Isuzu 3CE1 Specifications
| Engine Model: Isuzu 3CE1 |
| Engine Type: 4-stroke in-line 3-cylinder liquid-cooled diesel |
| Total Displacement: 97.6 cu.in (1.64 L) |
| Rated Engine Power: 36.1 Hp (26.9 kW) at 3000 rpm |
| Fuel System Type: Direct injection |
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The Isuzu 3CE1 is a compact, naturally
aspirated diesel engine from Isuzu's renowned industrial engine family.
This vertical, water-cooled, three-cylinder power unit is engineered for
applications demanding high reliability, low emissions, and simple
mechanical operation. The 3CE1 utilizes a direct injection combustion
system, a feature that distinguishes it from older indirect injection
designs by providing improved fuel efficiency, easier cold starting, and
lower exhaust emissions.
With a displacement of 1.642 liters, this engine is positioned for light
to medium-duty industrial roles, including aerial work platforms, small
generator sets, skid-steer loaders, and agricultural auxiliary power
units. The engine meets stringent emissions standards, including US EPA
Tier 4 Final and EU Stage V, through internal combustion optimization
without requiring a diesel particulate filter or selective catalytic
reduction in most configurations. Its design philosophy prioritizes
serviceability, with all maintenance points accessible from one side and
a mechanical fuel system that eliminates dependence on electronic
control units for basic operation.
The Isuzu 3CE1 operates on a four-stroke cycle and uses a three-cylinder
inline configuration. The naturally aspirated induction system draws air
without turbocharging, which simplifies the engine bay layout and
reduces heat rejection. The direct injection combustion system injects
fuel directly into the cylinder bowl, creating a mixture that ignites
immediately upon injection.
Engine Type: 3-Cylinder, 4-Cycle, Vertical Water-Cooled Diesel
Number of Cylinders: 3
Displacement: 1.642 Liters (97.6 cu.in)
Bore x Stroke: 88 mm x 90 mm (3.46 in x 3.54 in)
Aspiration: Naturally Aspirated
Combustion System: Direct Injection
Compression Ratio: 19.0:1
Firing Order: 1-3-2
Rotation (viewed from flywheel): Counterclockwise
Industrial Drive Max Power: 26.9 kW (36.1 hp) at 3000 RPM
Industrial Drive Peak Torque: 103 Nm (76 lb-ft) at 1800 RPM
Constant Speed Max Power (Generator - 1800 RPM): 15.7 kW (21.1 hp)
Constant Speed Torque (1800 RPM): 83.2 Nm (61.4 lb-ft)
Generator High Speed Max Power (3000 RPM): 17.3 kW (23.2 hp)
Idle Speed: 800-900 RPM
Governed Max Speed: 3000 RPM (industrial) / 1800 or 3000 RPM (generator)
Continuous Operating Range: 1200-3000 RPM
The cylinder block on the Isuzu 3CE1 is a monobloc cast-iron
construction. This material provides high rigidity, excellent vibration
damping, and resistance to thermal distortion under varying loads. The
block features an open-deck design at the top where the cylinder bores
are not completely surrounded by cast iron, allowing improved coolant
flow around the upper cylinder area for more uniform cooling. The
crankcase is an integral part of the block, extending below the
crankshaft centerline.
A stamped steel oil pan bolts to the bottom of the block. The block
incorporates replaceable dry-type cylinder liners in some service
configurations, though many versions use parent bore technology where
pistons run directly on precision-honed cast iron surfaces. Passages
cast into the block direct coolant from the water pump to the cylinder
bores and upward into the cylinder head. The side of the block provides
mounting pads for the injection pump, starter motor, and optional
auxiliary equipment such as hydraulic pumps.
The cylinder head is a single, cross-flow cast-iron casting. The
cross-flow pattern positions the intake manifold on one side and the
exhaust manifold on the opposite side, reducing heat transfer to the
incoming air charge. The valve train operates via an overhead valve
(OHV) configuration using pushrods and rocker arms.
A single camshaft located within the cylinder block opens the valves
through mechanical lifters, pushrods, and forged steel rocker arms. The
cylinder head gasket is a multi-layer steel (MLS) design for improved
sealing under high cylinder pressures.
Valves per Cylinder: 2 (1 intake, 1 exhaust)
Valve Configuration: Overhead valve, pushrod-actuated
Valve Seat Inserts: Induction-hardened steel (exhaust seats)
Valve Guide Material: Cast iron
Valve Lash Adjustment: Mechanical screw and locknut on rocker arm
Intake Valve Clearance (Cold): 0.20 mm (0.008 in)
Exhaust Valve Clearance (Cold): 0.25 mm (0.010 in)
Valve Adjustment Interval: 500 operating hours
The Isuzu 3CE1 employs a mechanical direct injection fuel system without
electronic controls. This system consists of an in-line injection pump,
high-pressure fuel lines, and multi-hole pencil-type injectors. The
mechanical governor integrated into the injection pump maintains stable
speed under varying loads, a critical feature for generator and
constant-speed applications. The electric lift pump includes a prime
function, eliminating manual bleeding after filter changes. The system
returns excess fuel and entrained air through a bypass line to the fuel
tank.
Injection Pump Type: In-line, mechanical (Bosch or Zexel)
Injector Type: Mechanical, multi-hole (4 holes x 0.18 mm)
Injection Pressure (opening): 18.0 MPa (180 bar / 2610 psi)
Injection Timing: 10 degrees before top dead center (dynamic)
Fuel Lift Pump: Electric, self-priming
Fuel Filters: Spin-on, 10-micron primary filter with water separator
Fuel Filters: Spin-on, secondary filter downstream
Fuel Grade: Diesel meeting EN 590 or ASTM D975 No. 2-D
The lubrication system is a forced-feed, full-flow pressure system. A
trochoid-type gear pump, driven directly from the crankshaft nose, draws
oil from the sump and forces it through a full-flow spin-on filter. From
the filter, oil travels to the main oil gallery, then distributes to the
crankshaft main bearings, connecting rod bearings, camshaft bearings,
and valve train.
A pressure relief valve set at 4.0 bar (58 psi) regulates maximum system
pressure. An optional oil cooler is available for high-ambient or
continuous full-load applications. The cooler uses engine coolant to
stabilize oil temperature.
Lubrication Type: Forced feed, full-flow filtration
Oil Pump Type: Trochoid (internal gear)
Oil Capacity (including filter): 6.7 Liters (7.1 U.S. quarts)
Oil Pressure (idle, hot 80°C): Minimum 1.0 bar (14.5 psi)
Oil Pressure (3000 RPM, hot): 3.5-4.5 bar (51-65 psi)
Oil Filter: Full-flow spin-on, bypass valve integrated
Oil Grade: API CK-4 or CJ-4, 15W-40 (standard) or 5W-30 (cold climates)
Oil Change Interval (standard oil pan): 250 hours
Oil Change Interval (large capacity oil pan): 500 hours
The cooling system is a pressurized, thermosiphon-assisted forced
circulation design. A belt-driven centrifugal pump circulates coolant
through the cylinder block, cylinder head, and optional oil cooler. A
wax-pellet thermostat controls coolant flow to the radiator, providing
rapid warm-up and stable operating temperature.
The cooling system includes a bypass circuit that allows coolant to
circulate within the engine block and cylinder head until the thermostat
opens, preventing localized hot spots during warm-up.
Cooling System Type: Pressurized, forced circulation, water-cooled
Water Pump Type: Belt-driven, centrifugal
Coolant Capacity (engine block only): 2.0 Liters (2.1 U.S. quarts)
Coolant Capacity (with radiator and hoses): 5.5-7.0 Liters depending on
installation
Thermostat Opening Temperature: 76.5°C (170°F)
Thermostat Fully Open Temperature: 90°C (194°F)
System Pressure (radiator cap): 0.9 bar (13 psi)
Fan Drive: Belt-driven, suction type, attached to water pump pulley
Coolant Type: Ethylene glycol-based, 30-50% concentration
| Intake and Exhaust Systems |
Air Intake System: Air enters through a replaceable dry-type paper
element air cleaner. The system uses a single intake manifold cast
integrally with the cylinder head. No turbocharger or charge air cooler
is present. A cold-start aid (glow plug) is installed in the intake port
of each cylinder.
Exhaust System: A cast-iron exhaust manifold with three ports (one per
cylinder) merges into a single outlet. The manifold mounting flange is
oriented upward or horizontally depending on application. The engine
meets EPA Tier 4 Final and EU Stage V using internal exhaust gas
recirculation (not an external EGR cooler) and oxidation catalyst with
some generator set configurations.
The 3CE1 operates on a 12-volt negative ground electrical architecture.
The starting system includes a reduction-gear starter motor for high
cranking torque. System Voltage: 12V DC. Alternator Output: 40 A
(standard) or 60 A (optional). Starter Motor: Reduction-gear type, 1.4
kW (1.9 hp).
Glow Plug Type: Sheathed ceramic or metal heating element. Glow Plug
Operating Voltage: 11 V (post-energized). Preheat Time (0°C to 20°C
ambient): 3-5 seconds. Preheat Time (-15°C ambient): 10 seconds, with
post-heat.
Dry Weight (basic engine): 158 kg (348 lbs) to 165 kg (384 lbs)
Length (flywheel to fan): 611 mm to 619 mm (24.1 in to 24.4 in)
Width: 509 mm to 514 mm (20.0 in to 20.2 in)
Height (oil pan to rocker cover): 682 mm (26.9 in)
Oil and Filter Change (standard pan): 250 hours.
Oil and Filter Change (large capacity pan): 500 hours.
Fuel Filter Primary (water separator): 500 hours.
Fuel Filter Secondary: 500 hours.
Air Cleaner Element Check: every 100 hours.
Air Cleaner Element Replacement: every 500 hours.
Valve Clearance Adjustment: 500 hours
Coolant Replacement: 2,000 hours or 2 years.
Fan Belt Inspection: 250 hours; tension check at 500 hours.
Fan Belt Replacement: 1,000 hours or at any sign of cracking.
Glow Plug Inspection: 1,000 hours.
Injection Pump Timing Check: 2,000 hours.
Injector Nozzle Replacement: 3,000 hours.
Cylinder Head Bolts (M12 x 1.75), Stage 1: 40 Nm (30 lb-ft)
Cylinder Head Bolts (M12 x 1.75), Stage 2: 80 Nm (59 lb-ft)
Connecting Rod Bolts (M9 x 1.0): 39 Nm (29 lb-ft)
Main Bearing Cap Bolts (M12 x 1.75): 69 Nm (51 lb-ft)
Flywheel Bolts (M10 x 1.25): 54 Nm (40 lb-ft)
Crankshaft Pulley Bolt (M16 x 1.5): 177 Nm (131 lb-ft)
Injection Pump Mounting Nuts: 25 Nm (18 lb-ft)
Injector Hold-Down Clamp Bolt: 25 Nm (18 lb-ft)
High-Pressure Fuel Line Nuts: 25 Nm (18 lb-ft)
Rocker Arm Shaft Bracket Bolts: 25 Nm (18 lb-ft)
Valve Cover Bolts: 10 Nm (7.4 lb-ft)
Oil Pan Bolts (M8 x 1.25): 18 Nm (13 lb-ft)
Oil Filter (spin-on): 15 Nm (11 lb-ft)
Exhaust Manifold Bolts (M10 x 1.25): 44 Nm (32 lb-ft)
Intake Manifold Bolts (M8 x 1.25): 25 Nm (18 lb-ft)
Water Pump Mounting Bolts: 25 Nm (18 lb-ft)
Thermostat Housing Bolts: 25 Nm (18 lb-ft)
Starter Motor Mounting Bolts: 44 Nm (32 lb-ft)
Alternator Pivot and Adjustment Bolts: 25 Nm (18 lb-ft)
Glow Plug (into cylinder head): 12 Nm (9 lb-ft)
The Isuzu 3CE1 is not an on-highway automotive engine. It serves as a
compact power unit in mobile and stationary industrial equipment.
Aerial Work Platforms (Boom Lifts and Scissor Lifts): Aichi SR12B,
SR12D, and similar models requiring a low-profile, low-emission diesel
power pack.
Generator Sets: Portable and standby generators from 12 kVA to 20 kVA at
1800 RPM (60 Hz) or 3000 RPM (50 Hz) including brands such as Denyo,
Multiquip, and Atlas Copco.
Small Construction Equipment: Skid-steer loaders (compact track
loaders), mini-excavators, and ride-on trowels.
Agricultural Equipment: Small tractors (18-25 hp), irrigation pump
drives, and grain auger power units.
Material Handling: Rough-terrain forklifts and container stackers.
Ground Support Equipment: Aircraft tugs and baggage belt loaders at
regional airports.
Marine Auxiliary: Small workboat generator sets and hydraulic power
packs for deck machinery.
Municipal Equipment: Street sweepers, small refuse compactors, and
utility vehicle power units.
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