GMC 12601762 Exhaust Valve

Because of the strenuous and technical work involved with the procedure and the required specific tools and equipments, valve job involves servicing of the valves, valve seats and valve guides using the interpersonal skills and know how which is recommend for professional mechanics. Some of the operations that may be performed in an automotive machine shop include the removal of the valves and springs, reconditioning or replacement of the valves and valve seats, reconditioning of the valve guides, checking, and replacement of valve springs, spring retainers, rotators and keepers if necessary; replacement of the valve seals with new ones, assembly of the valve components, for the proper installed height of the spring. Also, the cylinder head gasket surface will be machined if it is warped, while certain cylinder heads will have a minimum height of machining; anything beyond that height will require replacement. After the valve job is done, head should be almost as good as new, and before it can be bolted on to the engine, it is always important to clean it up again, to remove all the tiniest of metal particles and abrasive grit which could be left behind by the valve service or even the head resurface . It is quite possible to use compressed air for blowing all desired oil holes, bolt holes and cooling jackets.