# 21304975 Piston Ring | Genuine Volvo Penta Part

## 🔧 Product Description

A matched piston-ring set used on selected Volvo Penta D5, D7 and TAD engines. One set is required for each piston and it replaces earlier ring reference 20405571.

## 🚤 Compatibility

-   **Engine Family:** D, TD, TAD, MD

Full model list at the end of this description.

## ⚙️ Key Features

-   Supersedes 20405571
-   One set required per piston
-   Controls compression, oil consumption and cylinder sealing
-   Engine type: Four- or six-cylinder turbocharged diesel
-   4 used per assembly

## 🔌 Function

Seals combustion pressure, controls lubricating oil on the cylinder wall and transfers heat from the piston to the liner.

## ⚠️ Common Signs of Failure

-   Excessive crankcase blow-by
-   High engine-oil consumption
-   Blue exhaust smoke
-   Scored liner or damaged ring grooves

## 🛠️ Service Notes

-   Supersedes earlier ring reference 20405571 - confirm current stock matches your engine's parts list before ordering
-   One set is required per piston; four-cylinder engines in this range need four sets in total
-   Check the ring end gap against the actual bore before fitting, and do not fit new rings to a bore outside specification

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21304975 → Supersedes 20405571

### OEM / Related Numbers

-   20405571 earlier number superseded by this part
-   20405577 - piston pin
-   20405576 - snap ring
-   20412762 - O-ring
-   20585982 - connecting rod

### Other-Brand OEM Numbers

-   MAHLE 099 RS 00127 0N0
-   GOETZE ENGINE 08-136900-00
-   Kolbenschmidt: 800071210000
-   Kolbenschmidt: 80 00344 1 0 000
-   Goetze Engine: 06-136900-00
-   Goetze Engine: 06-863000-20
-   Goetze Engine: 08-430000-00

### Aftermarket / Verified Equivalents

-   DT Spare Parts: 2.94579
-   Freccia: FR10-516600
-   Mec-Diesel: 812410

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D7A-B TA, D7A-T, D7A-TA, D7C-B TA, D7C-TA
-   Volvo Penta D5A-B TA, D5A-T, D5A-TA
-   Volvo Penta MD2010, MD2010B
-   Volvo Penta TAD520GE, TAD520VE
-   Volvo Penta TAD530GE MECH, TAD530GE EDC4
-   Volvo Penta TAD531GE MECH, TAD531GE EDC4
-   Volvo Penta TAD720GE, TAD720VE
-   Volvo Penta TAD721GE, TAD721VE
-   Volvo Penta TAD722GE, TAD722VE
-   Volvo Penta TAD730GE MECH, TAD730GE EDC4
-   Volvo Penta TAD731GE MECH, TAD731GE EDC4
-   Volvo Penta TD520GE, TD520VE
-   Volvo Penta TAD532GE EDC4
-   Volvo Penta TAD732GE EDC4
-   Volvo Penta TAD733GE EDC4
-   Volvo Penta TD720GE

## Details

- **Price:** 140.48 AUD
- **Vendor:** Volvo Penta
- **Type:** Engine Components
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 140.48 AUD | In stock |

## Images

- 21304975 Piston Ring | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21304975-piston-ring-genuine-volvo-penta)
> Updated: 2026-10-10