the mechanic`s hand unscrews the screw in the engine with a socket wrench. unscrewing valve tappets

automotive black block car carbon clutch combustion cove cover deposit deposits dirty disassemble disassembles disc element engine gloves hand hands holds inside interior internal mechanic mechanics nagar old parts pressure pushers repair rust screw screws sediment service shaft shows socket spare spin suit tappets unscrew unscrewing unscrews valve valves work workshop worn wrench