SPECIFICATIONS
ENGINE SPECIFICATIONS
Engine Model
4BY2-150 /
150Z
4BY2-180 /
180Z
6BY2-220 /
220Z
6BY2-260 /
260Z
Application Design
Models numbers with no suffix letter are used in marine gear applications. Mod-
els having a “Z” suffix are used with stern drive.
Number of Cylinders
In-line 4
In-line 6
Type
15° inclined, water-cooled, dual overhead camshaft, 4-cycle diesel
Combustion System
Direct injection
Aspiration
Turbocharged with charge air cooler
Bore x Stroke
84 mm x 90 mm (3.307 in. x 3.543 in.)
Displacement
1.995 L (122 cu in.)
2.993 L (183 cu in.)
Firing Order*
1-3-4-2
1-5-3-6-2-4
Compression Ratio
16.5:1
16.5:1
Maximum Output at Crankshaft**
kW (metric hp) at 4000
rpm
110 kW (150 hp)
132 kW (180 hp)
162 kW (220 hp)
191 kW (260 hp)
Mean Pressure
1.66 MPa
(240.8 psi)
1.95 MPa
(287.2 psi)
1.62 MPa
(234.96 psi)
1.92 MPa
(278.47 psi)
Torque
320 N·m
(236 ft-lb)
360 N·m
(265 ft-lb)
500 N·m
(369 ft-lb)
550 N·m
(407 ft-lb)
Low Idle Speed (Warm En-
gine @ 88°C [190°F])
750 rpm (ECU-controlled) ***
670 rpm (ECU-controlled) ***
Cold Start Speed @ 20˚
°C (68°F)
1200 rpm gradually decreasing to warm engine idle @ 88°C (190°F)
(ECU-controlled)
High Idle Speed
4600 rpm
Rotation Direction
Counterclockwise (viewed from flywheel)
No. of Valves per Cylinder
4
Valve Adjustment
Hydraulic self-adjusting
Turbocharger
MHI with pneumatic wastegate
HOLSET with pneumatic wastegate
Charge Air Cooler
Seawater cooled
Electrical System
12 V
Starter
12 V / 2 kW (2.7 hp)
Charging System
12 V / 150 A
Battery Capacity - Recom-
mended
12 V / 85 Ah / 680 CCA (cold cranking amps)
BY Series Operation Manual
71
© 2008 Yanmar Marine International