# 3886430 Expansion Plug | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta expansion plug from the Engine group, weighing 0.005 kg and listed for 12 applications across the D and MD series. It supersedes part numbers 21281436 and 861857, one of which was catalogued earlier simply as a plug, so an older parts list may show it under that plainer name.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D1-13
-   Volvo Penta D1-13B
-   Volvo Penta D1-13F
-   Volvo Penta D1-20
-   Volvo Penta D1-20B
-   Volvo Penta D1-20F
-   Volvo Penta MD2010B
-   Volvo Penta MD2010-C
-   Volvo Penta MD2010-D
-   Volvo Penta MD2020B
-   Volvo Penta MD2020-C
-   Volvo Penta MD2020-D

-   **Engine Family:** D, MD
-   **HP Range:** 13-20 HP

## ⚙️ Key Features

-   0.005 kg
-   12 applications across the D and MD series
-   Supersedes 21281436 and 861857
-   One superseded number was listed earlier as a plug

## 🔌 Function

Seals a casting core hole, expanding against the bore to make a pressure-tight joint.

## ⚠️ Common Signs of Failure

-   Coolant or oil seeping from a plug in the casting
-   Rust stain or wet trail running down from the plug
-   Plug pitted through, dished or loose in its bore
-   Unexplained coolant loss with sound hoses

## 🛠️ Service Notes

-   Two older numbers consolidate into this one, so an existing stock label may not match
-   3886427, 3886428 and 3886441 are the other expansion plug sizes in this group

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   3886430 → Supersedes 21281436

### OEM / Related Numbers

-   861857 earlier number superseded by this part
-   21281436 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 8.12 AUD
- **Vendor:** Volvo Penta
- **Type:** Engine Components
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 8.12 AUD | In stock |

## Images

- 3886430 Expansion Plug | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3886430-expansion-plug-genuine-volvo-penta)
> Updated: 2026-10-10