Checking and Inspecting Cylinder Head

1. Check that the embedding of the valves from the surface of the cylinder head is within the specified limits by measuring using tool no. 1.820.503.000 complete with dial gauge.

If the embedding of the valves from the cylinder head surface is not within the specified limits, grind the valve seats again.

Checking and Inspecting Cylinder Head

Checking the Cylinder Head Lower Surface

• Remove all traces of the old seal from the lower surface of the cylinder head.
• Check that the flatness of the cylinder head lower surface is within the specified limits.

1. If the flatness of the cylinder head lower surface is not within the specified limits, grind the cylinder head lower surface without exceeding the minimum permissible height.

Checking the Valves

• Check that the valves have no signs of scoring or seizing.
• Check that the valve stem diameter is within the specified limits; if not, replace the worn valves.

Checking the Cups

• Check that the outside diameter of the cups is within the specified limits; if not, replace the worn parts.

• Check that the diameter of the cup seats is within the specified limits; if not, replace the cylinder head.

Checking Valve Springs

• Check that the free length of the springs is within the specified limits.