Caution! Replace the valves one at a time. Do not mix the components. each valve must be inserted into its seat, which is marked prior to removal.
Caution!
- The seat (1) on the valve head cannot be reground. if required, replace the valve.
- Grinding with abrasive paste is allowed; valve stem end regrinding is not allowed.
Clean off any combustion residues from the valves.
Check the seat (1) on the valve head with a ruler flush.
The surface of the seat must not be concave; replace the valve if necessary.
Check the clearance between the stem and the valve guide:
- inlet: 0.013 - 0.040 mm (0.00051 - 0.00157 in);
- limit: 0.080 mm (0.00315 in)
- outlet: 0.025 - 0.052 mm (0.00098 - 0.00205 in);
- limit: 0.100 mm (0.00394 in)
Check the valve eccentricity:
- valve stem (3) maximum eccentricity allowed: 0.05 mm (0.00197 in)
- valve head (4) maximum eccentricity allowed: 0.05 mm (0.00197 in)
Check that the fixing grooves (5) of the valve cotters are in proper conditions.
Valve springs
Carry out a measurement and a visual inspection of the valve springs for damage, distortion or loss of tension.
Measure the spring length at release position.
- Valve springs: minimum wear limit (6) 42.5 mm (1.673 in).
- Valve springs: minimum wear limit (7) 38 mm (1.496 in).