Saab Z19DTH Specifications
| Engine Model: Saab Z19DTH |
| Engine Type: 4-cycle 4-cylinder DOHC 16-valve turbocharged liquid-cooled diesel |
| Total Displacement: 116.6 cu.in (1.91 L) |
| Rated Engine Power: 150 Hp (110 kW) at 4000 rpm |
| Fuel System Type: Common rail direct injection |
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The Saab Z19DTH is a 1.9-liter, 16-valve turbocharged
diesel engine developed by the Fiat-GM Powertrain joint venture. Introduced in
the mid-2000s, the Z19DTH replaced older Isuzu and Opel-sourced diesel units in
the Saab lineup, offering improved refinement, fuel economy, and tuning
potential.
Marketed under the 1.9 TiD designation in Saab vehicles, the engine features a
cast iron cylinder block, aluminum alloy cylinder head, dual overhead camshafts,
and a Bosch common rail direct injection system with a variable nozzle turbine
(VNT) turbocharger. The Z19DTH was the high-output single-turbo variant within
the Saab diesel range, delivering 150 hp and 320 Nm of torque. It powered the
Saab 9-3 and 9-5 across multiple model years, meeting Euro 4 emissions standards
with diesel particulate filter (DPF) equipment on most variants.
Engine Type: Inline 4-cylinder, 4-cycle, water-cooled, turbocharged diesel.
Displacement: 1,910 cc (116.6 cu.in).
Bore: 82.0 mm (3.23 in).
Stroke: 90.4 mm (3.56 in).
Compression Ratio: 17.5:1.
Firing Order: 1-3-4-2.
Maximum Power Output: 150 hp (110 kW) @ 4,000 rpm.
Maximum Torque Output: 320 Nm (236 lb-ft) @ 2,000-2,750 rpm.
Emission Standard: Euro 4, with Diesel Particulate Filter (DPF).
Valvetrain Configuration: Dual Overhead Camshaft (DOHC) operating 16 valves (4
valves per cylinder). Camshafts are driven by a toothed timing belt. Hydraulic
lash adjusters are incorporated, eliminating routine manual valve clearance
adjustments.
The cylinder block is manufactured from cast iron with
an open-deck design. Bore diameter measures 82.0 mm (3.23 in). The cast iron
construction provides the rigidity required to withstand elevated cylinder
pressures generated by the common rail injection system and turbocharging. The
crankshaft is forged steel with eight counterweights, supported by five main
bearings.
The block incorporates an integrated oil
gallery system feeding the main bearings, connecting rods, and
turbocharger. Pressed-in cast iron cylinder liners are utilized, with
the bores machined to a plateau honed finish. The engine incorporates a
balancer shaft system to reduce secondary vibrations.
The cylinder head is manufactured from aluminum alloy
with cross-flow port architecture and a pent-roof combustion chamber design.
Valves: 16 total; 8 intake, 8 exhaust.
Intake Valve Diameter: 28.5 mm (1.12 in).
Exhaust Valve Diameter: 26.0 mm (1.02 in).
Valve Stem Diameter: 6.0 mm (0.24 in) for both intake and exhaust.
Valve Seat Inserts: Powder metal sintered alloy with multi-angle seat geometry.
Valve Guides: Press-fit sintered iron guides.
Hydraulic Lash Adjusters: Direct-acting units mounted in the cylinder head
casting, operating on bucket-type cam followers. Camshafts: Chilled cast iron
camshafts with induction-hardened lobes. The intake camshaft is equipped with a
variable valve timing system on certain variants. Valve Springs:
Progressive-rate springs designed for diesel engine operating speeds.
Swirl Flaps: The intake manifold incorporates swirl flaps (intake port
deactivation valves) that alter intake port velocity at low engine speeds to
improve combustion efficiency and reduce emissions. The flaps are actuated by a
vacuum-operated control unit.
The fuel system employs Bosch common rail direct
injection with third-generation technology. Injection Type: Direct injection
into the combustion chamber with centrally mounted injectors. Injector
Configuration: Solenoid-actuated injectors with multi-hole nozzles. The system
utilizes up to five injection events per combustion cycle: pilot injection,
pre-injection, main injection, and two post-injection events for DPF
regeneration.
Fuel Pressure: Low-pressure circuit supplies fuel from the in-tank pump at
3.5-4.0 bar (51-58 psi). A high-pressure mechanical pump driven by the timing
belt elevates pressure to a maximum of 1,600 bar (23,206 psi). High-Pressure
Pump: Bosch CP1 or CP3 radial piston pump with a fuel metering valve controlling
rail pressure based on engine demand.
Engine Management System: Bosch EDC16 ECU with integrated boost control,
managing injection timing, rail pressure, glow plug operation, and DPF
regeneration. Fuel Filtration: Spin-on cartridge fuel filter with integrated
water separator and water-in-fuel sensor. Intake Manifold: Composite plastic or
aluminum manifold with integrated swirl flap assembly and electronically
controlled throttle body.
The lubrication system is a full-flow, pressurized
design utilizing a rotor-type oil pump driven by the crankshaft. Oil Pump Type:
Internal gear (gerotor) pump mounted to the front of the crankshaft, housed
within the front timing cover assembly. Oil Capacity: 4.3-4.8 liters (4.5-5.1
qt) including oil filter replacement. Recommended Oil Viscosity: 5W-30 or 5W-40
fully synthetic.
Oil Quality Requirement: ACEA C2 or C3 (low-ash formulation) for DPF-equipped
variants. ACEA B4 for non-DPF variants. Oil Pressure: At warm idle, pressure
ranges from 1.0-1.5 bar (14-22 psi). At 3,000 rpm, pressure reaches 3.5-4.5 bar
(51-65 psi). Oil Cooler: Liquid-to-oil plate-type heat exchanger integrated into
the oil filter housing, utilizing engine coolant for thermal stabilization.
Oil Filter: Cartridge-type filter housed within a modular housing. Crankcase
Ventilation: Closed PCV system with an integrated oil separator incorporated
into the valve cover. Blow-by gases are routed to the turbocharger compressor
inlet.
The cooling system is pressurized and utilizes a
centrifugal water pump driven by the timing belt. Water Pump Type: Centrifugal
pump with a die-cast aluminum housing and stamped steel impeller. Thermostat:
Wax-pellet type with integrated housing. Opening temperature is 82-88 °C
(180-190 °F).
Coolant Capacity: 6.5-7.5 liters (6.9-7.9 qt) inclusive of engine block, heater
core, radiator, and turbocharger cooling circuit. Radiator: Cross-flow aluminum
core with plastic end tanks. Cooling fan configuration consists of dual electric
fans with variable speed control based on coolant temperature, charge air
temperature, and air conditioning load.
System Pressure: Radiator cap rated at 1.1-1.2 bar (16-17 psi). Turbocharger
Cooling: The turbocharger bearing housing is integrated into the engine cooling
circuit. No auxiliary electric water pump is present. Coolant Specification:
Phosphate and silicate-free ethylene glycol-based coolant meeting GM/Fiat
specifications for mixed-metal engine construction.
Timing System: Toothed timing belt constructed from
high-tensile rubber with fiber reinforcement. The belt drives the camshafts,
high-pressure fuel pump, and water pump. An automatic spring-loaded tensioner
maintains belt tension. Replacement interval is 120,000-150,000 km
(75,000-93,000 miles) or 5 years.
Turbocharger System: Garrett variable nozzle turbine (VNT) turbocharger with
water-cooled bearing housing. The VNT mechanism varies turbine inlet geometry to
optimize boost response across the engine speed range. The system is
vacuum-actuated with electronic control via the ECU.
Intercooler: Air-to-air charge air cooler mounted in the front bumper area,
reducing intake air temperature after compression.
Exhaust System: Cast iron exhaust manifold with integrated turbocharger mounting
flange. A Diesel Oxidation Catalyst (DOC) and Diesel Particulate Filter (DPF)
are mounted downstream. The DPF regenerates through post-injection events that
increase exhaust temperatures.
EGR System: Exhaust Gas Recirculation (EGR) valve routes a portion of exhaust
gases to the intake manifold to reduce NOx emissions. The EGR system is
electronically controlled and includes an EGR cooler to reduce intake air
temperatures.
Glow Plugs: Ceramic or steel sheathed glow plugs with rapid heating capability.
Post-heating continues after start to reduce cold start emissions.
Overall Length: 630 mm (24.8 in) measured from
accessory drive pulley face to transmission mounting flange.
Overall Width: 650 mm (25.6 in) inclusive of intake manifold, turbocharger
assembly, and exhaust manifold.
Overall Height: 720 mm (28.3 in) from oil pan bottom surface to valve cover top
surface.
Dry Weight: 145-155 kg (320-342 lb) depending on turbocharger configuration and
accessory drive components.
Valve Clearance: Hydraulic lash adjusters operate
automatically. No periodic adjustment required. Timing Belt Replacement
Interval: 120,000-150,000 km (75,000-93,000 miles) or 5 years. Water pump
replacement is recommended concurrently due to belt-driven configuration. Fuel
Filter Replacement Interval: 30,000 km (18,600 miles) or as indicated by
water-in-fuel sensor.
Engine Oil Change Interval: 10,000-12,000 km (6,200-7,500 miles) or 12 months.
DPF-equipped variants require low-ash oil to prevent DPF clogging. Coolant
Change Interval: 80,000 km (50,000 miles) or 4 years. Glow Plug Replacement
Interval: Replace as required; functional inspection recommended at 80,000 km
(50,000 miles). Idle Speed (warm, neutral): 800-850 rpm.
Injection Timing: Electronically controlled with closed-loop feedback from
oxygen sensors and crankshaft position; no manual adjustment possible. Swirl
Flap Inspection: Swirl flap linkage and mechanism inspection recommended at
60,000 km (37,000 miles). Failure can result in flap ingestion into the engine.
DPF Regeneration: Active regeneration occurs automatically when driving
conditions permit. Frequent short trips may require forced regeneration service.
Cylinder Head Bolts (cold), Step 1: 40 Nm (30 lb-ft).
Cylinder Head Bolts (cold), Step 2: 80 Nm (59 lb-ft).
Crankshaft Damper Pulley Bolt: 180-200 Nm (133-148 lb-ft).
Connecting Rod Cap Bolts: 30 Nm (22 lb-ft).
Main Bearing Cap Bolts: 40 Nm (30 lb-ft).
Camshaft Bearing Cap Bolts: 10-12 Nm (7-9 lb-ft).
Camshaft Sprocket Bolts: 70-80 Nm (52-59 lb-ft).
Valve Cover Bolts: 8-10 Nm (6-7 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: 35-40 Nm (26-30 lb-ft).
Oil Pan Bolts: 10-12 Nm (7-9 lb-ft).
Timing Belt Tensioner Bolt: 20-25 Nm (15-18 lb-ft).
Water Pump Bolts: 18-22 Nm (13-16 lb-ft).
High-Pressure Fuel Pump Mounting Bolts: 20-25 Nm (15-18 lb-ft).
Fuel Injector Clamp Bolts: 25-30 Nm (18-22 lb-ft).
Flywheel / Drive Plate Bolts: 90-100 Nm (66-74 lb-ft).
Engine Mount Bracket Bolts: 45-55 Nm (33-41 lb-ft).
Glow Plugs: 20-25 Nm (15-18 lb-ft).
Saab 9-3 (Sport Sedan, SportCombi, Convertible):
2004-2010 model years. The Z19DTH was marketed as the 1.9 TiD in the 9-3 lineup,
serving as the primary diesel powertrain. The engine was paired with either a
six-speed manual transmission (F40) or a six-speed automatic transmission (Aisin
AW TF-80SC). Both front-wheel-drive and all-wheel-drive (XWD) configurations
were available in certain markets.
Saab 9-5 (YS3E): 2006-2009 model years. The Z19DTH replaced the earlier 2.2 TiD
and 3.0 V6 TiD engines in the 9-5 range. In this application, the engine was
calibrated for the larger sedan platform and paired exclusively with a six-speed
manual transmission. The 9-5 application featured revised engine mounts and
cooling system modifications to accommodate the longitudinal engine orientation.
Opel/Vauxhall Vectra C, Signum, Zafira B: The identical engine was marketed as
1.9 CDTi (150 hp) across Opel and Vauxhall model lines.
Fiat/Alfa Romeo: The same engine architecture was designated 1.9 JTDm in Fiat,
Alfa Romeo, and Lancia applications, with variations in calibration and power
output.
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