21581591 Water Pipe | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Heat-Exchanger Water Pipe - Part Number: 21581591

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.

⚙️ 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

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 21581591 (current OEM reference)

OEM / Related Numbers:

• 21404010 - heat exchanger

• 3889790 / 3889774 - related heat-exchanger brackets

• 864491 - gasket

• 3826300 - tube

• 21247896 - related pipe

• 975675 - O-ring

• 21331356 / 21331358 - overflow valves

• 1676622 - quick coupling

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Volvo Penta D13B-A marine propulsion cooling systems

Typically suits:

• Engine models:

• D13B-A MP

• HP Range: Approximately 700HP - 900HP, depending on rating

• Engine Type: 12.8L inline six-cylinder turbocharged marine diesel

• Year Range: Approximately 2009 - 2015

• Fitment Note: Confirm the complete D13B-A product and serial number and identify whether the pipe is in the fresh- or raw-water circuit.

🔌 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

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging