20405907 Sealing Ring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta sealing ring used around each Stage 1 unit injection pump. Twelve rings are used in the four-pump TD520GE arrangement, forming the multi-seal stack between the pump body and engine block.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

• Fuel- and oil-resistant unit-pump sealing ring
• Twelve used with four Stage 1 pumps in the TD520GE arrangement
• Used with injection pump 11700423 / exchange pump 3803515
• Works with base shims 20405543 and selectable timing shims
• All rings on a removed pump should be renewed
• Engine type: Volvo Penta four- and six-cylinder mechanical unit-pump diesel

🔌 Function

Seals the unit injection pump to the engine block, separating fuel, lubricating oil and the external environment.

⚠️ Common Signs of Failure

• Fuel or engine-oil leakage around a unit pump
• Seal swelling, cutting or hardening
• Pump difficult to seat correctly
• Leakage after pump replacement

🛠️ 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 / Related Numbers

• 11700423 - Stage 1 injection pump
• 20405543 - base shims
• 20881345-20881454 - timing-shim range
• 20405565 - pump mounting flange

OEM Reman Alternatives

• 3803515 - Volvo Penta exchange injection pump

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D7A-B TA, D7A-T, D7A-TA, D7C-B TA, D7C-TA
• Volvo Penta D5A-B TA, D5A-T, D5A-TA
• Volvo Penta MD2010, MD2010B
• Volvo Penta TAD520GE, TAD520VE
• Volvo Penta TAD530GE MECH, TAD530GE EDC4
• Volvo Penta TAD531GE MECH, TAD531GE EDC4
• Volvo Penta TAD720GE, TAD720VE
• Volvo Penta TAD721GE, TAD721VE
• Volvo Penta TAD722GE, TAD722VE
• Volvo Penta TAD730GE MECH, TAD730GE EDC4
• Volvo Penta TAD731GE MECH, TAD731GE EDC4
• Volvo Penta TD520GE, TD520VE
• Volvo Penta TD720GE, TD720VE PP
• Volvo Penta TAD420VE
• Volvo Penta TAD532GE EDC4
• Volvo Penta TAD620VE
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TD420VE