# 478777 Gear | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta gear marked Nitro, weighing 1.196 kg and listed for 65 applications across the TAD, TD, TWD and TID series.

## 🚤 Compatibility

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

Full model list at the end of this description.

## ⚙️ Key Features

-   Marked Nitro
-   1.196 kg
-   65 applications across the TAD, TD, TWD and TID series
-   Gear 478289 is the close sibling at 1.213 kg, for engines from serial number 155516 onwards

## 🔌 Function

Transmits drive through the timing train, keeping the driven shafts in phase with the crankshaft.

## ⚠️ Common Signs of Failure

-   Whine or growl from the timing end of the engine
-   Rattle at idle that changes under load
-   Bright metal debris in the oil or filter
-   Teeth found pitted, chipped or worn to a step
-   Backlash measured outside specification

## 🛠️ Service Notes

-   Gear 478289 sits only 17 grams away at 1.213 kg with a very similar application list, so weight is no guide, order by the Nitro marking and the part number
-   Check the mating gears and the idler bearing for matching wear and set backlash on assembly

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta TD61A, TD61ACE, TD61AG, TD61AGP, TD61AP, TD61APB, TD61AW
-   Volvo Penta TD71A, TD71ACE, TD71AG, TD71AGP, TD71AP, TD71APB, TD71AW
-   Volvo Penta TID71A, TID71AG, TID71AGP, TID71AP, TID71APB
-   Volvo Penta TWD1210G, TWD1210P, TWD1210PB, TWD1210V
-   Volvo Penta TWD610G, TWD610P, TWD610PB, TWD610V
-   Volvo Penta TAD1030P, TAD1030V, TAD1030VE
-   Volvo Penta TD121G-87, TD121GP, TD121GPB
-   Volvo Penta TD610G, TD610M, TD610V
-   Volvo Penta TWD1211V, TWD1211P, TWD1211G
-   Volvo Penta TWD710P, TWD710PB, TWD710V
-   Volvo Penta TAD730P, TAD730V
-   Volvo Penta TD630ME, TD630VE
-   Volvo Penta TD730ME, TD730VE
-   Volvo Penta TID61AG, TID61AGP
-   Volvo Penta TWD1230ME, TWD1230VE
-   Volvo Penta TWD630ME, TWD630VE
-   Volvo Penta TAD1230V
-   Volvo Penta TD100G
-   Volvo Penta TD1030VE
-   Volvo Penta TD1210G
-   Volvo Penta TD640VE
-   Volvo Penta TWD1030ME
-   Volvo Penta TWD1031VE
-   Volvo Penta TWD1231VE
-   Volvo Penta TWD730ME
-   Volvo Penta TWD731VE
-   Volvo Penta TWD740VE

## Details

- **Price:** 1026.56 AUD
- **Vendor:** Volvo Penta
- **Type:** Engine Components
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1026.56 AUD | In stock |

## Images

- 478777 Gear | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/478777-gear-genuine-volvo-penta)
> Updated: 2026-09-21