Nissan TB45E Specifications
| Engine Model: Nissan TB45E |
| Engine Type: 4-cycle inline 6-cylinder OHV 12-valve liquid-cooled gasoline |
| Total Displacement: 273.3 cu.in (4.47 L) |
| Rated Engine Power: 200 Hp (149 kW) at 4400 rpm |
| Fuel System Type: Multi-point electronic fuel injection |
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The Nissan TB45E is a 4.5-liter, inline-six, naturally
aspirated gasoline engine introduced in 1997 as the successor to the TB42 within
the Nissan Patrol GU (Y61) and Safari platforms. Developed as part of the TB
engine family, this powerplant represents a continuation of Nissan’s commitment
to robust, heavy-duty overhead valve (OHV) architecture optimized for low-end
torque, durability under sustained load, and serviceability in remote
environments.
The TB45E marked the transition from carburetion to electronic multi-point fuel
injection for the TB series, delivering improved fuel efficiency, cold-start
reliability, and emissions compliance without sacrificing the bulletproof
reputation established by its predecessors. The engine achieves its 4.5-liter
displacement through a bore increase relative to the TB42, maintaining the
long-stroke characteristics that favor low-rpm torque production.
Widely regarded as one of the most durable engines fitted to the Nissan Patrol,
the TB45E became a preferred powertrain for heavy towing, overland expeditions,
and extreme off-road applications where mechanical simplicity and thermal
resilience are paramount.
The TB45E is a 4-stroke, inline 6-cylinder, water-cooled gasoline engine
utilizing an overhead valve (OHV) valvetrain configuration with two valves per
cylinder, totaling 12 valves. Total displacement is 4.478 Liters (4,478 cc /
273.3 cu.in), derived from a bore of 99.5 mm (3.917 in) and a stroke of 96.0 mm
(3.780 in). The bore-to-stroke ratio is oversquare, favoring increased valve
area and breathing capacity while maintaining adequate torque characteristics.
The compression ratio is set at 8.5:1, a conservative value selected to
accommodate variations in fuel quality across global markets and to ensure
longevity under high-load conditions.
Maximum power output is 200 HP (149 kW) at 4,400 RPM, with peak torque of 348 Nm
(257 lb-ft) achieved at 3,600 RPM. The redline is calibrated to 5,000 RPM. The
firing order follows 1-5-3-6-2-4, a conventional arrangement for inline-six
engines that provides inherent primary and secondary balance without the need
for balance shafts. The engine management system is a Nissan-designed electronic
control unit (ECU) operating the sequential multi-point fuel injection system.
The cylinder block is constructed from cast iron with a
deep-skirt design that extends below the crankshaft centerline, providing
exceptional rigidity for the rotating assembly under high cylinder pressures and
sustained torque loads. The inline-six configuration naturally offers inherent
balance, eliminating the need for balance shafts while delivering smooth
operation across the entire engine speed range.
The block features a siamese-bore configuration with a finished bore diameter of
99.5 mm (3.917 in). The crankshaft is forged from high-strength steel with
induction-hardened journals and is supported by seven main bearings - a
configuration that minimizes crankshaft deflection under high-load conditions
and contributes to the engine’s reputation for longevity.
Connecting rods are forged steel with a fractured-cap design ensuring precise
bearing alignment. Pistons are cast aluminum with a slipper-skirt design and
feature a slight dish in the crown to achieve the 8.5:1 compression ratio. The
cylinder block incorporates cast-in oil passages dedicated to the hydraulic
valve lifters and the timing chain tensioner.
The cylinder head is manufactured from aluminum alloy,
a material selection that reduces overall engine weight and improves heat
dissipation relative to cast iron. The OHV valvetrain utilizes a camshaft
located within the cylinder block, driven by a timing chain from the crankshaft.
The camshaft operates the valves through hydraulic lifters, pushrods, and rocker
arms arranged in a shaft-mounted configuration.
The valvetrain comprises two valves per cylinder - one intake and one exhaust -
with the valves arranged in a parallel configuration rather than the cross-flow
layout found in overhead cam designs. Intake valve diameter measures 45.0 mm
(1.772 in), while exhaust valve diameter measures 40.0 mm (1.575 in). The
hydraulic lifters (lash adjusters) are self-adjusting, eliminating the need for
manual valve clearance adjustments for the engine’s service life.
The combustion chambers are of the wedge type, machined directly into the
cylinder head casting. The intake manifold is a two-piece aluminum casting with
long runners tuned to enhance low-end torque production, while the exhaust
manifold is a cast-iron log-type design with provisions for the oxygen sensor
and exhaust gas recirculation (EGR) system.
The fuel system is a sequential multi-point electronic
fuel injection (EFI) system, representing a significant advancement over the
carbureted TB42. Fuel is delivered by an in-tank electric pump operating at a
regulated pressure of 2.5-3.0 bar (36-44 psi). The fuel injectors are mounted in
the intake manifold runners, positioned to direct fuel toward the intake valves.
Each injector is actuated sequentially by the engine control unit based on
crankshaft position and camshaft position inputs. The intake air system
incorporates a hot-wire mass airflow sensor (MAF) located upstream of the
throttle body, providing precise air mass measurement for fuel delivery
calculations. The throttle body is cable-actuated and houses a throttle position
sensor (TPS) and an idle air control (IAC) valve that manages cold start and
idle stabilization.
A fuel pressure regulator with a vacuum reference maintains consistent pressure
differential across the injectors. The engine control unit also manages ignition
timing, EGR operation, and evaporative emissions control. The fuel system is
calibrated for operation with unleaded gasoline of 91 octane (RON) or higher.
The lubrication system is a full-flow, pressurized
design utilizing a gear-type oil pump mounted to the front of the crankshaft
within the timing chain cover. The oil pump draws oil from a baffled steel oil
pan through a screened pickup tube and delivers it through a full-flow spin-on
oil filter. Total oil capacity ranges from 6.5 to 7.5 Liters (6.9-7.9 qt)
depending on the oil pan configuration and the presence of the oil cooler.
A water-cooled oil cooler is integrated into the oil filter mounting assembly on
models equipped for heavy-duty or towing applications. The lubrication circuit
supplies oil to the crankshaft main bearings, connecting rod bearings, camshaft
bearings, hydraulic lifters, and timing chain tensioner.
Oil pressure at operating temperature ranges from 2.5-4.5 bar (36-65 psi) across
the normal engine speed range, with a relief valve set to 5.0 bar (73 psi) to
prevent over-pressurization during cold starts. The recommended oil viscosity is
10W-30 or 10W-40 meeting API SG or higher specifications, with a preference for
formulations containing adequate zinc-based anti-wear additives to protect the
flat-tappet hydraulic lifters and camshaft.
The cooling system is a water-cooled, pressurized
design utilizing a belt-driven centrifugal water pump mounted to the front of
the cylinder block. Coolant circulates through the cast-iron block and aluminum
cylinder head, with a cross-flow aluminum radiator employed in all applications.
The thermostat is a wax-pellet unit with an opening temperature of 82°C (180°F),
achieving full open at 95°C (203°F). Total coolant capacity ranges from
11.0-12.5 Liters (11.6-13.2 qt) depending on vehicle platform, heater core
configuration, and the presence of an auxiliary rear heater in wagon and bus
applications.
A viscous clutch-driven cooling fan is standard, providing proportional cooling
airflow based on engine temperature and load. In heavy-duty applications such as
the Nissan Civilian bus, an auxiliary electric fan is added to supplement
cooling during stationary operation or low-speed high-load conditions. The
cooling system is designed with significant reserve capacity to accommodate the
thermal loads associated with towing and off-road operation at low vehicle
speeds.
The ignition system is a distributor-less design with
individual ignition coils mounted directly above each spark plug (coil-on-plug).
The engine control unit calculates ignition timing based on inputs from the
crankshaft position sensor, camshaft position sensor, mass airflow sensor, and
knock sensor. The knock sensor, mounted on the cylinder block, allows the ECU to
adjust timing to prevent detonation when lower-octane fuel is used. Spark plugs
are NGK BKR5E or equivalent, with a gap of 1.0-1.1 mm (0.039-0.043 in).
Timing System: The camshaft is driven by a single-row
roller timing chain from the crankshaft. The chain is located at the front of
the engine and operates within an oil bath environment. An automatic hydraulic
tensioner supplied by the engine lubrication system maintains consistent chain
tension throughout the service life. The timing chain is designed for the
engine’s service life under normal operating conditions, with no mandatory
replacement interval. The timing cover is a die-cast aluminum component that
houses the chain, tensioner, and oil pump assembly.
Exhaust Gas Recirculation (EGR) System: An EGR system is employed to reduce
nitrogen oxide (NOx) emissions. The EGR valve is vacuum-actuated under
electronic control, routing a portion of exhaust gases from the exhaust manifold
to the intake plenum through a steel tube. The system is monitored by the engine
control unit through the oxygen sensor and EGR position sensor to ensure proper
operation and emissions compliance.
Crankcase Ventilation: A closed positive crankcase ventilation (PCV) system
routes blow-by gases from the crankcase to the intake manifold through a PCV
valve. The system incorporates an oil separator within the camshaft cover to
prevent liquid oil from entering the intake tract.
Length measured from the front accessory drive face to
the transmission mounting flange is 920 mm (36.2 in). Width across the cylinder
head, intake manifold, and exhaust manifold measures 580 mm (22.8 in). Height
from the oil pan bottom surface to the top of the valve cover is 750 mm (29.5
in). The dry weight of the fully dressed engine - including the intake manifold,
exhaust manifolds, fuel system, ignition system, and accessory drives - is 245
kg (540 lbs).
Engine oil and filter changes are recommended at
5,000-7,500 km (3,000-4,500 miles) under severe-duty conditions such as towing
or off-road operation, and up to 10,000 km (6,200 miles) under normal highway
driving. Valve clearance inspection is not required due to the hydraulic lifter
system.
The timing chain does not have a mandatory replacement interval but should be
inspected for elongation and tensioner wear at 100,000 km (60,000 mile)
intervals. Spark plug replacement is recommended at 40,000 km (25,000 miles) for
standard plugs; the coil-on-plug ignition system components are durable but
should be inspected for oil contamination from valve cover gasket leaks. The
fuel filter is an in-line unit and should be replaced at 40,000 km (25,000 mile)
intervals.
Coolant replacement is specified at 40,000 km (25,000 miles) or 24 months. The
EGR system and throttle body should be inspected for carbon accumulation at
60,000 km (37,000 mile) intervals, particularly in vehicles used for low-speed
urban operation. Compression pressure should be consistent across all six
cylinders, with a standard value of 1.2-1.4 MPa (174-203 psi) and a minimum
service limit of 1.0 MPa (145 psi) with maximum variation between cylinders of
0.1 MPa (15 psi).
Cylinder Head Bolts (Cold), Step 1: 30 Nm (22 lb-ft).
Cylinder Head Bolts (Cold), Step 2: 60 Nm (44 lb-ft).
Cylinder Head Bolts (Cold), Step 3: 90 Nm (66 lb-ft).
Main Bearing Cap Bolts: 80-90 Nm (59-66 lb-ft).
Connecting Rod Cap Bolts: 50-55 Nm (37-41 lb-ft).
Crankshaft Damper Pulley Bolt: 300-330 Nm (221-243 lb-ft).
Camshaft Thrust Plate Bolts: 20-25 Nm (15-18 lb-ft).
Camshaft Sprocket Bolt: 100-110 Nm (74-81 lb-ft).
Rocker Arm Shaft Bolts: 30-35 Nm (22-26 lb-ft).
Valve Cover Bolts: 8-10 Nm (71-89 lb-in).
Intake Manifold Bolts: 20-25 Nm (15-18 lb-ft).
Exhaust Manifold Nuts: 25-30 Nm (18-22 lb-ft).
Oil Pan Bolts: 10-12 Nm (7-9 lb-ft).
Water Pump Bolts: 20-25 Nm (15-18 lb-ft).
Flywheel / Drive Plate Bolts: 100-110 Nm (74-81 lb-ft).
Timing Chain Tensioner Bolts: 20-25 Nm (15-18 lb-ft).
Timing Chain Guide Bolts: 20-25 Nm (15-18 lb-ft).
Engine Mount Bracket Bolts: 55-65 Nm (41-48 lb-ft).
The Nissan TB45E engine served as the primary gasoline
powertrain for a range of Nissan heavy-duty vehicles and commercial platforms
throughout its production period from 1997 to 2004.
Nissan Patrol (GU / Y61): The TB45E powered the flagship off-road SUV in global
markets from 1997 through 2001, before being superseded by the larger TB48DE in
certain markets. The engine was offered in both wagon and cab-chassis
configurations, valued for its durability in remote-area applications.
Nissan Safari (Y61): The Japanese Domestic Market variant of the Patrol received
the TB45E as its top-displacement gasoline engine, distinguished by compliance
with Japanese emissions regulations and the inclusion of the hydraulic engine
cooling fan.
Nissan Civilian (W41 Bus): The light-duty bus platform utilized the TB45E from
1999 to 2004, where the engine’s low-end torque characteristics and thermal
management capacity were well-suited to the demands of urban transit and school
bus applications. The Civilian variant incorporated an enlarged cooling system
and auxiliary electric fan to accommodate stationary operation.
Nissan Patrol Pickup (GU): Commercial variants of the Patrol platform, including
single-cab and dual-cab pickup configurations, received the TB45E in markets
where gasoline power was preferred over diesel, particularly in the Middle East
and Africa.
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