# 471706 Reduction Valve | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta reduction valve mounted between cylinders 4 and 5, from the Lubricating and Oil System group, weighing 70.3 g and listed for 31 applications across D and TWD series engines. It consolidates part numbers 21068158, 22192217 and 421125, the last of which was catalogued earlier as a reducing valve.

## 🚤 Compatibility

-   **Engine Family:** D, TWD
-   **HP Range:** 145-480 HP

Full model list at the end of this description.

## ⚙️ Key Features

-   Mounted between cylinders 4 and 5
-   70.3 g
-   Consolidates 21068158, 22192217 and 421125
-   31 applications across D and TWD engines

## 🔌 Function

Limits oil pressure in the gallery at its position by lifting against its spring once the set pressure is reached.

## ⚠️ Common Signs of Failure

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

## 🛠️ Service Notes

-   Position is the identifier here - this valve sits between cylinders 4 and 5, and it weighs the same 70.3 g as the Yellow valve 471707 and the White piston cooling valve 471646, so weight cannot separate them
-   Check the seat and the bore in the block while the valve is out

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   471706 → Supersedes 21068158

### OEM / Related Numbers

-   22192217 earlier number superseded by this part
-   421125 earlier number superseded by this part
-   21068158 earlier number superseded by this part

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D6-340I-G, D6-380I-G, D6-440I-G, D6-480I-G, D6-300A-G, D6-340A-G, D6-380A-G, D6-440I-WJ-G, D6-480I-WJ-G, D6-300D-G, D6-340D-G, D6-380D-G, D6-440D-G, D6-480D-G, D6-400A-G, D6-440A-G, D6-300I-G, D6-480A-G
-   Volvo Penta D4-175I-G, D4-230I-G, D4-270I-G, D4-320I-G, D4-300I-G, D4-150A-G, D4-230A-G, D4-270A-G, D4-320A-G, D4-300A-G, D4-145I-G, D4-175 VG
-   Volvo Penta TWD1744GE

## Details

- **Price:** 276.77 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 276.77 AUD | In stock |

## Images

- 471706 Reduction Valve | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/471706-reduction-valve-genuine-volvo-penta)
> Updated: 2026-08-22