Perform a careful visual inspection of the valve guide.
To determine wear, measure valve to valve guide clearance in the “x” and “y” di-
rections (at right angles to each other) using a suitably positioned dial gauge.
Intake valve: normal clearance: 0.008 - 0.035 mm
Service limit: 0.05 mm (0.0019 in.).
Exhaust valve: normal clearance: 0.018 - 0.045 mm
Service limit: 0.08 mm (0.0031 in.).
Valve guide replacement
Make sure that the cylinder head is not damaged.
Heat up the head in a furnace at 170 °C for 30 minutes.
Remove the valve guide from the cylinder head using a suitable punch.
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