Isuzu Diesel Engines	Isuzu L Series Engines	Isuzu J Series Engines	Isuzu B Series Engines
Isuzu Diesel Engines	Isuzu S Series Engines	Isuzu H Series Engines	Isuzu W Series Engines

Isuzu L Series Engines

Introduction

3LB1, 3LD1, 4LE1, 4LE2

Engine Model 3LB1 3LD1 4LE1 4LE2

Engine Characteristics 4 Cycle, Water Cooled, Vertical In-Line

Valvetrain Configuration Overhead Valve

Type of Aspiration Naturally Aspirated

Type of Injection Indirect Direct

Number of Cylinders 3 3 4 4

Bore x Stroke 3.05 x 3.14 in
(77.4mm x 79.7mm) 3.27 x 3.62 in
(83.1mm x 92mm) 3.35 x 3.78 in
(85 mm x 96 mm) 3.35 x 3.78 in
(85mm x 96mm)

Displacement 68.6 cu in (1.12 liter) 91.3 cu in (1.49 liter) 133 cu in (2.2 liter) 133 cu in (2.2 liter)

Compression Ratio 22:1 22:1 21.5:1 18.8:1

Overall Dimensions

Length 21.1" (537mm) 22.5" (571.5mm) 29.4" (747mm) 25.7" (654mm)

Width 17.2" (475mm) 17.2" (475mm) 19.8" (503mm) 19.2" (488mm)

Height 20.8" (553mm) 24" (609mm) 23.7" (602mm) 23.7" (602mm)

Dry Weight 271 lbs (123 kg) 291 lbs (132 kg) 389 lbs (176 kg) 299 lbs (135.5 kg)

Industrial Rating

Intermittent 25.4 HP @ 3000 RPM 33.3 HP @ 3000 RPM 54 HP @ 3000 RPM Rated Output:
52.4 HP @ 3000 RPM

Continuous 22.4 HP @ 3000 RPM 29.3 HP @ 3000 RPM 47.7 HP @ 3000 RPM

Maximum Torque 51.9 lb-ft @ 1800 RPM 70.3 lb-ft @ 1800 RPM 106 lb-ft @ 1800 RPM 105 lb-ft @ 2250 RPM

Performace Curve

Isuzu 3LB1 Isuzu 3LD1

A - 51.9 LB-FT INTERMITTENT
B - 45.7 LB-FT CONTINUOUS
C - 25.4 BHP INTERMITTENT
D - 22.4 BHP CONTINUOUS

Isuzu diesel 3LB1

Rated within 5% at ambient conditions of:
Temperature: 77° F (25° C)
Pressure: 29.31 "Hg (99kPa) DRY
Fuel Specific Gravity: 0.825
NOTE: Muffler & Air Cleaner not installed

A - 70.3 LB-FT INTERMITTENT
B - 61.9 LB-FT CONTINUOUS
C - 33.3 BHP INTERMITTENT
D - 29.3 BHP CONTINUOUS

Isuzu diesel 3LD1

Rated within 5% at ambient conditions of:
Temperature: 77° F (25° C)
Pressure: 29.31 "Hg (99kPa) DRY
Fuel Specific Gravity: 0.825
NOTE: Muffler & Air Cleaner not installed

Isuzu 4LE1

A - 106 LB-FT INTERMITTENT
B - 94 LB-FT CONTINUOUS
C - 46.4 BHP INTERMITTENT (4LE1PW01)
D - 41.0 BHP CONTINUOUS (4LE1PW01)
E - 54.0 BHP INTERMITTENT (4LE1PW03)
F - 47.7 BHP CONTINUOUS (4LE1PW03)

Isuzu diesel 4LE1

Rated within 5% at ambient conditions of:
Temperature: 77° F (25° C)
Pressure: 29.31 "Hg (99kPa) DRY
Fuel Specific Gravity: 0.825
NOTE: Muffler & Air Cleaner not installed

Engine Model	3LB1	3LD1	4LE1	4LE2
Engine Characteristics	4 Cycle, Water Cooled, Vertical In-Line
Valvetrain Configuration	Overhead Valve
Type of Aspiration	Naturally Aspirated
Type of Injection	Indirect			Direct
Number of Cylinders	3	3	4	4
Bore x Stroke	3.05 x 3.14 in (77.4mm x 79.7mm)	3.27 x 3.62 in (83.1mm x 92mm)	3.35 x 3.78 in (85 mm x 96 mm)	3.35 x 3.78 in (85mm x 96mm)
Displacement	68.6 cu in (1.12 liter)	91.3 cu in (1.49 liter)	133 cu in (2.2 liter)	133 cu in (2.2 liter)
Compression Ratio	22:1	22:1	21.5:1	18.8:1
Overall Dimensions
Length	21.1" (537mm)	22.5" (571.5mm)	29.4" (747mm)	25.7" (654mm)
Width	17.2" (475mm)	17.2" (475mm)	19.8" (503mm)	19.2" (488mm)
Height	20.8" (553mm)	24" (609mm)	23.7" (602mm)	23.7" (602mm)
Dry Weight	271 lbs (123 kg)	291 lbs (132 kg)	389 lbs (176 kg)	299 lbs (135.5 kg)

Industrial Rating
Intermittent	25.4 HP @ 3000 RPM	33.3 HP @ 3000 RPM	54 HP @ 3000 RPM	Rated Output: 52.4 HP @ 3000 RPM
Continuous	22.4 HP @ 3000 RPM	29.3 HP @ 3000 RPM	47.7 HP @ 3000 RPM	Rated Output: 52.4 HP @ 3000 RPM
Maximum Torque	51.9 lb-ft @ 1800 RPM	70.3 lb-ft @ 1800 RPM	106 lb-ft @ 1800 RPM	105 lb-ft @ 2250 RPM