20405728 Sealing Ring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta sealing ring used at a cylinder-block opening and in the energised-to-run stop-solenoid assembly. The same part number is also included in engine overhaul seal lists, so the exact position must be confirmed from the serial-specific schematic.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

• Oil- and fuel-resistant sealing ring
• Confirmed at the cylinder-block stop-solenoid opening
• Used with energised-to-run stop-solenoid hardware
• Also included in engine overhaul seal arrangements
• Exact groove and component position must be matched before installation
• Engine type: Volvo Penta 5- and 7-litre industrial diesel
• Quantity varies by assembly, most commonly one

🔌 Function

Seals the stop-solenoid or cylinder-block opening against fuel, oil and contamination leakage.

⚠️ Common Signs of Failure

• Fuel or oil seepage around the solenoid opening
• Air or contamination entering the assembly
• Ring cut, flattened or hardened
• Stop-solenoid sticking after leakage
• Leakage caused by fitting the seal in the wrong groove

🛠️ 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

• 20405728 → Supersedes 11700603

OEM / Related Numbers

• 11700603 earlier number superseded by this part
• 20702078 - related block plug for engines without stop solenoid
• 20464561 - related block plugs
• 20464563 - related block plugs

📦 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