# 20799731 Washer | Genuine Volvo Penta Part

## 🔧 Product Description

OEM fastening or load-distribution component used in the generator-engine charging/regulator and belt-pulley assembly. It restores the specified thread, strength, length and clamping geometry required by the original Volvo Penta assembly.

## 🚤 Compatibility

-   **Engine Family:** TD, TAD
-   **HP Range:** Approximately 320 HP
-   **Year Range:** Approximately 2000s-2010s

Full model list at the end of this description.

## ⚙️ Key Features

-   Earlier-production washer
-   0.007 kg
-   28 applications across TD and TAD-series engines
-   Supersedes 20405588
-   Stud 20799728 supersedes the consecutive old number 20405587 and carries the same 28 applications
-   Quantity varies by assembly, most commonly 12

## 🔌 Function

Spreads the nut or screw load over the mounting face so the clamp load is held without the fastener digging into the component.

## ⚠️ Common Signs of Failure

-   Fastener found loose with the joint working
-   The mounting face found dished or bruised where the washer has bedded in
-   Washer found flattened, dished or cracked
-   Fretting or a bright witness ring under the washer
-   Corrosion between the washer and the mounting face

## 🛠️ Service Notes

-   This is the earlier-production washer, so check which production version your engine takes before ordering
-   Stud 20799728 supersedes 20405588's neighbouring number 20405587 and shares the same 28 applications, so the two are commonly renewed together

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   20799731 → Supersedes 20405588

### OEM / Related Numbers

-   20405588 earlier number superseded by this part
-   21034749 connector
-   20834412 regulator mounting plate
-   973924 and 955271 mounting screws
-   20859762 washer
-   990940 nut
-   20459181 clamp
-   969405 socket screw
-   21259035 cable - later superseded by 22843492
-   20799737 and 20799739 pulley configurations
-   20796079 flange nut

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta TAD530GE MECH, TAD530GE EDC4
-   Volvo Penta TAD531GE MECH, TAD531GE EDC4
-   Volvo Penta TAD720GE, TAD720VE
-   Volvo Penta TAD721GE, TAD721VE
-   Volvo Penta TAD722GE, TAD722VE
-   Volvo Penta TAD730GE MECH, TAD730GE EDC4
-   Volvo Penta TAD731GE MECH, TAD731GE EDC4
-   Volvo Penta TD720GE, TD720VE PP
-   Volvo Penta TAD420VE
-   Volvo Penta TAD520VE
-   Volvo Penta TAD532GE EDC4
-   Volvo Penta TAD620VE
-   Volvo Penta TAD650VE
-   Volvo Penta TAD660VE
-   Volvo Penta TAD732GE EDC4
-   Volvo Penta TAD733GE EDC4
-   Volvo Penta TAD750VE
-   Volvo Penta TAD760VE
-   Volvo Penta TD420VE
-   Volvo Penta TD520GE

## Details

- **Price:** 2.81 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2.81 AUD | In stock |

## Images

- 20799731 Washer | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20799731-washer-genuine-volvo-penta)
> Updated: 2026-09-19