21999539 Inlet Silencer | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Supercharger Inlet Silencer - Part Number: 21999539

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.

⚙️ 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

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 21999539 (current listed OEM reference)

OEM / Related Numbers:

• 21999539

• 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

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• D11 mechanically assisted charge-air / IPS compressor system

Typically suits:

• Engine models:

• D11B2-A MP

• D11B4-A MP

• D11C2-A MP

• HP / Rating: Controlled by the complete engine or drive product number

• Engine / System Type: Inline six-cylinder turbocharged and supercharged marine diesel

• Year Range: Production-build controlled; confirm by product and serial number

• Serial / Specification Control: Confirm the D11 model suffix, supercharger installation and serial number. The silencer must match air inlet 22003447 and supercharger 21145185.

🔌 Function

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

Common signs of failure or wear:

• Cracking or loose mounting

• Air leak or unfiltered-air entry

• Increased intake noise

• Restriction from contamination or internal collapse

• Chafe damage at adjoining pipework

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging