Chevrolet 12617048 Valve, Exhaust

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Due to the intricate nature of the task and the specific tools and equipment required, a professional should handle the servicing of the valves, valve seats, and valve guides, also known as a valve job. A home mechanic can remove and disassemble the head, perform the initial cleaning and inspection, then reassemble and deliver it to a dealer service department or an automotive machine shop for the actual service work. This inspection allows the mechanic to understand the condition of the head and valvetrain components and to know what work and new parts are needed when dealing with an automotive machine shop. The dealer service department or automotive machine shop will then remove the valves and springs, recondition or replace the valves and valve seats, recondition the valve guides, check and replace the valve springs, rotators, spring retainers and keepers as necessary, replace the valve seals with new ones, reassemble the valve components and ensure the installed spring height is correct. The cylinder head gasket surface will also be resurfaced if it's warped. After the valve job has been performed by a professional, the head will be in like new condition. When the head is returned, it should be cleaned again before installation on the engine to remove any metal particles and abrasive grit that may still be present from the valve service or head resurfacing operations. Compressed air should be used, if available, to blow out all the oil holes and passages.