Daewoo Nubira User Manual page 418

1A – 10IGENERAL ENGINE INFORMATION
Step
1 Is a light tapping sound heard from the engine?
2 Inspect the valve springs.
Are the springs weak or broken?
3 Inspect the valves.
Are the valves sticking or warped?
4 Inspect the valve lifters.
Are the valve lifters dirty, stuck or worn?
5 Inspect the camshaft lobes.
Are the camshaft lobes damaged or improperly ma-
chined?
6 Check the oil supply to the valve train.
Is the oil supply insufficient or poor?
7 Inspect the valve guides.
Are the valve guides worn?
8 Inspect the valve spring seat.
Is the valve spring seat incorrect?
Valve Mechanism or Valve Train Noises
Action Value(s) Yes
Go to Step 2
Go toCylinder
Head and
Valve Train
Components
Replacement
Procedure
Go toCylinder
Head and
Valve Train
Components
Replacement
Procedure
Go toCylinder
Head and
Valve Train
Components
Replacement
Procedure
Go toCamshaft
Replacement
Procedure
Go toCylinder
Head and
Valve Train
Components
Replacement
Procedure
Go toCylinder
Head and
Valve Train
Components
Replacement
Procedure
Go toCylinder
Head and
Valve Train
Components
Replacement
Procedure
No
System OK
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 6
Go to Step 7
Go to Step 8
System OK
DAEWOO V–121 BL4