978774 V-Belt Set | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta v-belt set, 1313 mm long, weighing 0.308 kg and listed for four applications across TAD engines. It supersedes 966397, which was catalogued earlier as a single v-belt — so the current part is a set where the old number was one belt, and the 1313 mm length is what identifies it.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD720VE
• Volvo Penta TAD721VE
• Volvo Penta TAD722VE
• Volvo Penta TAD520VE

• Engine Family: TAD

⚙️ Key Features

• 1313 mm long
• Supplied as a set, not as a single belt
• Fits four applications across TAD engines
• 0.308 kg
• Supersedes 966397, catalogued earlier as a single v-belt
• L=1313mm (Volvo assembly listing)

🔌 Function

Drives an accessory off the crankshaft, supplied as a set so the belts running together are all renewed at the same time.

⚠️ Common Signs of Failure

• Squealing from the front of the engine on start-up or under load
• One belt visibly slacker or running deeper in its groove than its neighbour
• Cracks across the back of a belt, or glazed and shiny flanks
• Black belt dust building up under the pulleys
• Charge warning light flickering, or the alternator falling behind

🛠️ Service Notes

• The number it replaces was listed as a single belt and this one is a set — check what your installation actually runs before ordering, so you neither come up short nor buy twice
• Do not fit one new belt alongside an old one from the set

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 978774 → Supersedes 966397

OEM / Related Numbers

• 966397 earlier number superseded by this part

📦 Condition

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