Mercury 40 HP 4-Stroke EFI Outboard 2016–2020 Service Repair Manual – PDF Download

🛠️ Mercury 40 HP 3-Cylinder EFI 4-Stroke Outboard 2016–2020 Service Repair Manual – PDF Download

🧰 OEM Mercury Factory Service Manual — Covers 30 HP and 40 HP EFI 3-Cylinder 4-Stroke outboards (Serial No. 1C453840 and above)
📲 Instant PDF Download — fully compatible with Windows, macOS, iOS, Android, and Linux
🔧 Used by authorized Mercury technicians and marine professionals worldwide

🔍 Model Background

The Mercury 40 HP EFI 4-Stroke (2016–2020) represents Mercury’s refined mid-range 3-cylinder platform, engineered for dependable, efficient performance in a compact design. Powered by a 747 cc inline-3 SOHC engine, this model delivers exceptional fuel economy, quiet operation, and low vibration for fishing boats, inflatables, and utility craft alike.

Equipped with Electronic Fuel Injection (EFI), the engine ensures smooth starts, crisp throttle response, and excellent cold-start reliability. It features a lightweight design with a maintenance-free valvetrain, mechanical throttle linkage, and SmartCraft-compatible electronics on select models.

Designed to meet strict emission standards while providing years of trouble-free boating, the 3-cylinder 40 HP EFI 4-Stroke remains one of Mercury’s most trusted light-to-mid power outboards.

📆 Model Years Covered

• Mercury 40 HP EFI 3-Cylinder – 2016
• Mercury 40 HP EFI 3-Cylinder – 2017
• Mercury 40 HP EFI 3-Cylinder – 2018
• Mercury 40 HP EFI 3-Cylinder – 2019
• Mercury 40 HP EFI 3-Cylinder – 2020

📄 Manual Details

• Model Coverage: 30 HP & 40 HP EFI 3-Cylinder 4-Stroke (BigFoot & Standard versions)
• Serial Range: 1C453840 and Above
• Engine Type: Inline 3 SOHC – 747 cc (45.6 cu in)
• Fuel System: EFI (Sequential Electronic Fuel Injection)
• Ignition: CDI Electronic
• Cooling System: Water-cooled with thermostat
• Trim / Tilt: Power Trim & Tilt or Gas-Assist (depending on model)
• File Format: PDF (Digital Manual)
• Pages: 500 + pages of factory service procedures and color diagrams

📚 Manual Chapters Include

• Section 1 – Specifications & General Information
• Section 2 – Electrical System (ignition, charging, starting circuits)
• Section 3 – Fuel System (EFI diagnostics, pump service, injectors, pressure tests)
• Section 4 – Powerhead (cylinder head, camshaft, pistons, valve adjustment)
• Section 5 – Mid-Section / Trim System
• Section 6 – Gearcase & Driveshaft Housing (2:1 gear ratio EZ Shift)
• Section 7 – Control Linkage & Attachments
• Section 8 – Color Wiring Diagrams (full schematics and component locations)

💾 Format & Compatibility

• 📘 File Type: PDF (Digital Instant Download)
• 🔍 Searchable & Bookmarked for easy navigation
• 🖨️ Printable – print the entire manual or individual pages
• 💻 Works on: Windows, macOS, iOS, Android, Linux
• ⚡ Instant Delivery after purchase — no shipping required

🔍 Keywords

Mercury 30 40 HP EFI 3-Cylinder 4-Stroke service manual PDF, Mercury outboard repair manual 2016–2020, EFI fuel injection troubleshooting, color wiring diagrams, Mercury Marine PDF download

❓ Mini FAQ

Q: Is this an official Mercury Marine factory manual?
✅ Yes — this is the complete OEM service manual (90-8M0105569) used by Mercury technicians for the 3-cylinder 30 / 40 EFI 4-Stroke.

Q: Does this cover the 4-cylinder 40 HP version?
❌ No — this manual applies only to the 3-cylinder EFI models (747 cc). The 2018 4-cylinder 40 HP is a different engine family and requires another manual.

Q: Can I view this manual on my tablet or phone?
✅ Yes — the PDF is optimized for all devices and fully searchable for mobile use.

🧭 Helpful Resources for Mercury Owners

• Why Every Mercury Mariner Owner Needs a Service Manual for At-Home Repairs
• Outboard Engine Troubleshooter – Find causes for starting issues, rough idle, or overheating problems across Mercury outboards.

🔧 Browse More Mercury Manuals

Note: This manual is intended for owners and technicians with basic to moderate mechanical experience. If you’re uncertain about a procedure or your engine shows serious issues, consult a qualified Mercury Marine dealer for professional service.