Isuzu 6TE1 Specifications
| Engine Model: Isuzu 6TE1 |
| Engine Type: 4-stroke in-line 6-cylinder liquid-cooled diesel |
| Total Displacement: 1155 cu.in (18.9 L) |
| Rated Engine Power: 365-380 Hp (272-283 kW) at 2100 rpm |
| Fuel System Type: Common rail direct injection |
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The Isuzu 6TE1 is a heavy-duty inline
6-cylinder diesel engine displacing 18.9 liters, introduced to meet 1999
Japanese emissions regulations. This engine serves as the primary
powerplant for Isuzu’s largest heavy-duty trucks and tractors, including
the Giga CXZ, CYZ, and EXD series. The 6TE1 was developed with a focus
on high durability and high-torque delivery at low engine speeds,
characteristics essential for long-distance hauling, dump truck
operations, and construction duties.
A naturally aspirated variant, designated 6TE1-S, was specifically added
to the Giga lineup in January 2001 for applications requiring flat
torque characteristics and ease of operation at work sites, such as dump
trucks and special-purpose vehicles. This engine incorporated electronic
control common rail high-pressure fuel injection to reduce particulate
matter, black smoke, and nitrogen oxide emissions. A turbocharged with
intercooler variant was also produced for higher output requirements in
tractor units and heavy cargo transport.
Engine Type: Inline 6-cylinder, 4-cycle, water-cooled diesel
Number of Cylinders: 6
Displacement: 18,930 cc (18.9 L / 1155 cu.in)
Aspiration: Naturally aspirated (6TE1-S)
Aspiration: Turbocharged with air-to-air intercooler
Fuel System: Common rail direct injection
Emission Standard: Japanese 1999 emissions regulations
Rated Power (6TE1-S): 272 kW (365 hp) at 2,100 rpm
Maximum Power (turbo): 280-283 kW (375-380 hp) at 2,000-2,100 rpm
Peak Torque (6TE1-S): 1,300-1,400 Nm (960-1,033 lb-ft) at 1,200-1,400
rpm
Peak Torque (turbo): 1,450-1,550 Nm (1,070-1,143 lb-ft) at 1,100-1,300
rpm
Governed Speed: 2,400 rpm (no load)
Low Idle Speed: 600 to 650 rpm
Rotation (from flywheel end): Counter-clockwise
The cylinder block is manufactured from high-strength cast iron using a
deep-skirt design with cross-bolted main bearing caps. This
configuration provides the structural rigidity required to withstand
cylinder pressures exceeding 180 bar (2,610 psi) under full load
conditions. The block is a wet-liner design, accepting six individually
replaceable cylinder liners. Each liner is centrifugally cast from a
chromium-molybdenum alloy iron and is sealed at the lower end with
O-rings and at the upper end with a copper or steel fire ring.
The wet liner design permits direct coolant contact around the liner
barrel, providing superior heat transfer away from the combustion zone.
The cylinder block incorporates seven main bearing bulkheads, each
fitted with four bolts per cap and additional cross-bolts from the side
of the block. An integrated oil gallery runs the full length of the
block, supplying pressurized oil to the main bearings, piston cooling
jets, and the cylinder head. The timing chain housing is cast into the
front face of the block.
The cylinder head is a single-piece cast iron unit, heat-treated to
relieve residual casting stresses. The valve arrangement uses four
valves per cylinder, two intake and two exhaust, arranged in a
cross-flow configuration. Intake ports are positioned on the right side
of the cylinder head, while exhaust ports exit on the left side when
viewed from the flywheel end. Intake valve diameter is 45 mm (1.77 in).
Exhaust valve diameter is 40 mm (1.57 in). The exhaust valves are
manufactured from a nickel-chromium superalloy with a Stellite-faced tip
and are sodium-filled to conduct heat from the valve face to the stem
guide.
The valve train operates via an overhead camshaft arrangement driven by
a timing chain. Bucket-type tappets with integrated shims are used for
valve lash adjustment. The cylinder head gasket is a multi-layer steel
(MLS) design consisting of five layers of embossed stainless steel with
a nitrile rubber sealing bead around each cylinder bore and each coolant
passage. The pre-combustion chamber is not used; this engine employs
direct injection with the injector nozzle positioned centrally in the
piston bowl.
The fuel system is an electronic control common rail high-pressure
direct injection system. A high-pressure supply pump, driven by the
timing gear train, generates fuel pressures up to 1,800 bar (26,100
psi). Pressurized fuel is delivered to a common rail accumulator mounted
on the cylinder head. The rail supplies six electronically controlled
injectors, each operated by a solenoid or piezo-electric actuator.
The engine control unit (ECU) receives inputs from a crankshaft position
sensor, camshaft position sensor, rail pressure sensor, intake air
temperature sensor, coolant temperature sensor, and accelerator pedal
position sensor. The ECU calculates injection timing, injection
duration, and rail pressure based on these inputs.
Multiple injection events per cycle include pilot injections for
combustion noise reduction, a main injection for power delivery, and
post-injections for exhaust temperature management. The system reduces
particulate matter and black smoke while also lowering nitrogen oxide
emissions compared to mechanical injection systems. A feed pump mounted
on the high-pressure pump draws fuel from the tank through a water
separator and a replaceable cartridge-type fuel filter.
The lubrication system is a forced-feed, full-flow pressurized system
using a gear-type oil pump. The oil pump is mounted externally on the
front timing cover and driven directly by the crankshaft gear. Oil is
drawn from a structural steel oil pan through a suction strainer with a
0.35 mm mesh screen. The oil filter is a spin-on, full-flow type with
synthetic media rated for 15-micron absolute filtration. An integral
bypass valve opens at a differential pressure of 2.0 bar (29 psi) to
maintain flow during cold starts.
A water-cooled plate-type oil cooler is mounted on the side of the
cylinder block, using engine coolant to stabilize oil temperature across
varying loads. Piston cooling is achieved through six nozzle jets, each
calibrated to deliver oil to the underside of each piston crown. The
engine oil capacity including the filter is 28 to 32 L (29.6 to 33.8
qt), dependent on oil pan configuration and chassis inclination
requirements. Operating oil pressure at rated speed is 4.0 to 5.0 bar
(58 to 73 psi). Minimum oil pressure at low idle, at operating
temperature, is 1.0 bar (15 psi).
The cooling system is a sealed, pressurized system with a belt-driven
centrifugal water pump. The water pump uses a ceramic mechanical seal
and a cast iron impeller with backward-curved vanes. The thermostat is a
wax-pellet, dual-stage design with a rated opening temperature of 82°C
(180°F) for the primary stage and a fully open position at 95°C (203°F)
for the secondary stage.
Coolant flow is directed first to the cylinder block, circulating around
the wet liners, then upward through the cylinder head, and finally
through the external oil cooler and EGR cooler before returning to the
radiator. On turbocharged variants, an additional coolant circuit serves
the turbocharger bearing housing. The system uses a pressurized degas
bottle with a 1.0 bar (15 psi) pressure cap. The engine-only coolant
capacity is 24 L (25.4 qt). A coolant filter with a corrosion inhibitor
additive cartridge is standard equipment.
Timing Drive: A front-mounted timing chain drives the overhead camshaft.
The chain is a single-roller type with a hydraulic tensioner and fixed
chain guides. A separate gear train at the front of the engine drives
the high-pressure fuel pump, oil pump, and water pump.
Turbocharger (turbo variant): The turbocharger is a wastegated,
fixed-geometry unit. The wastegate is electronically controlled by the
ECU via a solenoid valve. Maximum boost pressure at rated power is 2.2
bar (32 psi) absolute. The turbocharger bearing housing is water-cooled
and oil-lubricated from the engine’s main oil gallery.
Crankcase Ventilation: A closed crankcase ventilation (CCV) system
routes blow-by gases through a labyrinth-type oil separator. The
separated oil drains back to the oil pan via a one-way reed valve.
Cleaned gases are routed to the turbocharger compressor inlet on
turbocharged variants or to the intake air filter housing on naturally
aspirated variants.
Electrical System: A 24-volt system is standard, using a 50-amp
alternator and a 5.5 kW reduction-gear starter motor. The alternator
provides charging for two 12-volt batteries connected in series. Glow
plugs are metal-type, mounted directly in the combustion chamber. A glow
plug controller provides pre-heating for a maximum of 5 seconds at -10°C
(14°F) and post-heating after start.
Exhaust System: A dry-type exhaust manifold is mounted on the left side
of the cylinder head. On turbocharged variants, the turbocharger mounts
directly to the exhaust manifold outlet. No diesel particulate filter
(DPF) or selective catalytic reduction (SCR) system is fitted to this
pre-2005 engine.
Dry Weight (without fluids, flywheel, starter, alternator): 860 to 920
kg (1,896 to 2,028 lb).
Length (from front fan pulley to rear flywheel housing face): 1,350 mm
(53.1 in).
Width (extreme, including exhaust manifold and injection pump): 780 mm
(30.7 in).
Height (from oil pan rail to rocker cover top): 1,180 mm (46.5 in).
Engine Oil Capacity (with filter): 28 to 32 L (29.6 to 33.8 qt).
Recommended Oil Grade: SAE 15W-40, 10W-30 (API CJ-4 or CI-4).
Coolant Capacity (engine only): 24 L (25.4 qt).
Oil Change Interval (highway truck): 10,000-15,000 km (6,200-9,300
miles) or 250 hours.
Oil Change Interval (construction/stationary): 200 hours.
Fuel Filter Replacement: 15,000 km (9,300 miles) or 200 hours.
Fuel Injector Cleaning: 15,000 to 20,000 km (9,300 to 12,400 miles).
Air Filter Replacement: 30,000 km (18,600 miles).
Intake Valve Clearance (Cold): 0.25 mm (0.010 in).
Exhaust Valve Clearance (Cold): 0.40 mm (0.016 in).
Valve Adjustment Interval: Inspect every 50,000 km (31,000 miles).
Timing Chain Inspection: 100,000 km (62,000 miles).
Fuel Injection Timing: Electronically controlled; no manual adjustment.
Oil Pressure Check (Warm Engine at Rated Speed): 4.0 to 5.0 bar (58 to
73 psi).
Cylinder Head Bolts (M16 x 2.0), Stage 1: 80 Nm (59 lb-ft).
Cylinder Head Bolts (M16 x 2.0), Stage 2: 140 Nm (103 lb-ft).
Connecting Rod Bolts (M12 x 1.25), Stage 1: 50 Nm (37 lb-ft).
Connecting Rod Bolts (M12 x 1.25), Stage 2: 80 Nm (59 lb-ft).
Main Bearing Cap Bolts (M14 x 1.5), Stage 1: 70 Nm (52 lb-ft).
Main Bearing Cap Bolts (M14 x 1.5), Stage 2: 130 Nm (96 lb-ft).
Main Bearing Cross-bolts: 55 Nm (41 lb-ft).
Flywheel Bolts (M12 x 1.25): 120 Nm (89 lb-ft).
Flywheel Housing Bolts (M12 x 1.75): 85 Nm (63 lb-ft).
Camshaft Bearing Cap Bolts (M8 x 1.25): 25 Nm (18 lb-ft).
Injector Clamp Bolts (M8 x 1.0): 22 Nm (16 lb-ft).
Turbocharger Mounting Nuts (M10): 50 Nm (37 lb-ft).
Oil Pump Mounting Bolts (M10 x 1.5): 45 Nm (33 lb-ft).
Water Pump Bolts (M10 x 1.25): 35 Nm (26 lb-ft).
Heavy Trucks: Isuzu Giga CXZ73K3D (dump truck, 6x4 configuration); Isuzu
Giga CYZ73 and CYL73 models (cargo carrier, 6x2 and 6x4 configurations).
Tractor Units: Isuzu Giga EXD73D3XA (tractor, 4x2 configuration with air
suspension) ; Isuzu Giga EXT73 (heavy-duty tractor unit, 6x4
configuration).
Haulage: Isuzu Giga EXZ73 (heavy-duty tractor for container transport).
Specialty Vehicles: Dump trucks (KL-CXZ73K3D); transit mixers; tanker
trucks.
Industrial: Stationary power units for irrigation pumps; heavy
construction equipment (small excavators and wheel loaders repowered
with 6TE1).
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