855669 Tensioner | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta tensioner from the Alternator, Charging, Electric Motor and Electric Drives group, weighing 0.193 kg and listed for 16 applications on AQ series engines. It supersedes part number 841899.

🚤 Compatibility

Typically suits:

• Volvo Penta AQ125B
• Volvo Penta AQ131A
• Volvo Penta AQ131B
• Volvo Penta AQ131C
• Volvo Penta AQ131D
• Volvo Penta AQ151A
• Volvo Penta AQ151B
• Volvo Penta AQ151C
• Volvo Penta AQ171A
• Volvo Penta AQ171C
• Volvo Penta AQ145B
• Volvo Penta 230A
• Volvo Penta 230B
• Volvo Penta 250A
• Volvo Penta 250B
• Volvo Penta 251A

• Engine Family: AQ

⚙️ Key Features

• 0.193 kg
• For AQ series engines
• 16 listed applications
• Supersedes 841899

🔌 Function

Keeps the drive belt at its working tension so the driven components are turned without the belt slipping or being over-strained.

⚠️ Common Signs of Failure

• Belt squeal on start-up or as electrical load comes on
• Black belt dust collecting around the pulleys
• Battery not charging because the belt is slipping
• Tensioner seized, notchy or rattling when moved by hand
• Belt edges frayed from running out of line

🛠️ Service Notes

• The other tensioner listed here, 855390, covers 44 applications across five series and applies from serial number 67511 onwards, so check which arrangement your engine uses before ordering
• Fit a new belt with the tensioner and recheck the tension after a few hours of running

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 855669 → Supersedes 841899 → Supersedes 831925

OEM / Related Numbers

• 841899 earlier number superseded by this part
• 831925 earlier number superseded by this part

📦 Condition

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