Introduction to the Citroen TU3F2K Engine
The Citroen TU3F2K is a 1.4-liter, inline-4 gasoline engine that was produced by the French automaker Citroen from 1998 to 2006. This engine was used in various Citroen models, including the Saxo, Xsara, and C3. The TU3F2K is part of the TU engine family, which was introduced in 1986 and underwent several updates and improvements over the years.
Key Features of the Citroen TU3F2K Engine
- Displacement: 1,360 cc (83.0 cu in)
- Bore × Stroke: 75.0 mm × 77.0 mm (2.95 in × 3.03 in)
- Compression Ratio: 10.2:1
- Valvetrain: SOHC, 8 valves
- Fuel System: Multi-point fuel injection
- Power Output: 75 PS (55 kW; 74 hp) at 5,500 rpm
- Torque Output: 120 N⋅m (89 lb⋅ft) at 3,400 rpm
TU3F2K Engine Block and Cylinder Head
The Citroen TU3F2K engine features a cast-iron block with aluminum alloy cylinder head. The block is designed to provide excellent durability and heat dissipation, while the lightweight cylinder head contributes to the engine’s overall efficiency.
Cylinder Block Specifications
| Specification | Value |
|---|---|
| Material | Cast Iron |
| Bore Diameter | 75.0 mm (2.95 in) |
| Deck Height | 201.5 mm (7.93 in) |
| Main Bearing Caps | 4-bolt, forged steel |
Cylinder Head Specifications
| Specification | Value |
|---|---|
| Material | Aluminum Alloy |
| Valve Configuration | SOHC, 8 valves |
| Combustion Chamber Design | Wedge-shaped |
| Valve Angle | 20 degrees |
Crankshaft, Pistons, and Connecting Rods
The TU3F2K engine uses a forged steel crankshaft, aluminum alloy pistons with graphite-coated skirts, and forged steel connecting rods. These components are designed to withstand the stresses of high-speed operation while minimizing friction and wear.
Crankshaft Specifications
| Specification | Value |
|---|---|
| Material | Forged Steel |
| Main Journal Diameter | 48.0 mm (1.89 in) |
| Rod Journal Diameter | 42.0 mm (1.65 in) |
| Stroke | 77.0 mm (3.03 in) |
Piston Specifications
| Specification | Value |
|---|---|
| Material | Aluminum Alloy |
| Skirt Coating | Graphite |
| Compression Height | 29.5 mm (1.16 in) |
| Piston Pin Diameter | 20.0 mm (0.79 in) |
Connecting Rod Specifications
| Specification | Value |
|---|---|
| Material | Forged Steel |
| Length (Center-to-Center) | 133.0 mm (5.24 in) |
| Big End Bearing Type | Tri-metal, Removable |
Valvetrain and Camshaft
The Citroen TU3F2K engine employs a single overhead camshaft (SOHC) valvetrain with 8 valves (2 valves per cylinder). The camshaft is driven by a timing belt, which also drives the water pump and oil pump.
Camshaft Specifications
| Specification | Value |
|---|---|
| Material | Chilled Cast Iron |
| Drive Type | Timing Belt |
| Bearing Type | Aluminum Alloy, Removable |
| Intake Valve Lift | 8.2 mm (0.32 in) |
| Exhaust Valve Lift | 8.2 mm (0.32 in) |
Valve Specifications
| Specification | Intake | Exhaust |
|---|---|---|
| Head Diameter | 33.0 mm (1.30 in) | 29.0 mm (1.14 in) |
| Stem Diameter | 6.0 mm (0.24 in) | 6.0 mm (0.24 in) |
| Valve Spring Type | Coil, Single | Coil, Single |
Fuel System and Ignition
The TU3F2K engine uses a multi-point fuel injection system, which delivers fuel to each cylinder through individual injectors. The ignition system features a distributorless ignition with individual ignition coils for each spark plug.
Fuel System Components
- Fuel Injectors: 4, top-feed, 190 cc/min flow rate
- Fuel Pressure Regulator: 3.0 bar (43.5 psi)
- Throttle Body: 55 mm (2.17 in) diameter, electronically controlled
Ignition System Components
- Ignition Coils: 4, pencil-type, mounted on spark plugs
- Spark Plugs: NGK BKR6E-11, 1.0 mm (0.039 in) gap
- Ignition Timing: 10 degrees BTDC at idle, electronically controlled
Lubrication and Cooling Systems
The Citroen TU3F2K engine features a pressure-fed lubrication system with a gear-type oil pump driven by the crankshaft. The cooling system is a liquid-cooled design with a centrifugal water pump driven by the timing belt.
Lubrication System Specifications
| Specification | Value |
|---|---|
| Oil Pump Type | Gear |
| Oil Pressure (at idle) | 1.0 bar (14.5 psi) |
| Oil Pressure (at 3,000 rpm) | 4.0 bar (58.0 psi) |
| Oil Capacity (with filter) | 3.5 liters (3.7 US qt) |
Cooling System Specifications
| Specification | Value |
|---|---|
| Coolant Capacity | 5.0 liters (5.3 US qt) |
| Thermostat Opening Temperature | 88°C (190°F) |
| Radiator Cap Pressure | 1.4 bar (20.3 psi) |
Conclusion
The Citroen TU3F2K engine is a reliable and efficient powerplant that served various Citroen models from 1998 to 2006. With its robust design, multi-point fuel injection, and advanced ignition system, the TU3F2K provided a balance of performance and fuel economy for compact vehicles.
Frequently Asked Questions (FAQ)
1. What is the recommended oil viscosity for the Citroen TU3F2K engine?
The recommended oil viscosity for the TU3F2K engine is 5W-30 or 10W-40, depending on the ambient temperature conditions. Always refer to the owner’s manual for the most accurate information.
2. How often should the timing belt be replaced on the TU3F2K engine?
Citroen recommends replacing the timing belt on the TU3F2K engine every 120,000 km (75,000 miles) or 10 years, whichever comes first. It is crucial to adhere to this maintenance schedule to prevent potential engine damage.
3. What is the firing order of the Citroen TU3F2K engine?
The firing order of the TU3F2K engine is 1-3-4-2.
4. Can I use aftermarket parts when servicing my TU3F2K engine?
While aftermarket parts may be available for the TU3F2K engine, it is recommended to use genuine Citroen or OEM-equivalent parts to ensure optimal performance and longevity.
5. What are some common issues with the Citroen TU3F2K engine?
Some common issues reported by owners of vehicles with the TU3F2K engine include:
– Timing belt tensioner failure
– Oil leaks from the valve cover gasket or oil pan gasket
– Idle air control valve (IACV) malfunction
– Exhaust gas recirculation (EGR) valve clogging
Regular maintenance and prompt attention to any warning signs can help prevent or mitigate these issues.
