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https://www.donationalerts.com/r/andr... channel. In this video I will pull out the nozzle cup in the head of the YaMZ engine. I will show you what keys are needed, you can make them yourself at home. • How to easily and simply change the guide ... replacing bushings • How to process the exhaust seat ... go through the reamers • How to grind the valve on the engine head ... grind the valve