-3673
Thermostat for Evinrude / Johnson V4 Crossflow – 143°F (62°C), Replaces 18-3673 is backordered and will ship as soon as it is back in stock.
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Thermostat for Evinrude / Johnson V4 Crossflow – 143°F (62°C), Repl...
Thermostat for Evinrude / Johnson V4 Crossflow – 143°F (62°C), Replaces 18-3673 is backordered and will ship as soon as it is back in stock.
Product Details
This replacement thermostat is designed for Evinrude and Johnson outboard engines using the V4 Crossflow cooling-system design. It is rated at 143°F (62°C) and helps the engine maintain its intended operating temperature when the original thermostat is worn, stuck, or no longer regulating coolant flow correctly.
The thermostat is made with copper and is listed as a replacement for reference number 18-3673. Confirm the engine model, cooling-system configuration, and original thermostat dimensions before ordering.
- 143°F (62°C) thermostat rating.
- For Evinrude / Johnson V4 Crossflow outboard applications.
- Copper construction.
- Replacement reference: 18-3673.
Part Number Reference
Use the following reference number when comparing the thermostat with your existing part.
| Reference Type | Part Number |
|---|---|
| Replacement reference | 18-3673 |
Engine Compatibility
This thermostat is listed for Evinrude and Johnson V4 Crossflow outboard applications. V4 Crossflow models can vary by horsepower, year, serial number, and cooling-system configuration, so verify the exact application against your engine identification label and the thermostat removed from the engine before purchase.
| Brand | Engine Configuration | Stroke | Application Check |
|---|---|---|---|
| Evinrude / Johnson | V4 Crossflow | Not specified | Confirm model, year, serial number, and original thermostat before ordering. |
Technical Specifications
- Product Type
- Replacement thermostat
- Brand Application
- Evinrude / Johnson Outboard
- Engine Configuration
- V4 Crossflow
- Material
- Copper
- Thermostat Rating
- 143°F (62°C)
- Replacement Reference
- 18-3673
What's in the Box
- 1 x Replacement thermostat
Hoses, gaskets, springs, valves, grommets, clamps, and other cooling-system components are not identified as included with this product. Check the package received before installation.
Installation Notes
- Allow the engine to cool completely before beginning work.
- Disconnect the battery and follow the safety procedures in the engine service manual.
- Remove the thermostat housing cover and note the orientation of the original thermostat and sealing surfaces.
- Remove the old thermostat and clean the mating surfaces carefully.
- Install the replacement thermostat in the correct orientation using the appropriate service-manual procedure and sealing components for your engine.
- Reinstall the housing cover evenly and tighten fasteners to the manufacturer's specified torque.
- Run the engine in a safe test environment and check for leaks and proper cooling-system operation.
Troubleshooting & FAQ
What does the 143°F rating mean?
The 143°F (62°C) rating identifies the thermostat's specified temperature rating. It is important to match this rating and the physical design to the requirements of your particular engine.
Will this fit every Evinrude or Johnson V4 engine?
No universal fitment is claimed. This product is listed for the V4 Crossflow configuration, but exact fitment may vary by model, year, serial number, and cooling-system arrangement. Verify those details before ordering.
Does this include hoses or a complete cooling-system service kit?
No. This listing is for one replacement thermostat. Hoses and other cooling-system components are not identified as included.
What are common signs of a faulty thermostat?
Possible signs include overheating, running cooler than expected, unstable operating temperature, or abnormal temperature readings. Other cooling-system faults can produce similar symptoms, so inspect the complete cooling system before replacing parts.
Should installation follow a service manual?
Yes. Use the service manual for your exact engine to confirm installation orientation, sealing requirements, fastener torque, and post-installation testing.
Safety & Important Information
- Install only with the engine completely cool and follow the applicable service-manual safety instructions.
- Verify the engine model, year, serial number, thermostat rating, dimensions, and reference number before ordering.
- This listing is for one thermostat; hoses and additional cooling-system components are not included unless separately stated.
- Professional installation is recommended when the correct procedure or application is uncertain.
About Sea Sierra
- Marine replacement parts selected for practical repair and maintenance applications.
- Clear product information to help customers compare replacement references and engine configurations.
- Support focused on helping customers verify application details before ordering.
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