8M0119313 858743A2 Mercury Bottom Cowl STB | Genuine Used Part

🔧 Product Description

Genuine Mercury Starboard Lower Cowling Assembly - Part Number: 8M0113913

A genuine Mercury and Mariner starboard-side lower engine cowling for selected 75HP to 115HP four-stroke outboards.

The cover forms the starboard half of the lower cowling beneath the removable top cover. It protects the lower powerhead and rigging area and joins the matching port cover to complete the engine enclosure.

Current part number 8M0113913 supersedes earlier starboard lower-cowling assembly 858743A2.

⚙️ Key Features

• Genuine Mercury / Mariner starboard lower cowling
• Correct current part number 8M0113913
• Supersedes Mercury part number 858743A2
• Used on selected Yamaha-based Mercury four-stroke outboards
• Matches port lower cowling 878587A1 / 8M0107315

🚤 Compatibility

Commonly used on

• Mercury and Mariner Yamaha-based four-stroke lower-cowling assemblies
• Starboard-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 starboard lower cowling encloses the starboard 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

• 8M0113913 → Supersedes 858743A2
• 858743A2 earlier Mercury starboard lower-cowling reference

OEM / Related Numbers

• 8M0113913
• 858743A2
• 858743
• 878587A1 matching earlier port lower cowling
• 8M0107315 current port lower cowling
• 8M0039078 related lower-cowling grommet
• 859251 earlier grommet reference
• 8M0109217 related cowling seal
• 8253181 earlier cowling seal

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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