- Install valve and press it firmly onto the valve seat. NOTE: If you intend to replace the valve, use new valve for measurement.
- Install valve and press firmly against valve seat.
- Measure distance between end of valve stem and top surface of cylinder head.
- Calculate maximum permissible refacing dimension from measured distance and minimum dimension.
| Outer intake valve | Center intake valve | Exhaust valve |
|---|---|---|
| 34.0 mm (1.338 in.) | 33.7 mm (1.326 in.) | 34.4 mm (1.354 in.) |
MINIMUM DIMENSIONS
The measured distance minus the minimum dimension equals the maximum permissible refacing dimension.
| Outer intake valve | |
|---|---|
| Measured dimension | 34.4 mm (1.354 in.) |
| Minimum dimension | 34.0mm (1.338 in.) |
| Maximum permissible refacing | = 0.4 mm (0.0157 in.) |
MAXIMUM PERMISSIBLE REFACING DIMENSION (EXAMPLE)
Note. If the measured distance is less than the minimum dimension, repeat the measurement with new valves or replace the cylinder head.
Scheme 170
- Valve seats, refacing
| Intake valve seat |
|---|
| A = 26.2 mm (1.0314 in.) diameter |
| B = 1.5 to 1.8 mm (0.059 to 0.070) |
| Z = Lower cylinder head surface |
| Alpha = 45° Valve seat angle |
| Beta = 30° Upper correction angle |
| Gama = 60° Lower correction angle |
| Exhaust valve seat |
| A = 29.0 mm (1.114 in.) diameter |
| B = approx. 1.8 mm (0.070) |
| Z = Lower cylinder head surface |
| Alpha = 45° Valve seat angle |
| Beta = 30° Upper correction angle |
| Gama = 60° Lower correction angle |
VALVE SEAT SPECIFICATIONS