21253761 Coolant Pipe | Genuine Volvo Penta Part

🔧 Product Description

Genuine rigid coolant pipe used in the coolant-pump circuit of Volvo Penta D9 marine and TAD9 industrial engines.

🚤 Compatibility

• Engine Family: D, TAD

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta cooling pipe
• Formed for D9 and TAD9 installations
• Correct pump and engine connection geometry
• Designed for pressurised engine coolant
• Uses dedicated sealing O-rings

🔌 Function

The pipe transfers coolant between the coolant pump and adjoining engine passages or heat-exchanger circuit.

⚠️ Common Signs of Failure

• Damaged O-ring seat
• Engine overheating or falling coolant level

🛠️ 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 Supersession Chain

• 21253761 → Supersedes 3836307

OEM / Related Numbers

• 3836307 earlier number superseded by this part

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D9A2J, D9A2G, D9A2L MH, D9A2D, D9A2B, D9A2F, D9A2K, D9A2H, D9A2M MP, D9A2A, D9A2C, D9A2E
• Volvo Penta D11C1-A MP, D11C3-A MP, D11C2-A MP, D11C4-A MP, D11B3-A MP, D11B4-A MP, D11B2-A MP, D11B1-A MP
• Volvo Penta TAD940GE, TAD940VE
• Volvo Penta TAD941VE, TAD941GE
• Volvo Penta TAD942VE
• Volvo Penta TAD943VE
• Volvo Penta TAD950VE
• Volvo Penta TAD951VE
• Volvo Penta TAD952VE