# 3809563 Cap | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta cap from the Alternator, Charging, Electric Motor, Electric Drives group, weighing 0.020 kg and listed for 30 applications across D and TAD series engines. It supersedes part number 20503093, which was catalogued earlier as an idler pulley.

## 🚤 Compatibility

-   **Engine Family:** D, TAD

Full model list at the end of this description.

## ⚙️ Key Features

-   30 applications across D and TAD series engines
-   Supersedes 20503093
-   0.020 kg
-   Quantity varies by assembly, most commonly two

## 🔌 Function

Closes off and protects the opening it fits, keeping dirt and water out of the assembly behind it.

## ⚠️ Common Signs of Failure

-   Cap missing, cracked or split
-   Water or dirt found in the assembly behind it
-   Corrosion starting at the exposed opening
-   Cap loose and rattling in its seat

## 🛠️ Service Notes

-   The number this replaces was previously listed as an idler pulley, so if you are working from an old parts list expecting a pulley, confirm what your engine actually needs before ordering

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   3809563 → Supersedes 20503093

### OEM / Related Numbers

-   20503093 earlier number superseded by this part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 D9A2J, D9A2G, D9A2D, D9A2B, D9A2F, D9A2K, D9A2H, D9A2A, D9A2C, D9A2E
-   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 TAD1640-42GE-B, TAD1640GE
-   Volvo Penta TAD1641GE, TAD1641VE
-   Volvo Penta TAD1642GE, TAD1642VE
-   Volvo Penta TAD1643VE
-   Volvo Penta TAD1650GE
-   Volvo Penta TAD1651GE
-   Volvo Penta TAD1660-62VE
-   Volvo Penta TAD1662VE EU5
-   Volvo Penta TAD1670-72VE

## Details

- **Price:** 21.16 AUD
- **Vendor:** Volvo Penta
- **Type:** Charging & Alternators
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 21.16 AUD | In stock |

## Images

- 3809563 Cap | Genuine Volvo Penta Part
- 3809563 Cap | Genuine Volvo Penta Part - photo 2 of 2

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3809563-cap-genuine-volvo-penta)
> Updated: 2026-09-22