GMC 10144172 Valve Assembly, Exhaust

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Because of the need to perform extensive work on the valves, valve seats and valve guides, often referred to as the 'valve job', it is advisable to seek the services of a professional technician since the job calls for proper alignment and use of some specific tools and equipment. A home mechanic can take off the head, scrape, clean as well as assess the valves, then reinstall the head and bring or take the head to a dealer service department or an automotive machine shop for the real servicing of the valves. Some of the duties of the dealer service department or the automotive machine shop will include the removal of the valves and the springs, the reconditioning and or replacement of the valves and valve seats, the inspection, reconditioning, and replacement of the valve guides, the checking and replacement of the valve springs, the spring retainers, the keepers as may be deemed necessary, the replacement of the valve seals with new ones and the reassembly of If the surface of the cylinder head gasket is twisted then it is also refinished. After the valve job is accomplished by the professional the head will be in good condition as if it was when it was new. On its return it should be again washed to remove all the particles of metal and other abrasive materials which could be left following the valve service or the process of milling or facing of the head and if possible all the oil holes and passages should be blown with air.

Before installing the head back on the engine, it is important to clean the head again to eliminate any metal particles and abrasive grit that may remain from the valve service or head resurfacing operations.

They will remove the valves and springs, recondition or replace the valves and valve seats, recondition the valve guides, check and replace the valve springs, spring retainers, and keepers as necessary, replace the valve seals, reassemble the valve components, and ensure the installed spring height is correct. If the cylinder head gasket surface is warped, it will also be resurfaced.

The cylinder head gasket surface may also be resurfaced if it's warped.

The dealer service department or automotive machine shop will remove the valves and springs, recondition or replace the valves and valve seats, recondition the valve guides, check and replace the valve springs, spring retainers or rotators and keepers as needed, replace the valve seals with new ones, reassemble the valve components and ensure the installed spring height is correct.

Once the valve job is completed by a professional, the head will be in like-new condition.

A "valve job" refers to the servicing of the valves, valve seats, and valve guides in an engine.