858752001 Mercury Cover | Genuine Used Part

🔧 Product Description

Genuine Mercury Four-Stroke Cylinder Head / Thermostat Cover - Part Number: 858752001

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

The cover is fitted to the cylinder-head assembly and protects the applicable cooling or thermostat passage.

⚙️ Key Features

• Genuine Mercury cylinder-head cover
• Current part number 858752001
• Supersedes original reference 858752
• Fits Yamaha-platform Mercury four-strokes
• Factory alloy cover with correct sealing and mounting dimensions

🚤 Compatibility

Commonly used on

• Mercury Yamaha-built inline-four cylinder-head assemblies

Typically suits

• Engine models:
• Mercury 75HP carburetted four-stroke
• Mercury 75HP EFI four-stroke
• Mercury 80HP EFI four-stroke
• Mercury 90HP carburetted four-stroke
• Mercury 90HP EFI four-stroke
• Mercury 100HP EFI four-stroke
• Mercury 115HP EFI four-stroke
• Serial ranges 0G960500 through 1B366822, dependent on horsepower
• 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-head cooling passage and protects the thermostat or internal water-jacket section.

⚠️ Common Signs of Failure

• Cooling-water leakage around the cover
• Corrosion damages the sealing surface
• Cover is cracked or warped
• Mounting threads are stripped
• Thermostat or cooling passage cannot seal correctly

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 858752001 → Supersedes 858752
• 858752 earlier OEM cover reference

OEM / Related Numbers

• 858752001
• 858752
• 745061443174
• Related cylinder-head gasket or seal
• Related thermostat and cooling-system hardware

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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