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| Home / Outboard Engines / Suzuki Engines / Suzuki DF20AS |
Suzuki DF20AS Specifications
The Suzuki DF20AS is a four-stroke two-cylinder overhead cam gasoline short shaft outboard engine. This engine has a multi-point sequential electronic fuel injection, integral fuel pump, water cooled with thermostat, and capacitor discharge ignition system. A 20.1 cu.in (327 cc) outboard motor has a cylinder bore of 2.38" (60.4 mm), piston stroke of 2.24" (57 mm), and maximum power of 20 hp (14.7 kW) at 5300-6300 rpm. The boat motor is equipped with a manual or electric starting system, 3-blades aluminum standard propeller, manual or power trim and tilt, and tiller handle or remote control steering system. The fuel tank has a capacity of 3.2 gal (12 liters).
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| General Technical Data |
Engine Model ................ Suzuki DF20AS, DF20AES, DF20ARS, DF20ATS, DF20ATHS
Engine Type ................ 4-stroke two-cylinder OHC gasoline outboard engine
Number of Cylinders ................ 2
Displacement, cu.in (cc) ................ 20.1 (327)
Cylinder Bore, in (mm) ................ 2.38 (60.4)
Piston Stroke, in (mm) ................ 2.24 (57.0)
Maximum Engine Power, hp (kW) ................ 20.0 (14.7)
Maximum Engine Speed, rpm ................ 5300-6300
Idle Speed, rpm ................ 800-900
Lubrication System ................ Pressure with trochoid pump
Exhaust System ................ Through prop hub
Cooling System ................ Water-cooled
Ignition System ................ Digital CDI
Starting System ................ Recoil or electric
Choke System ................ Manual or electric
Electrical System Rating, Volts ................ 12
Charging System ................ Alternator
Alternator Rating, Amps ................ 6 or 12
Outboard Weight (Short Shaft with Recoil Starter), lbs (kg) ................ 97.0 (44.0)
Outboard Weight (Short Shaft with Electric Starter), lbs (kg) ................ 105.7 (48.0)
| Fuel System |
Fuel System Type ................ Multi-Point Sequential Electronic Fuel Injection
Fuel Pump Type ................ Integral
Fuel Type ................ Unleaded gasoline (91 octane minimum)
Fuel Tank Capacity, gal (L) ................ 3.2 (12.0)
| Gear Housing |
Gear Shift ................ F-N-R
Gear Ratio ................ 2.08:1
Gear Oil Capacity, qts (L) ................ 0.26 (0.25)
| Mid Section |
Trim System ................ Manual Trim and Tilt or Power Tilt
Transom Height (Short Shaft), in (mm) ................ 15 (381)
Steering System ................ Tiller Handle or Remote Control
| Propeller Information |
Diameter, in (mm) ................ 9.25 (235)
Pitch, in (mm) ................ 9 (228), 10 (254), 11 (280), 12 (304)
Number Of Blade ................ 3
Material ................ Aluminum
| Cylinder Block |
Cylinder Bore Inside Diameter, in (mm) ................ 2.3780-2.3785 (60.400-60.415)
Cylinder Bore (Max Out of Round), in (mm) ................ 0.002 (0.050)
Crank Pin Outside Diameter, in (mm) ................ 1.1413-1.1417 (28.989-29.000)
Crank Pin Width, in (mm) ................ 0.7913-0.7953 (20.100-20.200)
Crankshart Thrust Play, in (mm) ................ 0.024 (0.6)
Crankshart Runout (Maximum), in (mm) ................ 0.0016 (0.040)
Crankshaft Journal Outside Diameter, in (mm) ................ 1.2594-1.2598 (31.989-32.000)
Crankshaft Journal Oil Clearance, in (mm) ................ 0.0008-0.0019 (0.020-0.047)
Connecting Rod Inside Diameter (Big End), in (mm) ................ 1.1427-1.1431 (29.025-29.034)
Connecting Rod Oil Clearance (Big End), in (mm) ................ 0.0010-0.0018 (0.025-0.045)
Connecting Rod Side Clearance (Big End), in (mm) ................ 0.0039-0.0098 (0.100-0.250)
Connecting Rod Width (Big End), in (mm) ................ 0.7854-0.7874 (19.950-20.000)
Connecting Rod Inside Diameter (Small End), in (mm) ................ 0.6302-0.6304 (16.006-16.014)
Piston Skirt Diameter, in (mm) ................ 2.3766-2.3772 (60.365-60.380)
Piston to Cylinder Clearance, in (mm) ................ 0.0011-0.0017 (0.0271-0.0425)
Piston Pin Outside Diameter, in (mm) ................ 0.6297-0.6299 (15.995-16.000)
Piston Pin Bore Inside Diameter, in (mm) ................ 0.6300-0.6302 (16.002-16.008)
Piston to Piston Pin Clearance, in (mm) ................ 0.0001-0.0005 (0.002-0.013)
Top Ring Width, in (mm) ................ 0.040-0.041 (1.02-1.04)
Second Ring Width, in (mm) ................ 0.048-0.049 (1.21-1.23)
Oil Ring Width, in (mm) ................ 0.079-0.080 (2.01-2.03)
Top Ring End Gap, in (mm) ................ 0.0047-0.0098 (0.12-0.25)
Second Ring End Gap, in (mm) ................ 0.0102-0.0154 (0.26-0.39)
Top Ring Side Clearance, in (mm) ................ 0.0012-0.0028 (0.030-0.070)
Second Ring Side Clearance, in (mm) ................ 0.0008-0.0024 (0.02-0.06)
| Cylinder Head and Valves |
Cylinder Head Warp Limit ................ 0.002 (0.050)
Valve Head Thickness (Intake), in (mm) ................ 0.02 (0.50)
Valve Head Thickness (Exhaust), in (mm) ................ 0.02 (0.50)
Valve Stem Outside Diameter (Intake), in (mm) ................ 0.2156-0.2161 (5.475-5.490)
Valve Stem Outside Diameter (Exhaust), in (mm) ................ 0.2146-0.2152 (5.450-5.465)
Valve Guide Inside Diameter (Intake), in (mm) ................ 0.2165-0.2170 (5.500-5.512)
Valve Guide Inside Diameter (Exhaust), in (mm) ................ 0.2165-0.2170 (5.500-5.512)
Valve Stem To Valve Guide Clearance (Intake), in (mm) ................ 0.0004-0.0015 (0.010-0.037)
Valve Stem To Valve Guide Clearance (Exhaust), in (mm) ................ 0.0014-0.0024 (0.035-0.062)
Valve Seat Width (Intake), in (mm) ................ 0.035-0.043 (0.9-1.1)
Valve Seat Width (Exhaust), in (mm) ................ 0.035-0.043 (0.9-1.1)
Valve Spring Free Length, in (mm) ................ 1.31 (33.16)
Cam Height (Intake), in (mm) ................ 0.9335-0.9398 (23.710-23.870)
Cam Height (Exhaust), in (mm) ................ 0.9264-0.9327 (23.530-23.690)
Camshaft Journal Outside Diameter (Upper), in (mm) ................ 0.9826-0.9835 (24.959-24.980)
Camshaft Journal Outside Diameter (Lower), in (mm) ................ 0.9039-0.9047 (22.959-22.980)
Camshaft Journal Oil Clearance, in (mm) ................ 0.0008-0.0024 (0.020-0.062)
| Maintenance Data |
Engine Fuel Type ................ Unleaded 91 octane minimum
Engine Oil Type ................ SAE 10W-30, 10W-40
API Service Classifications ................ SG, SH, SJ, SL, SM, and SN
Engine Oil Capacity, qts (L) ................ 1.05 (1.00)
Gear Lubricant Type ................ Suzuki Outboard Motor Gear Oil or GL5 SAE 90
Gearcase Capacity, qts (L) ................ 0.26 (0.25)
Ignition Timing, degrees ................ 5-20 BTDC
Spark Plug Type ................ NGK MR6K-9
Spark Plug Gap, in (mm) ................ 0.031-0.035 (0.8-0.9)
Valve Lash (Intake), in (mm) ................ 0.006-0.008 (0.16-0.20)
Valve Lash (Exhaust), in (mm) ................ 0.006-0.008 (0.16-0.20)
| Service Intervals |
Check Battery ................ Every 100 hours
Change Engine Oil ................ Every 100 hours
Change Gear Oil ................ Every 100 hours
Check Spark Plug ................ Every 100 hours
Check Breather and Fuel Line ................ Every 100 hours
Check Low Pressure Fuel Filter ................ Every 100 hours
Check Anodes ................ Every 100 hours
Check Thermostat ................ Every 100 hours
Check Propeller Nut and Pin ................ Every 100 hours
Replace Oil Filter ................ Every 200 hours
Check Valve Lash ................ Every 200 hours
Check Timing Belt ................ Every 200 hours
Check Idle Speed ................ Every 200 hours
Check Water Pump ................ Every 200 hours
Check Water Pump Impeller ................ Every 200 hours
Replace Spark Plug ................ Every 300 hours
Replace Water Pump Impeller ................ Every 300 hours
Replace Timing Belt ................ Every 400 hours
Replace Fuel Filter ................ Every 400 hours
| Tightening Torques |
Side cover screw, Nm (lb-ft) ................ 5 (3.6)
Tiller handle bolt, Nm (lb-ft) ................ 23 (16.5)
Tiller handle bracket bolt, Nm (lb-ft) ................ 23 (16.5)
Steering friction adjuster nut, Nm (lb-ft) ................ 9 (6.5)
Throttle grip screw, Nm (lb-ft) ................ 3 (2.1)
Driveshaft housing bolt, Nm (lb-ft) ................ 23 (16.5)
Shallow drive arm bolt, Nm (lb-ft) ................ 25 (18.0)
Clamp bracket shaft nut, Nm (lb-ft) ................ 43 (31.0)
Propeller nut, Nm (lb-ft) ................ 18 (13.0)
Gearcase bolt, Nm (lb-ft) ................ 17 (12.3)
Water pump case nut, Nm (lb-ft) ................ 6 (4.3)
Bearing housing bolt, Nm (lb-ft) ................ 8 (5.8)
Cylinder head cover bolt, Nm (lb-ft) ................ 10 (7.2)
Throttle body, Nm (lb-ft) ................ 11 (8.0)
Intake manifold, Nm (lb-ft) ................ 23 (16.5)
Camshaft pulley bolt, Nm (lb-ft) ................ 10 (7.2)
Power unit mounting bolt, Nm (lb-ft) ................ 23 (16.5)
Flywheel nut, Nm (lb-ft) ................ 90 (65.0)
Cylinder head bolt (1st step), Nm (lb-ft) ................ 15 (11)
Cylinder head bolt (Final step), Nm (lb-ft) ................ 30 (21.7)
Conrod cap bolt, Nm (lb-ft) ................ 10 (7.2)
Timing pulley nut, Nm (lb-ft) ................ 50 (36.0)
Low pressure fuel pump bolt, Nm (lb-ft) ................ 10 (7.2)
Fuel delivery pipe bolt, Nm (lb-ft) ................ 11 (8.0)
Starter motor mounting bolt, Nm (lb-ft) ................ 23 (16.5)
Spark plug, Nm (lb-ft) ................ 10-12 (7.5-9.0)
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| Engines Technical Specifications |