20405972 Coolant Pipe | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta coolant pipe used in the radiator and charge-air cooler plumbing on TAD532GE, TAD730GE and TAD731GE engines. It forms the upstream or return connection paired with coolant pipe 20405956.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD720GE
• Volvo Penta TAD730GE MECH
• Volvo Penta TAD730GE EDC4
• Volvo Penta TAD731GE MECH
• Volvo Penta TAD731GE EDC4
• Volvo Penta TAD532GE EDC4

• Engine Family: TAD

⚙️ Key Features

• Factory-formed coolant pipe for the cooling package
• Paired with coolant pipe 20405956
• Used with pipe 20412342 and gasket 20412341
• Supported by the specified cable ties and hose clamps
• Routing is specific to the radiator and charge-air cooler package
• Engine type: Volvo Penta 5- and 7-litre turbocharged industrial diesel

🔌 Function

Routes coolant between the engine, radiator and charge-air cooler circuit.

⚠️ Common Signs of Failure

• External coolant leakage
• Pipe chafing or vibration fatigue
• Engine or charge-air temperature increasing
• Loose hose or support connection

🛠️ Service Notes

• Clean both flanges or spigots and check the sealing lands for pitting and corrosion; renew every O-ring, seal or gasket at the joint rather than reusing one that has taken a set
• Lubricate coolant-side O-rings with coolant or a rubber-safe lubricant — petroleum oil and grease swell and soften the rubber and end up in the coolant
• Offer the pipe up and align both ends before pulling any fastener tight, so the joints are not held together by strain from a misaligned pipe or an over-stretched hose
• Check the bore is clear of scale, sealant and debris before fitting, and inspect the pipe for internal corrosion or thinning if the old one was leaking
• Refill with the coolant type and mix specified for your engine, bleed the system through, then check the joints again with the engine hot and up to pressure

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 20405956 - companion coolant pipe
• 20405971 - related transfer tube
• 20412342 - adjoining pipe
• 20412341 - flange gasket
• 20412309 - dedicated pressure-pipe cable tie where specified

📦 Condition

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