Suzuki DF140BTL Specifications
| Engine Model: Suzuki DF140BTL |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 124.8 cu.in (2 L) |
| Rated Engine Power: 140 Hp (103 kW) at 6000 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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The Suzuki DF140BTL is a refined and
technologically advanced 140 Hp outboard that delivers a compelling
combination of performance, efficiency, and user-friendly features. The
increase in the compression ratio to 10.6:1 is a key advancement,
contributing to improved top speed, quicker acceleration, and enhanced
thermal efficiency compared to the previous DF140A model.
The engine is packed with features like the Suzuki Lean Burn Control
System, Variable Valve Timing, and a redesigned cowling with an advanced
air intake and resonator for ultra-quiet operation. With its emphasis on
reliability, ease of maintenance, and a host of thoughtful design
details, the DF140BTL is engineered to provide a premium and worry-free
boating experience.
Engine Model: Suzuki DF140BTL
Engine Type: 4-Stroke, DOHC (Double Overhead Camshaft), 16-Valve
Number of Cylinders: In-Line 4
Valve Train Drive: Self-adjusting oil-bathed timing chain with automatic
hydraulic tensioner
Bore and Stroke: 86.0 mm x 88.0 mm (3.39 in x 3.46 in)
Piston Displacement: 2045 cc (124.8 cu. in)
Maximum Output: 103.0 kW (140 Hp)
Full Throttle Operating Range: 5700-6300 rpm
Idle Speed: 700 ± 50 rpm
Fuel Delivery System: Multi-Point Sequential Electronic Fuel Injection
Alternator: 12V 40A
Steering: Remote
Trim Method: Power Trim and Tilt
Gear Ratio: 2.59:1 with 2-Stage Gear Reduction
Gear Shift: F-N-R (Forward-Neutral-Reverse)
Control System: Mechanical
Propeller Selection: 15"-25" pitch (Standard Rotation)
Starting System: Electric
Ignition System: Fully-transistorized
Engine Lubrication: Trochoid pump pressure lubrication
Engine Oil Capacity: 5.5 L (5.8/4.8 US/Imp. qt.)
Gear Oil Capacity: 1.05 L (1.11/0.92 US/Imp. qt.)
Spark Plug: NGK LKR6E
Spark Plug Gap: Standard: 0.8-0.9 mm (0.031-0.035 in)
Valve clearance (Intake): 0.23-0.27 mm (0.009-0.011 in) (cold)
Valve clearance (Exhaust): 0.33-0.37 mm (0.013-0.015 in) (cold)
Fuel Type: Alcohol-free unleaded gasoline
Minimum Fuel Octane Rating: 91 (Research method)
Compression Ratio: 10.6:1
The DF140BTL is built upon a robust inline four-cylinder block with a
displacement of 2045 cc. A key advancement for this model is the
increase in the compression ratio to 10.6:1. Through extensive
simulation and testing, engineers achieved this higher ratio, which is a
primary contributor to the engine's improved top speed, quicker
acceleration, and greater thermal efficiency, improving fuel efficiency
by 5 to 7 percent.
The powerhead features a DOHC 16-valve configuration for optimal airflow
and combustion efficiency. The valve train is driven by a self-adjusting
oil-bathed timing chain, which runs in an oil bath and is equipped with
an automatic hydraulic tensioner. This design renders the timing chain
maintenance-free for the life of the engine.
The Variable Valve Timing (VVT) system is hydraulically controlled by
oil pressure and automatically optimizes intake valve timing to deliver
strong, smooth torque and impressive acceleration across the entire
powerband. The offset driveshaft design positions the powerhead closer
to the front, moving the outboard's center of gravity forward. This
configuration results in reduced vibration, a more compact mounting
footprint, and more stable steering performance.
The DF140BTL's fuel system is centered around the Suzuki Lean Burn
Control System. This intelligent technology uses an O2 sensor feedback
loop to monitor engine operating conditions in real-time, predicting
fuel needs and delivering a precise, optimized air-fuel mixture. This
system provides significant improvements in fuel economy across all
speed ranges, most notably at cruising speeds.
The Multi-Point Sequential Electronic Fuel Injection system precisely
meters fuel to each cylinder for optimal combustion, ensuring crisp
throttle response, smooth acceleration, and reduced emissions. The
engine management system also incorporates a knock sensor to monitor
combustion, allowing the ECU to adjust timing for optimum performance
and to help increase engine durability. The redesigned cowling
incorporates a new air intake structure with improved water separation.
The DF140BTL employs a trochoid pump pressure lubrication system to
ensure consistent, pressurized oil delivery to all critical engine
components, including the crankshaft, connecting rods, and the valve
train with its VVT components. The engine has an oil capacity of 5.5
liters.
A new oil filter location and the addition of an oil spill catcher on
the filter mount are key maintenance-focused design improvements,
allowing for cleaner and easier oil changes by simply removing the top
cowling and preventing spillages. The hole for the oil level gauge has
been widened to 15mm to accommodate a larger oil change hose.
Engine temperature is managed by a reliable water-cooled system. A water
pump, located in the lower unit, draws water from the surrounding
environment and circulates it through water jackets in the cylinder
block and powerhead. The DF140B was the first four-stroke outboard to
utilize an oil cooler, ensuring consistent engine performance under all
operating conditions.
For post-operation maintenance, the Dual Engine Flush Port system allows
for easy connection of a garden hose to rinse salt, sand, and other
debris from the cooling passages, protecting the engine from corrosion.
The Suzuki Water Detecting System utilizes a water-detecting fuel filter
to alert the operator with both visual and audio warnings if water is
present in the fuel, thereby preventing issues like poor combustion,
power loss, and internal corrosion.
| Mid Section and Lower Unit |
The mid-section houses the offset driveshaft, contributing to the
forward center of gravity and overall compactness. The lower unit
features a robust gearcase with a 2.59:1 gear ratio, one of the largest
in its class, achieved through a 2-stage gear reduction system. This
system, enabled by the offset driveshaft, provides a first stage
reduction between the crankshaft and driveshaft and a second stage
reduction inside the gear case.
The higher gear ratio allows the engine to turn larger diameter
propellers, resulting in powerful torque for quick acceleration, high
propulsive efficiency, and the ability to maintain thrust even under
heavy loads.
With the optimization of the gear oil passage, the gear oil temperature
is lowered, cooling the gear which contributes to increasing the
durability of the pinion gear. Exhaust gases are channeled through the
propeller hub for quieter operation. A new silencer and resonator system
integrated into the design further reduces engine noise at all speeds.
The Power Trim and Tilt (PTT) system provides hydraulic control over the
outboard's angle, allowing the operator to adjust the boat's trim for
optimal performance, fuel efficiency, and ride comfort. The system
includes a Tilt Limit System, which features a user-adjustable tilt
limit switch that prevents the outboard from tilting beyond a
predetermined angle, thereby protecting both the engine and the boat
from damage that can be caused by excessive tilting.
The DF140BTL is designed to work with a range of propellers to match
various boat types and load conditions. The recommended propeller pitch
selection ranges from 15 inches to 25 inches for this standard rotation
model. All propellers are of the three-blade type.
Suzuki recommends an aluminum propeller for single-engine installations
and a stainless steel Watergrip propeller for twin-engine installations
to optimize performance. An optional Troll Mode System is available,
providing precise control over engine speed in low rpm ranges from idle
up to 1200 rpm in 50 rpm increments, ideal for trolling.
Transom Height (Long Shaft - L): 508 mm (20 in)
Dry Weight (Long Shaft - L): 186-188 kg (410-414 lbs)
Engine Mounting: Shear Mount system
Engine Oil Capacity: 5.5 L with filter.
Recommended Engine Oil: High-quality 4-stroke motor oil, NMMA FC-W
certified, SAE 10W-40 viscosity.
Gear Oil Capacity: 1.05 L.
Recommended Gear Oil: SAE 90 Hypoid gear oil, API GL-5.
Spark Plugs: NGK LKR6E.
Spark Plug Gap: Standard: 0.8-0.9 mm (0.031-0.035 in).
Valve Clearance (Intake): 0.23-0.27 mm (0.009-0.011 in) (cold); inspect
periodically.
Valve Clearance (Exhaust): 0.33-0.37 mm (0.013-0.015 in) (cold); inspect
periodically.
Water Pump Impeller: Inspect and replace as needed.
Anodes (external): Inspect periodically; replace when eroded.
Propeller Nut and Cotter Pin: Inspect and replace cotter pin as needed.
Battery: Minimum 100 Ah recommended.
Maintenance Features: The self-adjusting timing chain is
maintenance-free. The oil spill catcher prevents messes during oil
changes. The Suzuki Water Detecting System provides an alert for water
in the fuel.
Cylinder Head Bolts: 36 lb-ft (49 Nm)
Connecting Rod Bolts: 28 lb-ft (38 Nm)
Flywheel Nut: 22 lb-ft (30 Nm)
Spark Plugs: 18 lb-ft (24 Nm)
Engine Oil Drain Plug: 12 lb-ft (16 Nm), with a new gasket each time
Gear Oil Drain/Fill Screws: 12 lb-ft (16 Nm), with new gaskets each time
Propeller Nut: 26 lb-ft (35 Nm), must be secured with a new cotter pin
Fishing Boats: An excellent primary power source for bay boats, side
consoles, and center consoles in the 16 to 24-foot class, designed for
freshwater, inshore, and offshore fishing applications. Pontoon Boats
and Houseboats: A popular choice for powering pontoon boats and larger
houseboats, where its quiet, fuel-efficient operation enhances the
leisurely cruising experience.
Rigid Inflatable Boats (RIBs): Powers high-performance RIBs and sports
boats, with numerous boat brands featuring Suzuki power. Dual Console
and Bowrider Boats: Provides refined and efficient power for family
runabouts used for cruising, tubing, and water sports. Lightweight
Cruisers and Deck Boats: Suitable for smaller cabin cruisers and deck
boats where a balance of power, weight, and advanced features is
essential.
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