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Overhauling the cylinder head components
Overhauling the heads
Remove any carbon deposits from the combustion chamber and its ducts.
Check for cracking and inspect the sealing surfaces for scoring, steps or other damage.
Make sure the coupling surface with the cylinder must be perfectly flat. If this is not the case, spread
diamond lapping paste (6 ÷ 12 micron thickness) on a reference surface and slide the cylinder head with
circular movements on the surface until a flat surface is obtained.
Checking the valves
Check that the stem and the valve seat contact surface are in good condition.
There must be no pitting, cracks, deformations or signs of wear.
Warning
The valves cannot be ground.
Perform the following checks: measure the diameter of the valve stem at various points along the section
that runs in the valve guide.
Check the valve stem for buckling. Place the valve on a "V" reference block, set a dial gauge perpendicular
to head and measure concentricity of valve face at 45°:
- Service level: 0.03 mm
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