Yamaha - Water Tube - Cooling System Component - 6A1-44361-00-00

Overview

This is one of those parts you don’t think about until the engine starts running hot. The water tube carries cooling water from the lower unit up into the powerhead, and when it’s sealed and aligned right, everything stays at the proper temperature. But if it’s bent, corroded, or not seating properly, you’ll start seeing weak water flow or overheating issues. It’s a simple piece, but it’s critical to keeping your motor alive and running strong.

Key Features

• Direct Cooling Water Transfer – Routes water from the lower unit to the engine for proper cooling.
• Precision Alignment Design – Ensures correct fit between pump and powerhead connections.
• Corrosion-Resistant Build – Designed to handle constant exposure to water and marine conditions.
• OEM Fitment Accuracy – Matches Yamaha specifications for proper sealing and installation.

Engine & Boat Compatibility

Designed for Yamaha outboard engines using this style of internal water tube. Commonly used across smaller Yamaha applications where consistent cooling flow is essential for engine protection.

FAQ

Q: What are signs the water tube is damaged?
A: Weak tell-tale stream, overheating, or inconsistent cooling performance are common signs.

Q: Can a bent tube affect engine cooling?
A: Yes, it can restrict water flow and lead to overheating.

Q: Should I check this during water pump service?
A: Absolutely—it’s a good time to inspect alignment and condition.

Q: Does saltwater affect this part?
A: Over time, yes. Corrosion can build up if it’s not flushed and maintained.

Q: Is installation difficult?
A: It requires careful alignment during lower unit installation but is manageable with attention to detail.

• Supersessions
  646-44361-00-00