21166232 Plug | Genuine Volvo Penta Part

🔧 Product Description

A threaded closure plug used in the water-jacketed exhaust-manifold and catalytic-converter assembly of the 8.1GiC-400-JF. It closes a service, sensor or manufacturing opening and seals against the specified O-ring or thread interface.

🚤 Compatibility

• HP Range: Approximately 400 HP

Full model list at the end of this description.

⚙️ Key Features

• 8.1GiC catalytic-exhaust housing plug
• Heat- and corrosion-resistant construction
• Correct thread and installed depth
• Used at documented manifold/converter positions
• Requires the specified sealing component
• Engine type: 8.1-litre gasoline marine engine exhaust and catalytic-converter system
• Quantity varies by assembly, most commonly six

🔌 Function

Closes and seals the assigned opening while maintaining exhaust-gas and cooling-water containment.

⚠️ Common Signs of Failure

• Oil, coolant, hydraulic fluid or gas leakage
• Hardened, flattened, cracked or extruded sealing material
• Damaged thread or mating surface
• Recurring leakage after incorrect torque or surface preparation

🛠️ Service Notes

• Clean the threads and the seating face before fitting, and make sure the opening itself is clear of old sealant, swarf and corrosion
• Renew the sealing washer or O-ring where one is fitted rather than reusing a flattened one, and only use thread sealant where the workshop manual for your engine calls for it
• Tighten to the figure given in the workshop manual for your engine — plugs in aluminium and other soft castings strip easily, and a plug pulled up hard to cure a leak usually distorts the seat and makes it worse
• Where the plug closes an oil, fuel or coolant passage, run the engine up to temperature afterwards and check the joint under pressure before signing the job off
• Keep removed plugs paired with the holes they came out of during a strip-down — plugs of very similar appearance often differ in thread, reach or sealing type

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 976970 - O-ring references at nearby exhaust plugs
• 977000 - O-ring references at nearby exhaust plugs
• 3889995 - catalytic converter
• 3848811 - exhaust-manifold references
• 3848809 - exhaust-manifold references

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta 8.1GiC-J, 8.1GiC-JF, 8.1GiCE-JF, 8.1GiCE-J, 8.1GiCE-M, 8.1GiCE-P, 8.1GiC-Q, 8.1GiCE-Q, 8.1IPSCE-JF, 8.1IPSCE-MF, 8.1IPSCE-P, 8.1IPSCE-Q, 5.7GXiC-J, 5.7GXiC-JF, 5.7GXiCE-JF, 5.7GXiCE-J, 5.7GXiCE-M, 5.7GiCE-300-M, 5.7GiCE-300-MF, 5.7GiC-300-J, 5.7GiCE-300-J, 5.7GiCE-300-JF, 5.7GiC-300-JF, 5.0GiC-J, 5.0GXiCE-JF, 5.0GXiCE-J, 5.0GXiC-JF, 5.0GXiCE-M, 5.0GXiCE-MF, 5.0GXiC-J