# 3886428 Expansion Plug | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta expansion plug from the Engine group, weighing 0.014 kg and listed for 33 applications across the D and MD series. It supersedes part number 861802. This is the heaviest of the four expansion plugs in this group, the others being 3886427, 3886430 and 3886441.

## 🚤 Compatibility

-   **Engine Family:** D, MD
-   **HP Range:** 13-75 HP

Full model list at the end of this description.

## ⚙️ Key Features

-   0.014 kg
-   33 applications across the D and MD series
-   Supersedes 861802
-   Largest of the four expansion plugs in this group

## 🔌 Function

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

## ⚠️ Common Signs of Failure

-   Coolant or oil weeping from a plug in the casting
-   Rust stain or wet trail below the plug
-   Plug dished, pitted or standing proud of its bore
-   Coolant loss with no external hose fault

## 🛠️ Service Notes

-   Check the plug diameter called for on your engine, as 3886427, 3886430 and 3886441 are the other sizes
-   Clean the bore of scale before fitting so the plug can expand evenly

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   3886428 → Supersedes 861802

### OEM / Related Numbers

-   861802 earlier number superseded by this part

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D2-40, D2-40B, D2-40F, D2-55, D2-55B, D2-55C, D2-55D, D2-55E, D2-55F, D2-50F, D2-75, D2-75B, D2-75C, D2-75F, D2-60F
-   Volvo Penta D1-30, D1-30B, D1-30F, D1-13, D1-13B, D1-13F, D1-20, D1-20B, D1-20F
-   Volvo Penta MD2010B, MD2010-C, MD2010-D
-   Volvo Penta MD2020B, MD2020-C, MD2020-D
-   Volvo Penta MD2030B, MD2030-C, MD2030-D

## Details

- **Price:** 9.66 AUD
- **Vendor:** Volvo Penta
- **Type:** Engine Components
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 9.66 AUD | In stock |

## Images

- 3886428 Expansion Plug | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3886428-expansion-plug-genuine-volvo-penta)
> Updated: 2026-10-09