Page 35 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 2.2: Perform compression test

Objectives

At the end of this exercise you shall be able to
• install compression gauge
• test engine compression in different stages
• conclude the results.

Requirements

Tools/Materials
• A diesel vehicle in running condition • Oil can
• Compression gauge with necessary adopters • Trainees tool kit.
• Engine oil

Introduction

The engine’s compression is The results of condition Tested by the compression gauge. Compression gauge in
different stage tell us the of the engine and with this we can decide whether the engine needs reconditioning or
not.
Procedure

• Place the vehicle in a level ground .
• Apply hand brake.
• Switch oft engine.
• Open the bonnet.
• Identify the fuel pump relay and remove it.
• Run the engine till it stops. This action releases the fuel
pressure.
• Remove the air filter assembly.
• Remove the injector connections from the common rail.
• Remove the injectors from all cylinders.
• Select correct size adopter and fit with the compression
gauge.
• Install Compression gauge in first cylinder where injector fitted.
• Hold it properly.
• Crank the engine.
• Press the accelerator pedal fully.
• Observe needle the reading a the reading the engine for few seconds and allow the engine to crank till the
compression gauge needle stalls.
• Stop cranking the engine.
• Note down the maximum reading obtained.
• The reading obtained during dry test is ___ kg/cm²
• Remove the compression gauge.
• Put few drops of oil in to the engine cylinder.
• Install gauge again compression gauge.
• Crank the engine and note down the readings.
• The reading obtained during wet test is ______ kg/cm²
• Do the same procedure for all cylinder.
• Conclude the condition of the engine from the readings obtained.

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