20405569 Sealing Ring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta sealing ring used in pairs around the engine-oil cooler core within housing 20485258 and related housings. It seals the cooler from the surrounding oil and coolant passages on D5 and D7 engines.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

• Oil- and coolant-resistant cooler-core seal
• Two used in the applicable oil-cooler housing
• Works with oil coolers 20715675, 20715679 or 20715681
• Used beside O-ring 20405578 and housing gasket 20405747
• Should be replaced in pairs whenever the cooler is removed
• Engine type: Volvo Penta 5- and 7-litre industrial diesel

🔌 Function

Seals the oil-cooler core to keep engine oil and coolant in their separate passages.

⚠️ Common Signs of Failure

• Oil appearing in the coolant
• Coolant contamination in the engine oil
• External leakage at the cooler housing
• Seal hardening, splitting or flattening
• Repeated leakage after cooler removal

🛠️ 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

• 20405569 → Supersedes 11700379

OEM / Related Numbers

• 11700379 earlier number superseded by this part
• 20485258 - oil-cooler housing
• 20715675 - related oil coolers
• 20715679 - related oil coolers
• 20715681 - related oil coolers
• 20405578 - related O-ring
• 20405747 - housing gasket
• 11700609 - related flange
• 20405752 - retaining screw

📦 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 TAD750GE, TAD750VE
• Volvo Penta TD520GE, TD520VE
• Volvo Penta TD720GE, TD720VE PP
• Volvo Penta TAD532GE EDC4
• Volvo Penta TAD550GE
• Volvo Penta TAD551GE
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TAD751GE
• Volvo Penta TAD760VE