# 471640 Reduction Valve | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta reduction valve marked Red, from the Lubricating and Oil System group, weighing 63.5 g and listed for 38 applications across TAD, D, TWD, TID, TD and TADH series engines.

## 🚤 Compatibility

-   **Engine Family:** TAD, D, TWD, TID, TD, TADH

Full model list at the end of this description.

## ⚙️ Key Features

-   Colour-coded Red
-   63.5 g
-   38 applications across six engine series including TADH
-   Lubricating and Oil System group valve

## 🔌 Function

Limits oil pressure in its circuit by lifting against its spring once the set pressure is reached and bleeding the excess away.

## ⚠️ Common Signs of Failure

-   Oil pressure too high, too low or wandering
-   Valve stuck open so pressure never builds
-   Valve seized shut, giving pressure spikes
-   Debris on the seat so the valve weeps constantly
-   Spring collapsed or broken

## 🛠️ Service Notes

-   The colour is the setting, so it is the only reliable identifier: this is the Red valve at 63.5 g, while the Yellow valve 471707 and the White piston cooling valve 471646 both weigh 70.3 g
-   Never substitute a different colour to change oil pressure - fit the colour the engine calls for
-   Check the seat and the bore in the housing as well as the valve

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D8A2-A MP, D8A5-A MH, D8A6-A MH, D8A5-A MG, D8A6-A MG, D8A4-A MP, D8A1-A MP, D8A3-A MP
-   Volvo Penta TD61A, TD61ACE, TD61AG, TD61AP, TD61AW
-   Volvo Penta TWD610G, TWD610P, TWD610PB, TWD610V
-   Volvo Penta TD610G, TD610M, TD610V
-   Volvo Penta TAD570-72VE, TAD570-71VE-B
-   Volvo Penta TAD840GE, TAD840-43VE
-   Volvo Penta TAD880-82GE, TAD880-84VE
-   Volvo Penta TADH880-82GE, TADH880-84VE
-   Volvo Penta TD630ME, TD630VE
-   Volvo Penta TAD540-42VE
-   Volvo Penta TAD550-51VE
-   Volvo Penta TAD552VE
-   Volvo Penta TAD580-83VE
-   Volvo Penta TAD850-52VE
-   Volvo Penta TAD853VE
-   Volvo Penta TAD870-73VE
-   Volvo Penta TID61AG

## Details

- **Price:** 279.91 AUD
- **Vendor:** Volvo Penta
- **Type:** Oil & Lubrication
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 279.91 AUD | In stock |

## Images

- 471640 Reduction Valve | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/471640-reduction-valve-genuine-volvo-penta)
> Updated: 2026-09-06