881313T1 Mercury Rocker Cover | Genuine Used Part

🔧 Product Description

Genuine Mercury 75HP-115HP Four-Stroke Cylinder-Head Cover Kit - Part Number: 881313T1

A genuine used Mercury cylinder-head or rocker-cover kit for Yamaha-manufactured Mercury and Mariner 75HP, 90HP and 115HP four-stroke outboards. The cover encloses the valve train and includes the engine-specific breather, oil-fill and gasket interfaces used on the early four-cylinder platform.

⚙️ Key Features

• Genuine Mercury Marine cylinder-head cover kit
• Correct part number 881313T1
• Used on 75HP, 90HP and 115HP four-strokes
• Yamaha-manufactured Mercury engine platform
• Factory oil-fill and crankcase-breather arrangement

🚤 Compatibility

Commonly used on

• Mercury and Mariner 75 FourStroke
• Mercury and Mariner 90 FourStroke
• Mercury and Mariner 115 EFI FourStroke
• Early Yamaha-manufactured four-cylinder powerhead family

Typically suits

• 75 / 90 FourStroke serial 0T801000 through 1B226999
• Earlier related 75 / 90 serial group beginning around 0G960500
• 115 EFI FourStroke serial 0T178500 through 1B226999
• Selected 115 EFI serial 1B227000 through 1B366822 after diagram confirmation
• Typical model years approximately 2000-2006
• HP Range: 75HP - 115HP
• Engine Type: Yamaha-manufactured inline-four EFI four-stroke
• Year Range: Approximately 2000-2006
• Mercury Part: 881313T1
• Fitment Requirement: Verify serial-specific gasket, breather cover and oil-plug arrangement

🔌 Function

The cover seals the camshaft and valve-train area, retains lubricating oil and routes crankcase vapours through the breather system.

⚠️ Common Signs of Failure

• Oil leakage around the cover gasket
• Cracked cover or bolt boss
• Blocked breather
• Damaged oil-plug assembly
• Warped sealing surface

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 881313T1 established Mercury cover-kit reference
• No confirmed direct Mercury supersession
• Later Mercury-designed 75HP-115HP four-stroke engines use different covers

OEM / Related Numbers

• 881313T1
• 881313
• 27-804123 related cover gasket
• 804119 breather cover
• 10-804120 breather-cover screw
• 859578A1 oil-plug assembly
• 25-855690 grommet
• 10-881312 cover bolt

Aftermarket / Verified Equivalents

• No verified separate Yamaha complete-cover number for a guaranteed direct swap
• Used genuine Mercury 881313T1 covers
• Aftermarket 804123-pattern gasket and grommet components where verified
• Used Yamaha-platform donor covers only after matching every breather, bolt and oil-fill feature
• No universal automotive rocker cover is compatible

📦 Condition

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