878587A1 Mercury Bottom Cowling (Port) | Genuine Used Part
878587A1 Mercury Bottom Cowling (Port) | Genuine Used Part
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🔧 Product Description
Genuine Mercury Port Lower Cowling Assembly - Part Number: 878587A1
A genuine Mercury and Mariner port-side lower engine cowling for selected 75HP to 115HP four-stroke outboards.
The cover forms the port half of the lower cowling beneath the removable top cover. It protects the lower powerhead, wiring, fuel-system components and engine rigging while joining the matching starboard cover to complete the lower engine enclosure.
Part number 878587A1 has been replaced by current Mercury lower-cowling reference 8M0107315.
⚙️ Key Features
- Genuine Mercury / Mariner port lower cowling
- Correct original part number 878587A1
- Superseded by current Mercury part number 8M0107315
- Used on selected Yamaha-based Mercury four-stroke outboards
- Matches the corresponding starboard lower-cowling assembly
🚤 Compatibility
Commonly used on
- Mercury and Mariner Yamaha-based four-stroke lower-cowling assemblies
- Port-side engine-pan applications using split lower covers
Typically suits
- Engine models:
- Mercury / Mariner 75HP FourStroke - serial 0G960500 to 0T800999
- Mercury / Mariner 75HP FourStroke - serial 0T801000 to 1B226999
- Mercury 80HP EFI FourStroke - serial 1B227000 to 1B366822
- Mercury / Mariner 90HP FourStroke - serial 0G960500 to 0T800999
- Mercury / Mariner 90HP FourStroke - serial 0T801000 to 1B226999
- Mercury 100HP EFI FourStroke - serial 1B227000 to 1B366822
- Mercury / Mariner 115HP EFI FourStroke - serial 0T178500 to 0T800999
- Mercury / Mariner 115HP EFI FourStroke - serial 0T801000 to 1B226999
- Mercury / Mariner 115HP EFI FourStroke - serial 1B227000 to 1B366822
- HP Range: 75HP - 115HP
- Engine Type: Mercury / Mariner inline four-cylinder EFI four-stroke outboard
- Year Range: Approximately 2000 - 2006
🔌 Function
The port lower cowling encloses the port side of the lower powerhead and provides the mounting and sealing surfaces required for the complete engine-cover assembly.
⚠️ Common Signs of Failure
- Cracks around mounting screws or latch points
- Broken mating edge between the lower covers
- Distortion prevents the top cowling from sealing correctly
- Damaged seal channel allows water into the engine compartment
- Missing mounting points cause vibration or movement
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 8M0107315 → Supersedes 878587A1
- 878587A1 earlier Mercury port lower-cowling reference
OEM / Related Numbers
- 8M0107315
- 878587A1
- 878587
- 8M0113913 matching current starboard lower cowling
- 858743A2 earlier starboard lower cowling
- 8M0039078 related lower-cowling grommet
- 859251 earlier grommet reference
- 8M0109217 related lower-cowling seal
- 8253181 earlier lower-cowling seal reference
Aftermarket / Verified Equivalents
- No aftermarket equivalent
📦 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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