160°F Marine Engine Thermostat Kit for OMC Cobra and Volvo Penta 4.3L–5.8L V6/V8 Engines

Product Details

This 160°F marine engine thermostat kit is designed for selected OMC Cobra and Volvo Penta gasoline sterndrive applications. The thermostat helps regulate engine coolant temperature and is listed for select 4.3L, 5.0L, 5.7L and 5.8L V6/V8 marine engines. Always confirm the engine model, year, serial range and existing thermostat dimensions before ordering.

The thermostat is listed as a replacement for several commonly cross-referenced numbers, including OMC 379754, 383307 and 3856961, Sierra 18-3653 and 18-3554, GLM 13430 and 13060, and Mallory 9-43156 and 9-43021. These references should be used for identification only; they do not replace application verification.

• 160°F (71°C) thermostat opening temperature.
• Aftermarket replacement for selected marine cooling-system applications.
• Kit includes the thermostat, gasket and O-ring.
• Intended for applications using the small thermostat version listed below.

Part Number Matrix

The following references are associated with this replacement thermostat application. Confirm the correct part against your original component and engine documentation.

Engine & Model Compatibility

The applications below represent the listed OMC and Volvo Penta references for this thermostat style. Model, year, serial-number, thermostat-size and housing requirements can vary, so verify the complete application before installation.

Volvo Penta Applications

This thermostat is listed for selected Volvo Penta V6 and V8 gasoline marine engines using the applicable thermostat housing. Confirm the precise model and serial-number range before purchase.

Technical Specifications

Product Type

Marine engine thermostat kit

Thermostat Rating

160°F (71°C)

Installation

Replacement thermostat for compatible marine cooling systems

Engine Fuel Type

Gasoline

Thermostat Version

Small thermostat version

Housing Material

Brass/metal

Housing Color

Silver/metallic

Weight

2.82 oz (0.08 kg)

What's in the Box

• 1 × 160°F thermostat
• 1 × gasket
• 1 × O-ring

Reference numbers commonly associated with the included thermostat and sealing components include 383307, 3856961, 3852111 and 3852071. Confirm the original component dimensions and sealing arrangement before installation.

Installation Notes

1. Allow the engine to cool completely and disconnect the battery before beginning work.
2. Locate the thermostat housing, typically near the main cooling hose connection.
3. Place a drain pan beneath the housing and loosen the housing fasteners carefully.
4. Remove the old thermostat, gasket and O-ring, noting the thermostat orientation.
5. Clean the mating surfaces thoroughly and remove old gasket material or corrosion.
6. Install the new thermostat in the same orientation as the original, followed by the gasket and O-ring.
7. Tighten the housing fasteners to the engine manufacturer's specified torque. Do not overtighten.
8. Reconnect the hose, refill the cooling system as required, and inspect for leaks before operating the engine.

Troubleshooting & FAQ

Safety & Important Information

• Verify the engine model, year, serial range, thermostat size and reference number before ordering.
• Do not rely on horsepower or model name alone to confirm fitment.
• Compare the replacement parts with the original thermostat, gasket and O-ring before installation.
• Follow the engine manufacturer's service procedures and torque specifications.
• Professional installation is recommended when the cooling-system configuration or application is uncertain.

About Sea Sierra

• Marine Replacement Parts — Replacement components for selected marine engine and sterndrive applications.
• Application-Focused Support — Verify model, year, serial range and original-part details before installation.
• Quality-Conscious Sourcing — Parts selected for practical marine maintenance and replacement needs.