Daewoo NUBIRA - Valve Mechanism or Valve Train Noises

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