20459904 O-Ring | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta o-ring used in the engine fluid or pressure sealing joint. It is supplied as an individual service component under part number 20459904 and is intended to restore the original fit, sealing, alignment, retention or operating function of the specified assembly. This listing supplies the named part only; adjoining components shown in the engine arrangement are serviced separately unless explicitly stated.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

• Supersedes 20459974
• 0.002 kg
• 36 applications across D, TD, TAD and MD engines

🔌 Function

Seals a fluid or pressure joint by being squeezed into its groove, so the circuit holds pressure and stays free of contamination.

⚠️ Common Signs of Failure

• Fluid, air or pressure leakage develops at the joint
• The O-ring is flattened, cut, brittle, swollen or heat-damaged
• The seal extrudes from its groove or twists during assembly
• Contamination enters the sealed circuit
• Replacement is required whenever the joint is dismantled and the seal cannot be reused

🛠️ Service Notes

• Supersedes 20459974 - order the current number
• Inspect the groove and the spigot for scoring before fitting, and lubricate the ring so it seats without twisting

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20459904 → Supersedes 20459974

📦 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