Yamaha - Water Tube - Cooling System Component - 6K5-44361-10-00

Overview

The Yamaha Water Tube | 6K5-44361-10-00 is one of those parts you don’t see working, but you’ll definitely notice when it isn’t. It carries cooling water up from the lower unit to the powerhead, keeping engine temps where they should be. When these tubes corrode, clog, or get misaligned, overheating isn’t far behind. It’s a simple piece, but it plays a big role in keeping your motor alive on long runs.

Key Features

• Direct Cooling Water Delivery – Moves water efficiently from the lower unit to the engine.

• OEM Fit and Routing – Designed to align correctly within Yamaha cooling passages.

• Corrosion-Resistant Build – Holds up against constant water exposure and marine conditions.

• Maintains Engine Temperature – Supports consistent cooling to prevent overheating.

Compatibility

Compatible with select Yamaha outboard engines using this water tube configuration.
Commonly found in mid-range Yamaha outboards with standard cooling systems.
Always confirm compatibility using your engine model and part number.

FAQs

Q: What happens if this water tube fails?
A: You’ll usually see overheating issues or reduced water flow from the telltale.

Q: Can this tube get clogged?
A: Yes, debris or buildup can restrict flow over time, especially in shallow or dirty water.

Q: Is this something that wears out often?
A: Not frequently, but corrosion or improper installation can shorten its life.

Q: Do I need to remove the lower unit to replace it?
A: In most cases, yes—it’s part of the internal cooling path between sections.

Q: How can I prevent issues with the water tube?
A: Regular flushing after use and checking water flow helps catch problems early.