Daewoo Nubira User Manual page 415

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