Valve seat processing

1. Insert the valve and press it firmly against the seat.

2. Measure the distance between the end of the valve stem and the top edge of the cylinder head (pic. 6.29).



3. Calculate the maximum allowable lapping distance.

Minimum intake valve distance: 35.8mm.
Minimum distance for exhaust valve: 36.1 mm.

4. Measured distance - minimum distance = maximum allowable lapping distance. For example, measured distance 36.5 mm - minimum distance 35.8 mm = maximum allowable lapping distance 0.7 mm.

Engines AEY, AFN, ANV, AHU, AKW, ALE

The inlet valve seat angles are shown in fig. 6.30, exhaust valve - in fig. 6.31.





Inlet valve seat angles

• Diameter a: 35.7 mm.
• Diameter b: 1.6 mm.
• 45°- Valve seat angle.

Exhaust valve seat angles

• Diameter a: 31.4 mm.
• Diameter b: 2.7 mm.
• 45°- Valve seat angle.

Engine 1Y

The valve seat angles are shown in fig. 6.32.

Valve seat angles