Fiat Doblo 1.3 Multijet Van Problems | Resolved

Fiat Doblo 1.3 Multijet Van Problems

CURRENT DEVELOPMENTS
These engines are fitted with ”Magneti Marelli Common Rail’ high pressure electronic injection systems for fast diesel engines totally managed by a Multijet MJD 6JF electronic control unit.

PERFORMANCE
This engine is able to provide the following performance: maximum power 51 KW CEE at 4000 rpm, maximum torque 180 Nm EC at 2000 rpm.

DEVICES ADOPTED
These engines are fitted with the following emissions control devices: exhaust system with oxidising catalytic converter,  E.G.R. exhaust gas recirculation system with heat exchanger,  crankcase vapour/gas recirculation system.

STRUCTURE
The unit comprises the engine and all the systems required for its operation: fuel system,  air turbocharging system,  engine cooling system,  exhaust system with catalytic converter,  oil vapour recirculation system,  E.G.R. exhaust gas recirculation system with heat exchanger,  The operation of these systems is optimized by an electronic control system governed by a control unit.

An understanding of the operating logic of the control unit gives an overall picture of the entire GROUP 10 system Characteristic of working principle 1060 DIESEL FUEL INJECTION.

CONSTRUCTION
Direct injection turbodiesel engine without precombustion chamber, 4 cylinders in line, 1248 c.c., four valves per cylinder with hydraulic tappets, two overhead camshafts with geared power transmission, supercharged with variable geometry turbocharger and intercooler, Magneti Marelli MJD 6JF Common Rail electronic fuel injection system.


The Power Unit

Fiat Doblo 1.3 Multijet Van Problems

The power unit mounting is the ‘suspended’ type.

The unit is fixed to the bodyshell by means of three supports with flexible damping mountings: one in steel on the timing side (1), one in aluminium alloy on the gearbox side (2), one swivelling type in steel (3), which is fastened to the suspension crossmember
To limit jolting, the engine is connected to the bodywork at the top by means of a counterbrace (4).


Fiat Doblo 1.3 Multijet Turbo Problems

Fiat Doblo 1.3 Multijet Turbo Problems

BORG WARNER TURBOCHARGER
The turbocharger (1) is connected to the exhaust manifold its purpose is to increase the volumetric output of the engine. It basically consists of two impellers fitted on the same shaft, which rotates on two floating bearings which are lubricated by means of a branch (3) off the engine lubrication system.

  1. Turbocharger
  2. Waste gate
  3. Lubrication circuit branch
  4. Pneumatic actuator

The oil used disperses some of the large amount of heat which is given off by the exhaust gases at the turbine. There is a waste-gate valve (2) fitted on the turbocharger, controlled by a pneumatic actuator (5), which allows the passage of exhaust gases to the turbine to be choked depending on the pressure reached at the compressor outlet.


If you want more information on the Fiat Doblo consider downloading the Fiat Doblo 1.3 Multijet workshop manual. Hundreds of pages of detailed illustrations, text and troubleshooting to get your Fiat back up and running.