Valve Seat - Cut
Courtesy of GENERAL MOTORS CORP.
- Place the cylinder head on wooden blocks.
- Cut the intake and exhaust valve seats using the KM-340-7 included in the KM-340-1-C
as follows:
- Valve seat: A 44.5-45 degree side (b) using the KM-340-13 included in the KM-340-1-C
- Upper correction angle: A 30 degree side (a) using the KM-340-13 included in the KM-340-1-C
- Lower correction angle: A 60 degree side (c) using the KM-340-26 included in the KM-340-1-C
- Clean the chippings from the cylinder head.
- Inspect the dimensions to make sure the valve seat width is as follows:
- Intake: 1.17-1.57 mm (0.046-0.062 in)
- Exhaust: 1.4-1.8 mm (0.055-0.071 in)
- Inspect the assembly height of the intake valves and the exhaust valves.
- If the dimension is exceeded, install new valves.
- Inspect the assembly height of the intake valves and the exhaust valves again.
- If the valve assembly height is still too large despite replacing the valves, replace the cylinder head.