20405904 Ring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta ring used in the cylinder-block oil-pressure regulating valve assembly on TAD530GE and TAD531GE engines. It retains or seals the delivery valve, regulating valve, spring and sleeve components in their correct position.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

• Precision retaining / sealing ring for the oil-control valve
• Used with delivery valve 11700271
• Works with valve 20405936, spring 20405896 and sleeve 20405937
• Maintains the assembled valve-stack position
• Should be replaced if distorted or damaged during removal
• Engine type: Volvo Penta 5-litre four-cylinder industrial diesel

🔌 Function

Retains and seals the oil-pressure regulating components within the cylinder-block bore.

⚠️ Common Signs of Failure

• Ring distorted or no longer retaining the valve stack
• Oil-pressure control components moving in the bore
• Oil leakage around the valve plug
• Scoring or fretting at the ring groove
• Damage found during valve overhaul

🛠️ Service Notes

• Renew rather than reuse: rings of this kind seal or retain by being sprung or compressed into place and take a permanent set once fitted
• Clean the groove, register or bore the ring sits in and remove any burr or old sealing residue before fitting — debris in the groove stops a ring seating and is a common cause of a repeat leak
• Open or compress the ring only as far as it needs to go on; overstretching or twisting it during fitting distorts it permanently
• Check the ring is fully seated all the way round its groove or register, and the right way round where its faces differ, before closing the assembly up

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 11700271 - delivery valve
• 20405936 - regulating valve
• 20405896 - compression spring
• 20405937 - valve sleeve
• 20412745 - cap plug

📦 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