Some heads have replaceable guides and you just drive them out with the head off. Others need to be machined to have inserts installed.
By using an air compressor to hold the valves shut, while you work on them. Each spark plug is removed and an adapter is used to screw into the plug location. This adapter is then connected to compressed air. Talk to may reputable mechanic and he can help you.The above answer is right WHEN replacing the VALVE SEALS. But the question was about replacing the valve guides. YOU MUST remove the heads and take them to a machine shop to have the valve guides replaced. NO OTHER WAY.
If it blows blue smoke when starting up, that is usually the valve guides need replacing. If it constantly blows blue smoke, you are looking at piston rings. Either way oil is getting into the combustion chamber. If it's valve guides, you need to have the heads looked at, if it is rings, the bottom of the engine needs to come out.
CAUTION: Some models are equipped with anti-theft-radio make sure you have the activation code before disconnecting battery * Disconnect negative battery cable * Detach the accelerator cable from the cable guides on the valve cover (It's not necessary to remove the cable guides unless you're replacing the valve cover) * Disconnect the PCV and breather hoses from the valve cover * Remove the spark plug wire cover bolts remove the cover and then remove the spark plug wires * Remove the bolts that attach the upper timing belt cover to the valve cover * Remove the valve cover bolts and then remove the valve cover
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