21999539 Inlet Silencer | Genuine Volvo Penta Part

🔧 Product Description

Inlet silencer used in the mechanically assisted charge-air system on selected D11 marine engines. It reduces supercharger intake noise while maintaining the low-restriction airflow required during low-speed boost operation.

🚤 Compatibility

Typically suits:

• Volvo Penta D11C2-A MP
• Volvo Penta D11C4-A MP
• Volvo Penta D11B4-A MP
• Volvo Penta D11B2-A MP

• Engine Family: D

⚙️ Key Features

• Low-restriction intake airflow path
• Acoustic attenuation matched to the supercharger system
• Designed for the original air inlet and supports
• Resists vibration and intake pulsation
• Correct sealing prevents unfiltered-air entry

🔌 Function

Reduces intake and supercharger noise while directing clean air into the forced-induction system with minimal restriction.

⚠️ Common Signs of Failure

• Cracking or loose mounting
• Air leak or unfiltered-air entry
• Increased intake noise
• Restriction from contamination or internal collapse
• Chafe damage at adjoining pipework

🛠️ Service Notes

• At just over 9 kg, support the silencer while it is unbolted and refitted rather than letting it hang on the inlet ducting
• Fitted specifically to the mechanically-supercharged D11 (B2/B4/C2/C4) engines — confirm the exact engine suffix before ordering, since other D11 induction variants use a different inlet arrangement

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21145185 - supercharger
• 22003447 - air inlet
• 21308577 - gasket
• 21621971 - air outlet
• 21211439 - support bracket
• 21451746 - pipe
• 21832376 - hose
• 996675 - clamp
• 981021 - drive belt
• 21422765 - belt tensioner
• 21452524 - belt protector
• 22024624 - bracket
• 3887305 - idler
• 3818176 - hub

📦 Condition

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