# 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

## Details

- **Price:** 6.0 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 6.00 AUD | In stock |

## Images

- 20412733 Cap Plug | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20412733-cap-plug-genuine-volvo-penta)
> Updated: 2026-09-19