859449 Rail | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta rail linking glow plugs 3 and 4, from the Starting System group, weighing 0.025 kg and listed for 11 applications across the TMD, AD, TAMD and MD series. Three glow plug rails appear in this run and the plug numbers are what separate them: 859451 links plugs 1 and 2 on the same 11 applications, and 859450 links plugs 2 and 3.

🚤 Compatibility

Typically suits:

• Volvo Penta TMD31A
• Volvo Penta TMD41A
• Volvo Penta AD41A
• Volvo Penta TAMD41B
• Volvo Penta TAMD41P-A
• Volvo Penta TAMD31L-A
• Volvo Penta TAMD31M-A
• Volvo Penta TAMD41A
• Volvo Penta TAMD31A
• Volvo Penta TAMD31B
• Volvo Penta MD31A

• Engine Family: TMD, AD, TAMD, MD

⚙️ Key Features

• Links glow plugs 3 and 4
• 0.025 kg
• 11 applications across the TMD, AD, TAMD and MD series
• Order by plug numbers — 859451 links 1 and 2, 859450 links 2 and 3

🔌 Function

Carries the supply between adjacent glow plugs, connecting them into the pre-heat circuit.

⚠️ Common Signs of Failure

• Hard starting from cold with the pre-heat apparently working
• One or more glow plugs not heating when the circuit is tested
• Rail corroded, cracked or broken, often at a terminal end
• Burnt or discoloured terminal where a connection has been running hot
• Insulation on the rail chafed or melted

🛠️ Service Notes

• Isolate the battery before working on the pre-heat circuit
• Check the glow plugs themselves and the terminal nuts for corrosion at the same time, since a poor joint burns the rail out
• Order by the plug numbers the rail spans — the three rails in this range are not interchangeable

📦 Condition

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