Valve Seat, Cut Opel Vivaro A

1. 1. Seat angle • A = 89.5° – Inlet and exhaust
2. 2. Seat width • B = 1.8 mm – Inlet and exhaust
3. 3. External seat diameter • D = Inlet 36.975 ± 0.008 mm • D = Exhaust 33.597 ± 0.008 mm

Important. Support cylinder head safely

4. 4. Insert cutting tool into valve guide and position cutter on valve seat • Rotate cutter using light pressure to achieve a minimal removal of material
5. 5. Cut seat B to required angle A, then cut seat C, as required, to obtain dimensions for B
6. 6. Coat valve seat with fine grinding paste and insert valve in guide • Rotate valve 60°, using thumb pressure
7. 7. Remove valve and check valve seat contact pattern, if valve does not fit perfectly, re-cut seat slightly again • Clean valve and cylinder head
8. 8. Grind-in valve, see operation "Valve, Grind-in"