Hyundai D4CB Specifications
| Engine Model: Hyundai D4CB |
| Engine Type: 4-cycle inline 4-cylinder 16-valve turbocharged liquid-cooled diesel |
| Total Displacement: 152.4 cu.in (2.49 L) |
| Rated Engine Power: 100-168 Hp (74-125 kW) at 4000 rpm |
| Fuel System Type: Common-rail direct injection |
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The Hyundai D4CB engine is a four-cylinder
turbocharged diesel engine developed by Hyundai Motor Company as part of
its A-series and later CRDi light commercial diesel program. The D4CB is
best known as the 2.5-liter CRDi diesel engine used extensively in
Hyundai light commercial vehicles, vans, and pickup platforms from the
early 2000s onward. It represents Hyundai’s move toward modern
high-pressure common-rail diesel technology combined with robust
construction suitable for sustained commercial use.
The engine has been produced in multiple configurations, including
naturally aspirated early versions and later turbocharged and
intercooled CRDi variants. It is widely regarded for its durability,
strong low- and mid-range torque characteristics, and adaptability to a
wide range of operating conditions. The D4CB has been used globally and
remains in production in updated forms for certain markets.
The Hyundai D4CB is a four-stroke, water-cooled, inline four-cylinder
diesel engine operating on the diesel combustion cycle. The engine is
designed primarily for longitudinal installation in rear-wheel-drive
vehicle platforms, although it has also been adapted for certain
all-wheel-drive applications.
Engine operation is managed by an electronic control unit in CRDi
versions, which regulates fuel injection timing and quantity,
turbocharger boost pressure, idle speed, and emissions-related systems.
The overall design emphasizes strength, serviceability, and long service
life under commercial duty cycles.
The total engine displacement of the Hyundai D4CB is 2,497 cc,
equivalent to about 152.4 cubic inches. The engine employs four
cylinders arranged in a single inline bank. Cylinder bore is 91.0 mm
(3.58 inches), and piston stroke is 96.0 mm (3.78 inches), producing a
moderately long-stroke configuration optimized for torque output.
The compression ratio varies by version but is in the range of 17.7:1 to
18.5:1 for CRDi variants. Power output ranges from 74 kW (100 Hp) in
early naturally aspirated versions to 125 kW (168 Hp) in later
turbocharged CRDi versions. Maximum power is generally produced between
3,800 and 4,000 revolutions per minute. Peak torque ranges from 245 to
392 Nm (181 to 289 lb-ft) depending on calibration, available from
around 1,800 to 2,500 rpm. Idle speed is electronically controlled at
750 to 800 rpm. The firing order is 1-3-4-2.
The cylinder block is manufactured from high-strength cast iron to
withstand high combustion pressures and long-term mechanical loading.
The block incorporates cast-in cylinder bores, integrated coolant
passages, and internal oil galleries for lubrication distribution.
The crankshaft is forged steel and supported by five main bearings. Main
bearing caps are secured using high-strength bolts to ensure crankshaft
stability. Thrust control is provided by thrust bearing surfaces
integrated into the center main bearing. The block design emphasizes
rigidity and resistance to distortion under sustained load.
Pistons are aluminum alloy units with reinforced crowns designed for
direct injection diesel combustion. Each piston is fitted with two
compression rings and one oil control ring. Connecting rods are forged
steel with fracture-split big ends to ensure precise bearing alignment
and durability.
The cylinder head is manufactured from aluminum alloy to improve heat
dissipation and reduce overall engine mass. It features a crossflow
design with intake ports on one side and exhaust ports on the opposite
side. The engine uses four valves per cylinder, resulting in a total of
sixteen valves.
Valve actuation is handled by double overhead camshafts driven by a
toothed timing belt. The camshafts operate the valves through
bucket-type tappets with hydraulic lash adjustment, eliminating the need
for routine valve clearance adjustment. Valve timing is fixed on early
versions, while later variants may incorporate limited variable timing
for emissions optimization.
The timing belt also drives auxiliary components and must be replaced at
specified service intervals to prevent severe engine damage.
The D4CB engine employs a direct injection combustion system. Fuel is
injected directly into the combustion chamber formed by the piston crown
and cylinder head. The chamber geometry promotes efficient air-fuel
mixing, stable combustion, and controlled emissions.
The fuel system is a high-pressure common-rail direct injection system
supplied by Bosch or Delphi, depending on production year. Fuel is
delivered from the tank by a low-pressure electric pump to a
high-pressure pump driven by the engine.
The high-pressure pump supplies fuel to a common rail at pressures of up
to 1,600 bar (23,200 psi) on later variants. Electronically controlled
injectors deliver precisely metered fuel to each cylinder. Injection
timing, pressure, and duration are controlled by the engine control unit
based on inputs from multiple sensors. Recommended fuel is ultra-low
sulfur diesel meeting EN 590 or equivalent standards.
The lubrication system is a full-pressure, wet-sump design. Engine oil
is drawn from the sump by a crankshaft-driven oil pump and distributed
through internal galleries to the crankshaft bearings, camshaft
bearings, valve gear, turbocharger bearings, and other critical
components.
A full-flow oil filter removes contaminants from the oil. An oil cooler
integrated into the cooling system regulates oil temperature. Total oil
capacity with filter replacement is 7.4 liters (7.8 US quarts, 6.5
Imperial quarts). Recommended engine oil viscosity is SAE 5W-30 or 5W-40
meeting Hyundai diesel engine specifications.
The cooling system is a closed-loop, pressurized liquid cooling system.
A belt-driven centrifugal water pump circulates coolant through the
engine block, cylinder head, radiator, heater core, EGR cooler, and
associated hoses. A thermostat regulates coolant flow and begins opening
at 88C (190F).
Total cooling system capacity is 9.5 liters (10.0 US quarts, 8.4
Imperial quarts). Recommended coolant is a 50/50 mixture of ethylene
glycol antifreeze and deionized water meeting Hyundai coolant
specifications.
| Exhaust and Emissions Systems |
The exhaust system includes an exhaust manifold integrated with the
turbocharger, an oxidation catalyst, and depending on production year,
exhaust gas recirculation and diesel particulate filter systems. Earlier
versions meet Euro 3 or Euro 4 emissions standards, while later variants
meet Euro 5 and equivalent regulations.
The engine operates on a 12-volt electrical system. Engine management is
handled by an electronic control unit that controls fuel injection,
turbocharger operation, glow plug timing, idle speed, and
emissions-related systems. Key sensors include crankshaft and camshaft
position sensors, mass air flow sensor, manifold absolute pressure
sensor, coolant temperature sensor, and exhaust temperature sensors.
| TURBOCHARGING AND AIR INDUCTION SYSTEM |
Most D4CB engines are equipped with an exhaust-driven turbocharger.
Early versions use a fixed-geometry turbocharger with wastegate control,
while later versions employ variable geometry turbochargers for improved
response and efficiency. Charge air is cooled by an air-to-air
intercooler.
The intake system includes a panel-type air filter, intake ducting, and
an electronically controlled intake throttle valve used primarily for
emissions control and engine shutdown smoothing.
Approximate external engine dimensions are 760 mm (29.9 inches) in
length, 690 mm (27.2 inches) in width, and 780 mm (30.7 inches) in
height. Dry engine weight is 215 kg (474 lbs).
Routine maintenance includes regular engine oil and filter replacement,
air and fuel filter servicing, and cooling system inspection. The oil
change intervals range from 10,000 to 15,000 km (6,000 to 9,000 miles)
depending on service conditions. The timing belt replacement interval is
90,000 km (56,000 miles) or 5 years. Glow plugs should be inspected
periodically and replaced as necessary.
The tightening torques are as follows. Cylinder head bolts are tightened
using a torque-and-angle procedure as specified by Hyundai service
documentation. Main bearing cap bolts are tightened to approximately 65
Nm (48 lb-ft) plus angle. Connecting rod bolts are tightened to
approximately 30 Nm (22 lb-ft) plus angle. Injector clamp bolts are
tightened to approximately 32 Nm (24 lb-ft). Engine oil drain plug
torque is approximately 40 Nm (30 lb-ft).
Hyundai Porter II (H100/H1 pickup) - 2004 to present
Hyundai H-1 / Starex (TQ) - 2002 to 2018
Hyundai Galloper II (diesel variants) - 1998 to 2003
Hyundai Bongo III / Kia Bongo III - 2004 to present
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