21039801 Cap Plug | Genuine Volvo Penta Part

🔧 Product Description

Brand-new genuine Volvo Penta cap plug matched to the specified opening in the engine block port sealing. Its thread, press fit or sealing face closes the port while maintaining the integrity of the surrounding assembly.

🚤 Compatibility

Typically suits:

• Volvo Penta D7A-B TA
• Volvo Penta D7A-T
• Volvo Penta D7A-TA
• Volvo Penta D7C-B TA
• Volvo Penta D7C-TA

• Engine Family: D

⚙️ Key Features

• Genuine Volvo Penta closure component
• Correct factory dimensions and seating geometry
• Prevents leakage and contamination entry
• Designed for the original pressure and temperature environment
• Seal or washer is separate unless listed
• Engine type: Volvo Penta 5-litre inline diesel

🔌 Function

Closes and seals the designated service, casting or fluid port in the original engine assembly.

⚠️ Common Signs of Failure

• Leakage or staining around the closure
• Damaged, corroded or crossed threads
• Loose fit or repeated movement
• Missing, hardened or damaged sealing element
• Cracking, distortion or contamination at the port

🛠️ Service Notes

• Fit a new plug rather than refitting a used one — a plug that has been driven or screwed out will not seal reliably a second time
• Clean the bore or threads out fully and check the sealing seat for corrosion pitting and damage; a pitted seat will keep weeping whatever plug is fitted
• Fit the plug squarely and to the depth or tightness given in the workshop manual for your engine, using only the sealant or thread compound specified for that joint
• Support the surrounding casting where you can and drive or tighten without distorting the plug, then pressure test or run the engine up and check the plug for weeping

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21039801 → Supersedes 20758137 → Supersedes 20702078 → Supersedes 20450779

OEM / Related Numbers

• 20758137 earlier number superseded by this part
• 20702078 earlier number superseded by this part
• 20450779 earlier number superseded by this part

Other-Brand OEM Numbers

• VOE21039801

📦 Condition

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