21581591 Water Pipe | Genuine Volvo Penta Part

🔧 Product Description

A genuine formed water pipe used in the cooling-system and heat-exchanger assembly on Volvo Penta D13B-A marine propulsion engines. It routes cooling water through the specified section of the system while maintaining factory clearances and correct alignment with the heat exchanger and adjoining hoses.

🚤 Compatibility

• Engine Family: D
• HP Range: Approximately 700-900 HP
• Year Range: Approximately 2009 - 2015

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta formed cooling-water pipe
• Factory routing for the D13B-A MP heat-exchanger system
• Designed for pressurised marine cooling service
• Correct connection orientation and bend geometry
• Direct replacement for a corroded, cracked or distorted original pipe
• Engine type: 12.8L inline six-cylinder turbocharged marine diesel

🔌 Function

Carries coolant or raw water between the heat exchanger and adjoining cooling components without restricting flow or imposing side load on the seals and hose connections.

⚠️ Common Signs of Failure

• Water or coolant seepage at the connections
• Pinhole corrosion or cracking
• Overheating caused by fluid loss or internal restriction
• Chafing or fatigue from missing supports
• Hose misalignment caused by a bent pipe

🛠️ Service Notes

• Drain the system to below the level of the pipe before disconnecting it and catch what comes out — coolant and raw water both make a mess of a bilge
• Renew the O-rings, seals or gaskets at each joint rather than reusing them, and lubricate rubber seals with clean coolant or the lubricant the manual specifies, never with oil or grease
• Check the bore is clear and clean before fitting; scale, silt and debris carried over from the old pipe will lodge in the pump or heat exchanger
• Support the pipe on its original brackets and clips so the joints carry no strain, and keep it clear of hot surfaces and moving parts
• Refill, bleed, then run the engine and check every joint for weeping while it is warm and under pressure

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21404010 - heat exchanger
• 3889790 - related heat-exchanger brackets
• 3889774 - related heat-exchanger brackets
• 864491 - gasket
• 3826300 - tube
• 21247896 - related pipe
• 975675 - O-ring
• 21331356 - overflow valves
• 21331358 - overflow valves
• 1676622 - quick coupling

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D13C3-B MH, D13C1-B MH, D13C2-B MP, D13C3-A MP, D13C4-A MP, D13B-L MP, D13B-E MG, D13B-E MG (FE), D13B-E MH, D13B-E MH (FE), D13B-N MH, D13B-N MH (FE), D13B-D MP, D13B-M MP, D13B-C MP, D13C1-A MH, D13C4-B MP, D13C1-B MG, D13C3-B MG, D13C5-A MP, D13C1-A MG, D13C6-A MP, D13C7-B MP, D13C8-B MP