Thermostat Kit – Fits MerCruiser, OMC Cobra & Volvo Penta 2.5L/3.0L 120/140 HP (1982–1988) – 160°F
Thermostat Kit – Fits MerCruiser, OMC Cobra & Volvo Penta 2.5L/3.0L 120/140 HP (1982–1988) – 160°F is backordered and will ship as soon as it is back in stock.
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Thermostat Kit – Fits MerCruiser, OMC Cobra & Volvo Penta 2.5L/...
Thermostat Kit – Fits MerCruiser, OMC Cobra & Volvo Penta 2.5L/3.0L 120/140 HP (1982–1988) – 160°F is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket 160°F (71°C) thermostat kit is designed for selected MerCruiser, OMC Cobra and Volvo Penta stern-drive applications using 2.5L and 3.0L engines rated at 120 or 140 HP. The company fitment information specifies applications from 1982 through 1988.
The kit is intended to replace the existing thermostat and sealing gaskets during cooling-system service. Always compare the old parts, housing arrangement and listed reference numbers before ordering.
- 160°F (71°C) thermostat temperature rating.
- Application coverage for 2.5L and 3.0L engines rated at 120 or 140 HP.
- Includes one thermostat and two specified sealing gaskets for service replacement.
- Aftermarket replacement for the listed marine stern-drive applications.
Part Number Matrix
Use the following manufacturer and aftermarket references to compare your existing part. Number listings identify reference applications; verify the complete engine and year conditions before purchase.
| Brand or Reference | Part Number | Reference Type |
|---|---|---|
| MerCruiser | 802446 | OEM reference |
| OMC Cobra | 0778064, 0982554, 3853799 | OEM references |
| Volvo Penta | 3853799 | OEM reference |
| Thermostat reference | 982554 | Component reference |
| Sierra | 18-3670, 18-3670D | Aftermarket references |
Engine & Model Compatibility
Company fitment information covers the following stern-drive applications. The engine displacement, horsepower, drive family and model year must be considered together.
| Brand | Drive or Application | Engine | Rated HP | Years | Reference Numbers |
|---|---|---|---|---|---|
| MerCruiser | Stern / out drive | 2.5L | 120 HP | 1982–1988 | 802446 |
| MerCruiser | Stern / out drive | 3.0L | 140 HP | 1982–1988 | 802446 |
| OMC Cobra | Stern / out drive | 2.5L | 120 HP | 1982–1988 | 0778064, 0982554, 3853799 |
| OMC Cobra | Stern / out drive | 3.0L | 140 HP | 1982–1988 | 0778064, 0982554, 3853799 |
| Volvo Penta | Stern / out drive | 2.5L | 120 HP | 1982–1988 | 3853799 |
| Volvo Penta | Stern / out drive | 3.0L | 140 HP | 1982–1988 | 3853799 |
Technical Specifications
- Product Type
- Thermostat kit
- Application
- Marine stern-drive cooling systems
- Engine Fitment
- 2.5L and 3.0L engines rated at 120 or 140 HP
- Fitment Years
- 1982–1988
- Temperature Rating
- 160°F (71°C)
- Thermostat Reference
- 982554
What’s in the Box
- 1 × 160°F (71°C) thermostat, reference 982554
- 1 × gasket, reference 314809
- 1 × housing gasket, reference 313416
Installation Notes
- Allow the engine and cooling system to cool completely before beginning work.
- Disconnect the battery and follow the applicable service-manual safety procedures.
- Locate the thermostat housing and remove the fasteners according to the engine manufacturer’s procedure.
- Remove the old thermostat and gaskets, noting the thermostat orientation before removal.
- Clean the housing and mating surfaces carefully. Remove old gasket material without damaging the sealing surfaces.
- Install the new thermostat in the correct orientation with the supplied gaskets, including the housing gasket.
- Reinstall the housing and tighten the fasteners to the manufacturer’s specified torque. Do not overtighten.
- Restore the cooling system as required for your specific stern-drive configuration, then inspect for leaks and confirm normal operating temperature.
Troubleshooting & FAQ
How do I confirm that this thermostat kit fits my engine?
Confirm the stern-drive brand, 2.5L or 3.0L engine displacement, 120 or 140 HP rating and 1982–1988 model-year range. Then compare the existing thermostat and gasket arrangement with the listed reference numbers.
What temperature is this thermostat rated for?
This kit uses a 160°F (71°C) thermostat. The 160°F rating replaces the 143°F rating stated in the previous page content.
What parts are included?
The package includes one thermostat, one gasket identified as 314809 and one housing gasket identified as 313416.
Can I reuse the old gaskets?
Reusing old sealing gaskets is not recommended. Use the new gaskets supplied with the kit to help establish a proper seal during installation.
Is this an OEM component?
No. This listing is for an aftermarket replacement kit. MerCruiser, OMC Cobra and Volvo Penta names and part numbers are used only to identify the intended reference applications.
What are common signs of thermostat or gasket problems?
Possible symptoms include abnormal operating temperature, temperature fluctuations, overheating or coolant and cooling-water leaks around the thermostat housing. Diagnose the complete cooling system before replacing parts.
Safety & Important Information
- Verify the complete engine, drive, displacement, horsepower and year conditions before ordering.
- Compare the original thermostat, gasket shapes and housing arrangement with the supplied parts.
- Do not work on a hot engine or pressurized cooling system.
- Use the manufacturer’s service information for torque values, cooling-system procedures and final testing.
- Professional installation is recommended when the applicable service procedure is unfamiliar.
About Sea Sierra
- Marine Replacement Parts — Practical replacement components for selected marine engine and stern-drive applications.
- Application-Focused Listings — Fitment details and reference numbers are provided to support careful part comparison.
- Service-Ready Kits — This thermostat kit combines the thermostat with the specified sealing gaskets for a coordinated replacement service.
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