General Specifications
HP / kW
40 HP / 29.8 kW
Displacement
747 cc (45.6 cu in.)
Cylinders
3 (Inline)
WOT RPM
5500 - 6000
Weight
93 kg / 205 lbs
Drive & Lower Unit
Gear Ratio
2.00:1
Shaft Length
20
Electrical System
Alternator Output 226 Watts
Starting System Electric
Technical Maintenance Toolkit
Verified service specifications for the Mercury 40hp FourStroke EFI (2024)
Lubrication
Engine Oil
Mercury FourStroke Oil 10W-30
Oil Capacity 3 Liters
Gearcase Lube 440 ml
Ignition System
Spark Plug
NGK RA8HC
Gap Setting 0.040"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 5500-6000
Alternator 226W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Mercury 40hp FourStroke EFI is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the Mercury 40hp FourStroke EFI:
Model Evolution
History of the Mercury 40HP series over the years:
Category Discovery
Reference Data
Information compiled from Mercury Marine factory service manuals and original sales literature published in 2024.