2. Measure the distance «A» between the end of the valve stem and the top edge of the cylinder head (pic. 7.25).
3. Calculate the maximum allowable lapping distance.
- Minimum intake valve distance: 35.8mm.
- Minimum distance for exhaust valve: 36.1 mm.
4. Measured distance - minimum distance = maximum allowable lapping distance. For example, Measured distance 36.5 mm - minimum distance 35.8 mm = maximum allowable lapping distance 0.7 mm.
The inlet valve seat angles are shown in fig. 7.26, exhaust valve - in fig. 7.27.
Inlet valve seat angles
- Diameter a: 35.7 mm.
- Diameter b: 1.6 mm.
- 45°- Valve seat angle.
- 30°- Correction angle.
Exhaust valve seat angles
- Diameter a: 31.4 mm.
- Diameter b: 2.7 mm.
- 45°- Valve seat angle.
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