Sierra Thermostat 18-3554, 143 Degree F, OMC Stern Drive Replacement, OE 383307

The Sierra 18-3554 Thermostat is a replacement engine thermostat designed for use in OMC stern drive applications. It regulates coolant flow to keep the engine operating within its designed temperature range, opening at a rated temperature of 143 degrees F to protect against overheating while allowing the engine to reach efficient operating temperature quickly. The thermostat is built from alloy steel with a glossy white finish and is sized to fit directly in place of the original equipment thermostat it replaces.

Sierra manufactures this thermostat to meet or exceed the specifications of the original equipment part it replaces, making it a straightforward drop-in replacement for boat owners performing routine cooling system maintenance or troubleshooting an overheating engine. It is part of a broader Sierra thermostat kit lineup that also includes matching manifold and thermostat gaskets, sold separately under their own part numbers.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3554
• Product Dimensions: 2.6 inches D x 2.6 inches W x 0.6 inches H
• Weight: 0.1 pounds
• Temperature Rating: 143 degrees F
• Color: White
• Material: Alloy Steel
• Finish: Glossy
• Country of Origin: China
• UPC: 030999316028
• Category: OMC Thermostats & Gaskets

Fitment

Designed for use in OMC stern drive applications.

Replaces (OEM)

• 383307

Frequently Asked Questions

What temperature does the Sierra 18-3554 thermostat open at? The Sierra 18-3554 thermostat is rated to open at 143 degrees F, regulating coolant flow to keep the engine within its designed operating temperature range.

What applications is the 18-3554 thermostat designed for? This Sierra thermostat is designed for use in OMC stern drive applications.

Is the Sierra 18-3554 an OEM equivalent part? Yes, the 18-3554 replaces original equipment part number 383307, and Sierra builds each thermostat to meet or exceed the specifications of the original equipment part it replaces.

What color is the 18-3554 thermostat? The 18-3554 thermostat has a white glossy finish.

What material is the Sierra 18-3554 thermostat made from? It is made from alloy steel with a glossy finish.

How much does the 18-3554 thermostat weigh? The Sierra 18-3554 thermostat weighs 0.1 pounds.

What are the dimensions of the 18-3554 thermostat? The Sierra 18-3554 measures 2.6 inches D x 2.6 inches W x 0.6 inches H.

Does the 18-3554 come with the gaskets needed for installation? The 18-3554 is the thermostat itself; matching manifold and thermostat gaskets for this kit are sold as separate Sierra part numbers, so buyers replacing the full thermostat kit should order the gaskets alongside 18-3554.

Where is the Sierra 18-3554 thermostat manufactured? The country of origin for the 18-3554 thermostat is China.

What is the UPC for the Sierra 18-3554 thermostat? The UPC for the Sierra 18-3554 thermostat is 030999316028.