20412553 Plastic Plug | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta lightweight plastic blanking plug used in cylinder-block casting and service openings on selected TD6 and TWD6 / TD7 mechanical engines. It protects an unused or manufacturing opening from dirt and moisture.

⚙️ Key Features

• Plastic protective or blanking plug
• Function group identifies the cylinder-block assembly
• Confirmed fitment on older TD610M, TD630ME, TWD630ME, TD730ME and TWD730ME engines
• Very low-mass service plug
• Must match the original opening diameter and position
• Engine type: Volvo Penta 6- and 7-litre mechanical diesel

🔌 Function

Closes or protects an unused cylinder-block opening against dirt, water and foreign material.

⚠️ Common Signs of Failure

• Plug missing from the opening
• Cracked or heat-damaged plastic
• Loose fit in the bore
• Oil or coolant contamination around the opening
• Debris entering the engine casting

🛠️ Service Notes

• Tighten a plastic plug by hand or with light tool pressure only — the thread or the head will strip or crack long before it reaches the sort of figure a metal fastener would take
• Where the plug seals a fluid or holds pressure, fit the new sealing washer or ring that belongs with it and check the seat in the casting is clean and undamaged, rather than curing a weep by overtightening
• Renew rather than reuse any plug that is cracked, crazed, distorted or has a damaged head; plastic embrittles with heat and age
• Keep fuel, oil and strong solvents off plastic plugs, and check any plug is fully home and secure after work nearby

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20412553 → Supersedes 20411870 → Supersedes 3826499 → Supersedes 3826500

OEM / Related Numbers

• 20411870 earlier number superseded by this part
• 3826499 earlier number superseded by this part
• 3826500 earlier number superseded by this part

📦 Condition

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