882551 Mercruiser Lower Air Duct | Genuine Used Part

🔧 Product Description

Genuine MerCruiser 1.7L Diesel Lower Air Duct - Part Number: 882551

A genuine used lower intake-air duct for MerCruiser and Cummins MerCruiser 1.7L Isuzu-based diesel engines.

The duct forms the lower half of a two-piece air-routing assembly. It works with upper duct 882552 to direct intake air through the engine's air-cooler and intake-manifold system while isolating the airflow path from surrounding engine-bay heat. Mercury parts listings identify 882551 as the lower air duct.

⚙️ Key Features

• Genuine MerCruiser lower air duct
• Correct Mercury reference 882551
• Companion to upper duct 882552
• Factory-moulded for the 1.7L diesel intake system
• Mounts around the air-cooler and intake-manifold assembly

🚤 Compatibility

Commonly used on

• MerCruiser D1.7L DTI sterndrive engines
• Cummins MerCruiser CMD 1.7 MI inboard engines
• Isuzu-based MerCruiser 1.7L diesel intake systems

Typically suits

• Engine models:
• MerCruiser D1.7L DTI
• Cummins MerCruiser CMD 1.7 MI 120
• MerCruiser 1.7 MI 120
• MerCruiser 1.7 MS 120
• Engines whose intake-manifold or air-cooler diagram specifies 882551
• HP Range: Approximately 120HP
• Engine Type: 1.7L inline four-cylinder turbo-diesel
• Year Range: Approximately late-1990s through mid-2000s

🔌 Function

The duct channels incoming air through the intended cooler and intake path, helping the turbocharged engine receive a consistent supply of cooler, denser air.

⚠️ Common Signs of Failure

• Duct is cracked or split
• Intake air escapes before reaching the manifold
• Engine loses power under load
• Duct rattles against surrounding components
• Mounting brackets or pin are missing
• Hot engine-bay air is drawn into the intake
• Dirt or oil contamination collects inside the duct
• Duct does not seal against upper section 882552

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 882551 Mercury lower air-duct reference
• No verified later supersession

OEM / Related Numbers

• 882551 - lower air duct
• 882552 - upper air duct
• Mounting bracket: 882583
• Mounting brackets: 882609
• Retaining pin: 882728
• Flange screw: 882298
• Associated air cooler and intake-manifold components vary by serial range

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated