The 1.7-liter diesel engine Hyundai D4FD or 1.7 CRDi was produced from 2010 to 2019 and was installed on such popular concern models as ix35, i40, Optima, Tucson and Sportage. There are two modifications of such a unit: for environmentally friendly Euro 5 standards and updated for Euro 6..
In 2010, the largest representative of the U2 diesel family with a volume of 1.7 liters appeared. It was a classic for that time diesel engine with a cast-iron cylinder block, an aluminum 16-valve DOHC head with hydraulic lifters and a timing chain drive. The injection was carried out by a CR Bosch fuel system with a maximum pressure of up to 1800 bar, a turbocharger with a Garrett GTB1244VZ geometry change system was responsible for the boost, the intake manifold was equipped with swirl flaps, and a number of versions had a start-stop system. There were two modifications: 116 hp and 260 Nm or 136 hp and 320 Nm, both supported Euro 5.
In 2015, diesel engines of the U2 family were updated to more stringent Euro 6 economy standards. These units can be identified by a reduced compression ratio, it was reduced from 17.0 to 15.7. The power of both versions of the engine grew, they began to develop: 116 hp and 280 Nm or 141 hp and 340 Nm.
The Hyundai U series also includes engines: D3FA, D4FA, D4FB, D4FC and D4FE.
The engine was installed on:
- Hyundai i40 1 (VF) in 2011 – 2018;
- Hyundai ix35 1 (LM) in 2010 – 2015;
- Hyundai Sonata 7 (LF) in 2015 – 2019;
- Hyundai Tucson 3 (TL) in 2015 – 2018;
- Kia Optima 3 (TF) in 2012 – 2015; Optima 4 (JF) in 2015 – 2018;
- Kia Sportage 3 (SL) in 2010 – 2016; Sportage 4 (QL) in 2015 – 2018;
- Kia Carens 4 (RP) in 2013 – 2018.
Specifications
| Production years | 2010-2019 |
| Displacement, cc | 1685 |
| Fuel system | Common Rail |
| Power output, hp | 116 – 136 (EURO 5 versions) 116 – 141 (EURO 6 versions) |
| Torque output, Nm | 260 – 330 (EURO 5 versions) 280 – 340 (EURO 6 versions) |
| Cylinder block | cast iron R4 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 77.2 |
| Piston stroke, mm | 90 |
| Compression ratio | 17.0 (EURO 5 versions) 15.7 (EURO 6 versions) |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Turbocharging | yes |
| Recommended engine oil | 0W-30, 5W-30 |
| Engine oil capacity, liter | 5.7 |
| Fuel type | diesel |
| Euro standards | EURO 5 EURO 6 |
| Fuel consumption, L/100 km (for Hyundai i40 2014) — city — highway — combined |
7.8 5.0 6.0 |
| Engine lifespan, km | ~350 000 |
| Weight, kg | 167.7 |
Disadvantages of the Hyundai D4FD engine
- The main problems for the owner are the rapid contamination of the intake manifold, equipped with swirl flaps. It has to be cleaned every 50,000 km. The damper actuator regularly flies off the hinges and they simply stop working.
- The CR Bosch fuel system of this power unit is highly reliable, but only if you don’t pour anything into the tank, and this is especially true for Euro 6 diesel engines. Often they only complain about the failure of the fuel pressure regulator and booster pump.
- All versions of this engine are equipped with a particulate filter and it can be a hassle. An increase in the level of lubrication indicates a failure in its regeneration, which means it has already become clogged. Quite often, fuel can enter the oil due to a leaky fuel pump seal.
- For all U-series diesels, timing chains do not differ in resource and stretch to 100,000 km, but for a 1.7-liter engine they go longer and usually change them to 200,000 km. It is worth noting that with a strong stretch, the chain can jump and the valves will bend.
- Of the other complaints on specialized forums, only relatively frequent lubricant leaks are worth noting. Also here it is necessary to regularly clean the EGR valve and throttle flap.
