862083 Mercruiser Pulley Assy | Genuine Used Part

🔧 Product Description

Genuine MerCruiser Serpentine Idler Pulley Adjustment Assembly - Part Number: 862083

A genuine used MerCruiser idler-pulley and adjustment assembly for selected GM-based petrol marine engines.

The assembly guides and tensions the serpentine accessory belt, maintaining correct belt contact around the alternator, circulating-water pump, power-steering pump and crankshaft pulleys.

⚙️ Key Features

• Genuine used MerCruiser OEM idler assembly
• Original part number 862083
• Related service reference 862083T
• Works with current pulley reference 807757T
• Used in MerCruiser serpentine accessory-drive systems

🚤 Compatibility

Commonly used on

• MerCruiser GM V6 and small-block V8 serpentine-belt systems
• Accessory drives equipped with alternator, water pump and power steering

Typically suits

• Engine models:
• MerCruiser 4.3L V6
• MerCruiser 4.3L EFI
• MerCruiser 4.3L MPI
• MerCruiser 5.0L carburetted V8
• MerCruiser 5.0L EFI V8
• MerCruiser 5.0L MPI V8
• MerCruiser 5.7L V8
• MerCruiser 350 MAG
• MerCruiser 350 MAG MPI
• MerCruiser 350 MAG Horizon
• MerCruiser 6.2L MPI
• MerCruiser 377 MAG MPI
• Engine Type: MerCruiser GM V6 and small-block V8 petrol sterndrive / inboard
• Year Range: Approximately mid-1990s through the 2000s
• System Type: Serpentine-belt idler and adjustment assembly

🔌 Function

The assembly guides the serpentine belt and allows belt tension to be set so all front-engine accessories are driven without slipping.

⚠️ Common Signs of Failure

• Idler bearing produces a rumbling or squealing noise
• Pulley has side-to-side movement
• Serpentine belt runs off-centre
• Belt tension cannot be maintained
• Pulley surface is damaged or heavily worn
• Adjustment bracket is bent or seized

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 807757T later idler-pulley service reference
• 862083T later adjustment-bracket service reference
• 862083 earlier pulley and adjustment assembly reference

OEM / Related Numbers

• 862083
• 862083T
• 807757T
• 807757
• 862055 related alternator bracket
• 862056 related accessory bracket

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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