20405535 O-Ring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta O-ring used around charge-air and inlet-pipe adapter 20405944. One or two O-rings are used according to the inlet or charge-air cooler arrangement.

🚤 Compatibility

• Engine Family: D, TD, TAD

Full model list at the end of this description.

⚙️ Key Features

• Heat- and oil-mist-resistant charge-air seal
• Used with adapter 20405944
• One or two fitted according to the engine arrangement
• Seals pressurised intake air between the pipe and adapter
• Should be lubricated and renewed whenever the joint is separated
• Engine type: Volvo Penta 5- and 7-litre turbocharged industrial diesel
• Quantity varies by assembly, most commonly two

🔌 Function

Seals the charge-air adapter so compressed intake air reaches the inlet manifold without boost leakage.

⚠️ Common Signs of Failure

• Boost-air hiss or whistle
• Oil mist around the adapter joint
• Increased black smoke
• O-ring cut, flattened or extruded

🛠️ Service Notes

• Always fit a new O-ring — never refit one that has been removed, as it has already taken a set in its groove
• Clean the groove and both sealing faces and check them for nicks, scoring and corrosion pitting; a damaged groove will leak however good the new seal is
• Smear the ring with a little clean lubricant compatible with the fluid it seals, then roll it into place by hand so it sits untwisted and fully in its groove
• Never lever an O-ring over a sharp edge or thread with a screwdriver; use a blunt plastic tool and protect any edge the ring has to pass
• Assemble the joint squarely and tighten to the figure and sequence given in the workshop manual for your engine — over-tightening extrudes the ring and causes the very leak you were curing

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20405535 → Supersedes 20451014

OEM / Related Numbers

• 20460317 earlier number superseded by this part
• 20460316 earlier number superseded by this part
• 20405944 - related charge-air pipe adapter
• 21664162 - related charge-air pipes in later arrangements
• 21664145 - related charge-air pipes in later arrangements
• 20405536 - related inlet tube sealing ring

📦 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 TAD720GE, TAD720VE
• Volvo Penta TAD721GE, TAD721VE
• Volvo Penta TAD722GE, TAD722VE
• Volvo Penta TAD730GE MECH, TAD730GE EDC4
• Volvo Penta TAD731GE MECH, TAD731GE EDC4
• Volvo Penta TD720GE, TD720VE PP
• Volvo Penta D5A-T
• Volvo Penta TAD650VE
• Volvo Penta TAD660VE
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TAD734GE
• Volvo Penta TAD750VE
• Volvo Penta TAD752GE
• Volvo Penta TAD753GE
• Volvo Penta TAD754GE
• Volvo Penta TAD760VE
• Volvo Penta TD520VE