20412590 Cap | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta cap fitted within the early four-cylinder valve-cover oil-filler neck. It is used with valve cover 20412587 and external filler cap 20412589.

🚤 Compatibility

Typically suits:

• Volvo Penta D5A-B TA
• Volvo Penta D5A-T
• Volvo Penta D5A-TA
• Volvo Penta TD520GE
• Volvo Penta TD520VE
• Volvo Penta TAD620VE
• Volvo Penta TAD650VE
• Volvo Penta TAD660VE
• Volvo Penta TAD520GE
• Volvo Penta TAD520VE
• Volvo Penta TAD530GE MECH
• Volvo Penta TAD530GE EDC4
• Volvo Penta TAD531GE MECH
• Volvo Penta TAD531GE EDC4
• Volvo Penta TAD532GE EDC4
• Volvo Penta MD2010
• Volvo Penta MD2010B

• Engine Family: D, TD, TAD, MD

⚙️ Key Features

• Internal filler-neck cap / closure
• Only used with the early four-cylinder valve-cover arrangement
• Works with filler cap 20412589
• Maintains the correct oil-fill neck geometry
• Not used with the later valve-cover design unless specifically listed
• Engine type: Volvo Penta 5-litre four-cylinder diesel

🔌 Function

Forms the internal closure and seat within the early valve-cover oil-filler neck.

⚠️ Common Signs of Failure

• Cap missing from the filler neck
• Oil mist leakage
• External filler cap not seating correctly
• Cracked or distorted cap
• Contamination entering the valve cover

🛠️ Service Notes

• Clean and inspect the seating face on the housing as well as the cap — most leaks past a cap are the seat or the seal rather than the cap body
• Renew any separate O-ring or gasket that goes with the cap, and lubricate rubber seals lightly with clean oil or grease so they slide home instead of rolling or tearing
• Do not over-tighten a cap into a plastic or aluminium housing; it seals on its gasket or O-ring, not on force, and stripped threads mean a much bigger repair
• Where a cap blanks a port during a repair, keep it fitted right up to the moment of assembly so nothing enters the opening
• Check the cap is fully home and that any retaining clip, lanyard or locking tab is secure before returning the boat to service

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 20412587 - early valve cover
• 20412589 - external filler cap
• 20412588 - early plane gasket
• 20725337 - later cover and gasket
• 20725315 - later cover and gasket

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging