Isuzu C190 Specifications
| Engine Model: Isuzu C190 |
| Engine Type: 4-cycle inline 4-cylinder liquid-cooled diesel |
| Total Displacement: 116 cu.in (1.9 L) |
| Rated Engine Power: 45-52 Hp (33.5-38.5 kW) at 3200 rpm |
| Aspiration Type: Naturally aspirated |
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The Isuzu C190 engine family includes the
original C190, the improved C190-II, and several industrial-use variants
adapted for stationary, agricultural, and construction equipment.
Designed as part of Isuzu's long-running C-series of light diesel
engines, the C190 is known for durability, low operating cost,
mechanical simplicity, and reliable torque delivery at low rpm.
These engines powered Isuzu pickup trucks, early SUVs, utility vehicles,
farm equipment, compact construction machinery, and industrial power
units across global markets. Their cast-iron construction, gear-driven
camshaft, and fully mechanical direct injection made them ideal for
regions requiring dependable engines with minimal electronic dependence.
The C190-II introduced refinements in fuel efficiency, reliability, and
starting performance, while industrial variants were optimized for
continuous-duty work.
The C190 engine series is a four-stroke inline four diesel design with a
displacement of approximately 1878 cc, or about 1.9 liters (116 cu.in).
Bore is 86.0 mm or 3.39 inches. Stroke is 76.0 mm or 2.99 inches. This
undersquare design promotes low-speed torque, reduces wear through
moderate piston speeds, and supports long service life. Compression
ratio is approximately 21.0:1 depending on the variant.
Power output varies from 56 to 62 horsepower at around 4300 rpm for the
automotive version. Industrial versions are derated for continuous-duty
reliability, typically producing between 45 and 52 horsepower at 2800 to
3200 rpm. Torque output ranges from 110 to 120 Nm or 81 to 89 lb-ft at
about 2200 to 2400 rpm. Idle speed is generally set around 750 rpm. The
firing order is 1-3-4-2, and crankshaft rotation is clockwise when
viewed from the front.
The crankshaft is a forged steel unit operating in five main bearings
for stability. Pistons are aluminum alloy with steel reinforced ring
lands. Each piston uses three rings: two compression and one oil
control. Connecting rods are forged steel with high fatigue resistance.
The engine block is cast iron with thick cylinder walls for durability.
The cylinder head is cast iron featuring swirl-type precombustion
chambers for efficient combustion and improved cold starting. The
camshaft is located in the block and operates valves via pushrods and
rocker arms. This arrangement is extremely durable and easily
serviceable, making it suitable for rough environments.
C190-II Enhancements
Improvements introduced in the C190-II
include:
- Revised combustion chamber geometry for cleaner burn
- Higher efficiency injectors
- Strengthened rocker assemblies
- Improved cooling passage layout
- More durable front oil seal design
- Enhanced cold-start capability through improved glow plug control.
Industrial C190 Versions
Industrial versions are designed for
constant-speed operation. Modifications include:
- Heavy-duty governor calibration for stable rpm
- Optional oversized radiators for stationary units
- Reinforced bearings for long continuous operation
- Hydraulic pump drive options
- Long-life air filtration systems for dusty environments.
The C190 uses a mechanical direct injection system. A gear-driven
in-line fuel injection pump meters and times the fuel delivery. A
mechanical governor controls rpm. High-pressure steel lines feed
mechanical pintle or multi-hole injectors depending on the model year.
A mechanical lift pump draws fuel through a primary water separator and
into a fine secondary filter. Clean fuel is essential for injector and
pump life. Recommended fuel is standard No. 2 diesel. Fuel filter
replacement is every 20,000 km or 12,000 miles, and the water separator
should be drained regularly. Injector testing is recommended every
80,000 to 100,000 km.
Lubrication uses a full-pressure wet sump system. A gear-driven trochoid
oil pump draws oil through a screened pickup and forces it through a
full-flow spin-on oil filter. The main oil gallery feeds crankshaft
bearings, rod bearings, camshaft bearings, rocker assemblies, and
ancillary components. Oil capacity is around 4.5 liters or 4.7 US
quarts. Normal oil pressure is 300 to 400 kPa or 43 to 58 psi at speed.
Hot idle pressure is 70 to 100 kPa or 10 to 15 psi. Recommended oil
grade is SAE 15W-40 for most climates. Automotive versions follow a 5000
to 8000 kilometer oil change interval, while industrial engines
typically require oil changes every 150 to 250 operating hours.
The cooling system uses a belt-driven centrifugal water pump to
circulate coolant through the cast-iron block, cylinder head, and
radiator. The thermostat begins to open near 82C or 180F and is fully
open around 95C or 203F. Cooling system capacity is about 6.0 liters or
6.3 US quarts.
Radiators may be copper-brass or aluminum depending on year. Industrial
engines use larger radiators or auxiliary coolers. Coolant should be
replaced every 40,000 km or every two years. The system is pressurized
to about 90 to 110 kPa or 13 to 16 psi.
| Intake and Exhaust Systems |
Induction is naturally aspirated. A dry-type air filter with optional
cyclone pre-cleaner is used. The intake manifold is cast aluminum or
cast iron. The exhaust manifold is high-temperature cast iron. Early
engines have minimal emissions equipment. Later C190-II and export
models may use basic EGR systems. Exhaust routing is simple to support
low maintenance.
| Electrical and Starting Systems |
The C190 uses a 12-volt electrical system with a 35 to 45 ampere
alternator and a heavy-duty 12-volt reduction starter. Industrial units
may be equipped with 24-volt starting systems. Glow plugs assist cold
starting and should be checked regularly. Battery health and grounding
are essential for reliable starts.
| Valve Timing and Drive Mechanism |
The camshaft and fuel injection pump are gear-driven. Valve actuation
uses pushrods and rocker arms. Valve clearances require manual
adjustment every 20,000 km.
Standard cold clearances:
Intake - 0.25 mm or 0.010 inches
Exhaust - 0.30 mm or 0.012 inches
Standard dimensions:
Length: 650 mm or 25.6 inches
Width: 550 mm or 21.7 inches
Height: 670 mm or 26.4 inches
Dry weight: 160 to 175 kg or 353 to 386 lbs
Routine maintenance includes:
Oil and filter change every 5000 to 8000 km
Fuel filter replacement every 20,000 km
Air filter inspection every 10,000 km and replacement every 20,000 to
30,000 km
Valve clearance checks every 20,000 km
Coolant replacement every two years
Injector service every 80,000 to 100,000 km
Compression pressure:
Normal: 2600 to 3000 kPa or 377 to 435 psi
Minimum: 2200 kPa or 319 psi
Cylinder head bolts: 90 Nm then 120 Nm
Main bearing caps: 110 Nm
Connecting rod bolts: 60 Nm
Flywheel bolts: 120 Nm
Intake manifold bolts: 30 Nm
Exhaust manifold nuts: 35 Nm
Injector hold-down nuts: 25 Nm
Oil drain plug: 35 Nm
The C190 engine family powered:
Isuzu Faster and KB pickups
Early Isuzu Trooper and MU models
Utility vehicles in Asia and Africa
Agricultural tractors and implements
Construction equipment such as compact loaders
Stationary generators, compressors, and water pumps.
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| Industrial Engines Technical Specifications |
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| Car Engines Technical Specifications |
| Outboard Engines Technical Specifications |
