# 21666520 Plug | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine threaded plug used in the coolant-duct and cylinder-block assembly on selected Volvo Penta D13, TAD13 and TWD16 engines. It closes a machined coolant or service passage and works with sealing ring 21024032.

## 🚤 Compatibility

-   **Engine Family:** D, TAD, TWD
-   **HP Range:** Approximately 0-500 HP
-   **Year Range:** Approximately 2009 - 2021

Full model list at the end of this description.

## ⚙️ Key Features

-   Genuine Volvo Penta coolant-passage plug
-   Used with sealing ring 21024032
-   Factory thread and seating profile
-   Direct replacement for a corroded or leaking original plug
-   Engine type: 12.8L inline six-cylinder turbocharged diesel

## 🔌 Function

Closes the specified coolant or machining passage and retains cooling-system pressure.

## ⚠️ Common Signs of Failure

-   Coolant seepage around the plug
-   Corroded or damaged threads
-   Plug loosening after incorrect installation
-   Seal hardening or extrusion
-   Coolant loss and overheating

## 🛠️ Service Notes

-   Clean the threads and the seating face before fitting, and make sure the opening itself is clear of old sealant, swarf and corrosion
-   Renew the sealing washer or O-ring where one is fitted rather than reusing a flattened one, and only use thread sealant where the workshop manual for your engine calls for it
-   Tighten to the figure given in the workshop manual for your engine — plugs in aluminium and other soft castings strip easily, and a plug pulled up hard to cure a leak usually distorts the seat and makes it worse
-   Where the plug closes an oil, fuel or coolant passage, run the engine up to temperature afterwards and check the joint under pressure before signing the job off
-   Keep removed plugs paired with the holes they came out of during a strip-down — plugs of very similar appearance often differ in thread, reach or sealing type

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   21024032 - sealing ring
-   21677248 - coolant-duct cover
-   21420523 - related cover
-   20993042 - cylinder-block references
-   23489240 - cylinder-block references
-   21294062 - gasket
-   20979871 - seal
-   21046528 - clamp
-   20532891 - gasket

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D16C1-E MG, D16C1-F MG, D16C2-E MG, D16C2-F MG, D16C1-E MH, D16C1-F MH, D16C2-E MH, D16C2-F MH
-   Volvo Penta D13C4-B MH, D13C1-B MH, D13B-E MG, D13B-E MG (FE), D13B-N MH, D13B-N MH (FE)
-   Volvo Penta TAD1341-43GE-B, TAD1341VE, TAD1341GE
-   Volvo Penta TAD1344-45GE-B, TAD1344VE, TAD1344GE
-   Volvo Penta TAD1342VE, TAD1342GE
-   Volvo Penta TAD1343VE, TAD1343GE
-   Volvo Penta TAD1345GE, TAD1345VE
-   Volvo Penta TAD1350GE, TAD1350VE
-   Volvo Penta TAD1351GE, TAD1351-53VE
-   Volvo Penta TAD1340VE
-   Volvo Penta TAD1346GE
-   Volvo Penta TAD1352GE
-   Volvo Penta TAD1353GE
-   Volvo Penta TAD1354GE
-   Volvo Penta TAD1355GE
-   Volvo Penta TAD1360-62VE
-   Volvo Penta TAD1371-75VE
-   Volvo Penta TAD1643VE-B
-   Volvo Penta TAD1650VE-B/51VE
-   Volvo Penta TAD1670-72VE
-   Volvo Penta TWD1644-45GE
-   Volvo Penta TWD1672-1673GE
-   Volvo Penta TWD1682-83GE
-   Volvo Penta TWD1683VE

## Details

- **Price:** 11.33 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 11.33 AUD | In stock |

## Images

- 21666520 Plug | Genuine Volvo Penta Part
- 21666520 Plug | Genuine Volvo Penta Part - photo 2 of 2

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21666520-plug-genuine-volvo-penta)
> Updated: 2026-09-06