21397682 Pipe | Genuine Volvo Penta Part

🔧 Product Description

Rigid coolant connection pipe used at the expansion-tank assembly on specified Volvo Penta D11 and D16 marine engines. It provides the formed, correctly aligned passage between the tank and adjoining cooling-system hose or water pipe while preserving the required clearance around the engine installation.

⚙️ Key Features

• Genuine Volvo Penta formed expansion-tank pipe
• Used in specified D11A and D16C marine cooling systems
• Correct bends and connection geometry for the OEM tank arrangement
• Works with the applicable O-ring, hose and pressure-cap components
• Rigid replacement for a corroded, damaged or distorted original pipe
• Engine type: Volvo Penta D11 or D16 inline six-cylinder marine diesel

🔌 Function

Carries coolant between the expansion tank and the engine cooling circuit while maintaining the tank's deaeration and pressure-management path.

⚠️ Common Signs of Failure

• Coolant seepage, staining or corrosion at the pipe ends
• Pinhole corrosion or cracking at formed bends
• Distortion causing poor hose alignment or clamp sealing
• Restricted internal passage from deposits
• Loss of coolant or air entry into the expansion-tank circuit

🛠️ Service Notes

• Offer the pipe up and check it reaches both connections freely before you tighten anything — a rigid pipe pulled into place is a pipe left under permanent strain, and strained pipes crack at the fittings in service
• Renew the sealing washers, O-rings or union seals that go with the pipe rather than reusing the old ones, and make sure the seats, faces and threads are clean
• Keep the ends capped while you work and blow or flush a pipe through before fitting; anything left inside goes straight into the oil, fuel or coolant system
• Tighten unions and banjo bolts evenly to the figures in the workshop manual for your engine — overtightening distorts the seat and starts the leak you were trying to cure
• Refit every clip and support bracket in its original place and keep the pipe clear of hot or moving parts so it cannot chafe or be shaken to failure

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 3885197 → Superseded by 21505289 - associated expansion-tank assembly on specified D11 applications
• 21861378 - associated D16 expansion tank
• 1674083 - associated pressure cap
• 968725 - associated O-ring
• 21867371 - associated water pipe
• 943366 - associated cooling hoses
• 943367 - associated cooling hoses

📦 Condition

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