JTD is a range of diesel engines from Fiat Chrysler Automobiles equipped with a common rail direct injection system. They are installed in Fiat, Lancia and Alfa Romeo vehicles. In addition, Chrysler, Jeep, Maserati, RAM and other cars are equipped with it. They have been in production since 1997. They were the first with a common rail direct injection system – a joint development by Fiat and Bosch. Some JTD engines were co-developed with General Motors. These all have twin or variable geometry turbochargers. These engines are characterized by high performance, reliability and economical consumption.
Popular JTD-Engines
| Index | Type | Displacement, L | Number and arrangement of cylinders | Number of valves | Power, hp | Max. Torque, Nm | Year of manufacture | Applicable models |
| 182 B4,000; 182 B9,000; 186 A8,000; 192 A3,000; 182 B9,000; 223 B2,000; 937 A2,000; 186 A6,000; AR32302; 188 A7,000; 937 A7.000. | Unijet; From 2002, MultiJet | 1.9 | 4, in-line | 8 | 80-140 | 195 –280 | 1997 | Alfa Romeo 146; Fiat Brava; Alfa Romeo 156; Fiat Punto; Alfa Romeo 145; Alfa Romeo 147; Fiat Bravo; Fiat Stilo; Lancia Lybra; Fiat Croma; Fiat Doblo; Fiat Sedici; Lancia Delta |
| 192 A5.000; 937 A5,000; 937 A4,000; 192 B1,000; 186 A9.000. | MultiJet | 1.9 | 4, in-line | 16 | 140– 190 | 305‒400 | 2002 | Fiat Doblo; Fiat Croma; Alfa Romeo GT; Alfa Romeo 147; Alfa Romeo 156 |
| 188 A9,000; 199 A2,000; 188 A8,000; 199 B2,000; 223 A9,000; 199 B8,000; 199 B4,000; 199 A3.000. | MultiJet | 1.3 | 4, in-line engine | 16 | 70-105 | 170 | 2003 | Fiat Punto; Fiat Albea; Fiat Panda; Lancia Upsilon; Fiat Idea; Fiat Fiorino Alfa Romeo MiTo; Fiat Palio; Fiat 500; Fiat Doblo; Fiat Qubo; Fiat Tipo; Lancia Musa |
| 955 A3.000; 350 A3,000; 844 A3,000; 350 A2,000; 198 A6,000; 198 A3,000; 955 A4,000; 198 A2.000. | Multijet | 1.6 | 4, in-line engine | 16 | 105 –120 | 290-320 | 2006 | Alfa Romeo Mito; Fiat Bravo; Alfa Romeo Giulietta; Fiat 500L; Fiat Grande Punto; Fiat Doblo; Fiat Linea; Fiat Idea; Fiat Tipo |
| 844 A2.000; 198 A8,000; 55263087; 198 A5,000; 250 A2,000; 263 A1,000; 55263088; 250 A1,000; 939 B4,000; 940 B5,000; 939 B4,000; 940 A7.000. | Multijet II | 2.0 | 4, in-line engine | 16 | 110 –195 | 260–380 | 2008 | Lancia Delta; Alfa Romeo 159; Fiat Doblo; Fiat Bravo; Fiat Freemont; Alfa Romeo Giulietta; Fiat Sedici; Fiat Ducato; Alfa Romeo 159; Fiat Croma |
| 839 A5.000; 185 A6,000; AR32501; 839 A6,000; AR 34202. | Unijet | 2.4 | 5, in-line | 10 | 136-150 | 1997 | Fiat Marea; Fiat Marea Weekend | |
| 841 N.000; 841M,000; 841G.000; 841 H.000; 939 A3.000. | Multijet | 2.4 | 5, in-line engine | 20 | 175– 210 | 385–400 | 2003 | Alfa Romeo 156 Alfa Romeo 166; Fiat Croma; Alfa Romeo 156 Sportwagon |
| F1AE0481D; F1AE0481N; F1AE0481C; F1AE3481E; F1AE6481D. | Multijet | 2.3 | 4, in-line | 16 | 110–148 | 270–380 | 2006 | Fiat Ducato |
Frequent defects of JTD-Motoren
| Defects | Motoren |
| On versions with a plastic intake manifold, the tumble flaps can break off and damage the engine if they get into the combustion chambers. | 1.9 MultiJet 16v; 2.4 MultiJet 20v. |
| The injectors can quickly become clogged if the oil is not changed in good time. They don't last long after cleaning. | 1.9 MultiJet. |
| The oil burns out quickly, which can cause the timing chain to misfire. | 1.3 MultiJet. |
| The timing chain doesn't last long. The rocker arms will suffer damage if it breaks. | 1.3 MultiJet. |
| The engine control unit malfunctions at minus temperatures and prevents the engine from starting. | 1.3 MultiJet. |
| Coolant leaking under the thermostat can cause the engine to overheat. The thermostat itself is prone to cracking in certain versions. | 1.3 MultiJet; 1.6 MultiJet; 2.0 Multijet II. |