JTD engines: operating characteristics

JTD engines: operating characteristics

JTD is a series of diesel engines equipped with a common rail direct injection system, produced by Fiat Chrysler Automobiles. They are installed on Fiat, Lancia, and Alfa Romeo vehicles. Chrysler, Jeep, Maserati, RAM, and some other cars are also equipped with them. They have been produced since 1997. They were the first to have a common rail direct injection system – a collaborative development of Fiat and Bosch. Some JTD engines were developed in cooperation with General Motors. All of them are equipped with turbochargers, often twin or variable-geometry ones . They are characterised by high output, reliability, and fuel economy.

Popular JTD engines

Engine code Version name Capacity, L Number and arrangement of cylinders Number of valves Output, hp Max engine torque, N·m Production start Model applications
182 B4.000; 182 B9.000; 186 A8.000; 192 A3.000; 182 B9.000;223 B2.000;937 A2.000; 186 A6.000; AR 32302; 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 16 70–105 170 2003 Fiat Punto; Fiat Albea; Fiat Panda; Lancia Ypsilon; Fiat Idea; Fiat FiorinoAlfa Romeo MiTo; Fiat Palio; Fiat 500; Fiat Doblò; 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 16 105–120 290–320 2006 Alfa Romeo Mito; Fiat Bravo; Alfa Romeo Giulietta; Fiat 500L; Fiat Grande Punto; Fiat Doblò; 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 16 110–195 260–380 2008 Lancia Delta; Alfa Romeo 159; Fiat Doblò; Fiat Bravo; Fiat Freemont; Alfa Romeo Giulietta; Fiat Sedici; Fiat Ducato; Alfa Romeo 159; Fiat Croma
839 A5.000; 185 A6.000; AR 32501; 839 A6.000; AR 34202. Unijet 2.4 5, in-line 10 136–150   1997 Fiat Marea; Fiat Marea Weekend
841 N.000; 841 M.000; 841 G.000; 841 H.000; 939 A3.000. Multijet 2.4 5, in-line 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

Common malfunctions of JTD engines

MalfunctionsEngines
In versions with a plastic intake manifold, the swirl flaps can tear off and damage the engine if they fall into the combustion chambers.1.9 MultiJet 16v; 2.4 MultiJet 20v.
If the oil isn’t changed in time, the fuel injectors can quickly become clogged. They don’t last long after cleaning.1.9 MultiJet.
Oil burns out fast, which can cause the timing chain to skip.1.3 MultiJet.
The timing chain has a short lifespan. Rockers get damaged if it breaks.1.3 MultiJet.
The ECU malfunctions in the freezing cold, making it impossible to start the engine.1.3 MultiJet.
Coolant starts leaking from under the thermostat, which can lead to engine overheating. In some versions, the thermostat itself is prone to crack.1.3 MultiJet; 1.6 MultiJet; 2.0 Multijet II.