21762104 Expansion Plug | Genuine Volvo Penta Part

🔧 Product Description

Press-fit 34 mm expansion plug used to close a machined coolant or core opening in the Volvo Penta D8 cylinder head.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD1380-82GE
• Volvo Penta TAD1381-85VE
• Volvo Penta TAD1384-85VE-IWP

• Engine Family: TAD

⚙️ Key Features

• Genuine Volvo Penta expansion plug
• Nominal diameter: 34 mm
• Cylinder-head coolant-jacket application
• Press-fit sealing design
• Install with the specified sealant and depth

🔌 Function

Closes the machined cylinder-head opening and seals the coolant jacket.

⚠️ Common Signs of Failure

• Corrosion or perforation
• Plug displaced from the bore
• Incorrect installation depth
• Damaged cylinder-head bore

🛠️ Service Notes

• Clean the bore out to bare, sound metal and check it for corrosion, pitting or a raised lip — a plug will not seal in a wasted or scored bore, and that bore may need attention first
• Fit the plug square to the bore and drive it evenly with a tool or socket that bears on the correct part of the plug, to the depth the manual specifies; driven in cocked or too deep it will leak
• Seal it with a sealant of the type specified for that joint, not with a silicone or rubbery compound, which is slippery and lets a plug creep out under pressure
• With an expanding rubber type, seat it fully, then tighten the centre nut to expand it against the bore and check it again after the first heat cycle
• Fill, pressure-test or run the system and check the plug for weeping before closing up access, since many of these sit where you cannot see them once the engine is back together

🔄 Supersession & Cross Reference

Other-Brand OEM Numbers

• VOE21762104

OEM Reman Alternatives

• Volvo Penta Reman cylinder head: 3801880

📦 Condition

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