# 20709930 Washer | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine service washer used in a Volvo Penta mounting or adjustment stack. It replaces earlier washer references 20405523 and 960144 and must be fitted in the exact position shown in the applicable engine arrangement.

## ⚙️ Key Features

-   Current washer reference replacing 20405523 and 960144
-   Bearing face distributes fastener load across the adjoining component
-   Thickness and outside diameter maintain the specified hardware stack
-   Surface finish is suitable for engine vibration and corrosion exposure
-   Must not be replaced by a generic washer of unknown hardness or thickness
-   Confirm position and quantity by serial-specific schematic

## 🔌 Function

Distributes clamping load and maintains the specified spacing in the associated fastener stack.

## ⚠️ Common Signs of Failure

-   The washer is cupped, cracked or corroded
-   The bearing surface is fretted or worn
-   The fastener pulls into the adjoining component
-   The assembled spacing becomes incorrect
-   Replacement is required after deformation or incorrect installation

## 🛠️ Service Notes

-   Check you are fitting the same type of washer that came out — plain, hardened, sealing and locking washers are not interchangeable, and the wrong one either fails to seal or fails to hold
-   Treat sealing washers on fuel, oil and coolant unions as single-use; they seal by deforming onto the faces, so a used one will not seal reliably a second time
-   Clean the seating faces and make sure the washer sits flat and square, fully under the head or nut, before tightening — a washer trapped on a chamfer or edge will crush unevenly
-   Tighten the fastener to the figure given in the workshop manual for your engine, and account for every washer on reassembly so none is left loose inside a housing or the engine bay

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   20709930 → Supersedes 20405523

### OEM / Related Numbers

-   20405523 earlier number superseded by this part
-   20709931 - Screw in the associated hardware group
-   20709932 - Spacer in the associated hardware group
-   20709933 - Nut in the associated hardware group

## 📦 Condition

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

## Details

- **Price:** 39.4 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 39.40 AUD | In stock |

## Images

- 20709930 Washer | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20709930-washer-genuine-volvo-penta)
> Updated: 2026-10-09