Yamaha - Cartridge Insert - Cooling System Component - 6R3-44322-40-00

Overview

This is one of those parts that quietly keeps your cooling system doing its job. I’ve seen engines run hotter than they should just because an insert like this was worn or partially blocked. When it’s in good shape, water flows where it needs to and the motor stays consistent, even on long runs. It’s not flashy, but it’s critical to keeping things reliable on the water.

Key Features

• Controlled Water Flow Path – Helps direct cooling water efficiently through the system.
• OEM Precision Fit – Matches factory dimensions for proper installation and sealing.
• Corrosion-Resistant Build – Designed to handle constant exposure to marine conditions.
• Supports Stable Engine Temps – Helps maintain consistent cooling performance under load.

Engine & Boat Compatibility

Designed for Yamaha outboard engines with internal water cooling systems. Commonly used across a range of Yamaha outboards where proper water flow and temperature control are essential.

FAQ

Q: What happens if this insert gets clogged?
A: Water flow can be restricted, leading to higher engine temperatures.

Q: How can I tell if it needs replacing?
A: Signs include overheating, reduced water output, or visible buildup and wear.

Q: Does saltwater use affect this part?
A: Yes, salt and debris can build up over time if the system isn’t flushed regularly.

Q: Should I inspect other cooling components at the same time?
A: Definitely, it’s a good idea to check the water pump and passages together.

Q: Any installation tips?
A: Clean the area thoroughly and make sure the insert seats properly with no debris.