Undo the bolts (1 a) and remove the water pump (1b).
Remove the gasket.
Fit a wooden stand on the cylinder head plane to support the
valves and secure it using bolts.
Fit the cotters (1 a) using the tools (1b lever) and (1c chamber)
Remove the valve upper shim.
Remove the valve spring.
Remove the shim (for exhaust valves only)
Remove the valve guide oil seal with integrated lower valve shim.
Carry out the same operations on the other valves.
Remove the wooden stand and recover the valves.
Remove the lower cylinder head from the support tool.
Replace the valve guide.
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