9998251 Protection plug | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta plug 9998251, listed at 0.12 kg. Volvo's own special tools catalogue names both the tool and the job: it is a protection plug, used when working on the cylinder head. The catalogue lists it for the D11 range from D11-510 and D11A-A through the D11B marine engines, the D13 range from D13B-A MP to D13C7-A MP, the D9 range from D9-425 to the D9A2 engines and the TAD1140 to TAD1170 series.

⚙️ Key Features

• Used when working on the cylinder head, as stated in Volvo's tools catalogue
• Listed for the D9, D11 and D13 ranges and the TAD1140 series
• Designated a protection plug, 0.12 kg
• Product-specific tool, not a universal blanking plug

🔌 Function

Blanks off a port or passage while the cylinder head is worked on, keeping swarf, dirt and coolant out of the openings left exposed.

⚠️ Common Signs of Failure

• Leaking past the plug when the circuit is pressurised
• Thread damaged, worn or cross-threaded
• Sealing face scored or bruised
• Plug seized in place through corrosion

🛠️ Service Notes

• Volvo lists this plug specifically for cylinder head work - fit it before the head comes off rather than after
• Check the sealing face and any seal on the plug before relying on it to hold a test pressure
• Count the plugs in and out of the engine; one left in a port is the failure this tool is meant to prevent

📦 Condition

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