# 421374 Valve Spring | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta valve spring from the Engine group, weighing 0.082 kg and listed for 12 applications across the D, AQD, TD, MD, TAMD and THAMD series.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D70CHC
-   Volvo Penta D70CRC
-   Volvo Penta AQD70B
-   Volvo Penta AQD70BL
-   Volvo Penta TD70B
-   Volvo Penta MD70B
-   Volvo Penta TAMD70B
-   Volvo Penta D70B
-   Volvo Penta THAMD70B
-   Volvo Penta TMD70B
-   Volvo Penta D42A
-   Volvo Penta MD70C

-   **Engine Family:** D, AQD, TD, MD, TAMD, THAMD, TMD

## ⚙️ Key Features

-   0.082 kg
-   12 applications across six engine series
-   Covers the less common THAMD series as well

## 🔌 Function

Closes the valve against its seat and keeps the valve gear in contact with the cam through the whole lift cycle.

## ⚠️ Common Signs of Failure

-   Valve gear noise and misfire at higher revolutions
-   Spring free length shorter than specification
-   Broken coil, most often at the end turn
-   Squared ends no longer sitting flat on the seat washer
-   Corrosion pitting on the wire, which starts a fatigue crack

## 🛠️ Service Notes

-   Replace valve springs as a complete set — one soft spring in an old set will fail again quickly
-   Check the retainer, lock plate and seat washer for wear at the same time
-   Measure free length and squareness against a new spring rather than judging by eye

## 📦 Condition

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

## Details

- **Price:** 18.84 AUD
- **Vendor:** Volvo Penta
- **Type:** Engine Components
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 18.84 AUD | In stock |

## Images

- 421374 Valve Spring | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/421374-valve-spring-genuine-volvo-penta)
> Updated: 2026-09-19