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
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