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