GENERAL ENGINE INFORMATION 1A – 7
DAEWOO V–121 BL4
Knocks at Idle Hot
Step Action Value(s) Yes No
1 Does the engine knock at idle when hot? Go to Step 2 System OK
2 Inspect the drive belts.
Are the belts loose or worn?
Go to Step 3 Go to Step 4
3 Tension or replace the belts as necessary.
Is the repair complete?
Go to Step 1
4 Inspect the A/C compressor and the generator.
Is either the compressor or the generator faulty?
Go to Step 5 Go to Step 6
5 Replace the faulty A/C compressor or the generator.
Is the repair complete?
Go to Step 1
6 Inspect the valve train.
Are valve train components faulty?
Go to Step 7 Go to Step 8
7 Replace the faulty valve train components.
Is the repair complete?
Go to Step 1
8 Check the engine oil.
Is the proper viscosity oil used in the crankcase?
Go to Step 10 Go to Step 9
9 Install oil of the proper viscosity for the expected
seasonal temperatures.
Is the repair complete?
Go to Step 1
10 Inspect the piston pin clearance.
Is the clearance more than the specified value?
2.0L DOHC
0.014 mm
(0.0005 in.)
Go to Step 11 Go to Step 12
11 Replace the piston and the pin.
Is the repair complete?
Go to Step 1
12 Check the connecting rod alignment.
Is the alignment faulty?
Go to Step 13 Go to Step 14
13 Check and replace rods as necessary.
Is the repair complete?
Go to Step 1
14 Inspect the piston–to–bore clearance.
Is the clearance within the specified value?
0.03 mm
(0.0012 in.)
Go to Step 16 Go to Step 15
15 Hone the bore and fit a new piston.
Is the repair complete?
Go to Step 1
16 Inspect the crankshaft balancer.
Is the balancer loose?
Go to Step 17 Go to Step 18
17 Torque or replace worn parts.
Is the repair complete?
Go to Step 1
18 Check the piston pin offset.
Is the offset at the specified value?
0.5–0.7 mm
(0.019–0.027
in.)
Toward Thrust
Side
Go to Step 19 System OK
19 Install the correct piston.
Is the repair complete?
Go to Step 1
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