- Insert valve and press firmly against valve seat.
Note. If a valve has to be replaced as part of a repair, use the new valve for the measurement.
Scheme 184
- Measure distance -a- between end of valve stem and upper cylinder head surface with a depth gauge.
- Calculate maximum permissible machining dimension using measured distance and minimum dimension.
| Minimum dimension | ||||
|---|---|---|---|---|
| Short intake valve | Long intake valve | Short exhaust valve | Long exhaust valve | |
| 31.8 mm | 10.2 mm | 31.8 mm | 10.2 mm | |
Distance measured minus minimum dimension = maximum permissible machining dimension.
| Example for outer intake valve | |||
|---|---|---|---|
| Distance measured | 10.6 mm | ||
| Minimum dimension | 10.2 mm | ||
| = | Maximum allowable machining dimension | = 0.4 mm | |
Note. If the maximum allowed machining 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 185
Note. Calculating maximum permissible machining dimension. Refer to Calculating maximum permissible machining dimension .
| Dimension | Intake valve seat | ||
|---|---|---|---|
| A | = | Diameter 30.6 mm | |
| B | = | Maximum permissible machining dimension | |
| C | = | 0.9...1.5 mm | |
| D | = | Max. diameter 35.0 mm | |
| R2 | = | Radius 2.0 mm | |
| Z | = | Bottom surface of cylinder head | |
| Α | = | 45° valve seat angle | |
| Β | = | 30° upper correction angle | |
| Gamma | = | 60° lower correction angle | |