Daewoo CIELO EURO III Manual page 8

1A – 8 GENERAL ENGINE INFORMATION
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Step
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Are dull thuds or knocks heard with every engine
1
revolution?
Check the oil pump pressure.
2
Is the oil pump pressure low?
Inspect the crankshaft end play.
Does the crankshaft end play exceed the specified
3
value?
Inspect the crankshaft journals.
Are the crankshaft journals out-of-round?
4
Inspect the belt tension.
Does the belt tension exceed the specified value?
5
Inspect the crankshaft pulley.
Is the crankshaft pulley loose?
6
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Step
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1 Is a knock noise heard under all engine speeds?
Inspect the crankshaft connecting rod journal.
Is the crankshaft connecting rod journal worn?
2
Check the oil pump pressure.
3
Is the oil pump pressure low?
Inspect the crankshaft connecting rod journals.
Are the journals out of round?
4
Inspect the connecting rods.
Is there a misaligned connecting rod?
5
Inspect the connecting rod bolts.
Are the connecting rod bolts torqued properly?
6
NOISE DIAGNOSIS
Main Bearing Noise
Action
Connecting Rod Bearing Noise Symptom
Action
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Value(s) Yes
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– Go to Step 2
Go to Oil
– Pressure Test
Go to
Crankshaft
0.1 mm Replacement
(0.0039 in.) Procedure
Go to
0.004 mm Crankshaft
(0.0002 in.) Replacement
max. Procedure
Go to
Timing Belt
– Replacement
Procedure
Go to
Crankshaft
– Replacement
Procedure
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Value(s) Yes
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– Go to Step 2
Go to
Crankshaft
– Replacement
Procedure
Go to
– Oil Pressure
Test
Go to
Crankshaft
– Replacement
Procedure
Go to Pistons
and Rods
– Replacement
Procedure
–
System OK
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No
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System OK
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 6
System OK
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No
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System OK
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 6
Go to Pistons
and Rods
Replacement
Procedure
DAEWOO T-154 BL2,3