21108676 Sealing Ring | Genuine Volvo Penta Part

🔧 Product Description

Brand-new genuine Volvo Penta sealing ring for the common-rail fuel leak-off/return line on TAD5 and TAD7 engines. It seals the pipe union against diesel leakage and air entry and should be renewed whenever the joint is disturbed.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD550GE
• Volvo Penta TAD551GE
• Volvo Penta TAD560VE
• Volvo Penta TAD561VE
• Volvo Penta TAD734GE
• Volvo Penta TAD750GE
• Volvo Penta TAD751GE
• Volvo Penta TAD752GE
• Volvo Penta TAD753GE
• Volvo Penta TAD754GE
• Volvo Penta TAD765VE
• Volvo Penta TAD764VE
• Volvo Penta TAD763VE
• Volvo Penta TAD762VE
• Volvo Penta TAD761VE

• Engine Family: TAD

⚙️ Key Features

• Fuel-compatible seal for the injector leak-off circuit
• Used with return/leak-off pipe 21156370 on applicable engines
• Correct section for the machined fuel connection
• Single-use service item
• One sealing ring supplied
• Engine type: Volvo Penta 5- and 7-litre common-rail industrial diesel
• Quantity varies by assembly, most commonly four

🔌 Function

Seals the low-pressure injector return connection so fuel remains contained and the return circuit cannot draw air.

⚠️ Common Signs of Failure

• Diesel wetness around the union
• Fuel smell after shutdown
• Hard starting after fuel-system work
• Ring cut or flattened
• Repeated leakage from a scratched sealing face

🛠️ Service Notes

• Always fit a new sealing ring rather than reusing the old one — a ring that has been compressed once has taken a set and will not seal reliably a second time
• Clean the groove or seat and check it for scoring, corrosion and old sealant before fitting; a mark across the sealing face will leak however good the ring is
• Ease the ring into place without stretching, twisting or dragging it over sharp edges or threads, and check it is seated squarely all the way round before closing the joint
• Do not add sealant or jointing compound unless the workshop manual for your engine calls for it, and tighten the joint or union to the figure given in that manual
• Check the joint for weeping once the engine has been run up to temperature and allowed to cool, as many sealing rings only show a leak after a heat cycle

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21108676 → Supersedes 21084189

OEM / Related Numbers

• 21084189 earlier number superseded by this part
• Earlier reference 21022796
• Leak-off line 21156370

Other-Brand OEM Numbers

• VOE21108676

📦 Condition

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