Nissan TB48DE Specifications
| Engine Model: Nissan TB48DE |
| Engine Type: 4-cycle inline 6-cylinder DOHC 24-valve liquid-cooled gasoline |
| Total Displacement: 290 cu.in (4.76 L) |
| Rated Engine Power: 280 Hp (209 kW) at 4800 rpm |
| Fuel System Type: Multi-point electronic fuel injection |
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The Nissan TB48DE is a 4.8-liter inline-six gasoline
engine introduced in 2001 as the flagship powerplant for the GU/Y61 Nissan
Patrol and its Japanese-market counterpart, the Nissan Safari. It represented a
significant technological advancement over its predecessor, the pushrod TB45E,
adopting a double overhead camshaft (DOHC) cylinder head with four valves per
cylinder and variable intake valve timing (VTC). The engine became renowned for
its robust construction, featuring a cast iron block and a forged steel
crankshaft, which enabled exceptional durability under sustained high-load
operation.
The TB48DE gained particular fame in the Middle East, where its combination of
displacement, structural rigidity, and aftermarket support made it a preferred
platform for high-performance builds, frequently modified with forced induction
to achieve outputs exceeding 1,000 hp. In its factory configuration, the engine
delivered linear power delivery and substantial low-end torque suited to heavy
off-road applications and long-distance touring.
Engine Type: 4-stroke, inline 6-cylinder, water-cooled gasoline engine.
Displacement: 4,759 cc (4.8 L; 290 cu.in).
Bore: 99.5 mm (3.917 in).
Stroke: 102.0 mm (4.016 in).
Compression Ratio: 9.0:1.
Firing Order: 1-5-3-6-2-4.
Aspiration: Naturally aspirated.
Maximum Power: 209 kW (280 hp; 284 PS) at 4,800 rpm.
Maximum Torque: 420 Nm (310 lb-ft) at 3,600 rpm.
Redline: 5,500 rpm (governed).
Maximum Engine Speed (momentary): 6,000 rpm.
Compression Pressure
Standard: 1.45-1.60 MPa (210-232 psi).
Minimum service limit: 1.20 MPa (174 psi).
Maximum permissible variation between cylinders: 0.10 MPa (15 psi).
Combustion Chamber: Pent-roof design with central spark plug location.
Valvetrain: DOHC (double overhead camshaft), 4 valves per cylinder, 24 valves
total, chain-driven camshafts with VTC (Variable Timing Control) on intake
camshaft.
The cylinder block is constructed from high-strength
gray cast iron with a closed-deck design, providing exceptional rigidity for the
reciprocating assembly. The block features a deep-skirt configuration with the
cylinder walls extending below the crankshaft centerline, minimizing flex under
high cylinder pressures. Seven main bearings support the forged steel
crankshaft, with bearing caps secured by four vertical bolts each to distribute
clamping force across the wide bearing webs. The cylinders are cast directly
into the block without replaceable liners, finished with a plateau honing
process that produces a surface finish optimized for the cast aluminum pistons.
The block incorporates a structural oil pan mounting flange with additional
ribbing to reduce vibration transmission. Cast-in coolant passages surround each
cylinder for the full depth of the stroke, with a water jacket that extends the
height of the block to provide uniform cooling of the combustion chamber
surfaces. The cylinder bore spacing is 113.0 mm (4.449 in), allowing adequate
material thickness between cylinders for heat dissipation and structural
integrity.
The cylinder head is manufactured from aluminum alloy
with a cross-flow design positioning intake ports on the passenger side and
exhaust ports on the driver side for longitudinal engine mounting. The head
features pent-roof combustion chambers with centrally located spark plugs to
optimize flame propagation. Dual overhead camshafts are supported by seven
bearing journals each, with the intake camshaft incorporating the VTC mechanism
that allows continuously variable adjustment of intake valve timing up to 35
degrees of crankshaft rotation.
The camshafts are driven by a silent chain system from the crankshaft, with a
hydraulic chain tensioner maintaining optimal tension throughout the engine’s
service life. Valve actuation occurs through bucket-type tappets with shim
adjustment, providing a rigid valvetrain suited to sustained high-rpm operation.
The intake ports are designed with a high-swirl geometry to promote fuel
atomization and mixture motion within the cylinder.
Number of Valves: 24 total (4 per cylinder).
Intake Valve Diameter: 35.0 mm (1.378 in).
Exhaust Valve Diameter: 31.0 mm (1.220 in).
Valve Stem Diameter: 6.0 mm (0.236 in) for both intake and exhaust.
Valve Seat Inserts: Powder metal inserts for both intake and exhaust; exhaust
seats feature nickel-based alloy for high-temperature durability.
Valve Clearance: Shim adjustment under bucket; clearance measured with engine
cold.
Intake Valve Clearance (cold): 0.24-0.32 mm (0.009-0.013 in).
Exhaust Valve Clearance (cold): 0.26-0.34 mm (0.010-0.013 in).
Valve Timing (nominal, with VTC at full advance)
Intake Opens: 20° BTDC
Intake Closes: 60° ABDC
Exhaust Opens: 55° BBDC
Exhaust Closes: 15° ATDC
The fuel system employs a returnless electronic
multi-point fuel injection design with sequential injection timing. A single
in-tank electric fuel pump delivers fuel through a stainless steel fuel rail
mounted to the intake manifold. The system operates at a nominal pressure
regulated by a pressure regulator integrated with the fuel pump module. Each
cylinder is served by a side-feed injector positioned to direct fuel spray onto
the back of the intake valves, promoting atomization and mixture preparation.
The engine management system uses mass airflow and dual heated oxygen sensors
(upstream and downstream of the catalytic converter) to maintain closed-loop
fuel control under most operating conditions. The intake manifold is a composite
construction with variable-length runners controlled by a dual-stage intake
manifold system that alters effective runner length based on engine speed and
load.
Injectors: Side-feed, high-impedance; flow rate of 290-320 cc/min at 350 kPa.
Fuel Filtration: In-tank primary strainer and replaceable inline filter rated at
10 microns.
Fuel Pressure: 330-370 kPa (48-54 psi) at idle; maintained by returnless system.
Fuel Specification: Premium unleaded 95 RON minimum for full performance;
regular unleaded 91 RON permissible with reduced ignition timing.
The lubrication system utilizes a gear-type oil pump
mounted within the front timing cover and driven directly by the crankshaft. The
pump draws oil from a baffled steel sump through a strainer screen and delivers
it to a full-flow disposable cartridge oil filter mounted on the cylinder block.
An integral oil cooler, using engine coolant, maintains oil temperature under
sustained high-load operation common in off-road and towing applications.
The system incorporates a pressure relief valve calibrated to maintain stable
pressure across the operating range. Main galleries distribute oil to the
crankshaft main bearings, connecting rod bearings, camshaft bearings, and the
VTC control mechanism. The hydraulic circuit for the VTC system includes a
dedicated oil control valve that advances or retards the intake camshaft timing
based on commands from the engine control unit.
Oil Pump Type: Gear-type, crankshaft-driven.
Oil Pressure (hot, at 3,000 rpm): 350-450 kPa (51-65 psi).
Oil Pressure (hot, idle): 70 kPa (10 psi) minimum.
Oil Capacity (with filter, standard sump): 7.5 L (7.9 US qt).
Oil Specification: API SN or higher; ILSAC GF-5; SAE 5W-30 for most climates;
SAE 10W-40 for sustained high ambient temperatures above 30 °C (86 °F) or heavy
towing applications.
The cooling system employs a belt-driven centrifugal
water pump mounted to the front of the engine block. Coolant flows from the
radiator through the pump, then through the cylinder block water jacket, upward
into the cylinder head, and returns to the radiator through a thermostat housing
located at the front of the intake manifold. A wax-pellet thermostat with a
bypass circuit maintains operating temperature stability.
The system incorporates a cross-flow aluminum radiator with a pressure-type
filler cap rated at 108-127 kPa (16-18 psi). A separate heater circuit draws
coolant from the cylinder head through the heater core and returns to the water
pump inlet. The cooling system is designed to maintain consistent cylinder head
temperatures to support the VTC mechanism’s reliable operation across varying
load conditions.
Water Pump Type: Belt-driven centrifugal pump with cast aluminum housing and
stamped steel impeller. Coolant Capacity (engine and radiator): 12.0-13.0 L
(12.7-13.7 US qt) depending on heater core and oil cooler configuration.
Thermostat Opening Temperature: 82C (180F). Thermostat Fully Open Temperature:
95C (203F). Coolant Specification: Ethylene-glycol based with
aluminum-compatible corrosion inhibitors; 50% concentration.
| Intake and Exhaust Systems |
Intake System: The intake system employs a dual-stage
variable induction manifold. At low engine speeds, a control valve in the intake
plenum lengthens the effective intake runner to promote low-end torque through
inertial charging. At approximately 4,500 rpm, the valve opens to shorten the
runner length, optimizing volumetric efficiency for high-speed operation. A
paper-element air cleaner housing with an integrated mass airflow sensor
provides filtered air to the electronically controlled throttle body. The
throttle body features an 80 mm (3.15 in) bore diameter with an electric stepper
motor for idle air control.
Exhaust System: Cast iron exhaust manifolds with equal-length runners merge into
a dual-pipe system leading to a main catalytic converter and underfloor muffler.
The exhaust manifolds are designed with expansion joints to accommodate thermal
cycling without inducing cylinder head stress. The system incorporates a heated
oxygen sensor upstream of the catalytic converter and a downstream sensor for
catalyst efficiency monitoring.
| Ignition and Electrical System |
Ignition System: Direct ignition system with individual
coil-on-plug units mounted to each cylinder head, eliminating spark plug wires.
The engine control unit provides individual cylinder timing control with dual
knock sensors (one per cylinder bank) to maintain optimal ignition advance
across varying fuel qualities and operating conditions.
Electrical System: 12 V negative-ground electrical architecture. Starter motor
is a reduction-gear type with 2.0 kW output mounted to the transmission
bellhousing. Alternator output is 110 A or 130 A depending on vehicle
specification. Engine control unit is a Nissan-designed unit with integrated
knock control, sequential fuel injection, and VTC management.
VTC System: The Variable Timing Control system operates
on the intake camshaft only. The system continuously adjusts intake valve timing
between 0° and 35° of advance relative to the crankshaft position, controlled by
oil pressure acting on a vane-type actuator at the front of the intake camshaft.
The engine control unit determines optimal timing based on engine speed, load,
and coolant temperature to balance power delivery, fuel efficiency, and
emissions.
Length (front of accessory drive to rear of flywheel
housing): 860 mm (33.9 in).
Width (overall, across valve covers): 720 mm (28.3 in).
Height (from oil pan rail to top of intake manifold): 780 mm (30.7 in).
Dry Weight (complete engine with flywheel, without accessories): 280 kg (617
lb).
Dry Weight (complete engine with alternator, starter, and manifolds): 295 kg
(650 lb).
Engine Oil: API SN or ILSAC GF-5; SAE 5W-30 for general
use.
Engine Oil: SAE 10W-40 for ambient temperatures consistently above 30C (86F).
Oil Change Interval: 5,000 km (3,100 mi) for severe service.
Oil Change Interval: 10,000 km (6,200 mi) for normal highway operation.
Oil Filter Replacement: Every oil change; use OEM or equivalent high-efficiency
filter.
Coolant Capacity: 12.0-13.0 L (12.7-13.7 US qt).
Coolant Change Interval: 60,000 km (37,000 mi) or 48 months.
Fuel Filter Replacement: 40,000 km (25,000 mi).
Air Filter Replacement: 30,000 km (18,600 mi).
Timing Chain: Inspection recommended if engine exhibits timing correlation
faults.
Valve Clearance Inspection: 100,000 km (62,000 mi).
Spark Plugs: NGK IFR6D10 or Denso VKH20 (iridium); gap: 1.0-1.1 mm (0.039-0.043
in).
Spark Plug Gap: 1.0-1.1 mm (0.039-0.043 in).
Spark Plug Replacement Interval: 100,000 km (62,000 mi) for iridium type.
Idle Speed (closed throttle, transmission in neutral): 650-750 rpm.
Drive Belt Tension: Automatic tensioner; no manual adjustment required.
VTC System Inspection: Activation confirmed by engine control unit; audible
change in intake note under acceleration indicates engagement.
Cylinder Head Bolts (M12), Stage 1: 30 Nm (22 lb-ft)
Cylinder Head Bolts (M12), Stage 2: 60 Nm (44 lb-ft)
Cylinder Head Bolts (M12), Stage 3: 90 Nm (66 lb-ft)
Main Bearing Cap Bolts (M14), Stage 1: 50 Nm (37 lb-ft)
Main Bearing Cap Bolts (M14), Stage 2: 100 Nm (74 lb-ft)
Connecting Rod Cap Bolts (M10), Stage 1: 25 Nm (18 lb-ft)
Connecting Rod Cap Bolts (M10), Stage 2: 50 Nm (37 lb-ft)
Flywheel / Flexplate Bolts (M12): 100-110 Nm (74-81 lb-ft)
Camshaft Bearing Caps (M8): 20-25 Nm (15-18 lb-ft)
Camshaft Sprocket Bolts (M10): 80-90 Nm (59-66 lb-ft)
VTC Actuator Bolt (M14): 120-130 Nm (89-96 lb-ft)
Intake Manifold Bolts (M8): 20-25 Nm (15-18 lb-ft)
Exhaust Manifold Bolts (M10): 45-50 Nm (33-37 lb-ft)
Valve Cover Bolts (M6): 8-10 Nm (6-7 lb-ft)
Oil Pan Bolts (M8): 12-15 Nm (9-11 lb-ft)
Water Pump Bolts (M8): 20-25 Nm (15-18 lb-ft)
Thermostat Housing Bolts (M8): 20-25 Nm (15-18 lb-ft)
Spark Plugs: 25-30 Nm (18-22 lb-ft)
Engine Mount Bracket to Block (M12): 70-80 Nm (52-59 lb-ft)
Crankshaft Pulley Bolt (M18): 350-400 Nm (258-295 lb-ft)
Alternator Mounting Bolts (M10): 40-45 Nm (30-33 lb-ft)
Starter Motor Mounting Bolts (M10): 40-45 Nm (30-33 lb-ft)
Oil Filter Housing to Block (M10): 40-45 Nm (30-33 lb-ft)
Knock Sensor Bolts (M6): 20-22 Nm (15-16 lb-ft)
Nissan Patrol (GU / Y61): 2001-present; continued
production for Middle Eastern markets (United Arab Emirates, Saudi Arabia,
Kuwait, Qatar, Oman, Bahrain) with the TB48DE as the premium gasoline engine
option.
Nissan Safari (Y61): 2001-2007; Japanese Domestic Market variant of the Patrol,
fitted with the TB48DE in top-grade specifications.
Nissan Civilian: Selected medium-duty bus applications where the TB48DE was
specified for gasoline-powered variants in markets with diesel restrictions.
Nissan Urvan / Caravan: Heavy-duty van variants in specific export markets
utilizing the TB48DE for high-GVM applications.
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