# 21399013 Plug | Genuine Volvo Penta Part

## 🔧 Product Description

Threaded sealing plug used with O-ring 21286721 in specified Volvo Penta catalyst-equipped gasoline-engine exhaust manifolds and elbows. It closes its designated port while maintaining the water and exhaust separation required by the catalyst and wet-exhaust assembly.

## 🚤 Compatibility

-   **Engine Family:** V
-   **HP Range:** 225-320 HP

Full model list at the end of this description.

## ⚙️ Key Features

-   Genuine Volvo Penta exhaust-manifold sealing plug
-   Used with O-ring 21286721
-   Designed for catalyst-equipped gasoline exhaust assemblies
-   Correct thread, shoulder and sealing geometry
-   Common illustrated quantity of four in specified assemblies
-   Engine type: Volvo Penta gasoline V8 with catalytic wet-exhaust system
-   4 used per assembly

## 🔌 Function

Seals the designated manifold or elbow port so cooling water and exhaust gases remain within their intended passages.

## ⚠️ Common Signs of Failure

-   Water or soot staining around the plug
-   Flattened, cut or hardened O-ring
-   Corroded plug or damaged threads
-   Plug loosening from heat cycling or incorrect torque
-   Internal or external leakage around the exhaust manifold port

## 🛠️ 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

-   21286721 - required sealing O-ring
-   21399010 - separate M27 connector/plug used elsewhere in the assembly; not interchangeable

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta 5.7GXiC-320-R, 5.7GXiCE-320-R, 5.7GXiC-J, 5.7GXiC-JF, 5.7GXiCE-JF, 5.7GXiCE-J, 5.7GXiCE-M, 5.7GXiC-P, 5.7GXiCE-P, 5.7GiCE-300-M, 5.7GiCE-300-MF, 5.7GiC-300-J, 5.7GiCE-300-J, 5.7GiCE-300-JF, 5.7GiC-300-JF, 5.7GiC-300-P, 5.7GiCE-300-P, 5.7GiC-300-R, 5.7GiCE-300-R, 5.0GiC-225-S, 5.0GiCE-225-S, 5.0GiC-J, 5.0GXiCE-JF, 5.0GXiCE-J, 5.0GXiC-JF, 5.0GXiCE-M, 5.0GXiCE-MF, 5.0GXiC-P, 5.0GXiCE-P, 5.0GXiC-270-R, 5.0GXiCE-270-R, 5.0GXiC-J
-   Volvo Penta V8-270-C-B, V8-270-CE-B, V8-300-C-A, V8-300-CE-A, V8-300-C-B, V8-320-C-B, V8-320-CE-B, V8-300-CE-B, V8-320-C-A, V8-320-CE-A, V8-225-C-A, V8-225-CE-A, V8-225-C-B, V8-225-CE-B, V8-270-C-A, V8-270-CE-A

## Details

- **Price:** 8.14 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 8.14 AUD | In stock |

## Images

- 21399013 Plug | Genuine Volvo Penta Part
- 21399013 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/21399013-plug-genuine-volvo-penta)
> Updated: 2026-10-11