9003A2 Mercury Cylinder Block Cover | Genuine Used Part
9003A2 Mercury Cylinder Block Cover | Genuine Used Part
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🔧 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
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in the condition you received it for a refund or exchange. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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