Dis-assembly of valves

Dis-assembly of valves

1. Interpose tool N° 1.820.207.000 between the cylinder head and the support stand.

1. Using tools N° 1.821.001.000 (A.3.0103), N° 1.821.058.000 (A.3.0324) and N° 1.821.205.000 remove the valve stem half cones.
2. Remove the upper plate.
3. Remove the outer spring.
4. Remove the inner spring.
5. Raise the head from tool N° 1.820.207.000 and retrieve the valve.
6. Using tool N° 1.821.208.000 remove the oil seal cap.

When refitting use tool N° 1.821.206.000 to insert the oil seal caps.

1. Remove the spring contact ring.
2. Remove the lower plate.

CHECKS AND INSPECTIONS FOR CYLINDER HEADS

Checking the lower surface of cylinder heads

1. Check that the lower plane of the cylinder heads is level: if the lower plane is excessively worn, reface both heads.

Checking the clearance between valve guides and stems

1. Measure the diameter of the valve stems and check that they are within the specified limits.

1. Measure the inside diameter of the valve guides and check that they are within the specified limits.