# 21455743 Plug | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine plug used in the cylinder-head and valve-train assembly of Volvo Penta TAD650VE and TAD660VE engines.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD550GE
-   Volvo Penta TAD551GE
-   Volvo Penta TAD750GE
-   Volvo Penta TAD751GE

-   **Engine Family:** TAD

## ⚙️ Key Features

-   Correct OEM thread and sealing dimensions
-   Closes the designated cylinder-head passage
-   Replaces or corresponds with earlier plug 20405895
-   Used in quantities of six on designated cylinder-head assemblies
-   Designed for engine heat and pressure
-   Quantity varies by assembly, most commonly six

## 🔌 Function

The plug closes a casting, oil or machining passage in the cylinder head.

## ⚠️ Common Signs of Failure

-   Oil or coolant seepage
-   Plug loosening
-   Cracked sealing area
-   Rounded installation drive

## 🛠️ 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 Supersession Chain

-   21455743 → Replaces or corresponds with 20405895

### OEM / Related Numbers

-   20405895 - Earlier plug reference

## 📦 Condition

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

## Details

- **Price:** 39.99 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 39.99 AUD | In stock |

## Images

- 21455743 Plug | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21455743-plug-genuine-volvo-penta)
> Updated: 2026-09-06