Page 306 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 17.2: Servicing of CRDI High pressure fuel

supply circuit

Objectives
At the end of this exercise you shall be able to
• remove and refit of high pressure pipe and high pressure pump
• remove and refit common rail and fuel pressure sensor
• checking of fuel pressure regulator
• remove and refit crdi fuel injector
• checking of fuel injector leak.
• checking of high pressure fuel circuit.

Requirements

Tools/Equipments Materials
• Trainee’s toolkit - 1 No. • Tray - as reqd.
• Multi meter - 1 No. • Cottoncloth - as reqd.
• Kerosene - as reqd.
Equipments • Fuel pipe line and Hoses - as reqd.
• Scan tool - 1 No. • Diesel - as reqd.
• A LMV with CRDI engine - 1 No.

Procedure

TASK 1: Removal and Refitting of High pressure pipes
1 Open the vehicle bonnet.

2 Locate and identify the fuel pump relay of the vehicle.
3 Remove the Fuel pump relay and Run the engine till the engine stops.
4 Connect the scan tool to data link connector with ignition switched off.
5 Turn ON the Ignition switch. Confirm the fuel pressure line is not under pressure using the scan tool current
data.
6 Switch off Ignition and disconnect scan tool.
7 Disconnect the battery negative cable.
8 Remove the engine cover.

9 Disconnect the fuel feed hose of high pressure pump and fuel return line to the fuel tank.
10 Loosen the union nuts of high pressure pipes of HP pump to common rail and common rail to CRDI injectors

Note: Wrap a cotton cloth around high pressure union joints while removing the high pressure pipes

11 Check the high pressure pipes for any crack or damage. Replace if necessary.
12 Tighten the high pressure pipe as specified in the service manual.

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CITS : Automotive - Mechanic Diesel - Exercise 17.1