Suzuki DF30ATL Specifications
| Engine Model: Suzuki DF30ATL |
| Engine Type: 4-stroke 3-cylinder long shaft gasoline outboard engine |
| Total Displacement: 29.9 cu.in (490 cc) |
| Rated Engine Power: 30 Hp (22.1 kW) at 6300 rpm |
| Fuel System: Electronic fuel injection |
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The Suzuki DF30ATL and DF30ATHL are
four-stroke, three-cylinder outboard engines featuring a Single Overhead
Camshaft (SOHC) design with four valves per cylinder. The engine
displacement measures 29.9 cubic inches or 490 cc, achieved through a
cylinder bore of 2.38 inches (60.4 mm) and a piston stroke of 2.24
inches (57.0 mm). The powerhead produces a maximum output of 30.0 Hp,
equivalent to 22.1 kW.
The engine is designed to operate within a wide-open throttle range of
5300 to 6300 rpm, maintaining a stable idle speed of 850 rpm, plus or
minus 50. The compression ratio is specified at 10.0:1. Lubrication is
managed by a trochoid-type, cam-driven oil pump operating within a wet
sump configuration.
The engine utilizes a water-cooled system with an open-loop design,
incorporating a thermostat for temperature regulation, and expels
exhaust through the propeller hub. Ignition is handled by a digital
Capacitor Discharge Ignition (CDI) system. Starting is facilitated by a
push-button electric start with a manual recoil backup system. The
electrical system operates on a 12-volt basis, with charging provided by
a 14-amp alternator.
The foundation of the DF30ATL and DF30ATHL engines is its cylinder
block, machined to precise tolerances. The cylinder bore inside diameter
is specified at 2.3780 to 2.3785 inches, or 60.400 to 60.415 mm, with a
maximum allowable out-of-round measurement of 0.002 inch (0.050 mm). The
rotating assembly is built around a crankshaft with a maximum runout
limit of 0.0016 inch (0.040 mm). Crankshaft journal outside diameter
measures 1.2594 to 1.2598 inches (31.986 to 32.000 mm), maintaining an
oil clearance of 0.0008 to 0.0020 inch (0.020 to 0.051 mm).
Crank pin outside diameter is 1.1413 to 1.1417 inches (28.989 to 29.000
mm) with a width of 0.7913 to 0.7953 inch (20.100 to 20.200 mm).
Connecting rods feature a big end inside diameter of 1.1427 to 1.1431
inches (29.025 to 29.034 mm), resulting in an oil clearance of 0.0010 to
0.0019 inch (0.025 to 0.049 mm). The connecting rod side clearance at
the big end is 0.0039 to 0.0098 inch (0.100 to 0.250 mm), with a rod
width of 0.7854 to 0.7874 inch (19.950 to 20.000 mm). The small end
inside diameter measures 0.6302 to 0.6304 inch (16.006 to 16.014 mm).
Pistons are manufactured with a skirt diameter of 2.3766 to 2.3772
inches (60.365 to 60.380 mm), establishing a piston-to-cylinder
clearance of 0.0011 to 0.0017 inch (0.0271 to 0.0425 mm). The piston pin
outside diameter is 0.6297 to 0.6299 inch (15.995 to 16.000 mm), fitting
into a piston pin bore of 0.6300 to 0.6302 inch (16.002 to 16.008 mm)
with a clearance of 0.0001 to 0.0005 inch (0.002 to 0.013 mm).
The piston ring set includes a top ring with a width of 0.040 to 0.041
inch (1.02 to 1.04 mm) and an end gap of 0.0047 to 0.0098 inch (0.12 to
0.25 mm). The second ring measures 0.048 to 0.049 inch (1.21 to 1.23 mm)
in width with an end gap of 0.0102 to 0.0154 inch (0.26 to 0.39 mm). The
oil ring width is 0.079 to 0.080 inch (2.01 to 2.03 mm). Side clearance
for the top ring is 0.0012 to 0.0028 inch (0.030 to 0.070 mm), while the
second ring operates with a side clearance of 0.0008 to 0.0024 inch
(0.02 to 0.06 mm).
The cylinder head assembly incorporates the valvetrain and must remain
within a warp limit of 0.002 inch (0.050 mm). The intake valves feature
a head diameter of 1.14 inches (29.0 mm) with a minimum head thickness
of 0.02 inch (0.50 mm). Exhaust valves have a head diameter of 1.02
inches (26.0 mm) with an identical head thickness specification.
Intake valve stem outside diameter measures 0.1959 to 0.1965 inch (4.975
to 4.990 mm), while exhaust valve stems are slightly smaller at 0.1950
to 0.1957 inch (4.955 to 4.970 mm). Both intake and exhaust valve guides
share an inside diameter of 0.1969 to 0.1973 inch (5.000 to 5.012 mm).
This results in a stem-to-guide clearance of 0.0004 to 0.0015 inch
(0.010 to 0.037 mm) for intake valves and 0.0012 to 0.0022 inch (0.030
to 0.057 mm) for exhaust valves.
Valve seat width is consistent for both intake and exhaust at 0.035 to
0.043 inch (0.9 to 1.1 mm). The valve springs have a free length of 1.35
inches (34.29 mm). Camshaft profiles are ground to specific heights,
with intake lobes measuring 1.0012 to 1.0035 inches (25.430 to 25.490
mm) and exhaust lobes measuring 0.9898 to 0.9921 inch (25.140 to 25.200
mm).
Camshaft journal outside diameters are specified at 1.0614 to 1.0622
inches (26.959 to 26.980 mm) for the upper journal, 1.3563 to 1.3573
inches (34.450 to 34.475 mm) for the center journal, and 0.9039 to
0.9047 inch (22.959 to 22.980 mm) for the lower journal. The oil
clearance for these journals ranges from 0.0008 to 0.0024 inch (0.020 to
0.062 mm).
The DF30ATL and DF30ATHL employ a battery-less electronic fuel injection
system, utilizing components redesigned from larger outboards to fit the
compact powerhead. This system integrates with Suzuki's Lean Burn
Control technology, which continuously monitors operating conditions to
deliver the optimal air-fuel mixture for combustion efficiency,
providing significant fuel savings across all speed ranges.
The integral fuel pump draws from a standard 6.6-gallon or 25-liter
external remote fuel tank included with the motor. The engine is
designed to run on unleaded gasoline with a minimum octane rating of 87.
Engine lubrication is maintained through a wet sump system pressurized
by a trochoid-type, cam-driven oil pump. The system requires 1.58 US
quarts or 1.50 liters of engine oil meeting API service classifications
SG, SH, SJ, SL, or SM.
Recommended viscosity grades include SAE 10W-30 and 10W-40 for normal
operating conditions. A low oil pressure caution system alerts the
operator to unsafe operating conditions.
Cooling is accomplished through a positive displacement water pump that
draws water from the lower unit in an open-loop configuration. The
system incorporates a thermostat to regulate engine operating
temperature, ensuring efficient combustion and durability.
A freshwater flushing system is integrated into the design, allowing
easy connection of a garden hose for rinsing the cooling passages after
operation in salt or brackish water, simplifying maintenance procedures.
| Mid Section and Lower Unit |
The mid section houses the driveshaft and provides the structural
connection between the powerhead and the lower unit using shear mount
engine mounting. The exhaust system is designed to route gases through
the propeller hub for quieter operation.
The lower unit contains the bevel gear reduction system with a ratio of
2.09:1, representing one of the largest reduction gear ratios in its
class, contributing to powerful torque for rapid acceleration and strong
pulling capability.
The gearcase holds 0.35 US quart or 0.33 liter of gear lubricant, which
must meet GL5 SAE 90 specifications. The gear shift mechanism provides
forward, neutral, and reverse functions.
Both the DF30ATL and DF30ATHL feature a hydraulic power trim and tilt
system, operated by a remote switch or tiller handle-mounted control for
effortless adjustment. The trim angle range extends from zero to sixteen
degrees, while maximum tilt angle reaches sixty-nine degrees. Five tilt
pin positions are available for setting the optimal trim angle.
The DF30ATL and DF30ATHL are equipped with a three-bladed aluminum
propeller as standard equipment. The propeller diameter measures 10.25
inches or 260 mm. A range of pitch options from 9 to 15 inches (228 to
381 mm) allows fine-tuning for specific applications, with a 12-inch
pitch propeller commonly supplied. Propeller selection depends on boat
type, load, and intended use to achieve optimal engine performance
within the recommended full-throttle operating range.
The DF30ATL and DF30ATHL are long shaft configurations with a transom
height of 20 inches or 508 mm. Overall width measures 15.5 inches or
395.0 mm. Overall height is 53.4 inches or 1355.0 mm for both models.
Overall length varies by model, with the DF30ATL measuring 26.5 inches
(673.0 mm) and the DF30ATHL measuring 27.4 inches (695.0 mm). Weight
varies based on equipment level. The DF30ATL remote steering model
weighs 161.0 lbs (73.0 kg). The DF30ATHL tiller steering model weighs
165.0 lbs (75.0 kg).
Routine maintenance ensures reliable operation and longevity for the
DF30ATL and DF30ATHL. Engine oil capacity is 1.58 US quarts or 1.50
liters. Gearcase capacity is 0.35 US quart or 0.33 liter. Ignition
timing is set at 7 to 25 degrees Before Top Dead Center. The specified
spark plug is NGK CPR6EA-9, with a gap setting of 0.031 to 0.035 inch,
or 0.8 to 0.9 mm.
Valve lash adjustment requires intake valve clearance of 0.007 to 0.009
inch (0.18 to 0.22 mm) and exhaust valve clearance of 0.008 to 0.009
inch (0.20 to 0.24 mm). A comprehensive maintenance schedule guides
service intervals. Every 100 hours of operation, inspections should
include battery condition, spark plug, breather and fuel line integrity,
low pressure fuel filter, anodes, thermostat function, and propeller nut
and pin security, along with engine and gear oil changes.
At 200-hour intervals, tasks expand to include replacement of the oil
filter, checking valve lash, inspecting the timing belt and water pump,
verifying idle speed, and examining the air cleaner element. Spark plug
replacement and water pump impeller replacement occur every 300 hours.
The fuel filter should be replaced every 400 hours, with low pressure
pump filter checks at 1000-hour intervals.
Critical torque specifications include the cylinder head bolts at 30 Nm
or 21.7 lb-ft. Crankcase bolts inside the assembly require 28 Nm (21.0
lb-ft), while outside crankcase bolts are torqued to 11 Nm (8.0 lb-ft).
Connecting rod cap bolts are tightened to 10 Nm (7.2 lb-ft). The
flywheel nut demands 100 Nm (75.5 lb-ft). Camshaft pulley bolts receive
30 Nm (22.0 lb-ft) and crankshaft timing pulley nuts 50 Nm (36.0 lb-ft).
Rocker arm shaft bolts are set at 6 Nm (4.4 lb-ft) with valve adjusting
screw lock nuts at 10 Nm (8.0 lb-ft). Intake manifold bolts and nuts
require 23 Nm (16.5 lb-ft). The oil pressure regulator tightens to 27 Nm
(19.5 lb-ft). Throttle body and low pressure fuel pump bolts are both
set at 11 Nm (8.0 lb-ft). Starter motor mounting bolts take 23 Nm (16.5
lb-ft). Oil pump bolts are torqued to 11 Nm (8.0 lb-ft).
The engine oil filter requires 14 Nm (10.5 lb-ft). Water pump case nuts
are tightened to 6 Nm (4.3 lb-ft). Power unit mounting bolts, driveshaft
housing bolts, gearcase bolts, and tiller handle bolts all share a
specification of 23 Nm (16.5 lb-ft). The propeller nut is torqued to 25
Nm (18.0 lb-ft). Spark plugs are installed at 10 to 12 Nm or 7.5 to 9.0
lb-ft.
The versatility of the DF30ATL and DF30ATHL makes them suitable for a
wide range of watercraft. Their compact dimensions and light weight
benefit smaller vessels such as tenders, rigid inflatable boats, and
dinghies where portability and storage are considerations. The power
output and torque characteristics suit larger fishing boats, console
boats, and sport boats up to approximately six meters in length.
For heavier applications such as fully equipped fishing boats or light
commercial workboats, these models provide reliable propulsion. The
DF30ATHL with tiller steering and 360-degree rotating handle offers
exceptional maneuverability for navigating tight spaces, making it ideal
for bass boats and jon boats where precise control is required. The
DF30ATL with remote steering integrates seamlessly with center console
and dual console boat designs, allowing for clean helm installations.
Both models feature Suzuki's advanced corrosion-resistant technology,
ensuring durability and long-lasting performance in saltwater
environments.
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