Due to the complexity of the work and the need to use special tools and equipment, it is recommended that repairs to valves, seats and guide bushings be performed at a car service center.
It is advisable to perform only the preparatory work yourself (removal and disassembly of the cylinder head(s), flushing and checking the condition, reassembly and delivery to the car service).
See the source on the internet resource [www.ToyotaMan.ru]
Valves — Checking and Repairing [Toyota 4Runner N120]
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