# 22081685 Idler Gear | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta TAD1640-42GE-B Timing Idler Gear, part number 22081685. A genuine timing-train idler gear used on Volvo Penta TAD1640-42GE-B generator engines. It replaces earlier gear 20912432.

## 🚤 Compatibility

-   **Engine Family:** TAD, TWD, D
-   **Year Range:** Approximately 2010 - 2020

Full model list at the end of this description.

## ⚙️ Key Features

-   Precision-machined structural and running surfaces
-   Factory geometry for the specified bearing, timing or combustion assembly
-   Designed for continuous high-load diesel-engine operation
-   Requires correct lubrication, torque and assembly clearances
-   Matched to the exact engine generation and serial range
-   Engine type: 16.1L inline six-cylinder turbocharged generator diesel

## 🔌 Function

Supports or transfers the engine's rotating and structural loads while maintaining the specified timing, bearing alignment or cylinder geometry.

## ⚠️ Common Signs of Failure

-   Abnormal gear noise, vibration or loss of timing
-   Excessive backlash, bearing movement or bore wear
-   Oil, coolant or compression leakage
-   Severe engine damage if the component fails in service

## 🛠️ Service Notes

-   Inspect the gear teeth, the bearing or bushing and the shaft or hub it runs on together — a new gear on a worn shaft will be noisy and short-lived
-   Check the mating gears at the same time; a chipped or pitted tooth on either side will damage the new idler
-   Where the gear forms part of a timed drive, set it up to the timing marks and the procedure in the workshop manual for your engine and confirm timing before turning the engine over
-   Measure backlash and endfloat by the method in the manual rather than judging them by feel, and fit any thrust washer or plate in its original order and direction
-   Oil the bearing surfaces and teeth on assembly and turn the drive over by hand to check it runs free before the covers go back on

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   22081685 → Supersedes 22081686 → Supersedes 21284699 → Supersedes 20912432 → Supersedes 20867135 → Supersedes 20864026 → Supersedes 20568441 → Supersedes 20720683 → Supersedes 20555045

### OEM / Related Numbers

-   22081686 earlier number superseded by this part
-   21284699 earlier number superseded by this part
-   20912432 earlier number superseded by this part
-   20867135 earlier number superseded by this part
-   20864026 earlier number superseded by this part
-   20568441 earlier number superseded by this part
-   20720683 earlier number superseded by this part
-   20555045 earlier number superseded by this part
-   22438707 - timing-gear plate
-   949656 - O-ring
-   20568561 - shaft
-   914465 - snap rings
-   945504 - snap rings
-   21509046 - related idler-gear references
-   23493799 - related idler-gear references
-   20743007 - related idler gear
-   8131850 - thrust washer
-   21012985 - hub
-   21872746 - cover
-   992065 - O-rings
-   943177 - O-rings
-   22066002 - support bracket

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D16C1-E MG, D16C1-F MG, D16C2-E MG, D16C2-F MG, D16C-D MH, D16C1-E MH, D16C1-F MH, D16C2-E MH, D16C2-F MH
-   Volvo Penta TAD1640-42GE-B, TAD1640GE, TAD1640VE-B, TAD1640-42VE-C
-   Volvo Penta TAD1641VE-B, TAD1641GE, TAD1641VE
-   Volvo Penta TAD1642VE-B, TAD1642GE, TAD1642VE
-   Volvo Penta TAD1643VE-B, TAD1643VE
-   Volvo Penta TAD1650VE-B/51VE, TAD1650GE
-   Volvo Penta TWD1683GE-B, TWD1683VE
-   Volvo Penta TAD1651GE
-   Volvo Penta TAD1660-62VE
-   Volvo Penta TAD1662VE EU5
-   Volvo Penta TAD1670-72VE
-   Volvo Penta TWD1643GE
-   Volvo Penta TWD1644-45GE
-   Volvo Penta TWD1652GE
-   Volvo Penta TWD1653GE
-   Volvo Penta TWD1663GE
-   Volvo Penta TWD1672-1673GE
-   Volvo Penta TWD1682-83GE
-   Volvo Penta TWD1744GE

## Details

- **Price:** 967.31 AUD
- **Vendor:** Volvo Penta
- **Type:** Engine Components
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 967.31 AUD | In stock |

## Images

- 22081685 Idler Gear | Genuine Volvo Penta Part
- 22081685 Idler Gear | Genuine Volvo Penta Part - photo 2 of 2

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/22081685-idler-gear-genuine-volvo-penta)
> Updated: 2026-09-19