20412733 Cap Plug | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta cap plug used to close machined coolant or manufacturing galleries in D5 / D7 cylinder heads. The documented installation uses three plugs.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

• Press-fit or retained cylinder-head gallery plug
• Confirmed in D5 / D7 cylinder-head assemblies
• Closes a machining or coolant passage
• Requires a clean, undamaged bore
• Replace if corroded, loose or disturbed
• Engine type: Volvo Penta 5- and 7-litre industrial diesel
• 3 used per assembly

🔌 Function

Closes a cylinder-head gallery or manufacturing opening to retain coolant and protect the casting.

⚠️ Common Signs of Failure

• Coolant seepage from the plug
• Corrosion or looseness
• Plug pushed out by incorrect installation
• Damaged cylinder-head bore
• Unexplained coolant loss

🛠️ 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 / Related Numbers

• 20405500 - related four-cylinder head
• 20405999 - related six-cylinder head

OEM Reman Alternatives

• 3803988 - exchange cylinder heads
• 3803527 - exchange cylinder heads

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D7A-B TA, D7A-T, D7A-TA, D7C-B TA, D7C-TA
• Volvo Penta D5A-B TA, D5A-T, D5A-TA
• Volvo Penta MD2010, MD2010B
• Volvo Penta TAD520GE, TAD520VE
• Volvo Penta TAD530GE MECH, TAD530GE EDC4
• Volvo Penta TAD531GE MECH, TAD531GE EDC4
• Volvo Penta TAD720GE, TAD720VE
• Volvo Penta TAD721GE, TAD721VE
• Volvo Penta TAD722GE, TAD722VE
• Volvo Penta TAD730GE MECH, TAD730GE EDC4
• Volvo Penta TAD731GE MECH, TAD731GE EDC4
• Volvo Penta TAD750GE, TAD750VE
• Volvo Penta TD520GE, TD520VE
• Volvo Penta TD720GE, TD720VE PP
• Volvo Penta TAD420VE
• Volvo Penta TAD532GE EDC4
• Volvo Penta TAD550GE
• Volvo Penta TAD551GE
• Volvo Penta TAD560VE
• Volvo Penta TAD561VE
• Volvo Penta TAD620VE
• Volvo Penta TAD650VE
• Volvo Penta TAD660VE
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TAD751GE
• Volvo Penta TAD760VE
• Volvo Penta TD420VE