978556 V-Belt | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta v-belt for use with 872021, weighing 0.204 kg and listed for eight applications across TD, TWD and TAD engines, superseding part number 966988. The tie to 872021 is the detail that decides this belt rather than one of the others on the same engine families.

🚤 Compatibility

Typically suits:

• Volvo Penta TD121G-87
• Volvo Penta TWD1211V
• Volvo Penta TWD1230ME
• Volvo Penta TWD1211P
• Volvo Penta TWD1210P
• Volvo Penta TWD1210V
• Volvo Penta TD121GP
• Volvo Penta TAD1230V

• Engine Family: TD, TWD, TAD

⚙️ Key Features

• For use with 872021
• Fits eight applications across TD, TWD and TAD engines
• 0.204 kg
• Supersedes 966988

🔌 Function

Carries drive from the crankshaft pulley to an engine-driven accessory such as the alternator or a circulation pump.

⚠️ Common Signs of Failure

• Squealing from the front of the engine on start-up or under load
• Charge warning light flickering, or the alternator falling behind
• Cracks across the back of the belt, or glazed and shiny flanks
• Black belt dust building up under the pulleys
• Belt turned over in the groove or thrown off the pulley

🛠️ Service Notes

• Check that the engine carries 872021 before ordering — several belts here cover TD, TWD and TAD, and this is the one tied to that number
• Check the pulley grooves for wear and misalignment while the belt is off

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 978556 → Supersedes 966988 → Supersedes 958321 → Supersedes 958366

OEM / Related Numbers

• 966988 earlier number superseded by this part
• 958321 earlier number superseded by this part
• 958366 earlier number superseded by this part

📦 Condition

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