Page 118 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 5.7: Overhauling and testing the fuel injector

Objectives

At the end of this exercise you shall be able to
• dismantle the injectors
• inspect and assemble injector
• testing injectors.

Requirements

Tools/Instruments
• Trainee’s tool kit - 1 No. • Air compressor - 1 No.
• Injector cleaning kit - 1 No.
Materials/Components
Equipments/Machines • Kerosene - as reqd.
• Multicylinder diesel engine - 1 No. • Diesel - as reqd.
• Injector testing machine - 1 No. • Soap oil - as reqd.
• Cleaning cloth - as reqd.
• injector - as reqd.
Procedure

TASK 1: Dismantling (Fig 1)
1 Remove overflow line of injectors.
Fig 1
2 Remove high pressure lines. Ensure that the pipes do not bend.
3 Remove injector clamp.

4 Remove the injectors from cylinder head
5 Plug the inlet (injector seating) and leak-off openings.
6 Clean the nozzle tip and wipe off the dirt from the injectors.
7 Hold the injector in inverted position.
8 Unscrew nozzle cap nut (1) and remove the cap nut (Fig 1).

9 Remove nozzle (2), intermediate washer (3), pressure bolt (4), spring (5)
and shims (6).

TASK 2: Cleaning and inspection (Fig 1)
1 Keep the components in the respective compartments of a standard work tray.
2 Rinse nozzle in clean diesel and withdraw nozzle needle from the nozzle body.
3 Inspect the nozzle needle for damage, roughness and wear.

4 Inspect the nozzle body (7) for damage.

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