143°F Marine Thermostat for Johnson/Evinrude, Chrysler/Force, MerCruiser and Volvo Penta Applications
143°F Marine Thermostat for Johnson/Evinrude, Chrysler/Force, MerCruiser and Volvo Penta Applications is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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143°F Marine Thermostat for Johnson/Evinrude, Chrysler/Force, MerCr...
143°F Marine Thermostat for Johnson/Evinrude, Chrysler/Force, MerCruiser and Volvo Penta Applications is backordered and will ship as soon as it is back in stock.
Product Details
This 143°F (62°C) marine thermostat is an aftermarket replacement designed for selected Johnson/Evinrude, Chrysler/Force, MerCruiser and Volvo Penta applications. It helps regulate engine operating temperature by opening at the specified 143°F rating.
The company catalog identifies this product as a single thermostat rather than a multi-part kit. Confirm the part number and complete engine or sterndrive application before ordering.
- Product type: Marine thermostat
- Opening temperature: 143°F (62°C)
- Installation: Replacement thermostat; follow the engine manufacturer’s service procedure
- Package type: Single thermostat
Reference Part Numbers
The following manufacturer and aftermarket references are associated with this thermostat application. Part-number matching should be confirmed against the original component and engine service information.
| Brand or application | Reference number |
|---|---|
| OMC Johnson/Evinrude | 396987 |
| OMC Johnson/Evinrude | 382385 |
| OMC Johnson/Evinrude | 778261 |
| Chrysler/Force | F335068 |
| MerCruiser | 47594 |
| Volvo Penta | 21148403 |
| Sierra | 18-3557 |
| GLM | 13080 |
| Mallory | 9-43024 |
Application Compatibility
Company catalog records associate this thermostat with the following application groups. The records do not provide a universal model-year, serial-number or stroke range for every application, so verify the exact engine or sterndrive identification and reference number before purchase.
| Manufacturer or application | Documented application details | Reference number |
|---|---|---|
| Johnson/Evinrude outboard | Selected 55, 60, 65, 70 and 75 HP outboard applications | 396987, 382385, 778261 |
| Chrysler/Force outboard | Selected 70, 90, 105, 120 and 135 HP applications | F335068 |
| MerCruiser stern drive / outdrive | GM 6-cylinder engines with 4.1–4.8 L displacement and 90, 160 or 200 HP applications | 47594 |
| Volvo Penta stern drive / outdrive | 3.0 GXi and 3.0GXiC applications | 21148403 |
Horsepower, engine family and drive type must remain matched to the correct reference number. A similar-looking thermostat or a matching horsepower rating alone does not confirm fitment.
Technical Specifications
- Product type
- Aftermarket marine thermostat
- Opening temperature
- 143°F (62°C)
- Applications
- Selected Johnson/Evinrude, Chrysler/Force, MerCruiser and Volvo Penta outboard or stern-drive applications
- Package configuration
- Single thermostat
What’s in the Box
- 1 × 143°F (62°C) marine thermostat
A gasket or seal is not listed as an included component in the company package record. Check the condition of the existing sealing parts and obtain any required replacement gasket or seal separately unless your application documentation specifies otherwise.
Installation Notes
- Allow the engine to cool completely and follow all applicable safety procedures.
- Disconnect the battery or otherwise isolate the starting system as directed by the service manual.
- Locate the thermostat housing and place a suitable drain pan or absorbent material below the work area.
- Remove the housing cover according to the engine manufacturer’s instructions.
- Note the orientation of the original thermostat before removing it.
- Clean the mating surfaces carefully, removing old gasket material and corrosion without damaging the housing.
- Install the replacement thermostat in the correct orientation and use the proper gasket or seal for the application.
- Reinstall the housing and tighten the fasteners to the manufacturer’s specified torque.
- Restore the cooling system as required, start the engine in accordance with the service manual, and check for leaks and correct temperature control.
For stern-drive and outdrive systems, follow the specific cooling-system procedure for the engine and drive assembly. Do not rely on a generic installation procedure where the manufacturer specifies a different service method.
Troubleshooting & FAQ
What temperature is this thermostat rated for?
This thermostat is rated at 143°F (62°C).
How can I tell whether my thermostat may be failing?
Possible symptoms include overheating, running too cool, failure to reach normal operating temperature, or irregular temperature changes. These symptoms can also be caused by other cooling-system problems, so diagnose the complete system before replacing parts.
Does this product include a gasket or seal?
The company record identifies the product as a single thermostat and does not list a gasket or seal as included. Check your application requirements and purchase any required sealing component separately unless it is supplied with your specific order.
Is this an OEM thermostat?
This is an aftermarket replacement thermostat. The listed manufacturer and aftermarket numbers are reference numbers used to help identify compatible applications; the product is not represented as a genuine OEM-branded component.
How do I confirm fitment?
Compare the original thermostat and its reference number with the application information above. Confirm the manufacturer, engine or drive type, horsepower, displacement where applicable, and service-manual requirements before ordering.
How often should a marine thermostat be replaced?
Inspect the thermostat as part of normal cooling-system maintenance and replace it if it sticks, corrodes, fails to regulate temperature, or does not meet the manufacturer’s service requirements. Follow the maintenance interval specified for your engine.
Safety & Important Information
- Verify the complete application and reference number before purchase.
- Never open a hot cooling system. Allow the engine to cool before service.
- Use the correct gasket or seal and follow the manufacturer’s torque and installation instructions.
- Incorrect thermostat fitment or installation can cause overheating, poor temperature control or engine damage.
- Professional installation is recommended when the correct service procedure is not known.
About Sea Sierra
- Marine-focused selection: We supply replacement components for a range of outboard, stern-drive and inboard marine applications.
- Application support: Use the listed reference numbers and application details to help identify the correct replacement before ordering.
- Practical replacement parts: Our catalog is organized around serviceable marine components intended to restore reliable operation when matched to the correct application.
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