QuickMarine Thermostat & Seals Kit for Johnson Evinrude Outboards 5-235 HP

Overview

The QuickMarine Thermostat & Seals Kit brings a brass-built solution to upkeep and basic maintenance for Johnson and Evinrude outboards. Designed for engines across a broad range of HP classes, this kit combines a brass thermostat with two seals to help you refresh the cooling pathway. The compact, purpose-built components are finished for a snug, dependable seal where it matters most.

With a 60°C (143°F) thermostat temperature specification, this kit is tailored for reliable baseline control and predictable warm-up behavior. While every engine is unique, upgrading to the brass thermostat and fresh seals can contribute to steadier temperature readings and considerate wear on the cooling loop when installed correctly and paired with routine maintenance.

What’s included

• Brass thermostat with two gaskets
• Compatibility references aligned with common OEM numbers
• Brass construction designed for durable sealing and long-term performance

Fitment highlights

• Fits Johnson and Evinrude outboards in the 5–235 HP range
• Cross-references with Sierra 18-3543 and similar models
• 60°C / 143°F thermostat setting for consistent start-up and operation

Real-world use cases

Ride along on calm mornings or choppy afternoons with confidence, knowing your cooling pathway has fresh brass components and seals. This kit is suitable for routine maintenance during seasonal service or as part of a mid-season refresh after a thorough engine check. The tactile brass parts offer a reassuring feel when you handle them during installation, and the included seals help establish a solid seal against the housing.

Installation tips

Prepare the cooling system, remove the old thermostat and seals, and install the new brass thermostat with the two seals. Ensure surfaces are clean, inspect the housing for damage, and reassemble with appropriate torque and gasket seating. If you’re cross-checking OEM references, verify fitment against the listed numbers in your service notes.

Why choose QuickMarine

QuickMarine focuses on durable, compatible cooling components for popular outboards. This kit blends brass reliability with clear fitment references to simplify maintenance planning and help you complete a tidy, reliable replacement when needed.