Mercury 400 V10 Verado Specifications
| Engine Model: Mercury Verado 400 V10 |
| Engine Type: 4-stroke 10-cylinder DOHC 40-valve gasoline outboard engine |
| Total Displacement: 349 cu.in (5.7 L) |
| Rated Engine Power: 400 Hp (298 kW) at 6400 rpm |
| Fuel System: Electronic fuel injection (EFI) |
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The Mercury 400 V10 Verado is defined by its
unique and potent foundation: a massive 5.7-liter V10 powerhead. This
substantial displacement generates immense, naturally aspirated torque,
providing instantaneous throttle response and the ability to
effortlessly propel heavy boats onto plane. In testing, this power
translated to performance advantages, with Mercury reporting the 400hp
model accelerating three seconds faster from 0 to 30 mph than a 450hp
competitor on a heavy 26-foot center console.
This formidable power is delivered with a level of civility that
redefines expectations. Through its Advanced MidSection (AMS) and
meticulous sound engineering, the V10 is remarkably quiet, with Mercury
claiming it is 22 percent quieter at cruise than a leading competitor.
This seamless integration of brute force and refined manners is the
hallmark of the V10 Verado. It is fully equipped with SmartCraft
technology, including Digital Throttle and Shift (DTS),
electro-hydraulic power steering, and features like Adaptive Speed
Control, which collectively deliver an effortless and precise driving
experience that instills confidence in any condition.
Engine Type: V10 with a 64-degree bank angle, 4-stroke.
Valvetrain: Dual Overhead Camshafts (DOHC) with 40 valves (20 per bank).
Displacement: 5.7 Liters (349 Cubic Inches).
Bore and Stroke: 92 mm by 86 mm (dimensions derived from 5.7L
architecture consistent with the V10 family).
Power Output: 400 Hp at the propeller shaft (298 kW).
Full Throttle Operating Range: 5800-6400 RPM.
Fuel Induction System: Computer-controlled Electronic Fuel Injection
(EFI) with Advanced Range Optimization (ARO) for enhanced fuel
efficiency.
Induction System: Naturally aspirated.
Alternator Output: A high-output 150-amp alternator generates 1890 W,
providing substantial electrical power for modern onboard electronics
and battery charging.
Recommended Fuel: Unleaded Regular 87 Octane (minimum), making it
practical for extended voyages. Some sources note 91 RON for
international markets.
Engine Protection: The SmartCraft Engine Guardian system monitors
critical sensors and can automatically reduce power to prevent damage
from adverse operating conditions.
Starting System: Electric Start with SmartStart Protection, which
prevents starter motor engagement if the engine is already running.
Steering: Electro-hydraulic power steering is standard, with Joystick
Piloting for Outboards compatibility. Optional Electric Steering may be
available.
Trim System: Power trim and tilt.
The robust foundation of the Verado 400 V10 is central to its
performance and durability.
Cylinder Block: The engine is constructed around a massive 5.7-liter V10
block, an industry first for outboards. This 64-degree V10 architecture,
with its substantial displacement, is the primary source of the engine's
immense torque output, allowing it to work effortlessly under heavy
loads without a supercharger. Mercury engineers utilized advanced
computational fluid dynamics to optimize the block's design, allowing
for material removal without affecting strength or reliability, thus
managing weight effectively. The bore and stroke are configured at 92 mm
by 86 mm.
Cylinder Heads and Valvetrain: The engine features advanced cylinder
heads with Dual Overhead Camshafts (DOHC) operating a total of 40
valves. This configuration optimizes airflow into and out of the
combustion chambers, contributing significantly to the engine's power
output and efficiency across the entire RPM range.
The fuel system is designed for both responsive performance and
optimized efficiency. It utilizes a computer-controlled closed-loop
Electronic Fuel Injection (EFI) system for precise fuel metering under
all conditions.
A key feature is Advanced Range Optimization (ARO), a proprietary
calibration that seamlessly adjusts the fuel delivery during cruise
speeds to maximize fuel economy without any noticeable change in engine
operation, effectively extending the boat's range. The system is
calibrated to deliver full performance on readily available 87-octane
fuel.
The engine is equipped with a reliable integrated wet sump lubrication
system. Routine maintenance is simplified by the Verado family's
industry-exclusive top cowl service door, allowing for effortless oil
level checks and top-ups without removing the engine cover. An
electronic oil sensor can automatically verify the oil level and notify
the operator on a connected multi-function display.
Cooling is managed by a robust water-cooled system that draws in ambient
water. A thermostat regulates the engine's operating temperature for
optimal performance, fuel efficiency, and longevity. The system also
includes a freshwater flushing provision for easy maintenance after
operation in salt or brackish water. Exhaust gases are expelled through
the propeller hub, contributing to the quiet operation.
| Mid Section and Lower Unit |
Advanced MidSection (AMS): This signature Verado feature is a
sophisticated mounting system that cradles the powerhead on perimeter
mounts, moving the engine mounts outward and aft. This design isolates
the powerhead from the transom, dramatically reducing vibration and
noise transmission to the boat's hull for an exceptionally smooth and
quiet ride. Mercury claims this results in an engine that is 22 percent
quieter at cruise than a leading competitor.
Gearcase and Ratio: The V10 features an all-new, precision hydrodynamic
gearcase, larger and longer than previous units, with a diameter of 6.4
inches. It is designed to maximize lift and quickly bring large, heavy
boats onto plane. It is equipped with a deep 2.08:1 gear ratio to
optimize low-end torque and acceleration.
Exhaust: The exhaust system features dual exhaust tuning for advanced
sound control. An industry-exclusive Advanced Sound Control feature
allows the operator to toggle between a whisper-quiet exhaust tone or a
throatier growl at startup and idle. The primary exhaust is routed
through the propeller hub, contributing to noise reduction.
The Verado 400 V10 is equipped with a powerful electro-hydraulic power
trim and tilt system. This system allows the operator to precisely
adjust the engine angle for optimal boat performance, handling, and
shallow water operation. It is fully integrated with the boat's digital
controls.
Propeller selection is crucial for matching the engine's power to the
specific boat and its intended use. The Verado 400 V10 is designed to
work with Mercury's new Revolution X propeller, which features a larger
diameter and wider blades to complement the new gearcase and deep gear
ratio for better handling and acceleration. The correct propeller must
allow the engine to operate within its 5800-6400 RPM full-throttle
range.
Revolution X propellers are available in a range of pitches, from 18 to
33 inches, to accommodate various boat weights and applications. Mercury
dealers and resources like the Mercury Propeller Selector guide are used
to determine the optimal propeller for a given setup.
Shaft Length Options:
20 inches (508 mm).
25 inches (635 mm).
30 inches (762 mm).
35 inches (889 mm).
Dry Weight (Lightest Model): The lightest configuration of the Verado
400 V10 has a dry weight of 695 lbs (316 kg). This represents a
significant weight advantage over competitors, being 254 lbs lighter
than a comparable 450hp engine in XL models.
Every 100 hours:
Change engine oil and replace the oil filter.
Check the outboard for tightness to the boat transom.
Inspect thermostat visually for corrosion and/or for a broken spring.
Check engine water separating fuel filter for contaminants.
Clean and/or replace filter.
Drain and replace gearcase lubricant.
Check power steering fluid.
Inspect battery.
Check wiring and connectors.
Every 300 hours:
Replace water pump impeller.
Check power trim fluid.
Replace high‑pressure in‑line fuel filter.
Replace spark plugs.
Replace accessory drive belt.
Propeller Nut: 55 lb-ft (75 Nm).
Powerhead Mounting Bolts: 20-25 ft-lb (27-34 Nm).
Lower Unit/Gearcase Bolts: 15-20 ft-lb (20-27 Nm).
Spark Plugs: 13-15 ft-lb (18-20 Nm).
Water Pump Cover Bolts: 8-12 ft-lb (11-16 Nm).
The versatility and refined power of the Mercury Verado 400 V10 make it
suitable for a wide array of demanding boat types, performing admirably
in both single and multi-engine configurations. Offshore Fishing Boats:
Provides the immense torque and reliability needed for running to
distant grounds in large center consoles and the smooth operation
desired by serious anglers.
Luxury Center Consoles and Dual Consoles: A perfect match for larger,
high-end boats, delivering exhilarating performance and quiet,
comfortable cruising for families and enthusiasts. Cruisers and
Performance Boats: The substantial displacement delivers the torque
required to efficiently propel heavier, beamier hulls.
Multi-Engine Installations: Commonly used in twin, triple, quad, or even
quint configurations on larger offshore vessels, sport-fishing rigs, and
catamarans. These setups benefit from joystick piloting compatibility,
allowing for intuitive maneuvering and station-holding capabilities. The
26-inch center spacing is specifically designed for this purpose.
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