Outboard Thermostat Kit for Mercury Verado 135 150 200 250 300 400 HP 8M0174561

Outboard Thermostat Kit for Mercury

This outboard thermostat kit, referencing OEM part number 8M0174561, regulates engine temperature for Mercury Verado outboards.

Overview

This outboard thermostat kit for Mercury Verado engines ensures the engine operates at the correct temperature for optimal performance and fuel efficiency. It replaces a faulty or stuck thermostat that can cause overheating or poor warm-up. The kit is designed for 135, 150, 200, 250, 300, and 400 horsepower Verado models.

Built For Performance

• Precision thermostat opens and closes at the correct temperature
• Includes gasket and housing for a complete seal
• Corrosion-resistant materials for saltwater use
• Direct replacement for OEM part number 8M0174561
• Ensures consistent engine temperature under varying loads

Fits These Machines

• for Mercury Verado 135 HP
• for Mercury Verado 150 HP
• for Mercury Verado 200 HP
• for Mercury Verado 250 HP
• for Mercury Verado 300 HP
• for Mercury Verado 400 HP

On-The-Job Use

• Replacing a stuck-closed thermostat that causes overheating
• Replacing a stuck-open thermostat that prevents proper warm-up
• Routine cooling system maintenance on high-performance outboards
• Ensuring consistent engine temperature during long offshore trips

Specs At A Glance

Good To Know

Q: What are the signs of a failing thermostat? A: Symptoms include overheating, poor fuel economy, or slow warm-up. Replacing it with this kit restores proper operation.

Q: Does this thermostat kit work in saltwater? A: Yes, it is made from corrosion-resistant materials designed for marine environments.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.