Isuzu G200 Specifications
| Engine Model: Isuzu G200 |
| Engine Type: 4-stroke in-line 4-cylinder 8-valve liquid-cooled gasoline |
| Total Displacement: 118.9 cu.in (1.95 L) |
| Rated Engine Power: 82-135 Hp (61-101 kW) at 5600 rpm |
| Fuel System Type: Carburetor or Electronic fuel injection |
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The Isuzu G200 is a 2.0-liter inline-four
gasoline engine belonging to the Isuzu G-series engine family, produced
from the early 1980s through the mid-1980s. This powerplant was offered
in two valvetrain configurations: the SOHC G200Z with a chain-driven
single overhead camshaft and the DOHC G200W with a chain-driven dual
overhead camshaft arrangement. The G200 was engineered as a durable,
serviceable engine for Isuzu’s light truck and SUV platforms,
prioritizing reliability and low-end torque over high-rpm power output.
The engine’s architecture features a cast iron cylinder block with an
aluminum alloy cylinder head, a combination providing thermal stability
and reduced mass. The timing chain drive - rather than a belt -
contributes to the engine’s longevity, with the chain designed to last
the engine’s service life under proper lubrication conditions.
The G200 was offered with a two-barrel carburetor on most markets, with
multi-point electronic fuel injection available in Japan and the United
States for the Piazza/Impulse coupe. The DOHC G200W variant produced 101
kW (135 hp), representing the performance-oriented configuration. This
engine served as the powerplant for the first-generation Isuzu Trooper,
Isuzu P’UP, Chevrolet LUV, and the sporty Isuzu Piazza.
The G200 is a four-stroke, water-cooled, naturally aspirated gasoline
engine configured for longitudinal mounting in rear-wheel-drive and
four-wheel-drive vehicle architectures. The engine utilizes a two-barrel
carburetor or multi-point electronic fuel injection depending on market
and application.
Engine Type: Inline-4, 4-cycle, water-cooled, naturally aspirated
Displacement: 1,949 cc (118.9 cu.in)
Bore: 87.0 mm (3.43 in)
Stroke: 82.0 mm (3.23 in)
Compression Ratio: 8.5:1 (carbureted)
Compression Ratio: 8.8:1 to 9.0:1 (EFI and DOHC)
Firing Order: 1-3-4-2
Valvetrain: SOHC (G200Z) or DOHC (G200W), 8-valve
Maximum Power (Carb SOHC): 61-64 kW (82-86 hp) at 4,600 rpm
Maximum Power (EFI SOHC): 67-82 kW (90-110 hp) at 5,200-5,600 rpm
Maximum Power (DOHC G200W): 101 kW (135 hp) at 5,800 rpm
Maximum Torque (Carb): 137-147 Nm (101-108 lb-ft) at 3,000 rpm
Maximum Torque (EFI): 152-167 Nm (112-123 lb-ft) at 3,000-3,500 rpm
The cylinder block is manufactured from gray cast iron using a
high-pressure die-casting process, selected for its dimensional
stability, wear resistance, and ability to withstand sustained high-load
operation in truck and SUV applications. The block features a deep-skirt
design extending below the crankshaft centerline, providing a rigid
foundation for the rotating assembly.
The cylinder bores are machined directly into the iron casting with a
plateau-honed finish optimized for the cast iron piston ring packs. The
block incorporates a siamesed bore configuration where adjacent
cylinders share common walls, increasing structural rigidity and
reducing overall engine length. Water jackets surround each cylinder
bore, with coolant flow directed from the water pump into the block
before rising into the cylinder head.
The crankcase incorporates five main bearing supports with the bearing
webs integrated into the block casting. Main bearing caps are
manufactured from cast iron and secured with two bolts per cap. The
block includes mounting provisions for the fuel pump (mechanical on
carbureted variants) and the oil filter housing. A stamped steel or cast
aluminum oil pan is bolted to the lower crankcase flange.
Block Material: Gray cast iron
Bore Diameter: 87.0 mm (3.43 in)
Cylinder Configuration: Inline, siamesed bores
Main Bearing Quantity: 5
Main Bearing Cap Design: Cast iron, two-bolt attachment
The cylinder head is constructed from aluminum alloy using a permanent
mold casting process, selected for its thermal conductivity and reduced
mass relative to cast iron. The cross-flow or parallel-flow port
configuration varies between SOHC and DOHC variants. The chain-driven
valvetrain operates eight valves - two per cylinder.
G200Z SOHC: The single camshaft is located in the cylinder head and
driven by a timing chain from the crankshaft. The camshaft acts directly
on bucket-type tappets or through rocker arms depending on production
variant. Valve clearance adjustment is performed manually using shims or
adjusting screws. The camshaft is supported in bearing journals machined
directly into the cylinder head casting.
G200W DOHC: The dual camshafts - one for intake valves and one for
exhaust valves - are located in the cylinder head and driven by a timing
chain from the crankshaft. A small secondary chain or gear drive
transfers motion between the two camshafts. The camshafts act on
bucket-type tappets, with valve clearance adjusted via shims placed
between the camshaft lobe and the tappet.
The combustion chambers are of a wedge or pent-roof design depending on
valvetrain configuration. The cylinder head incorporates pressed-in
valve seat inserts, with exhaust seats manufactured from a nickel-based
alloy. Valve guides are pressed into the head. SOHC variants utilize a
single chain drive with an automatic or manual tensioner.
Head Material: Aluminum alloy
Valve Configuration: SOHC (G200Z) or DOHC (G200W), 8-valve (2 per
cylinder)
Intake Valve Diameter: 42.0 mm (1.65 in)
Exhaust Valve Diameter: 35.0 mm (1.38 in)
Valve Stem Diameter: 8.0 mm (0.31 in)
Valve Seat Angle: 45 degrees
Camshaft Drive: Timing chain (simplex or duplex) with tensioner
Valve Clearance (Cold, Intake, SOHC): 0.20 mm (0.008 in)
Valve Clearance (Cold, Exhaust, SOHC): 0.25 mm (0.010 in)
Interference Engine: No - valve-to-piston clearance generally maintained
The fuel system configuration varies between carbureted and electronic
fuel injection variants, reflecting the G200’s production across the
transition from mechanical to electronic fuel management.
Carbureted variants utilize a two-barrel downdraft carburetor
manufactured by Aisan or Nikki, depending on production source. The
carburetor incorporates an automatic choke, fast idle cam, accelerator
pump, and power valve for enrichment under high-load conditions. A
mechanical fuel pump mounted on the cylinder block draws fuel from the
tank and delivers it to the carburetor float chamber at regulated
pressure.
EFI variants employ multi-point electronic fuel injection (Isuzu I-TEC
system) with individual injectors positioned in the intake manifold
runners. An in-tank electric fuel pump supplies fuel at regulated
pressure maintained by a vacuum-referenced pressure regulator. The
engine control unit calculates injector pulse width based on inputs from
the mass air flow (MAF) sensor or manifold absolute pressure (MAP)
sensor, crankshaft position sensor, throttle position sensor, coolant
temperature sensor, and oxygen sensor.
Injection Type (Carbureted): Two-barrel downdraft carburetor (Aisan or
Nikki)
Injection Type (EFI): Sequential or batch-fire multi-point fuel
injection (I-TEC)
Fuel Pressure (EFI): 250-280 kPa (36-41 psi) with vacuum line
disconnected
Fuel Requirement: 91 octane (RON) regular unleaded
The lubrication system is a fully pressurized, wet-sump design with a
gear-type oil pump mounted internally within the timing case or oil pan
and driven by the crankshaft. The oil pump utilizes a pair of meshing
gears to generate flow with positive displacement characteristics.
Oil is drawn from the stamped steel or cast aluminum oil pan through a
mesh strainer positioned at the sump’s lowest point. Pressurized oil
passes through a full-flow, replaceable oil filter mounted externally on
the cylinder block. The filter incorporates a bypass valve that permits
oil flow to continue if the filter element becomes restricted. From the
filter, oil enters the main oil gallery cast longitudinally through the
cylinder block, supplying the crankshaft main bearings, connecting rod
bearings, camshaft bearings, and rocker arm or tappet assemblies.
A pressure relief valve bypasses excess oil flow back to the oil pan
when system pressure exceeds the calibrated limit. An oil pressure
switch illuminates a warning indicator or gauge if pressure falls below
the specified minimum.
Oil Type: Engine oil meeting API SF, SG, or higher; SAE 10W-30 or 10W-40
Oil Capacity (with filter): 4.0-4.5 L (4.2-4.8 US qt)
Oil Pressure (at idle, warm): 70-100 kPa (10-15 psi)
Oil Pressure (at 3,000 rpm): 300-400 kPa (44-58 psi)
Oil Pump Type: Gear-type, crankshaft-driven
The cooling system is a pressurized, liquid-cooled design with a
belt-driven centrifugal water pump mounted on the front of the cylinder
block. The water pump impeller circulates coolant through the cylinder
block water jackets, cylinder head passages, heater core, and radiator.
A wax-pellet thermostat mounted in a housing on the cylinder head outlet
or water pump inlet regulates coolant flow to the radiator. The
thermostat begins opening at a calibrated temperature and achieves full
opening within a defined temperature range. A bypass circuit permits
coolant circulation within the engine during warm-up, bypassing the
radiator until the thermostat opens.
The radiator is a down-flow or cross-flow copper-brass or
aluminum-plastic construction depending on vehicle application. An
engine-driven fan with a viscous clutch or a fixed-blade fan provides
forced airflow through the radiator. The cooling system incorporates an
expansion tank with a pressure-rated cap.
Coolant Type: Ethylene-glycol based antifreeze
Coolant Capacity: 8.0-9.0 L (8.5-9.5 US qt)
Thermostat Opening Temperature: 82-88 °C (180-190 °F)
Radiator Cap Pressure: 90-110 kPa (13-16 psi)
Water Pump Type: Centrifugal, belt-driven
Ignition System: The G200 employs a distributor-based ignition system.
The distributor is driven by a gear on the camshaft or by an auxiliary
shaft. Early variants utilize breaker points (contact points) with a
mechanical centrifugal advance and vacuum advance unit. Later variants
incorporate a breakerless electronic ignition system with a magnetic
pickup (reluctor) and external ignition module. The distributor houses
the rotor and cap, distributing high-voltage pulses to each spark plug
through spark plug wires.
Intake System: The intake system incorporates a paper-element air
cleaner. Filtered air passes through the carburetor (on carbureted
variants) or the throttle body (on EFI variants). The intake manifold is
a cast aluminum or composite plastic design with equal-length or tuned
runners.
Exhaust System: The exhaust manifold is a cast iron single-piece design
collecting exhaust gases from all four cylinders into a single downpipe.
The exhaust system incorporates a single exhaust pipe and a muffler.
Catalytic converters are fitted on vehicles destined for markets with
emissions regulations requiring such devices.
Timing Drive: The camshaft is driven by a timing chain from the
crankshaft. The chain is a simplex or duplex roller type, running on
sprockets at the crankshaft and camshaft. A spring-loaded or
oil-pressure-actuated chain tensioner maintains correct chain tension.
The timing chain is designed to last the engine’s service life with
proper lubrication, requiring no scheduled replacement.
Overall Length: 620 mm (24.4 in)
Overall Width: 590 mm (23.2 in)
Overall Height: 680 mm (26.8 in)
Dry Weight (complete engine): 135 kg (298 lb)
Engine Oil Change: 5,000 km (3,100 mi) or 6 months.
Engine Oil Filter Change: At every oil change.
Timing Chain: Inspection for noise and stretch.
Spark Plug Replacement: 20,000 km (12,400 mi) for standard plugs.
Spark Plug Replacement: 40,000 km (25,000 mi) for platinum plugs.
Spark Plug Type: NGK BPR5ES or equivalent.
Spark Plug Gap: 0.8-0.9 mm (0.031-0.035 in).
Ignition Points Replacement (breaker systems): 10,000 km (6,200 mi).
Coolant Replacement: 40,000 km (25,000 mi) or 2 years.
Drive Belts (Accessory) Inspection: Every 15,000 km (9,300 mi).
Air Filter Replacement: 30,000 km (18,600 mi) or as indicated.
Fuel Filter Replacement: 40,000 km (25,000 mi).
Carburetor Adjustment: As required for idle speed and mixture
compliance.
Valve Clearance Adjustment: Every 20,000-30,000 km (12,400-18,600 mi).
Cylinder Head Bolts (M12 x 1.25), 1st pass: 40 Nm (30 lb-ft)
Cylinder Head Bolts (M12 x 1.25), 2nd pass: 80 Nm (59 lb-ft)
Cylinder Head Bolts (M12 x 1.25), Final pass: 100-110 Nm (74-81 lb-ft)
Main Bearing Cap Bolts (M10 x 1.25), 1st pass: 30 Nm (22 lb-ft)
Main Bearing Cap Bolts (M10 x 1.25), Final pass: 70-80 Nm (52-59 lb-ft)
Connecting Rod Cap Bolts (M9 x 1.0), 1st pass: 20 Nm (15 lb-ft)
Connecting Rod Cap Bolts (M9 x 1.0), Final pass: 45-50 Nm (33-37 lb-ft)
Camshaft Bearing Cap Bolts (M8 x 1.25): 20-25 Nm (15-18 lb-ft)
Intake Manifold Bolts (M8 x 1.25): 20-25 Nm (15-18 lb-ft)
Exhaust Manifold Nuts (M8 x 1.25): 25-30 Nm (18-22 lb-ft)
Spark Plugs: 20-25 Nm (15-18 lb-ft)
Oil Pan Bolts (M6 x 1.0): 10-12 Nm (89-106 lb-in)
Water Pump Bolts (M8 x 1.25): 20-25 Nm (15-18 lb-ft)
Crankshaft Pulley Bolt (M16 x 1.5), 1st pass: 100 Nm (74 lb-ft)
Crankshaft Pulley Bolt (M16 x 1.5), Final pass: 140-160 Nm (103-118
lb-ft)
Flywheel / Drive Plate Bolts (M10 x 1.25): 65-75 Nm (48-55 lb-ft)
The Isuzu G200 engine was deployed across a range of Isuzu vehicles and
their GM-branded derivatives, with production concentrated in the early
to mid-1980s.
Isuzu Trooper / Holden Jackaroo (first generation): 1981-1985 model
years. The G200Z SOHC variant served as the base gasoline engine for the
first-generation Trooper (UBS) in export markets, including Australia
(as the Holden Jackaroo) and Europe. This application utilized a
carbureted engine producing 61-64 kW (82-86 hp) and was paired with a
four-speed or five-speed manual transmission.
Isuzu Piazza / Impulse (JT190/JT191): 1981-1984 model years. The G200W
DOHC variant was offered in the Piazza coupe (sold as the Isuzu Impulse
in North America) as the performance engine option. The DOHC engine
produced 101 kW (135 hp) and was equipped with multi-point electronic
fuel injection in Japanese and select export markets. This application
represented the highest power output for the G200.
Isuzu P’UP / Isuzu Faster: The G200Z SOHC was offered in the P’UP (KBD)
compact pickup truck as the gasoline engine option, positioned alongside
diesel variants. This application utilized a carbureted engine
calibrated for truck duty cycles with emphasis on low-end torque.
Chevrolet LUV: The G200 was installed in the Chevrolet LUV (Light
Utility Vehicle), a rebadged version of the Isuzu P’UP sold in North
America through GM dealerships. The engine was marketed under Chevrolet
branding but retained Isuzu engineering.
GMC S-15 (under code LR1): Select early production of the GMC S-15
compact pickup received the Isuzu G200 engine as the base powertrain
before GM’s own 2.0-liter engine became available. This application used
the SOHC carbureted variant.
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