# 20840747 Spring Disc | Genuine Volvo Penta Part

## 🔧 Product Description

Application-specific Valve Spring Disc used in the cylinder head, valve train and combustion sealing assembly on the listed Volvo Penta engines. Supports the valve spring and distributes spring load across the cylinder-head seating surface.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TD420VE
-   Volvo Penta TAD620VE
-   Volvo Penta TAD650VE
-   Volvo Penta TAD660VE
-   Volvo Penta TAD420VE

-   **Engine Family:** TD, TAD
-   **HP Range:** Approximately 180-250 HP
-   **Year Range:** Approximately 2004 - 2015

## ⚙️ Key Features

-   Genuine Volvo Penta Valve Spring Disc
-   Designed for the cylinder head, valve train and combustion sealing assembly
-   Supports the valve spring and distributes spring load across the cylinder-head seating surface
-   Catalogued for TAD650VE; TAD660VE; D6E
-   Engine type: 6-litre six-cylinder turbocharged diesel

## 🔌 Function

Supports the valve spring and distributes spring load across the cylinder-head seating surface.

## ⚠️ Common Signs of Failure

-   Low compression, abnormal combustion or cylinder imbalance
-   Knocking, tapping or abnormal valve-train noise
-   Excessive oil consumption, blow-by or exhaust smoke
-   Out-of-spec clearance, wear, scoring or heat damage during overhaul
-   Loss of power or metallic debris found in the lubricating oil

## 🛠️ Service Notes

-   Measure all mating parts and clearances against the exact engine specification rather than replacing the component by appearance alone.
-   Use clean engine-assembly practices, correct lubricants and the specified tightening sequence.

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   20459851 - valve-spring references
-   20758484 - valve-spring references
-   3884937 - cylinder-head kit
-   20798699 - inlet valve
-   20798533 - exhaust valve
-   20459857 - valve cotter
-   20459855 - valve-stem seal
-   20799076 - tappet
-   20849976 - intake valve seat
-   20849979 - exhaust valve insert

### Other-Brand OEM Numbers

-   VOE20840747 - Volvo Construction Equipment prefixed number format

### Aftermarket / Verified Equivalents

-   SRP: SD-40747

## 📦 Condition

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

## Details

- **Price:** 23.74 AUD
- **Vendor:** Volvo Penta
- **Type:** Engine Components
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 23.74 AUD | In stock |

## Images

- 20840747 Spring Disc | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20840747-spring-disc-genuine-volvo-penta)
> Updated: 2026-09-21