WATER TUBE SEAL 6L2-44367-00 PAF25-04050004

Function and technical context

The water pipe seal is a critical component of the Yamaha marine engine cooling system, responsible for sealing the connection between the cooling water distribution pipe and the engine block. Its mission is to prevent seawater or fresh water from escaping from the cooling circuit under pressure, maintaining the tightness of the system throughout the operation. A failure in this seal causes loss of coolant, generating progressive overheating of the engine that can lead to irreversible damage to cylinders, valves and cylinder head if action is not taken immediately.

When to replace this part?

Typical symptoms of wear of this seal include visible coolant drips around the water pipe, abnormal overheating of the engine (especially during prolonged navigation), and progressive loss of coolant without identifying another source of leak. It is recommended to check its condition during each seasonal maintenance and replace it preventively if traces of corrosion, crystallization of salts or any sign of deterioration are observed on its surface. Changing this seal preventively is a maintenance investment that avoids emergency shutdowns at sea and costly engine repairs.

Equivalent manufacturer part numbers