2019 Mercury SeaPro™ 40 HP - 25 in. Shaft

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SeaPro™ 40 HP - 25 in. Shaft



Engineered for Commercial Duty

Season after season, these durable, easy-to-maintain SeaPro commercial motors deliver reliable starts and improved fuel efficiency. Calibrated to reach maximum torque at lower rpms, they provide more power with less stress on the motor. Get on plane faster – and stay there longer at lower speeds.

  • A compact, single-overhead-cam design and long piston stroke deliver more low-end torque for stout power, even when pushing a heavy load. For commercial fishing vessels, commercial workboats and law-enforcement boats.
  • Engineered for Commercial: Engineered to deliver longer engine life while maintaining the power and performance necessary to get the job done, the 60 and 40hp SeaPro FourStroke engines are validated to three times the engine life of a recreational engine.
  • Command Thrust Gearcase: The 60 and 40hp SeaPro FourStroke engines come standard with the Command Thrust gearcase. Its larger torpedo, combined with a bigger-diameter prop, can lift a heavy boat onto plane more easily and hold it there at lower speeds without impacting top speed.
  • Corrosion Resistance: Mercury’s proprietary formula – XK360, is an extremely low copper content aluminium alloy, which leads the industry in corrosion resistance. This makes costly corrosion failures and high labour bills a thing of the past. Most competitors use alloys with 2% to 4% copper content which will corrode faster than our MercAlloy, XK360 or A356 alloys.
  • Repower with SeaPro: The compact size also means older boats not initially designed for the weight of heavier four-stroke outboards can now be repowered and reborn to perform at their best with the latest technology.
  • HP / kW: 40 / 30
  • Engine type: 8-valve single overhead cam (SOHC); Inline 4
  • Displacement (CID/CC): 60.8 / 995
  • Air induction: Performance-Tuned Scroll Intake Manifold
  • Fuel induction system: Computer Controlled Multi-Port Electronic Fuel Injection (EFI)
  • Alternator amp / Watt: 18 amp / 226 watt
  • Recommended fuel: Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum
  • Recommended oil: NMMA Certified FCW SAE 25W-40
  • Engine protection operator warning system: SmartCraft Engine Guardian
  • Starting: Electric (turn-key)
  • Controls: Mechanical throttle & shift
  • Steering: Big Tiller; Remote
  • Shaft length: 25" / 635 mm
  • Gearcase ratio: 2.33:1
  • Dry weight *Lightest model available: 260 lbs / 118 kg
  • Bore and stroke: 2.56 x 2.95" / 65 x 75 mm
  • Ignition: SmartCraft ECM 07 Digital Inductive
  • Cooling system: Water-cooled with thermostat
  • Gearcase options: Command Thrust (CT)
  • Trim system: Gas Assist available; Power Tilt; Power Trim
  • Exhaust system: Through prop
  • Lubrication system: Wet sump
  • Oil Capacity: 3.0 qts / 2.8 l
Dry Weight based on lightest model available.



Engine Type
8-valve single overhead cam (SOHC); Inline 4
Bore x Stroke
2.56 x 2.95 in. (65 x 75 mm)
60.8 cid (995cc)
Electric (turn-key)


Shaft Length
25 in. (635 mm)
260 lb. (118 kg)


Trim Method
Gas Assist available; Power Tilt; Power Trim
Propshaft Horsepower
40 hp (30 kW)
Gear Ratio / Shift
Fuel Induction
Computer Controlled Multi-Port Electronic Fuel Injection (EFI)
18 amp / 226 watt
Water-cooled with thermostat
Big Tiller; Remote

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