9003A2 Mercury Cylinder Block Cover | Genuine Used Part

🔧 Product Description

Genuine Mercury Three-Cylinder Cylinder Block Cover Assembly - Part Number: 9003A2

A genuine used Mercury cylinder-block cover for selected 65 Jet, 75HP, 80HP and 90HP three-cylinder two-stroke outboards.

The cover seals the rear water-jacket section of the cylinder block and directs cooling water around the cylinders.

⚙️ Key Features

• Genuine used Mercury cylinder-block cover
• Correct assembly part number 1034-9003A2
• Supersedes earlier references 9003A1 and 9003T
• Fits selected three-cylinder two-stroke engines
• Original cast-aluminium cooling-jacket component

🚤 Compatibility

Commonly used on

• Mercury and Mariner inline three-cylinder cylinder blocks
• Cooling-water jacket cover assemblies

Typically suits

• Engine models:
• Mercury 65 Jet - USA serial 0D283222 through 0G760299
• Mercury 65 Jet - Belgium serial 9793577 through 0P016999
• Mercury / Mariner 75HP three-cylinder - USA serial 0D283222 through 0G760299
• Mercury / Mariner 75HP - Belgium serial 9793577 through 0P016999
• Mercury / Mariner 80HP three-cylinder - serial 0B240451 through 0C221999
• Mercury / Mariner 90HP three-cylinder - USA serial 0D283222 through 0G760299
• Mercury / Mariner 90HP - Belgium serial 9793577 through 0P016999
• HP Range: 65 Jet / 75HP / 80HP / 90HP
• Engine Type: Mercury / Mariner inline three-cylinder two-stroke outboard
• Year Range: Approximately late 1980s through the 1990s

🔌 Function

The cover seals the cylinder-block cooling-water cavity and directs water around the cylinder walls before it exits through the thermostat and exhaust cooling passages.

⚠️ Common Signs of Failure

• Cooling water leaks from the cover gasket
• Cover is warped or cracked
• Internal corrosion restricts water flow
• Mounting-bolt threads are damaged
• Engine overheats because cooling passages are blocked
• Salt deposits build up behind the cover

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 1034-9003A2 → Supersedes 9003A1
• 9003A1 → Supersedes 9003T
• 9003T earlier cylinder-block cover reference

OEM / Related Numbers

• 1034-9003A2
• 10349003A2
• 9003A2
• 9003A1
• 9003T
• Related cylinder-block cover gasket as specified by serial range
• 8947T55 related three-cylinder cylinder block

Aftermarket / Verified Equivalents

• Aftermarket cylinder-block cover gaskets are available for selected serial groups
• No aftermarket equivalent for the complete cover assembly

📦 Condition

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