20405829 Cap | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta service cap fitted to air cleaner 20405837 on the TD720GE Stage 1 / Tier 1 engine. It closes the housing around filter insert 3840034.

🚤 Compatibility

Typically suits:

• Volvo Penta TD720GE
• Volvo Penta TD520VE
• Volvo Penta TAD720GE
• Volvo Penta TAD520VE

• Engine Family: TD, TAD

⚙️ Key Features

• Air-cleaner housing end cap
• Confirmed specifically for TD720GE
• Used with filter insert 3840034
• Works with dust ejector 20405839
• Must seal and latch securely
• Engine type: Volvo Penta 7-litre industrial diesel

🔌 Function

Closes the air-cleaner housing and retains the filter insert against its sealing surface.

⚠️ Common Signs of Failure

• Dust entry around the cap
• Broken or loose latch
• Cracked or distorted cap
• Filter element movement
• Poor sealing to the cleaner body

🛠️ 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 Supersession Chain

• 20405829 → Supersedes 21056447

OEM / Related Numbers

• 21056447 earlier number superseded by this part
• 20405837 - complete air cleaner
• 3840034 - filter insert, related earlier number 20405830
• 20405839 - dust ejector
• 20405833 - mounting bracket

📦 Condition

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