International DT360 Specifications
| Engine Model: Navistar International DT360 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 360 cu.in (5.9 L) |
| Rated Engine Power: 160-210 Hp (119-157 kW) at 2700 rpm |
| Aspiration Type: Naturally aspirated or Turbocharged |
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The International DT360 is a highly respected
medium-duty inline-six diesel engine produced by Navistar (International
Harvester’s successor). As part of the DTA/DT series, the DT360 earned a
reputation for exceptional durability, ease of maintenance, and long
service life in demanding commercial, agricultural, and industrial
environments.
Unlike many modern engines, the DT360 features
a mechanical fuel-injection system, wet-sleeve cylinder liners, a
gear-driven valvetrain, and a conservative engineering design that
allows it to operate reliably for tens of thousands of hours with proper
care.
The DT360 shares much of its engineering philosophy with the larger
DT466, including modular construction, replaceable wet liners, and
excellent rebuildability. It is widely used in medium-duty trucks,
buses, construction equipment, generators, and agricultural machinery
where torque, simplicity, and reliability are critical. Mechanics value
the DT360 for its service accessibility, robust bottom end, and
resistance to overheating under heavy load.
The DT360 is a four-stroke, water-cooled, inline six-cylinder diesel
engine. Displacement is 5,900 cc (360 cubic inches). The bore measures
102 mm (4.01 inches), and the stroke is 120 mm (4.75 inches), forming a
long-stroke configuration that provides strong low-end torque and
efficient fuel consumption. Compression ratio varies slightly by
application but ranges between 16.5:1 and 17.0:1.
Power output depends on calibration:
- Naturally aspirated: 160-180 Hp (119-134 kW) at 2,600-2,800 rpm
- Turbocharged versions: 185-210 Hp (138-157 kW) at 2,600-2,800 rpm
Peak torque ranges from 580-650 Nm (428-479 lb-ft) at approximately
1,400-1,600 rpm. Idle speed averages 650-750 rpm, with governed maximum
speed generally between 2,600 and 2,800 rpm depending on application.
Firing order is 1-4-2-6-3-5.
The crankshaft is forged steel, fully counterweighted, and supported by
seven main bearings for optimal strength and vibration control. Pistons
are cast aluminum alloy with reinforced crowns and precision machined
bowls. The piston ring set includes two compression rings and one
oil-control ring. Connecting rods are forged steel with replaceable
big-end inserts. The camshaft is mounted in the block and fully
gear-driven for lifetime timing accuracy without belt maintenance.
The DT360 features a heavy-duty cast-iron block with replaceable
wet-sleeve cylinders, allowing for complete in-frame overhauls without
machining. The block design includes deep webs, thick main bearing
saddles, and optimally placed coolant passages that maintain consistent
cylinder temperatures.
The wet-sleeve design improves cooling and provides long engine life,
even under extreme thermal load. The crankcase structure is reinforced
to handle high torque output and sustained commercial workloads.
The cylinder head is cast iron with a crossflow layout to maximize
breathing efficiency. Depending on the version, the engine may utilize
two or four valves per cylinder, though common DT360 configurations use
two valves per cylinder. The valvetrain consists of pushrods and rocker
arms actuated by the block-mounted camshaft through a gear train.
Valve clearances (cold):
- Intake: 0.25-0.30 mm (0.010-0.012 in)
- Exhaust: 0.30-0.36 mm (0.012-0.014 in)
Valve seats are hardened for durability. The head gasket incorporates
fire rings to maintain combustion sealing under high cylinder pressures.
The DT360 uses a fully mechanical direct-injection fuel system. A
mechanical lift pump draws fuel from the tank and routes it through a
primary water separator and a fine-element fuel filter. The engine
commonly uses a Bosch inline-type mechanical injection pump with
mechanical governor control. Some variants use a rotary pump depending
on market and configuration.
Injection pressures range between 250 and 350 bar. Multi-hole
direct-injection nozzles atomize fuel directly into the combustion bowl.
Injection timing is mechanically adjustable and must be accurately set
during major service.
Fuel system maintenance:
- Fuel-filter replacement: every 10,000-15,000 km or 250-300 hours
- Injector servicing: every 40,000-60,000 km or 1,000-1,500 hours
- Pump timing checks: major service intervals
- Water separator draining: as required
The lubrication system is a full-pressure wet-sump system. A gear-driven
oil pump delivers oil through a full-flow filter before supplying the
main gallery. Lubrication targets include main bearings, rod bearings,
camshaft bearings, rocker assemblies, turbocharger bearings (if
equipped), and valve components.
Oil capacity ranges from 15 to 17 liters (15.8-18.0 US quarts). Normal
oil pressure is 300-450 kPa (44-65 psi) at rated speed and 100-150 kPa
(15-22 psi) at idle. Recommended oil is SAE 15W-40 or 20W-50 diesel oil
meeting API CF or higher.
The oil change intervals:
- Automotive and truck use: 5,000-7,500 km
- Industrial applications: 200-250 hours
Cooling is provided by a closed-loop, forced-circulation liquid system.
A belt-driven centrifugal water pump circulates coolant through the
block, wet sleeves, and head. A thermostat begins opening at 82°C
(180°F) and fully opens near 95°C (203°F). Cooling capacity ranges from
18 to 22 liters (19.0-23.2 US quarts). System pressure is maintained by
a radiator cap rated between 70 and 90 kPa (10-13 psi).
Many turbocharged DT360 units include enhanced cooling features such as
oil coolers, higher-capacity radiators, and improved coolant passages.
| Intake and Exhaust Systems |
Air intake systems vary by application:
- Trucks use dry-element paper filters
- Industrial applications may use oil-bath or cyclone pre-cleaners
The intake manifold is either cast aluminum or cast iron depending on
variant. Turbocharged models use a compressor driven by exhaust energy.
Some versions include an intercooler to cool intake air for improved
torque and efficiency.
The exhaust manifold is cast iron and designed to withstand repeated
heat cycling. Turbocharged engines mount the turbo directly to the
manifold.
Electrical system configurations include:
- 12-volt systems for trucks and some industrial equipment
- 24-volt systems for heavy industrial or specialty applications
Alternators provide 55-90 amperes. Starter motors range from 3.0 to 4.0
kW. Cold-start aids include glow plugs or grid heaters depending on
configuration.
Depending on installation, the DT360 can
support:
- hydraulic pumps
- air compressors
- power-steering pumps
- PTO (power take-off) drives
- belt-driven auxiliary equipment
- generator heads
- Length: 980-1,050 mm (38.6-41.3 in)
- Width: 720-780 mm (28.3-30.7 in)
- Height: 900-980 mm (35.4-38.6 in)
Dry weight generally ranges from 570 to 640 kg (1,257-1,410 lbs)
depending on accessories and turbocharging.
- Oil and filter: every 5,000-7,500 km or 200-250 hours
- Fuel filters: 10,000-15,000 km or 250-300 hours
- Air filter: inspect every 50 hours; replace as required
- Coolant replacement: every 2 years
- Valve-lash adjustment: every 15,000-20,000 km
- Injector service: every 40,000-60,000 km
- Compression testing: every 100,000 km
- Drive belt inspection: every 100 hours or each service interval
- Cylinder head bolts: 200-220 Nm (148-162 lb-ft)
- Main bearing caps: 190-210 Nm (140-155 lb-ft)
- Connecting-rod bolts: 90-110 Nm (66-81 lb-ft)
- Flywheel bolts: 180-200 Nm (133-148 lb-ft)
- Crankshaft pulley bolt: 350-380 Nm (258-280 lb-ft)
- Oil drain plug: 40-55 Nm (30-41 lb-ft)
- Injector hold-downs: 25-30 Nm (18-22 lb-ft)
The Navistar DT360 engine is widely used
in:
- International medium-duty trucks (S-Series, 4000-Series)
- School buses
- Construction loaders and telehandlers
- Agricultural tractors and power units
- Industrial generators
- Municipal and fleet vehicles
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