Daewoo CIELO EURO III Manual

DAEWOO T-154 BL2,3

SECTION 1

ENGINE

 CIELO EURO III

SECTION 1A

GENERAL ENGINE INFORMATION

TABLE OF CONTENTS

Diagnosis

1A-1

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Compression Test

1A-1

. . . . . . . . . . . . . . . . . . . . . . . . . 

Oil Pressure Test

1A-2

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Oil Leak Diagnosis

1A-3

. . . . . . . . . . . . . . . . . . . . . . . . 

Knock Diagnosis

1A-4

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Noise Diagnosis

1A-8

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General Information

1A-11

. . . . . . . . . . . . . . . . . . . . . . . 

Cleanliness and Care

1A-11

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On-Engine Service

1A-11

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DIAGNOSIS

COMPRESSION TEST

Important:

  Disconnect the Crankshaft Position (CKP)

Sensor connector to disable the fuel and the ignition

systems.

Test the compression pressure for each cylinder. Low

compression pressure may be the fault of the valves or

the pistons. The following conditions should be consid-

ered when you check the cylinder compression:

D

The engine should be at normal operating tempera-

ture.

D

The throttle must be wide open.

D

All the spark plugs should be removed.

D

The battery must be at or near full charge.

1. Place approximately three squirts of oil from a plung-

er-type oiler into each spark plug port.

2. Insert the engine compression gauge into each spark

plug port.

3. Crank test each cylinder with four to five compression

strokes using the starter motor.

4. The lowest reading should not be less than 70% of

the highest reading. The compression gauge reading

should not be less than 689 kPa (100 psi) for any of

the cylinders.

5. Examine the gauge readings obtained after the four

‘‘puffs’’ per cylinder are obtained from cranking the

starter motor. The readings are explained in the follow-

ing descriptions:

D

Normal Condition – Compression builds up quickly

and evenly to the specified compression on each cylin-

der.

D

Piston Rings Faulty – Compression is low on the first

stroke and tends to build up on following strokes, but

the compression pressure does not reach normal. The

compression pressure improves considerably with the

addition of oil into the cylinder.

D

Valves Faulty – Low compression pressure on the

first stroke. The compression pressure does not tend

to build up on the following strokes. The compression

pressure does not improve much with the addition of

oil into the cylinder.