# 21826866 Belt Tensioner | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta Automatic Accessory-Belt Tensioner - Part Number: 21826866

  

Spring-loaded automatic belt tensioner for Volvo Penta D3 accessory drives. It maintains belt tension as the belt wears and dampens belt vibration across the alternator and accessory pulleys.

  

⚙️ Key Features

  

• Maintains automatic belt tension

• Damps belt oscillation

• Factory pulley alignment

• Designed for the specified belt path

• Engine-model controlled

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 21826866 (current listed OEM reference)

  

OEM / Related Numbers:

  

• 21826866

• Accessory drive must be matched to the installed belt, pulley arrangement and engine product number

  

Aftermarket / Verified Equivalents:

  

• Optibelt 3234SR

• Gates T39290 / MVTP01078

• Dayco APV2740

• Hutchinson T0451

• Febi Bilstein 49398

• Ruville 56559

• Schaeffler INA 534 0605 10

• SNR GA365.47

• SKF VKM 36244

• Continental CTAM V85725

• SWAG 55 94 9398

• Triscan 8641 273005

• Optimal 0-N1964

• Autokit 03.81766

• Confirm pulley diameter, offset and complete D3 accessory-drive arrangement before substitution

  

🚤 Compatibility

  

Commonly used on:

  

• Volvo Penta D3 accessory-belt drive

  

Typically suits:

  

• Engine / drive models:

  

• D3-140

• D3-170

• D3-200

• D3-220

  

• HP / Rating: 140-220 hp

  

• Engine / System Type: Five-cylinder common-rail marine diesel

  

• Year Range: D3 model-generation controlled

  

• Serial / Specification Control: Confirm the complete product number and serial number before ordering; 21826866 must be listed for the installation

  

🔌 Function

  

Maintains automatic belt tension and absorbs transient belt movement.

  

Common signs of failure:

  

• Belt squeal or flutter

• Tensioner arm vibration

• Rough or noisy pulley bearing

• Weak spring force

• Misaligned or unevenly worn belt

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 567.31 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 567.31 AUD | In stock |

## Images

- 21826866 Belt Tensioner | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21826866-belt-tensioner-genuine-volvo-penta)
> Updated: 2026-08-03