• 20405721 Cap Plug | Genuine Volvo Penta Part
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20405721 Cap Plug | Genuine Volvo Penta Part

20405721 Cap Plug | Genuine Volvo Penta Part

$14.78 AUD
$14.78 AUD
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Shipping calculated at checkout.

In stock — Australian warehouse

Typically reaches our store in 3–5 business days

Availability checked daily with Volvo Penta

✓ Authorised Volvo Penta Dealer · Genuine Volvo Penta parts · Ships Australia-wide

🔧 Product Description

Genuine Volvo Penta A45 press-fit cap plug used to close cylinder-block core openings. Six are used on four-cylinder blocks and ten on six-cylinder blocks.

🚤 Compatibility

  • Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

  • A45 press-fit cylinder-block core plug
  • Six used on D5 four-cylinder blocks and ten on D7 six-cylinder blocks
  • Closes casting-core openings in the coolant jacket or block
  • Requires correct bore preparation and installation depth
  • Should be replaced if removed or corroded
  • Engine type: Volvo Penta 5- and 7-litre industrial diesel

🔌 Function

Closes the cylinder-block casting-core openings and retains coolant or internal gallery integrity.

⚠️ Common Signs of Failure

  • Coolant leakage from a core plug
  • Plug corrosion or perforation
  • Plug displaced by freezing or pressure
  • Damaged block bore
  • Slow 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 Supersession Chain

  • 20405721 → Supersedes 20405720 → Supersedes 11700286

OEM / Related Numbers

  • 20405720 earlier number superseded by this part
  • 11700286 earlier number superseded by this part
  • 20405719 - M22 block plug
  • 20405717 - M30 plug
  • 11700284 - related block bushings
  • 11700285 - related block bushings

📦 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 TAD734GE
  • Volvo Penta TAD751GE
  • Volvo Penta TAD752GE
  • Volvo Penta TAD753GE
  • Volvo Penta TAD754GE
  • Volvo Penta TAD760VE
  • Volvo Penta TAD761VE
  • Volvo Penta TAD762VE
  • Volvo Penta TAD763VE
  • Volvo Penta TAD764VE
  • Volvo Penta TAD765VE
  • Volvo Penta TD420VE

Shipping & Delivery

Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.

Returns & Warranty

14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.

Not sure this fits?

Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.

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