21334134 Expansion Plug | Genuine Volvo Penta Part

🔧 Product Description

A press-fit expansion plug used to close a casting or machining aperture in the assigned Volvo Penta engine component.

⚙️ Key Features

• Precision plug diameter
• Press-fit sealing design
• Suitable for the assigned casting location
• OEM corrosion-resistant finish

🔌 Function

The plug closes the casting opening and prevents fluid or contamination movement through the aperture.

⚠️ Common Signs of Failure

• Coolant or oil seepage
• Corrosion or perforation
• Plug pushed outward
• Improper seating

🛠️ 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

OEM Supersession Chain

• 21334134 → Supersedes 3580476

OEM / Related Numbers

• 3580476 earlier number superseded by this part

📦 Condition

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