Suzuki DF70A Specifications
| Engine Model: Suzuki DF70A |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 91.6 cu.in (1.5 L) |
| Rated Engine Power: 70 Hp (51.5 kW) at 5500 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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The Suzuki DF70A is a technologically advanced
70 Hp outboard that delivers an impressive combination of power,
efficiency, and user-friendly features. Its offset driveshaft design
positions the powerhead closer to the front, moving the outboard's
center of gravity forward for improved weight distribution, reduced
vibration, and more stable steering performance.
The Lean Burn Control System optimizes the air-fuel mixture based on
operating conditions, providing significant improvements in fuel economy
across all speed ranges, especially at cruising speeds.
With the largest reduction gear ratio in its class at 2.59:1, the DF70A
delivers powerful torque for quick acceleration and excellent top-end
speed. Features like the Suzuki Keyless Start System with immobilizer,
tilt limit protection, and optional Troll Mode System make this outboard
a refined choice for boaters seeking reliability and performance.
Engine Model: Suzuki DF70A
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: 75.0 mm x 85.0 mm (2.95 in x 3.35 in)
Piston Displacement: 1502 cc (91.6 cu. in)
Maximum Output: 51.5 kW (70 Hp)
Full Throttle Operating Range: 5000-6000 rpm
Idle Speed: 600 ± 50 rpm
Fuel Delivery System: Multi-Point Sequential Electronic Fuel Injection
with Lean Burn Control
Alternator: 12V 27A
Steering: Remote (Tiller Kit Optional)
Trim Method: Power Trim and Tilt
Gear Ratio: 2.59:1 with 2-Stage Gear Reduction
Gear Shift: F-N-R (Forward-Neutral-Reverse)
Exhaust: Through Prop Hub Exhaust
Propeller Selection: 13"-25" pitch range, various 3-blade aluminum
propellers available
Starting System: Electric with Suzuki Easy Start System and Keyless
Start
Ignition System: Fully-transistorized
Engine Lubrication: Wet sump by trochoid pump
Engine Oil Capacity: 4.3 L (4.5/3.8 US/Imp. qt.) with filter change; 4.0
L (4.2/3.5 US/Imp. qt.) without filter change
Gear Oil Capacity: 0.85 L (28.7/30.0 US/Imp. oz.)
Compression Ratio: 9.5:1
Spark Plug: NGK DCPR6E
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): 0.30-0.34 mm (0.012-0.013 in) (cold)
Fuel Type: Alcohol-free unleaded gasoline
Minimum Fuel Octane Rating: 87 (Research method)
The DF70A is built upon a robust inline four-cylinder block with a
displacement of 1502 cc. The bore and stroke measure 75.0 mm and 85.0 mm
respectively, providing a square design that contributes to smooth power
delivery. The powerhead features a DOHC 16-valve configuration for
optimal airflow and combustion efficiency.
A key feature is the self-adjusting oil-bathed timing chain, which runs
in an oil bath so it never needs lubrication and is equipped with an
automatic hydraulic tensioner that keeps it properly adjusted at all
times. This design offers higher durability compared to belt-type
systems and is completely maintenance-free.
The offset driveshaft design positions the crankshaft in front of the
driveshaft, moving the outboard's center of gravity forward. This
configuration results in reduced vibration, a more compact engine
footprint, and more stable steering performance.
Cylinder bore std: 75.000-75.020 mm (2.9598-2.9535 in)
Piston skirt diameter std: 74.970-74.990 mm (2.9516-2.9524 in)
Piston to cylinder clearance std: 0.020-0.040 mm (0.0008-0.0016 in)
Piston ring end gap std: 0.30-0.45 mm (0.0118-0.0177 in)
Valve diameter (Intake): 27.5 mm (1.08 in)
Valve diameter (Exhaust): 22.9 mm (0.90 in)
Valve guide inside diameter: 5.500-5.512 mm (0.2165-0.2170 in)
The DF70A's fuel system is centered around the Suzuki Lean Burn Control
System, an intelligent technology that supplies the right fuel and air
mixture depending on navigation conditions. By predicting fuel needs
based on operating conditions and delivering an optimized air-fuel
mixture, this system provides significant improvements in fuel economy
across all speed ranges, especially 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
Suzuki Easy Start System allows the operator to simply turn and release
the key, with the starter remaining engaged until the engine starts.
This system also features more precise cylinder detection, fuel
injection, and ignition control for smoother starts and better
combustion.
The DF70A employs a wet sump lubrication system with a trochoid pump to
ensure consistent pressurized oil delivery to all critical engine
components. The engine has an oil capacity of 4.3 liters when changing
the filter, and 4.0 liters for oil-only changes.
Recommended engine oil includes 4-stroke motor oil meeting NMMA FC-W
certification or API classification SG, SH, SJ, SL, SM, with viscosity
SAE 10W-40 or 10W-30. An oil change reminder system helps track service
intervals.
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. For post-operation maintenance, the DF70A is
equipped with dual engine flush ports that make flushing the cooling
system much easier.
With one port located on the port side of the down housing and a second
on the front panel, access is convenient whether the boat is in or out
of the water. The thermostat should be inspected periodically according
to the maintenance schedule.
| 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 and high propulsive efficiency.
The lower gear case utilizes a hydrodynamic design that reduces drag as
the lower unit moves through the water, contributing to faster
acceleration and increased speed. Drive line impact protection is
provided by a spline drive rubber hub. Exhaust gases are channeled
through the propeller hub for quieter operation.
The Power Trim and Tilt system provides hydraulic control over the
outboard's angle, allowing the operator to adjust boat trim for optimal
performance, fuel efficiency, and ride comfort. The trim angle range is
0-20 degrees (-6 to 14 degrees), and the maximum tilt angle is 75
degrees (-6 to 69 degrees).
The Tilt Limit System incorporates a user-adjustable tilt limit switch
that prevents the outboard from tilting beyond a predetermined point,
protecting both the engine and the boat from damage caused by excessive
tilting.
The DF70A is designed to work with a range of propellers to match
various boat types and load conditions. The recommended propeller pitch
selection ranges from 13 inches to 25 inches, with all propellers being
three-blade type.
Available propeller options include various
diameters and pitches:
3 x 14 x 13
3 x 13-7/8 x 15
3 x 13-3/4 x 17
3 x 13-3/4 x 19
3 x 13-3/4 x 21
3 x 13-3/4 x 23
3 x 13-1/2 x 15
3 x 14 x 17
3 x 14 x 19
3 x 14 x 21
3 x 14 x 23
Transom Height (Long Shaft - L): 508 mm (20 in)
Transom Height (Extra Long Shaft - X): 635 mm (25 in)
Overall Length (front to back): 725 mm (28.5 in)
Overall Width (side to side): 460 mm (18.1 in)
Overall Height (Long Shaft): 1480 mm (58.2 in)
Overall Height (Extra Long Shaft): 1605 mm (63.3 in)
Dry Weight (Long Shaft): 156 kg (343 lbs)
Dry Weight (Extra Long Shaft): 160 kg (353 lbs)
Engine Mounting: Shear Mount system
Initial Service: Perform at 20 hours or 1 month.
Engine Oil: Replace every 100 hours or 12 months.
Engine Oil Filter: Replace initially at 20 hours, then every 200 hours
or 12 months.
Gear Oil: Replace every 100 hours or 12 months.
Spark Plugs: Inspect every 100 hours or 12 months.
Valve Clearance: Inspect every 300 hours or 36 months.
Water Pump Impeller: Inspect every 200 hours and replace as needed.
Low Pressure Fuel Filter: Inspect every 100 hours; replace every 400
hours or 2 years.
Anodes (External): Inspect every 100 hours or 12 months.
Propeller Nut and Cotter Pin: Inspect every 100 hours.
Bolts and Nuts: Check tightness at each interval.
Engine Oil Capacity: 4.3 L (4.5 qt.) with filter change; 4.0 L (4.2 qt.)
without filter.
Recommended Oil: 4-stroke motor oil, NMMA FC-W oil, or API SG, SH, SJ,
SL, SM.
Oil Viscosity SAE 10W-40 or 10W-30.
Gear Oil Capacity: 0.85 L (28.7/30.0 US/Imp. oz.).
Recommended Oil: Suzuki Outboard Motor Gear Oil or API GL5, SAE 90
Hypoid gear oil.
Drain/Fill Plug Torque: 10-15 Nm (7.4-11 lb-ft) with new gaskets.
Standard Plug: NGK DCPR6E (resistor type only).
Spark Plugs Gap: 0.8-0.9 mm (0.031-0.035 in)
Cylinder head bolt (8 mm): 23 Nm (16.6 lb-ft)
Cylinder head bolt (10 mm): 70 Nm (51.0 lb-ft)
Cylinder head cover bolt: 11 Nm (8.0 lb-ft)
Crankcase bolt (Outside): 25 Nm (18.0 lb-ft)
Crankcase bolt (Inside): 52 Nm (37.5 lb-ft)
Conrod cap bolt: 47 Nm (40.0 lb-ft)
Camshaft housing bolt: 11 Nm (8.0 lb-ft)
Oil pump bolt: 15 Nm (11.0 lb-ft)
Chain tensioner adjuster bolt: 11 Nm (8.0 lb-ft)
Timing chain guide bolt: 23 Nm (16.6 lb-ft)
Intake manifold bolt / nut: 23 Nm (16.5 lb-ft)
Fuel delivery pipe bolt: 23 Nm (16.5 lb-ft)
Low pressure fuel pump bolt: 10 Nm (7.0 lb-ft)
Flywheel bolt: 196 Nm (142.0 lb-ft)
Starter motor mounting bolt: 23 Nm (16.6 lb-ft)
Oil pressure switch: 13 Nm (9.5 lb-ft)
Thermostat cover bolt: 10 Nm (7.0 lb-ft)
Water pump case bolt: 17 Nm (12.3 lb-ft)
Power unit mounting bolt (8 mm): 23 Nm (16.5 lb-ft)
Power unit mounting bolt (10 mm): 50 Nm (36.0 lb-ft)
Driveshaft housing bolt: 50 Nm (36.0 lb-ft)
Lower mount bolt: 60 Nm (43.4 lb-ft)
Propeller shaft bearing housing bolt: 23 Nm (16.6 lb-ft)
Propeller nut: 55 Nm (40.0 lb-ft)
Spark Plugs: 18 Nm (13.0 lb-ft)
Drain Plug: 13 Nm (9.5 lb-ft)
Oil Filter: 14 Nm (10.0 lb-ft)
Fishing Boats: An excellent primary power source for small to mid-sized
fishing boats, bay boats, and side consoles, offering the torque needed
for quick planing and efficient trolling with the optional Troll Mode
System. Dinghies and Tenders: Suitable as a reliable power source for
larger dinghies and yacht tenders.
Lightweight Runabouts: Provides efficient power for small family
runabouts and skiffs used for cruising and water sports. Saltwater Use:
Extensively protected by the Suzuki Anti-Corrosion System, with features
like dual engine flush ports making it exceptionally well-suited for
long-term durability in harsh saltwater environments. The DF70A meets
applicable European exhaust and noise emission regulations.
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