804083001 Mercury Cover | Genuine Used Part

🔧 Product Description

Genuine Mercury Four-Stroke Cylinder Block Cover - Part Number: 804083001

A genuine Mercury cylinder-block and crankcase cover for selected Yamaha-manufactured 75HP to 115HP four-stroke outboards.

The cover closes a service opening in the cylinder block and protects the associated internal passage from contamination and leakage.

⚙️ Key Features

• Genuine Mercury four-stroke engine cover
• Correct current part number 804083001
• Supersedes original part number 804083
• Used on Yamaha-platform Mercury inline-four engines
• Factory alloy construction and mounting dimensions

🚤 Compatibility

Commonly used on

• Mercury Yamaha-built inline-four cylinder blocks

Typically suits

• Engine models:
• Mercury 75HP EFI four-stroke - serial 1B172291 to 1B366822
• Mercury 80HP EFI four-stroke - serial 1B227000 to 1B366822
• Mercury 90HP EFI four-stroke - serial 1B172291 to 1B366822
• Mercury 100HP EFI four-stroke - serial 1B227000 to 1B366822
• Mercury 115HP EFI four-stroke - serial 0T178500 through 1B366822
• Earlier carburetted 75HP and 90HP four-strokes using 804083001
• HP Range: 75HP - 115HP
• Engine Type: Yamaha-manufactured Mercury inline-four four-stroke outboard
• Year Range: Approximately 2000-2006

🔌 Function

The cover seals the applicable cylinder-block opening and protects the enclosed oil, cooling or crankcase passage from external contamination.

⚠️ Common Signs of Failure

• Oil or cooling-water leakage around the cover
• Cover is cracked or corroded
• Sealing surface is warped
• Mounting threads are damaged
• Gasket no longer seals correctly

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 804083001 → Supersedes 804083
• 804083 earlier OEM cover reference

OEM / Related Numbers

• 804083001
• 804083
• 745061271821
• Related cylinder-block gasket
• Related crankcase mounting bolts

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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