Isuzu 4JK1-TC Specifications
| Engine Model: Isuzu 4JK1-TC |
| Engine Type: 4-stroke in-line 4-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 152.5 cu.in (2.49 L) |
| Rated Engine Power: 116 Hp (85 kW) at 3600 rpm |
| Fuel System Type: Common rail direct injection |
____________________________________________________________________________________
The Isuzu 4JK1-TC is a 2.5-liter inline
4-cylinder turbocharged diesel engine from Isuzu’s J-Series iTEQ family,
introduced in 2005 as the efficient counterpart to the larger 3.0-liter
4JJ1 engine. Sharing a similar architecture with its larger sibling, the
4JK1 features a compacted graphite iron cylinder block, a 16-valve DOHC
cylinder head, and a common rail direct injection fuel system.
This engine became a mainstay in the Isuzu D-Max and Chevrolet Colorado
pickup trucks across global markets, including Southeast Asia,
Australia, Europe, and South America. The 4JK1-TC was produced in
multiple power output variants, ranging from a fuel-economy focused 116
hp version to a higher-output 136 hp variant featuring variable geometry
turbocharging (VGT). Its robust construction, maintenance-free timing
chain, and emphasis on low-end torque delivery made it suitable for both
commercial fleet operations and private ownership.
Engine Family: Isuzu J-Series (iTEQ / DDi iTEQ)
Engine Code: 4JK1-TC
Configuration: Inline 4-cylinder, 4-stroke, water-cooled turbocharged
diesel
Displacement: 2499 cc (152.5 cu.in)
Bore: 95.4 mm (3.76 in)
Stroke: 87.4 mm (3.44 in)
Compression Ratio: 18.1:1 to 18.3:1
Valvetrain Configuration: DOHC, 16 valves (4 per cylinder)
Firing Order: 1-3-4-2
Fuel System: High-pressure common rail direct injection (CRDi)
Maximum Power: 85 kW (116 hp) at 3600 rpm
Maximum Torque: 280 Nm (207 lb-ft) at 1800-2200 rpm
Idle Speed: 700-750 rpm
Aspiration: Turbocharged and intercooled
Emission Standard: Euro 4, Euro 5 (or local equivalents)
The cylinder block is constructed from compacted graphite iron,
utilizing a liner-less design with induction-hardened bore surfaces
(melt-in liners) similar to the larger 4JJ1 series. This construction
provides high strength and rigidity while maintaining acceptable weight.
The block features a deep-skirt design with five main bearings
supporting a forged steel crankshaft.
Cylinder bores are precision-machined directly into the parent material
with a plateau-honed finish. The block incorporates an integral oil
gallery and mounting bosses for the common rail components and engine
mounts specific to the D-Max and Colorado chassis. Piston cooling jets
are integrated into the crankcase structure, providing continuous oil
spray to the underside of each piston crown.
The cylinder head is manufactured from a cast aluminum alloy using a
cross-flow design, with the intake manifold positioned on one side and
the exhaust manifold on the opposite side. The DOHC arrangement operates
16 valves via roller rocker arms.
Valve clearances are adjustable using shims; this engine does not employ
hydraulic lash adjusters. Cold valve clearance specification is 0.15 mm
(0.006 in) for both intake and exhaust valves. Valve seat inserts are
pressed into the head and machined at 45-degree angles, with exhaust
seats receiving stellite facing for high-temperature durability.
The 4JK1-TC utilizes a common rail direct injection (CRDi) system
operating at high pressure. A high-pressure pump, driven by the timing
chain, supplies fuel to the rail. Four solenoid-actuated injectors are
positioned centrally in the combustion chamber.
The system employs multiple injection events per combustion cycle to
optimize combustion noise, emissions, and power output. A fuel cooler
and a fuel filter with integrated water separator are mounted in the
engine compartment. The system is designed to operate with low-sulfur
diesel fuel.
The lubrication system is a wet-sump configuration utilizing a gear-type
or rotor-type oil pump. System capacity varies by oil pan and vehicle
application, ranging from 7.0 to 7.6 liters (7.4 to 8.0 qt).
Recommended oil viscosity is SAE 5W-30 or 10W-30 meeting API SM/CF or
higher specifications, or ACEA classification appropriate for diesel
engines with DPF where fitted. Oil pressure at operating speed is
maintained within specified ranges. A full-flow spin-on oil filter with
bypass valve is mounted on the cylinder block.
The cooling system operates under pressure with a sealed expansion tank.
Water pump is driven by the accessory belt or timing system. System
total capacity is 10.0 liters (10.6 qt). A wax-pellet thermostat
regulates coolant temperature.
An engine-driven fan or electric cooling fan(s) provide airflow through
the radiator, with configuration depending on vehicle platform. Coolant
specified is ethylene glycol-based, mixed at appropriate ratio with
distilled water.
Induction System: Turbocharger with air-to-air intercooler. Maximum
boost pressure varies by variant.
Exhaust System: Cast iron exhaust manifold. Emissions equipment includes
Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) on
certain variants, and Exhaust Gas Recirculation (EGR) system with
cooler.
Engine Management: ECU controls fuel injection timing, injection
pressure, VGT vane position (where equipped), and exhaust aftertreatment
regeneration strategies.
Electrical System: 12-volt system with glow plugs for cold starting
assistance.
Overall Length: 680 mm (26.8 in).
Overall Width: 650 mm (25.6 in).
Overall Height: 750 mm (29.5 in).
Dry Engine Weight (without coolant, oil, and accessories): 200 kg (441
lb).
Fully Dressed Weight (with turbocharger, manifolds, and ancillaries):
230 kg (507 lb).
Oil Change Interval: 15,000 km (9,321 mi) or 12 months under normal
service.
Oil Filter Replacement: Replace at every oil change.
Valve Clearance: Inspect every 40,000-60,000 km (24,855-37,282 mi).
Fuel Filter Replacement: 30,000-40,000 km (18,641-24,855 mi).
Air Filter Replacement: 30,000 km (18,641 mi) or as indicated by
restriction gauge.
Coolant Replacement: 160,000 km (99,419 mi) or 60 months.
Drive Belt (Accessory): Inspect every 20,000 km (12,427 mi).
Drive Belt Replacement interval: 80,000-100,000 km (49,710-62,137 mi).
EGR System Inspection: Inspect for carbon accumulation at 80,000 km
(49,710 mi).
Diesel Particulate Filter (DPF): Automatic regeneration.
Cylinder Head Bolts, Stage 1: 70 Nm (52 lb-ft)
Cylinder Head Bolts, Stage 2: 70 Nm (52 lb-ft)
Flywheel Bolts: 100-120 Nm (74-89 lb-ft)
Camshaft Sprocket Bolts: 80-100 Nm (59-74 lb-ft)
Intake Manifold Bolts: 20-25 Nm (15-18 lb-ft)
Exhaust Manifold Nuts: 25-30 Nm (18-22 lb-ft)
Turbocharger Mounting Nuts: 30-35 Nm (22-26 lb-ft)
Glow Plugs: 15-20 Nm (11-15 lb-ft)
Engine Oil Drain Plug: 35-40 Nm (26-30 lb-ft)
Oil Filter: 25 Nm (18 lb-ft) (apply light coat of oil to seal)
Water Pump Bolts: 20-25 Nm (15-18 lb-ft)
Isuzu D-Max (First Generation / Second Generation): 2005-Current
(continues in certain markets), longitudinal front-engine, rear-wheel
drive and 4x4 configurations; 4JK1-TC as 2.5-liter diesel option
alongside 3.0-liter 4JJ1.
Isuzu Rodeo: 2005-2011 (various markets), longitudinal front-engine,
rear-wheel drive and 4x4.
Isuzu MU-X (SUV): 2013-Current, body-on-frame SUV derived from D-Max
platform; 4JK1-TC as base 2.5-liter diesel option in certain markets
(later replaced by 1.9-liter RZ4E in some regions).
Chevrolet Colorado (First Generation / Second Generation): 2005-Current
(varies by market), longitudinal front-engine, rear-wheel drive and 4x4;
4JK1-TC as 2.5-liter diesel engine option in global markets outside
North America.
Holden Colorado (RA / RG): 2008-2016 (Australian market), longitudinal
front-engine, rear-wheel drive and 4x4; 4JK1-TC as 2.5-liter diesel
option.
Isuzu KB Series: 2005-2016 (South African and other markets),
longitudinal front-engine, rear-wheel drive and 4x4; 4JK1-TC as
2.5-liter diesel engine option.
Chevrolet D-Max: Various markets (Europe, South America); 4JK1-TC as
2.5-liter diesel option in Chevrolet-branded Isuzu D-Max variants.
____________________________________________________________________________________
| Industrial Engines Technical Specifications |
| Car Engines Technical Specifications |
| Small Engines Technical Specifications |
| Outboard Engines Technical Specifications |
