Checking the valves for tightness
Precondition
- Cylinder head and camshaft removed
Preliminary work
- Refer to REMOVING THE CYLINDER HEAD .
- Refer to REMOVING THE CAMSHAFTS .
WARNING:
Working on fuel system.
Risk of fire! Danger of explosion!
Risk of fire! Danger of explosion!
- When working on the fuel system, make sure the workstation has sufficient ventilation, e.g., by means of extraction.
- Tightly seal off open lines and connections; collect any leakage fuel directly at the point of exit.
- No fire, sparks, open flames or smoking.
WARNING:
Contact with hazardous fluids.
Hazardous to health!
Hazardous to health!
- Note and follow safety instructions on containers.
- Conduct all work in appropriate personal protective equipment only.
- Coat all intake valves with fuel in area (1) on the cylinder head.
- Coat all exhaust valves with fuel in area (1) on the cylinder head.
Check
- Does fuel escape from valves (1) and (2) on the cylinder head?
Result
» No fuel escapes from the valves or valve seats.
Measure
- Continue the repair with the next step.
Result
» Fuel escapes from the valves or valve seats.
Measure
- Clean valves, countersink and replace if necessary.