Fig. 2.147. Measuring the valve seat width
Measure the width of the valve seat contact surface. If necessary, machine the valve seat or plate using the appropriate device (fig. 2.147).
Standard width: 1.2–1.6 mm.
Fig. 2.148. Methods of processing the valve seat with a cutting tool
Check the centering of the contact surface relative to the valve seat (fig. 2.148).
If the contact surface is offset outward, machine the valve seat with a cutting tool with a working angle of 70° (Inlet) or 65° (Exhaust) and a cutting tool with an angle of 45°.
If the contact surface is offset inward, machine the valve seat with a cutting tool with a working angle of 30° (Inlet) or 0° (Exhaust) and a cutting tool with an angle of 45°.
Fig. 2.149. Measuring valve seat protrusion
Check the valve seat depth. Measure the protrusion (L dimension) of the valve stem (fig. 2.149).
(The article is copied from the resource: «www.MazBook.ru»)
If the measured height is not within the standard, replace the cylinder head.
Standard size L:
- Intake: 40.64–42.24 mm;
- Issue: 40.50–42.10 mm.