Valve seat repair
A valve seat not producing a uniform contact with its valve or showing width of seating contact that is out of specified range must be repaired by regrinding or by cutting and regrinding and finished by lapping.
- Exhaust valve seat:
Use valve seat cutters (1) to make two cuts as illustrated in the figure. Two cutters must be used: the first for making 15° angle, and the second for making 45° angle. The second cut must be made to produce desired seat width.
Seat width for exhaust valve seat
- 1.1 - 1.3 mm (0.0433 - 0.0512 in.)
- Intake valve seat:
Use valve seat cutters (1) to make three cuts as illustrated in the figure. Three cutters must be used: the 1st for 15° angle, the 2nd for making 60° angle, and 3rd for making 45° angle. The 3rd cut (45°) must be made to produce desired seat width.
Seat width for intake valve seat
- 1.1 - 1.3 mm (0.0433 - 0.0512 in.)
- Valve lapping:
Lap valve on seat in two steps, first with coarse size lapping compound applied to face and the second with fine-size compound, each time using valve lapper according to usual lapping method.