# 479985 Gear | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta gear with a hole for a guide pin, from the Fuel System group, weighing 2.515 kg and listed for 5 applications across TWD and DH series engines. It consolidates part numbers 1638092, 1638094 and 477535, which were catalogued earlier as an injection timing device. Volvo Penta lists this part for engines from engine serial number 259068 onward.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TWD630ME
-   Volvo Penta TWD730ME
-   Volvo Penta TWD1030ME
-   Volvo Penta TWD630VE
-   Volvo Penta DH10A

-   **Engine Family:** TWD, DH
-   **Serial Range:** With hole for a guide pin., SNXXXXXXXXXX/259068-

## ⚙️ Key Features

-   With hole for a guide pin
-   2.515 kg
-   5 applications across TWD and DH series engines
-   Consolidates 1638092, 1638094 and 477535
-   Fitted from engine serial number 259068 onward

## 🔌 Function

Drives the injection pump from the timing train, with the guide pin hole setting the pump's angular position so injection occurs at the right point in the cycle.

## ⚠️ Common Signs of Failure

-   Injection timing drifting from specification, with smoke or hard starting
-   Rattle or knock from the timing gear housing at idle
-   Tooth flanks worn, pitted or chipped on inspection
-   Guide pin hole worn oval, so the pump cannot be set accurately
-   Loss of power with no fault found in the pump itself

## 🛠️ Service Notes

-   The earlier numbers were listed as an injection timing device, so the replacement scope is broader than the gear alone - check what your engine actually needs
-   Timing must be reset with the pump after fitting; mark everything before stripping

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   479985 → Supersedes 1638092

### OEM / Related Numbers

-   477535 earlier number superseded by this part
-   1638092 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 1408.26 AUD
- **Vendor:** Volvo Penta
- **Type:** Fuel System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1408.26 AUD | In stock |

## Images

- 479985 Gear | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/479985-gear-genuine-volvo-penta)
> Updated: 2026-10-09