Determining maximum allowable reworking dimension
- Insert valve and press it firmly against valve seat.
Note. If the valve is to be replaced as part of a repair, use a new valve for the calculation.
Scheme 558
- Measure distance - a - between end of valve stem and upper cylinder head surface with a depth gauge.
- Calculate maximum allowable reworking dimension from measured distance and minimum dimension.
| Minimum dimension | |||
|---|---|---|---|
| Short intake valve | Long intake valve | Short exhaust valve | Long exhaust valve |
| 32.2 mm | 10.6 mm | 32.2 mm | 10.6 mm |
Measured distance minus minimum dimension = max. permissible reworking dimension.
| Example for long intake valve | |||
|---|---|---|---|
| Measured distance | 10.8 mm | ||
| Minimum dimension | 10.4 mm | ||
| = | Max. permissible reworking dimension | = 0.4 mm | |
Note. If the maximum allowed reworking dimension is 0 mm or less than 0 mm, repeat the measurement using new valve. If the measurement result is still 0 mm or less than 0 mm, replace the cylinder head.
Scheme 559
a - diameter 32.6 mm
b - Max. permissible reworking dimension
c - 0.9 to 1.5 mm
d - max. diameter 35.0 mm
r2 - Radius 2.0 mm
Z - Cylinder head lower edge
α - 45 valve seat angle
β - 30 upper correction angle
gamma - 60 lower correction angle
Note. Calculating the maximum allowable reworking dimension, --> Determining maximum allowable reworking dimension .