A valve job is the colloquial term for resurfacing the mating surfaces of the poppet valves and their respective valve seats that control the intake and exhaust of the air/fuel mixture in four stroke internal combustion engine, replacing valve oil seals, replacing any deficient valve springs, and otherwise bringing the components of a cylinder head up to manufacturer’s spec.[1] A resurfacing of the head’s meeting surface with the engine block to true it is often done at the same time if a head has been removed from the engine.
Some reasons that may induce the need for a valve job in a modern passenger car include: excessive RPM, high mileage, overheating, material failure, corrosion, and foreign object damage (FOD).
^Gilles, Tim (2019-01-17). Automotive Service: Inspection, Maintenance, Repair. Cengage Learning. ISBN 978-1-337-79413-8.
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