8041271 Mercury Thermostat Cover | Genuine Used Part

🔧 Product Description

Genuine Mercury 75HP-115HP Four-Stroke Thermostat Cover - Part Number: 8041271

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

The cover retains and seals the thermostat within the cylinder-head cooling passage. Mercury 8041271 directly cross-references Yamaha cover numbers 68V-12413-00-9S and 68V-12413-00-1S.

⚙️ Key Features

• Genuine Mercury cooling-system cover
• Correct part number 8041271
• Yamaha cross-reference 68V-12413-00-9S / 68V-12413-00-1S
• Designed for Yamaha-built Mercury inline-four engines
• Retains the thermostat and sealing ring
• Factory alloy construction and mounting pattern

🚤 Compatibility

Documented Mercury applications include

• Mercury 75HP carburetted four-stroke - serial 0G960500-0T800999
• Mercury 75HP carburetted four-stroke - serial 0T801000-1B226999
• Mercury 75HP EFI four-stroke - serial 1B172291-1B366822
• Mercury 80HP EFI four-stroke - serial 1B227000-1B366822
• Mercury 90HP carburetted four-stroke - serial 0G960500-0T800999
• Mercury 90HP carburetted four-stroke - serial 0T801000-1B226999
• Mercury 90HP EFI four-stroke - serial 1B172291-1B366822
• Mercury 100HP EFI four-stroke - serial 1B227000-1B366822
• Mercury 115HP EFI four-stroke - serial 0T178500-0T800999
• Mercury 115HP EFI four-stroke - serial 0T801000-1B226999
• HP Range: 75HP - 115HP
• Engine Type: Yamaha-manufactured Mercury inline-four four-stroke outboard
• Fitment Requirement: Confirm the engine serial number before installation

🔌 Function

The cover secures the thermostat and seal within the cooling passage. The thermostat controls cooling-water circulation so the engine reaches and maintains its designed operating temperature.

⚠️ Common Signs of Failure

• Cooling water leaks around the cover
• Corrosion damages the internal sealing surface
• Cover is cracked or warped
• Mounting threads or bolt holes are damaged
• Thermostat cannot seat or seal correctly

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 8041271 original Mercury thermostat-cover reference
• Part is discontinued or no longer available in several Mercury catalogues
• Yamaha 68V-12413-00-9S and 68V-12413-00-1S are direct cross-brand cover references

OEM / Related Numbers

• Mercury 8041271
• Yamaha 68V-12413-00-9S
• Yamaha 68V-12413-00-1S
• Mercury 8556761 related thermostat
• Mercury 855676004 later related thermostat
• Yamaha 67F-12412-00-00 related thermostat seal

Aftermarket / Verified Equivalents

• Genuine Yamaha 68V-12413-00-9S
• Genuine Yamaha 68V-12413-00-1S
• Specialist used Mercury / Yamaha thermostat cover
• Aftermarket thermostat and sealing-ring service components
• No verified direct non-OEM cover casting

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated
• Replace the thermostat seal before installation where applicable