21424647 Belt Tensioner | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta D3 Automatic Accessory-Belt Tensioner - Part Number: 21424647

Genuine automatic belt tensioner for Volvo Penta D3 2.4-litre common-rail marine diesel engines. It maintains the correct load on the alternator and accessory-drive belt as the belt stretches and engine temperature changes.

⚙️ Key Features

• D3 automatic spring-loaded tensioner

• 2.4-litre five-cylinder marine diesel application

• Maintains accessory-belt tension

• Factory pulley alignment and spring rate

• D3 D- through H-generation application subject to serial confirmation

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 21424647 - Current OEM part number

OEM / Related Numbers:

• 21424647

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Confirmed engine family:

• D3-110 through D3-220 marine diesel engines where tensioner 21424647 is specified

• D-, E-, F-, G- and H-generation D3 installations subject to belt-drive confirmation

• Confirm pulley, belt layout and engine serial number

🔌 Function

The tensioner keeps the accessory belt tight enough to drive the alternator and related components without slip.

Common signs of failure:

• Belt squeal or flutter

• Tensioner arm oscillation

• Weak spring force

• Pulley-bearing noise

• Belt tracking off-centre

• Repeated belt wear

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging